CN105371980A - Cultural relic site temperature monitoring system and monitoring method - Google Patents
Cultural relic site temperature monitoring system and monitoring method Download PDFInfo
- Publication number
- CN105371980A CN105371980A CN201510781086.0A CN201510781086A CN105371980A CN 105371980 A CN105371980 A CN 105371980A CN 201510781086 A CN201510781086 A CN 201510781086A CN 105371980 A CN105371980 A CN 105371980A
- Authority
- CN
- China
- Prior art keywords
- temperature measuring
- optical cable
- temperature
- electric signal
- measuring optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention provides a cultural relic site temperature monitoring system, which belongs to the technical field of monitoring. The system comprises at least one temperature measuring optical cable, a sensing host and a display, wherein each temperature measuring optical cable is laid in a to-be-monitored area of the cultural relic site for generating scattering light of different powers according to the temperature of the to-be-monitored area when optical pulses are transmitted; the sensing host is arranged in a monitoring room and is connected with the temperature measuring optical cable via an optical fiber interface for receiving and extracting signal light and reference light in the scattering light inputted to the temperature measuring optical cable and carrying out photoelectric conversion on the signal light and the reference light respectively, an obtained electric signal is calculated, and a temperature value at each point in the to-be-monitored area is acquired; and the display is arranged in the monitoring room for displaying the temperature value at each point in the to-be-monitored area generated by the sensing host. Through the system disclosed by the invention, field temperature of the cultural relic site can be acquired in real time.
Description
Technical field
The application relates to monitoring technical field, particularly relates to a kind of cultural sight temperature monitoring system and monitoring method.
Background technology
Research shows, physical environment fluctuation is up to now still the main cause that cultural sight matrix suffers damage.The factor of natural environment affecting cultural sight preservation situation is a lot, such as: temperature, humidity, wind erosion, weathering, soluble salt migration, optical radiation, air pollutants, microorganism and insect activity etc., these factors are mutually intersected, are affected each other, in subtle, destroy cultural sight.Under these factor effects, constantly there is aged deterioration in cultural sight material, and move towards gradually to disappear, thus form the serious threat of cultural sight being preserved to the life-span.In these factors, the natural cause of the most often having an effect is air themperature and the humidity of cultural sight place environment, and they are two pacing itemss determining all physics, chemistry, biological agent.
In the past few years, some archaeology scholars are pointed out by a large amount of researching and analysing, and temperature affects the important environmental factor that cultural sight preserves the life-span.Temperature embodies both ways for the impact of cultural sight, and one is that temperature produces direct destruction.The acute variation of temperature causes producing differences in expansion between cultural sight matrix constituent, and effect year in year out easily causes basal body structure to loosen; Two be temperature change produce collateral damage.The change of air themperature can cause the change of air humidity, thus causes the migration of moisture in cultural sight matrix, and then causes the migration of salinity in matrix, aggravation cultural sight salt damage.
Preserving the life-span to extend cultural sight better, needing the data of the temperature factor gathered in environment residing for cultural sight, carry out comprehensive, deep, systematic research.Thermal infrared imager is more commonly used to gather the temperature of cultural sight place environment in prior art.Because the region that thermal infrared imager is taken is limited at every turn, when using the temperature of infrared heat image instrument measuring cultural sight, need the mode of taking to fix a point to take one by one, be fixed up using the position of thermal infrared imager by shooting personnel, lay timber as mark in each monitoring point, and then utilize thermal infrared imager anchor point collecting temperature one by one.
Visible, thermal infrared imager is used at least to there is following defect to the method that cultural sight temperature gathers in prior art: to need tester to operate at the scene, every year can only the temperature of taken at regular intervals cultural sight several times, cannot the temperature of Real-time Obtaining cultural sight.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of cultural sight temperature monitoring system and monitoring method; Real-Time Monitoring can be carried out for the temperature factor of cultural sight place environment; for a long time, the temperature of cultural sight is detected all sidedly; thus for cultural sight protection provide fully, science, effective data, play the effect of protection cultural sight.
In order to solve the problem, this application discloses a kind of cultural sight temperature monitoring system, comprise: at least one temperature measuring optical cable, sensing main frame and display, wherein, described temperature measuring optical cable, be laid in the region to be monitored of described cultural sight, for producing the scattered light of different capacity when transmission light pulse according to the temperature in described region to be monitored; Described sensing main frame is arranged in Control Room, be connected with described temperature measuring optical cable by optical fiber interface, for receiving and the flashlight extracted in the scattered light of described temperature measuring optical cable input and reference light, respectively opto-electronic conversion is carried out to described flashlight and reference light, then the electric signal obtained is calculated, obtain the temperature value of described region to be monitored each point; Display is arranged in Control Room, for showing the temperature value of the region described to be monitored each point that described sensing main frame generates.
Preferably, described system also comprises: be arranged on the supporting network above described cultural sight, and described temperature measuring optical cable is fixed on described supporting network.Described temperature measuring optical cable is that pectination is fixed on described supporting network and/or described temperature measuring optical cable is fixed on described supporting network after ring.
In another embodiment of the application, described system also comprises: alarm module, for when the temperature value that described sensing Framework computing obtains described region to be monitored exceedes preset value, receives the alarm command that described sensing main frame sends, sends alerting signal.
Further, described sensing main frame comprises further: light source, light wavelength division multiplexing, demarcation optical fiber, platinum resistor temperature measuring module, photoelectric detection module, acquisition module and signal processing module.Wherein,
Described light source, for launching original optical pulse;
Described light wavelength division multiplexing, original optical pulse for being launched by described light source inputs described demarcation optical fiber, and successively along described demarcation optical fiber and the transmission of described temperature measuring optical cable, and gathering the scattered light produced along described temperature measuring optical cable and described demarcation optical fiber, described scattered light comprises: flashlight and reference light;
Probe and the described demarcation optical fiber of described platinum resistor temperature measuring module are fixed together, and for measuring the temperature of described demarcation optical fiber, and send to signal processing module;
Described photoelectric detection module, converts electric signal to respectively for the described flashlight that exported by described light wavelength division multiplexing and described reference light;
Described acquisition module, for gathering electric signal corresponding to flashlight that described photoelectric detection module exports and electric signal corresponding to reference light, extract the electric signal that electric signal corresponding to the flashlight of described demarcation fibre scattering and electric signal corresponding to reference light, the electric signal corresponding to flashlight of described temperature measuring optical cable scattering and reference light are corresponding respectively;
Described signal processing module, the position of the temperature of this sampled point that temperature measuring optical cable is measured described in the electric signal that the flashlight of a certain sampled point of the electric signal corresponding for the flashlight of the described demarcation optical fiber exported according to the temperature value of described demarcation optical fiber and described acquisition module and electric signal corresponding to reference light, described temperature measuring optical cable is corresponding and electric signal demodulation corresponding to reference light and described temperature measuring optical cable corresponding to this sampled point.
Further, in temperature measuring optical cable measurement described in demodulation, the formula of the temperature of a certain sampled point is:
Wherein, T1 is the temperature of a certain sampled point in temperature measuring optical cable, and T0 is the temperature of demarcating optical fiber, R
1(T
1) be the flashlight of temperature measuring optical cable and the ratio of reference light power, R
0(T
0) for demarcating the flashlight of optical fiber and the ratio of reference light power, h is Planck's constant, and Δ ν is the vibration frequency 13.2THz of optical fiber phonon, and K is Boltzmann constant.
Further, the position of the described temperature measuring optical cable that a certain sampled point is corresponding in temperature measuring optical cable described in demodulation, specifically comprise: according to the distance calculated the sampling rate of electric signal between each sampled point, sampling sequence number and the product of the distance between described each sampled point of current sampling point are the position in described temperature measuring optical cable corresponding to described current sampling point.
Accordingly, the embodiment of the present application also discloses a kind of cultural sight temperature monitoring method, adopt aforesaid cultural sight temperature monitoring system, described method comprises: the scattered light that the temperature measuring optical cable that collection is laid in described cultural sight region to be monitored in advance produces when transmission light pulse; Extract the flashlight in the scattered light of described temperature measuring optical cable input and reference light; Opto-electronic conversion is carried out respectively to described flashlight and reference light and obtains electric signal corresponding to described flashlight and electric signal corresponding to described reference light; The electric signal corresponding according to described flashlight and electric signal corresponding to described reference light calculate, and obtain the temperature value of described region to be monitored each point; Show the temperature value of described region to be monitored each point.
Described method also comprises: above described cultural sight, arrange supporting network, is fixed on described supporting network by described temperature measuring optical cable.
Described temperature measuring optical cable is that pectination is fixed on described supporting network and/or described temperature measuring optical cable is fixed on described supporting network after ring.
Compared with prior art, the embodiment of the application is by laying temperature measuring optical cable at cultural sight scene, by temperature measuring optical cable Real-time Collection cultural sight scene temperature and feed back to the sensing main frame of pulpit, by sensing main frame, light signal is processed, convert temperature signal to further, display is sent to show, can the temperature at Real-time Collection cultural sight scene.
Accompanying drawing explanation
Fig. 1 is the cultural sight temperature monitoring system structural representation of the application;
Fig. 2 is sensing main machine structure schematic diagram in the described monitoring system of the application;
Fig. 3 is fiber cable laying mode schematic diagram in the application one specific embodiment;
Fig. 4 is the structural representation of another embodiment of cultural sight temperature monitoring system of the application;
Fig. 5 is the schematic flow sheet that the application's cultural sight temperature monitoring system carries out thermometric.
Embodiment
For enabling above-mentioned purpose, the feature and advantage of the application more become apparent, below in conjunction with the drawings and specific embodiments, the application is described in further detail.
Spontaneous Raman scattering light can be produced when original optical pulse transmits in a fiber, wherein there are two kinds of wavelength components in Backward spontaneous Raman scattering light, a kind of is the wavelength components moved down relative to original optical pulse frequency, be called stokes light, another kind is the wavelength components relative to original optical pulse frequency upper shift, be called anti-Stokes light, wherein the power of anti-Stokes light is larger by the impact of fiber optic temperature, and the power of stokes light is less by the impact of fiber optic temperature, so in this application, gather anti-Stokes light as flashlight, stokes light is as reference light, carry out the temperature detection of certain point in optical fiber.
The application judges the temperature of optical fiber by the luminous power of detection signal light and reference light, thus determines the temperature information of optical fiber place environment.
In addition, utilize optical time domain reflection technology, arrive the time of detector by tracer signal light and reference light and the time of light source luminescent pulse determines the position that spontaneous Raman scattering effect occurs, thus determine the positional information of high temperature (low temperature).
A kind of cultural sight temperature monitoring system of the application structural representation is shown with reference to Fig. 1, Fig. 1.
The cultural sight temperature monitoring system of the embodiment of the present application one comprises: at least one temperature measuring optical cable 10, sensing main frame 20 and display 30, wherein, described temperature measuring optical cable 10 is laid in the region to be monitored of cultural sight, for when transmission light pulse, the temperature according to described region to be monitored produces scattered light; Described sensing main frame 20 is arranged in Control Room, be connected with described temperature measuring optical cable 10 by optical fiber interface, for receiving and the flashlight extracted in the scattered light of described temperature measuring optical cable 10 input and reference light, respectively opto-electronic conversion is carried out to described flashlight and reference light, then the electric signal obtained is calculated, obtain the temperature value of described region to be monitored each point; Display 30 is arranged in Control Room, for showing the temperature value of the region described to be monitored each point that described sensing main frame 20 generates.
Spontaneous Raman scattering light can be produced when original optical pulse transmits in a fiber, by the impact of fiber optic temperature, the power of scattered light signal can change, the embodiment of the application is by laying temperature measuring optical cable at cultural sight scene, by the temperature at temperature measuring optical cable Real-time Collection cultural sight scene, the sensing main frame of pulpit is fed back to by the form of scattered light signal, by sensing main frame, light signal is processed, convert temperature signal to further, display is sent to show, can the temperature at Real-time Collection cultural sight scene.
As shown in Figure 2, described sensing main frame 20 comprises further: light source 201, light wavelength division multiplexing 202, demarcation optical fiber 203, platinum resistor temperature measuring module 204, photoelectric detection module 205, acquisition module 206 and signal processing module 207.Below the function of each module, structure and annexation are introduced one by one.
Light source 201 is for launching original optical pulse, and the original optical pulse that light source 201 is launched, successively through light wavelength division multiplexing 201, demarcation optical fiber 203, enters temperature measuring optical cable 10 by optical fiber interface.During concrete enforcement, the light-pulse generator that light source 201 can adopt 5V to power, its pulse width exporting pulse is 10ns, and peak power 20W is adjustable, and repetition frequency 30KHz is adjustable.
Light wavelength division multiplexing 202, the original optical pulse for being launched by described light source 201 inputs described demarcation optical fiber 203, and transmits along described demarcation optical fiber 203 and described temperature measuring optical cable 10 successively; The temperature of the diverse location of described temperature measuring optical cable 10 is different, can produce the scattered light of different capacity, transfers to described light wavelength division multiplexing 202 successively along temperature measuring optical cable, demarcation optical fiber.The light pulse of temperature measuring optical cable 10 scattering comprises by the larger pulsed light (i.e. anti-Stokes light) of the impact of fiber optic temperature, and the pulsed light (i.e. stokes light) being subject to the impact of fiber optic temperature less.The application adopts by the larger pulsed light of the impact of fiber optic temperature as flashlight, and the less pulsed light of the impact by fiber optic temperature, as with reference to light, carries out temperature survey.Described light wavelength division multiplexing 202 is also for gathering flashlight along described temperature measuring optical cable and described demarcation fibre scattering and reference light.
The probe of platinum resistor temperature measuring module 204 is fixed together with demarcation optical fiber 203, for measuring the temperature of demarcating optical fiber 203.The output of platinum resistor temperature measuring module 204 is connected with the input of signal processing module 207.During concrete enforcement, platinum resistor temperature measuring module can adopt platinum sensor.
Photoelectric detection module 205 is connected between light wavelength division multiplexing 202 and acquisition module 206, converts electric signal to send to described acquisition module 206 for the described flashlight that exported by light wavelength division multiplexing 202 and reference light.Described photoelectric detection module 205 comprises further: photoelectric commutator and signal amplifier.Photoelectric detection module 205 converts electric signal V to by demarcating the stokes light returned in optical fiber 203 and temperature measuring optical cable 10 simultaneously
s, anti-Stokes light converts electric signal V to
as, export the acquisition channel that described capture card gathers this two path signal respectively to, in capture card, complete repeatedly cumulative, average computation, output to signal processing module 207 afterwards.
Described acquisition module 206 is for electric signal corresponding to flashlight that gather described photoelectric detection module 205 and export and electric signal corresponding to reference light, extract the electric signal that electric signal corresponding to the flashlight of described demarcation optical fiber 203 scattering and electric signal corresponding to reference light, the electric signal corresponding to flashlight of described temperature measuring optical cable 10 scattering and reference light are corresponding respectively, and send to described signal processing module 207.
Described acquisition module 206 comprises capture card, and the input interface of capture card is SMA interface, and be connected with photoelectric detection module 205, output interface is pci interface, is connected with signal processing module 207.Acquisition module 206 clock control circuit, by software sets acquisition instructions, and according to acquisition instructions, automatic startup acquisition function, namely gather the electric signal that photoelectric detection module 205 exports, and regularly carry out adding up, after average computation, export signal processing module 207 to.In the present embodiment, described capture card at least has two acquisition channels, respectively the electric signal of collection signal light and the electric signal of reference light.The channel acquisition of capture card collection signal light demarcates the flashlight electric signal of optical fiber 203 scattering and the flashlight electric signal of temperature measuring optical cable 10 scattering; The channel acquisition that capture card gathers reference light demarcates the reference light electric signal of optical fiber 203 scattering and the reference light electric signal of temperature measuring optical cable 10 scattering.Demarcate any position all scattered signal light and reference lighies of optical fiber 203 and temperature measuring optical cable 10, therefore, acquisition module 206 need to add up to the electric signal gathered in a period of time, average treatment, to obtain electric signal accurately corresponding to a certain position.Such as, gather 5 recurrence intervals, the electric signal of the flashlight gathering first point in 5 recurrence intervals is carried out cumulative rear average, obtain the flashlight electric signal of first some correspondence; The electric signal of the reference light gathering first point in 5 recurrence intervals is carried out cumulative rear average, obtain the reference light electric signal of first some correspondence; The electric signal of the flashlight gathering second point in 5 recurrence intervals is carried out cumulative rear average, obtain the flashlight electric signal of second some correspondence; The electric signal of the reference light gathering second point in 5 recurrence intervals is carried out cumulative rear average, obtain the reference light electric signal of second some correspondence ..., the rest may be inferred.By adding up to electric signal corresponding to flashlight and electric signal corresponding to reference light, on average, acquisition module 206 obtains demarcating electric signal corresponding to electric signal corresponding to the flashlight of optical fiber 203 and electric signal corresponding to reference light, the electric signal corresponding to flashlight of temperature measuring optical cable 10 and reference light.
Described signal processing module 207, be connected with acquisition module 206, platinum resistor temperature measuring module 204 respectively, the temperature that described in the electric signal that the flashlight of the electric signal that the flashlight of the described demarcation optical fiber 203 exported for the temperature value of demarcation optical fiber 203 measured according to platinum resistor temperature measuring module 204 and described acquisition module 206 is corresponding and electric signal corresponding to reference light, described temperature measuring optical cable 10 is corresponding and electric signal demodulation corresponding to reference light, temperature measuring optical cable 10 is measured and position, and export to display 30.
Based on previous embodiment, in another embodiment of the application, the temperature monitoring system of described cultural sight also comprises: alarm module 40, is connected, as shown in Figure 4 with the signal processing module 207 in described sensing main frame 20.When described signal processing module 207 judges that the temperature that demodulation obtains meets or exceeds default alarm threshold value, send alarm command to described alarm module 40, described alarm module 40 starts sound and light alarm for the alarm command sent according to signal processing module, remind position, the staff's cultural sight top temperature exceeding standard of Control Room, for staff takes corresponding measure process to strive for more time and guarantee in time.Described alarm module 40 can be alarm lamp, or loudspeaker etc. can be sounded and/or the equipment of light.
In another embodiment of the application, the temperature monitoring system of described cultural sight also comprises: memory module, is connected with described signal processing module, for storing temperature and the positional information of described signal processing module demodulation acquisition, uses for scientific research.
In another embodiment of the application, the temperature monitoring system of described cultural sight also comprises: network transmission module, be connected with described signal processing module, for by the temperature of described signal processing module demodulation acquisition and positional information, upload to the server preset in real time.
During concrete enforcement, temperature measuring optical cable 10 can directly be laid in the surface of cultural sight temperature area to be measured, and the measurement data that the movement in order to avoid temperature measuring optical cable brings is inaccurate, and band can be used to be bundled on the fixed object on cultural sight surface by temperature measuring optical cable.
As shown in Figure 3, a kind of preferred temperature measuring optical cable system of laying is: above cultural sight, arrange supporting network 300, be fixed on supporting network 300 by temperature measuring optical cable 301.Described supporting network 300 can use the stronger rope of stretching resistance (as: energetically horse rope) to be woven into, and surrounding hangs weight 303 or be fixed on described cultural sight peripheral.Described temperature measuring optical cable 301 is bundled on described supporting network 300 by band.
By arranging supporting network 300 above cultural sight, cultural sight surface can not be destroyed, being more conducive to protecting cultural sight.
When laying temperature measuring optical cable, in order to carry out comprehensive monitoring to the temperature of cultural sight, the mode that " pectination " lays can be adopted, evenly be laid in temperature measuring optical cable temperature area to be measured, as 301 in Fig. 3, the mode of " optical cable is around ring " can be adopted to lay, as shown in 302 in Fig. 3 for emphasis monitored area.
The process adopting the temperature of monitoring system to cultural sight of cultural sight temperature disclosed in the present application to monitor is described in detail below in conjunction with an object lesson.
In the embodiment of the application, the wavelength of the light that light source sends is 1550 nanometers, wavelength is that the pulsed light of 1550 nanometers is when transmitting in a fiber, all can spontaneous generation Raman scattering effect in any position of optical fiber, produce the Stokes pulsed light that wavelength is 1663 nanometers, produce the anti-stoke pulsed light that wavelength is 1450 nanometers simultaneously.In the embodiment of the application, the repetition frequency of the pulsed light that light source sends is 10KHz.
As shown in Figure 5, the temperature monitoring system of the cultural sight in the application's enforcement carries out temperature survey and comprises the following steps:
Step 510, the scattered light that the temperature measuring optical cable that collection is laid in described cultural sight region to be monitored in advance produces when transmission light pulse;
Step 520, extracts the flashlight in the scattered light of described temperature measuring optical cable input and reference light;
Step 530, carries out opto-electronic conversion respectively to described flashlight and reference light and obtains electric signal corresponding to described flashlight and electric signal corresponding to described reference light;
Step 540, the electric signal corresponding according to described flashlight and electric signal corresponding to described reference light calculate, and obtain the temperature value of described region to be monitored each point;
Step 550, shows the temperature value of described region to be monitored each point.
In step 510, start light source according to after the frequency utilizing emitted light pulse preset, optical fiber is demarcated in the light pulse input that light source is launched by light wavelength division multiplexing, makes light pulse successively along the temperature measuring optical cable transmission of demarcating optical fiber and the cultural sight region to be monitored that is laid in advance.
Along with the transmission of light pulse, demarcating each position of light, temperature measuring optical cable, the scattered light transmitted dorsad can be produced.In step 520, light wavelength division multiplexing receives along temperature measuring optical cable and the scattered light demarcating Optical Fiber Transmission, and the flashlight extracted wherein and reference light input to photoelectric detection module respectively.
In step 530, photoelectric detection module carries out conversion process to the flashlight received and reference light, obtains electric signal corresponding to flashlight and electric signal corresponding to reference light respectively.
In step 540, the electric signal that acquisition module collection signal light is corresponding and electric signal corresponding to reference light, carry out respectively adding up, average treatment, obtain demarcating the electric signal that electric signal corresponding to the flashlight of optical fiber and electric signal corresponding to reference light, the electric signal corresponding to flashlight of temperature measuring optical cable and reference light are corresponding.Concrete grammar is as follows: acquisition module can gather demarcation optical fiber in each recurrence interval, the electric signal that in temperature measuring optical cable, the flashlight of each position is corresponding and electric signal corresponding to reference light, and each sampled point (diverse location of corresponding temperature measuring optical cable) is added up at the flashlight electric signal of different recurrence intervals, the reference light electric signal of each sampled point in the different recurrence intervals is added up, then, the electric signal gathered several cycle is again averaged calculating, obtain the electric signal of flashlight and the electric signal of reference light of demarcating a certain sampled point in optical fiber or temperature measuring optical cable, for the temperature value of this sampled point of demodulation.
In above-mentioned steps 540, signal processing module according to demarcate optical fiber temperature value, demarcate the temperature value that electric signal corresponding to electric signal corresponding to the flashlight of optical fiber and electric signal corresponding to reference light, the electric signal corresponding to flashlight of temperature measuring optical cable and reference light calculates a certain sampled point in temperature measuring optical cable 10; According to the distance calculated the sampling rate of electric signal between each sampled point, sampling sequence number and the product of the distance between described each sampled point of current sampling point are the position of described temperature measuring optical cable corresponding to described current sampling point.Wherein, demarcating optical fiber is the one section of temperature-measuring optical fiber be arranged in the sensing main frame in Control Room, and its temperature value can be approximately equal to room temperature, in order to accurate measurement, obtains preferably by platinum resistor temperature measuring module.The temperature of temperature measuring optical cable 10 certain any is exactly the temperature of corresponding position, region to be monitored.
In above-mentioned steps 540, signal processing module is according to the temperature value demarcating optical fiber, demarcate electric signal corresponding to the flashlight of optical fiber and electric signal corresponding to reference light, the electric signal that the flashlight of temperature measuring optical cable is corresponding and electric signal corresponding to reference light calculate the temperature value of a certain sampled point in temperature measuring optical cable, concrete grammar is as follows: the electric signal that the temperature transition of the demarcation optical fiber that signal processing module sends according to acquisition module obtains, the temperature value of the demarcation optical fiber that the measurement of platinum resistor temperature measuring module obtains, the electric signal that the temperature transition of temperature measuring optical cable sent with acquisition module obtains calculates the temperature value of temperature measuring optical cable.Wherein, the electric signal that the demarcation optical fiber of acquisition module transmission is corresponding comprises: anti-Stokes light (flashlight namely used in the application) signal V
as0with stokes light (reference light namely used in the application) signal V
s0; The electric signal that the temperature measuring optical cable that acquisition module sends is corresponding comprises: anti-Stokes light signal V
as1with Stokes light signal V
s1.Calculate the signal power ratio demarcating optical fiber respectively
with the signal power ratio of temperature measuring optical cable
according to the temperature value T demarcating the demarcation optical fiber that the signal power ratio of optical fiber, the signal power ratio of temperature measuring optical cable and the measurement of platinum resistor temperature measuring module obtain
0, calculate the temperature value T of temperature measuring optical cable
1.
Fibre scattering theory and photoelectric conversion Amplification Theory, the signal power of optical fiber is than as follows:
R
0(T
0)=Cexp [-h Δ ν/(kT
0)] formula (1);
R
1(T
1)=Cexp [-h Δ ν/(kT
1)] formula (2);
Wherein C be temperature independent, amplify relevant constant term with fibre scattering and photoelectric conversion, h is Planck's constant, and Δ ν is the vibration frequency 13.2THz of optical fiber phonon, K is Boltzmann constant.According to above-mentioned formula (1) and (2), can show that the relation of the signal power ratio demarcating optical fiber and temperature measuring optical cable can represent with formula (3):
According to formula (3), derived for solving T
1formula be:
Wherein, T
0for demarcating the temperature of optical fiber, R
1(T
1) be the flashlight of temperature measuring optical cable and the ratio of reference light power, R
0(T
0) for demarcating the flashlight of optical fiber and the ratio of reference light power, h is Planck's constant, and Δ ν is the vibration frequency 13.2THz of optical fiber phonon, and K is Boltzmann constant.
In above-mentioned steps 540, signal processing module calculates the position of described temperature measuring optical cable corresponding to this sampled point according to the sampling rate of electric signal and the sampling sequence number of this sampled point, and concrete grammar is as follows:
When laser pulse transmits in a fiber, all produce the Raman diffused light of reverse transfers in any position of optical fiber.In time domain, incident light is t through the backscattering time turned back to needed for optical fiber incidence end, and passed by the in a fiber distance of light pulse is 2L, then 2L=Vt, and wherein, v is the speed that light is propagated in a fiber.
c is the light velocity in vacuum, and n is the refractive index of optical fiber.The backscattering that measures in the t distance L from optical fiber incidence end can be calculated according to formula (4).
By measuring the time of flashlight and the reference light received, can calculate according to above-mentioned formula (4) position that the flashlight received produces Raman scattering effect in temperature measuring optical cable, i.e. the particular location in cultural sight region to be measured.
In the present embodiment, in order to convenience of calculation, not measurement time t, but adopt following methods to calculate:
According to the sampling rate of sampling card in acquisition module, determine the time interval of a collection sampled point, and calculate distance L between sampled point (i.e. scattered light transmit in the time interval between collection two sampled points distance) according to formula (4), just can calculate position in optical fiber corresponding to current sampling point according to current sampled point sequence number further.Such as: the position of the optical fiber that the scattered light of the 1st sampled point of collection is corresponding is exactly first L section from optical fiber incidence end; The position of the optical fiber that the scattered light of the 2nd sampled point gathered is corresponding is exactly second L section from optical fiber incidence end ... by that analogy.The position in optical fiber corresponding to this sampled point just can be calculated according to the distance between the sequence number of sampled point gathered and neighbouring sample point.
The sampling rate of such as capture card is 100MSa/s (sampled point/second), namely gathers 10 1 second
8the flashlight of individual point scattering and reference light, so gather the flashlight of a sampled point scattering and the time of reference light is exactly
second, so this time t is brought into formula (4) above, just can obtain fiber lengths L corresponding to the time of the scattered light of a collection sampled point.After once calculating the value of L, when calculating the position in optical fiber corresponding to each sampled point again, directly utilize being multiplied of the sequence number of sampled point and L.
In the embodiment of the application, when the temperature of the temperature measuring optical cable that demodulation obtains meets or exceeds default alarm threshold value, the temperature monitoring method of the application can also send alarm command to alarm module, starts sound and light alarm.
Temperature monitoring method disclosed in the embodiment of the application, the scattered light produced when transmission light pulse by the temperature measuring optical cable gathering the described cultural sight region to be monitored that is laid in advance; Extract the flashlight in the scattered light of described temperature measuring optical cable input and reference light; And be converted to electric signal corresponding to described flashlight and electric signal corresponding to described reference light; The electric signal corresponding according to described flashlight and electric signal corresponding to described reference light calculate, and obtain the temperature value of described region to be monitored each point, can the temperature at Real-time Collection cultural sight scene, and be conducive to comprehensively, long-term acquisition data.Do not need staff to scene, do not need to make nose pile on cultural sight surface, better can protect cultural sight.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For embodiment of the method, due to itself and system embodiment basic simlarity, so description is fairly simple, relevant part illustrates see the part of system embodiment.
System embodiment described above is only schematic, the wherein said module illustrated as separating component can or may not be physically separates, parts as module display can be or may not be physical module, namely can be positioned at a place, or also can be distributed on multiple mixed-media network modules mixed-media.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying performing creative labour, are namely appreciated that and implement.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that each embodiment can add required general hardware platform by software and realize, and can certainly pass through hardware implementing.Based on such understanding, technique scheme can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can store in a computer-readable storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment or embodiment.
Claims (10)
1. a cultural sight temperature monitoring system, is characterized in that, comprising: at least one temperature measuring optical cable, sensing main frame and display, wherein,
Described temperature measuring optical cable, the region to be monitored of the described cultural sight that is laid in, for producing the scattered light of different capacity when transmission light pulse according to the temperature in described region to be monitored;
Described sensing main frame is arranged in Control Room, be connected with described temperature measuring optical cable by optical fiber interface, for receiving and the flashlight extracted in the scattered light of described temperature measuring optical cable input and reference light, respectively opto-electronic conversion is carried out to described flashlight and reference light, then the electric signal obtained is calculated, obtain the temperature value of described region to be monitored each point;
Display is arranged in Control Room, for showing the temperature value of the region described to be monitored each point that described sensing main frame generates.
2. the system as claimed in claim 1, is characterized in that, also comprises: be arranged on the supporting network above described cultural sight, and described temperature measuring optical cable is fixed on described supporting network.
3. system as claimed in claim 2, is characterized in that, described temperature measuring optical cable is that pectination is fixed on described supporting network and/or described temperature measuring optical cable is fixed on described supporting network after ring.
4. system as claimed in claim 3, is characterized in that, also comprise: alarm module, for when the temperature value that described sensing Framework computing obtains described region to be monitored exceedes preset value, receives the alarm command that described sensing main frame sends, sends alerting signal.
5. the system as described in any one of Claims 1 to 4, is characterized in that, described sensing main frame comprises further: light source, light wavelength division multiplexing, demarcation optical fiber, platinum resistor temperature measuring module, photoelectric detection module, acquisition module and signal processing module.Wherein,
Described light source, for launching original optical pulse;
Described light wavelength division multiplexing, original optical pulse for being launched by described light source inputs described demarcation optical fiber, and successively along described demarcation optical fiber and the transmission of described temperature measuring optical cable, and gathering the scattered light produced along described temperature measuring optical cable and described demarcation optical fiber, described scattered light comprises: flashlight and reference light;
Probe and the described demarcation optical fiber of described platinum resistor temperature measuring module are fixed together, and for measuring the temperature of described demarcation optical fiber, and send to signal processing module;
Described photoelectric detection module, converts electric signal to respectively for the described flashlight that exported by described light wavelength division multiplexing and described reference light;
Described acquisition module, for gathering electric signal corresponding to flashlight that described photoelectric detection module exports and electric signal corresponding to reference light, extract the electric signal that electric signal corresponding to the flashlight of described demarcation fibre scattering and electric signal corresponding to reference light, the electric signal corresponding to flashlight of described temperature measuring optical cable scattering and reference light are corresponding respectively;
Described signal processing module, the position of the temperature of this sampled point that temperature measuring optical cable is measured described in the electric signal that the flashlight of a certain sampled point of the electric signal corresponding for the flashlight of the described demarcation optical fiber exported according to the temperature value of described demarcation optical fiber and described acquisition module and electric signal corresponding to reference light, described temperature measuring optical cable is corresponding and electric signal demodulation corresponding to reference light and described temperature measuring optical cable corresponding to this sampled point.
6. system as claimed in claim 5, is characterized in that, in temperature measuring optical cable measurement described in demodulation, the formula of the temperature of a certain sampled point is:
Wherein, T1 is the temperature of a certain sampled point in temperature measuring optical cable, and T0 is the temperature of demarcating optical fiber, R
1(T
1) be the flashlight of temperature measuring optical cable and the ratio of reference light power, R
0(T
0) for demarcating the flashlight of optical fiber and the ratio of reference light power, h is Planck's constant, and Δ ν is the vibration frequency 13.2THz of optical fiber phonon, and K is Boltzmann constant.
7. system as claimed in claim 5, it is characterized in that, the position of the described temperature measuring optical cable that a certain sampled point is corresponding in temperature measuring optical cable described in demodulation, specifically comprise: according to the distance calculated the sampling rate of electric signal between each sampled point, sampling sequence number and the product of the distance between described each sampled point of current sampling point are the position in described temperature measuring optical cable corresponding to described current sampling point.
8. a cultural sight temperature monitoring method, is characterized in that, adopt the cultural sight temperature monitoring system as described in any one of claim 1 to 7, described method comprises:
The scattered light that the temperature measuring optical cable that collection is laid in described cultural sight region to be monitored in advance produces when transmission light pulse;
Extract the flashlight in the scattered light of described temperature measuring optical cable input and reference light;
Opto-electronic conversion is carried out respectively to described flashlight and reference light and obtains electric signal corresponding to described flashlight and electric signal corresponding to described reference light;
The electric signal corresponding according to described flashlight and electric signal corresponding to described reference light calculate, and obtain the temperature value of described region to be monitored each point;
Show the temperature value of described region to be monitored each point.
9. method as claimed in claim 8, it is characterized in that, described method also comprises: above described cultural sight, arrange supporting network, is fixed on described supporting network by described temperature measuring optical cable.
10. method as claimed in claim 9, is characterized in that, described temperature measuring optical cable is that pectination is fixed on described supporting network and/or described temperature measuring optical cable is fixed on described supporting network after ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510781086.0A CN105371980A (en) | 2015-11-13 | 2015-11-13 | Cultural relic site temperature monitoring system and monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510781086.0A CN105371980A (en) | 2015-11-13 | 2015-11-13 | Cultural relic site temperature monitoring system and monitoring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105371980A true CN105371980A (en) | 2016-03-02 |
Family
ID=55374380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510781086.0A Pending CN105371980A (en) | 2015-11-13 | 2015-11-13 | Cultural relic site temperature monitoring system and monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105371980A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907227A (en) * | 2017-11-10 | 2018-04-13 | 敦煌研究院 | A kind of earthen ruins surface and the measuring method of internal temperature change |
| CN114046899A (en) * | 2021-11-11 | 2022-02-15 | 天津津航技术物理研究所 | Intelligent monitoring system for dangerous cargo temperature of port container |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110231135A1 (en) * | 2008-09-27 | 2011-09-22 | Kwang Suh | Auto-correcting or self-calibrating DTS temperature sensing systems and methods |
| CN103364107A (en) * | 2013-07-31 | 2013-10-23 | 北京航空航天大学 | Optical fiber Raman cable temperature monitoring and alarm system with attenuation self-compensation |
| CN204405221U (en) * | 2015-01-13 | 2015-06-17 | 安徽理工大学 | Based on the dump temp measuring system of distribution type fiber-optic |
| CN104864979A (en) * | 2015-06-16 | 2015-08-26 | 北京航天易联科技发展有限公司 | Correction method of errors measured by distributed raman optical fiber temperature measuring system |
-
2015
- 2015-11-13 CN CN201510781086.0A patent/CN105371980A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110231135A1 (en) * | 2008-09-27 | 2011-09-22 | Kwang Suh | Auto-correcting or self-calibrating DTS temperature sensing systems and methods |
| CN103364107A (en) * | 2013-07-31 | 2013-10-23 | 北京航空航天大学 | Optical fiber Raman cable temperature monitoring and alarm system with attenuation self-compensation |
| CN204405221U (en) * | 2015-01-13 | 2015-06-17 | 安徽理工大学 | Based on the dump temp measuring system of distribution type fiber-optic |
| CN104864979A (en) * | 2015-06-16 | 2015-08-26 | 北京航天易联科技发展有限公司 | Correction method of errors measured by distributed raman optical fiber temperature measuring system |
Non-Patent Citations (4)
| Title |
|---|
| 刘建青 等: "基于误差补偿的分布式喇曼温度传感器", 《光子学报》 * |
| 张在宣 等: "分布式光纤拉曼光子温度传感器的研究进展", 《中国激光》 * |
| 杨睿 等: "分布式喇曼光纤测温***中修正测量误差的方法", 《光子学报》 * |
| 蓝天 等: "拉曼型分布式光纤温度传感器的自校准解调", 《红外与激光工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907227A (en) * | 2017-11-10 | 2018-04-13 | 敦煌研究院 | A kind of earthen ruins surface and the measuring method of internal temperature change |
| CN114046899A (en) * | 2021-11-11 | 2022-02-15 | 天津津航技术物理研究所 | Intelligent monitoring system for dangerous cargo temperature of port container |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205209700U (en) | Full fiber optic distributed temperature measurement monitored control system of pipeline | |
| CN110686626B (en) | OPGW (optical fiber composite overhead ground wire) icing monitoring system and method based on phase-sensitive optical time domain reflection system | |
| CN107101658B (en) | Phase sensitive optical time domain reflection distributed optical fiber sensing system method for rapidly positioning | |
| CN104101447B (en) | Distributed optical fiber temperature sensor and method for removing nonlinear error of same | |
| CN106530544A (en) | Fiber grating array perimeter intrusion system | |
| CN108414113B (en) | Fire alarm system and method for predicting optical fiber temperature by using multipoint temperature discrete coefficients | |
| CN105953941A (en) | Distributed fiber temperature measurement method and device based on Raman scattering | |
| CN107101743B (en) | The monitoring system and method for comprehensive distributed prevention spontaneous combustion of coal gangue hill | |
| CN106248174B (en) | A kind of soil stone dam seepage saturated surface optical fiber monitoring device and method | |
| CN104344913A (en) | Temperature measurement system and method based on fiber grating sensing | |
| CN103616091A (en) | Distributed optical fiber temperature and stress sensing device | |
| CN105221936B (en) | A kind of device and its control method of monitoring and positioning directly buried heat distribution pipeline road leakage point | |
| CN104614091B (en) | All -fiber long range high spatial resolution single photon temperature sensor | |
| CN112378431A (en) | Distributed optical fiber Raman sensing method based on broadband chaotic laser | |
| CN109000822A (en) | Distributed fiber temperature measuring device | |
| CN105371980A (en) | Cultural relic site temperature monitoring system and monitoring method | |
| CN105651373A (en) | Two-point synchronous vibration measuring method based on polarization optical time-domain reflection technology | |
| CN106505974A (en) | The filtering method and device of Optical fibre sampling signal, optical fiber temperature-measurement method and device | |
| CN205670054U (en) | A kind of optical fiber distributed type temperature measuring device for high-voltage cable | |
| CN102445285B (en) | Peak searching method of Brillouin optical time domain reflectometer (BOTDR) system | |
| CN104034515B (en) | The unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light | |
| CN106646670B (en) | A kind of transmission line of electricity distribution microclimate monitoring method | |
| CN106257249A (en) | It is applicable to temperature-measuring system of distributed fibers and the temp measuring method of tunnel thermometric | |
| CN203772449U (en) | Fiber temperature-measuring tape with high spatial resolution | |
| CN205118673U (en) | Device of monitoring and location direct -burried heating power pipeline leakage point |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160302 |