CN108844870A - PM based on optical fiber structure10And PM2.5Detection instrument device and system - Google Patents
PM based on optical fiber structure10And PM2.5Detection instrument device and system Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 51
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention provides the PM based on optical fiber structure10And PM2.5Detection instrument device and system, including：Optical signal generates unit, detection array and optical frequency conversion unit；Optical signal generates unit, is connected with detection array, is loaded onto detection array for generating optical signal, and by optical signal；Detection array is connected with optical frequency conversion unit, for emitting optical signal, and scatters situation according to the particle of measurement zone and receives scattered light signal, and scattered light signal is sent to optical frequency conversion unit；Optical frequency conversion unit for generating frequency signal according to scattered light signal, and knows the distribution and environmental index of different particle diameters in atmosphere according to frequency signal.The present invention is designed using all -fiber, and optics discrete component is few, system reliability is high, and probe size is small, is easy to be laid in the environment, more suitable for current environment detection.
Description
Technical field
The present invention relates to environment PM10And PM2.5The field of test technology, more particularly, to the PM based on optical fiber structure10With
PM2.5Detection instrument device and system.
Background technique
With city Large scale construction, the dust pollution in environment is got worse.In various particulate pollutants, diameter is small
In 10 μm of particulate matter (PM10) it is known as pellet.Pellet not only on atmospheric visibility influence it is very big but also
Human health, PM are seriously threatened2.5(particulate matter of the diameter less than 2.5 μm) leads to alveolar inflammation because being able to enter human lung
And it is considered to have bigger harmfulness.And plant has apparent blocking, filtering and suction-operated to dust, so city is green
Dust particle in atmosphere can be effectively reduced by changing construction.This aspect research at present is stagnant from individual plants to different phytobiocoenoses
Dirt ability development.For PM near more acurrate measurement phytobiocoenose in research10And PM2.5The spatial distribution and situation of change of concentration,
Detection instrument is needed to have multiposition, real-time detection ability, and probe size is small, so that convenient lay around phytobiocoenose.
But current light scattering type particle size analyzer is mostly handheld portable measuring instrument, it has not been convenient to lay and to can not achieve multiposition same
When detect, can only realize spot measurement.And related academic research both at home and abroad is mainly around the measurement accuracy for improving single probe
Carry out, and is minimized for probe in current engineer application is solved, the research more blank of quasi- distribution measuring demand.
In conclusion the objective disadvantage of currently available technology is to lack a kind of instrument dress of accurate measurement environmental index
It sets.
Summary of the invention
In view of this, the purpose of the present invention is to provide the PM based on optical fiber structure10And PM2.5Detection instrument device and it is
System, is designed by using all -fiber, so that optics discrete component is reduced, system reliability increases, probe size is small, is easy in ring
It is laid in border, more suitable for current environment detection.
In a first aspect, the embodiment of the invention provides the PM based on optical fiber structure10And PM2.5Detection instrument device, including：
Optical signal generates unit, detection array and optical frequency conversion unit；
The optical signal generates unit, is connected with the detection array, for generating optical signal, and by the optical signal
It is loaded onto the detection array；
The detection array is connected, for emitting the optical signal, and according to measurement zone with the optical frequency conversion unit
Particle scattering situation receive scattered light signal, and the scattered light signal is sent to the optical frequency conversion unit；
The optical frequency conversion unit for generating frequency signal according to the scattered light signal, and is obtained according to frequency signal
Know the distribution and environmental index of different particle diameters in atmosphere.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein also
Including fiber coupler, the fiber coupler includes the first fiber coupler and the second fiber coupler, the detection array
Including multiple probes, the probe includes launching fiber and reception optical fiber.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides second of first aspect
Possible embodiment, wherein further include:
First fiber coupler generates unit with the optical signal respectively and the detection array is connected, is used for
The optical signal that unit generates is generated to the optical signal to be divided, and the optical signal after light splitting is loaded onto the detection
Array；
Second fiber coupler is connected with the detection array and the optical frequency conversion unit respectively, for pair
The scattered light signal that the detection array is sent carries out multiplex, and the scattered light signal after multiplex is sent to the optical frequency and is converted
Unit.
The possible embodiment of second with reference to first aspect, the embodiment of the invention provides the third of first aspect
Possible embodiment, wherein it includes laser, intensity modulator and CW with frequency modulation FMCW letter that the optical signal, which generates unit,
Number source, the optical frequency conversion unit includes photodetector, multiplier, filter and Fourier transform unit.
The third possible embodiment with reference to first aspect, the embodiment of the invention provides the 4th kind of first aspect
Possible embodiment, wherein further include：
The laser is connected with the intensity modulator, for generating the constant continuous light output of light intensity to described
Intensity modulator；
The FMCW signal source, is connected with the intensity modulator, for generating the first electric signal, and by described first
Electric signal is loaded onto the intensity modulator；
The intensity modulator is connected by first fiber coupler with the detection array, for according to institute
It is FMCW optical signal that electric signal, which is stated, by the continuous light modulation.
The 4th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 5th kind of first aspect
Possible embodiment, wherein further include：
The photodetector is connected with second fiber coupler and the multiplier respectively, and being used for will be described
Scattered light signal after multiplex is converted to the second electric signal, and second electric signal is sent to the multiplier；
The multiplier is connected with the FMCW signal source and the filter respectively, is used for second telecommunications
Number with the FMCW signal source generate first electric signal be multiplied to obtain third electric signal；
The Fourier transform unit is connected by the filter with the multiplier, for the third electricity
Signal carry out Fourier transformation obtain different frequency signals, with according in the different frequency signal impulse magnitude and
Number determines the particle diameter and the environmental index.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides the 6th kind of first aspect
Possible embodiment, wherein first fiber coupler is 4, and second fiber coupler is 1.
The 6th kind of possible embodiment with reference to first aspect, the embodiment of the invention provides the 7th kind of first aspect
Possible embodiment, wherein the optical signal generates 4 groups of test lights and 1 group of reference after first fiber coupler
Light, and the test light is loaded on the launching fiber, the reference light is loaded on second fiber coupler,
With with the scattered light signal multiplex.
The possible embodiment of with reference to first aspect the first, the embodiment of the invention provides the 8th kind of first aspect
Possible embodiment, wherein the probe includes optical fiber sphere lens.
Second aspect, the embodiment of the invention provides the PM based on optical fiber structure10And PM2.5Detection instrument system, including such as
The upper environment detection apparatus based on optical fiber structure, further includes instrument handle.
The present invention provides the PM based on optical fiber structure10And PM2.5Detection instrument device and system, including：Optical signal generates
Unit, detection array and optical frequency conversion unit；Optical signal generates unit, is connected with detection array, for generating optical signal, and
Optical signal is loaded onto detection array；Detection array is connected with optical frequency conversion unit, for emitting optical signal, and according to survey
The particle scattering situation for measuring area receives scattered light signal, and scattered light signal is sent to optical frequency conversion unit；Optical frequency conversion is single
Member for generating frequency signal according to scattered light signal, and knows the distribution of different particle diameters in atmosphere according to frequency signal
And environmental index.The present invention is designed using all -fiber, and optics discrete component is few, system reliability is high, and probe size is small, is easy to
It is laid in environment, more suitable for current environment detection.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the PM provided in an embodiment of the present invention based on optical fiber structure10And PM2.5Detection instrument schematic device；
Fig. 2 is another PM based on optical fiber structure provided in an embodiment of the present invention10And PM2.5Detection instrument schematic device；
Fig. 3 is particle diameter provided in an embodiment of the present invention and forward scattering luminous flux relationship；
Fig. 4 is reference signal provided in an embodiment of the present invention and the time-frequency curve graph for reflecting signal；
Fig. 5 is optical fiber PM provided in an embodiment of the present invention2.5And PM10Detector probe.
Icon：
100- optical signal generates unit；110- laser；120- intensity modulator；130-FMCW signal source；200- detection
Array；300- optical frequency conversion unit；310- photodetector；320- multiplier；330- filter；340- Fourier transformation list
Member；The first fiber coupler of 400-；The second fiber coupler of 500-.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
With city Large scale construction, the dust pollution in environment is got worse.In various particulate pollutants, diameter is small
In 10 μm of particulate matter (PM10) it is known as pellet.Pellet not only on atmospheric visibility influence it is very big but also
Human health, PM are seriously threatened2.5(particulate matter of the diameter less than 2.5 μm) leads to alveolar inflammation because being able to enter human lung
And it is considered to have bigger harmfulness.And plant has apparent blocking, filtering and suction-operated to dust, so city is green
Dust particle in atmosphere can be effectively reduced by changing construction.This aspect research at present is stagnant from individual plants to different phytobiocoenoses
Dirt ability development.For PM near more acurrate measurement phytobiocoenose in research10And PM2.5The spatial distribution and situation of change of concentration,
Detection instrument is needed to have multiposition, real-time detection ability, and probe size is small, so that convenient lay around phytobiocoenose.
But current light scattering type particle size analyzer is mostly handheld portable measuring instrument, it has not been convenient to lay and to can not achieve multiposition same
When detect, can only realize spot measurement.And related academic research both at home and abroad is mainly around the measurement accuracy for improving single probe
Carry out, and is minimized for probe in current engineer application is solved, the research more blank of quasi- distribution measuring demand.
In conclusion the objective disadvantage of currently available technology is to lack a kind of instrument dress of accurate measurement environmental index
It sets.Based on this, the environment detection apparatus and system provided in an embodiment of the present invention based on optical fiber structure is set using all -fiber
Meter, optics discrete component is few, system reliability is high, and probe size is small, is easy to be laid in the environment, more suitable for current environment
Detection.
For convenient for understanding the present embodiment, first to disclosed in the embodiment of the present invention based on the environment of optical fiber structure
PM10And PM2.5Detection instrument device describes in detail.
Embodiment one：
Referring to Fig.1, based on the PM of optical fiber structure10And PM2.5Detection instrument device, including：Optical signal generates unit 100, visits
Survey array 200 and optical frequency conversion unit 300；
Optical signal generates unit 100, is connected with detection array 200, is loaded onto for generating optical signal, and by optical signal
Detection array；
Detection array 200 is connected with optical frequency conversion unit 300, for emitting the optical signal, and according to measurement zone
Particle scatters situation and receives scattered light signal, and scattered light signal is sent to optical frequency conversion unit；
Optical frequency conversion unit 300 for generating frequency signal according to scattered light signal, and knows atmosphere according to frequency signal
The distribution and environmental index of middle difference particle diameter.
It further, further include fiber coupler, fiber coupler includes the first fiber coupler 400 and the second optical fiber coupling
Clutch 500, detection array 200 include multiple probes, and probe includes launching fiber and reception optical fiber.
Further, the first fiber coupler 400 generates unit 100 with optical signal respectively and detection array 200 is connected
It connects, is divided for generating the optical signal that unit generates to optical signal, and the optical signal after light splitting is loaded onto detection array
200；
Second fiber coupler 500, is connected with detection array 200 and optical frequency conversion unit 300 respectively, for detection
The scattered light signal that array 200 is sent carries out multiplex, and the scattered light signal after multiplex is sent to optical frequency conversion unit 300.
Further, it includes laser 110, intensity modulator 120 and CW with frequency modulation FMCW that optical signal, which generates unit 100,
Signal source 130, optical frequency conversion unit 300 include photodetector 310, multiplier 320, filter 330 and Fourier transformation list
Member 340.
Further, laser 110 are connected with intensity modulator 120, for generating the constant continuous light output of light intensity
To intensity modulator；
FMCW signal source 130 is connected with intensity modulator 120, for generating the first electric signal, and by the first electric signal
It is loaded onto intensity modulator；
Intensity modulator 120 is connected by the first fiber coupler 400 with detection array 200, for according to electric signal
It is FMCW optical signal by continuous light modulation.
Further, photodetector 310 are connected with the second fiber coupler 500 and multiplier 320 respectively, are used for
Scattered light signal after multiplex is converted into the second electric signal, and the second electric signal is sent to multiplier；
Multiplier 320 is connected with FMCW signal source 130 and filter 330 respectively, is used for the second electric signal and FMCW
The first electric signal that signal source generates is multiplied to obtain third electric signal；
Fourier transform unit 340 is connected by filter 330 with multiplier 320, for carrying out to third electric signal
Fourier transformation obtains different frequency signals, with according in different frequency signals impulse magnitude and number determine that particle is straight
Diameter and environmental index.
Further, the first fiber coupler is 4, and the second fiber coupler is 1.
Further, optical signal generates 4 groups of test lights and 1 group of reference light, and the survey after the first fiber coupler
Examination light be loaded on launching fiber, reference light is loaded on the second fiber coupler, with scattered light signal multiplex.
Further, probe includes optical fiber sphere lens.
The embodiment of the present invention improves traditional angular scattering method measurement partial size system.Using optical fiber as light-conductive media, utilize
Optical fiber spherical end surface replaces traditional discrete lens, realizes probe miniaturization.The CW with frequency modulation being introduced into Radar Technology
(FMCW) technology realizes the multiplexing of multiple probes.The system can be to PM multipoint in environment10And PM2.5Index is online simultaneously
Monitoring.And whole system opticator is designed using all -fiber, and optics discrete component is few, system reliability is high, probe size
It is small, it is easy to be laid in the environment.The design studies further experiment and provides reference, provides for the research of phytobiocoenose dust retention
Feasible detecting strategy.
Embodiment two：
In order to realize quasi- distribution measuring, PM is present embodiments provided10And PM2.5Sensor array, as shown in Figure 2.
System work process is as follows：
1, the continuous light output of laser, light intensity are constant.Electric signal is loaded into intensity modulator, laser warp by FMCW signal source
It crosses intensity modulator and becomes FMCW optical signal.
2, modulated optical signal enters in each probe by coupler (the first fiber coupler) light splitting.In order to make into
The laser intensity for entering each probe is identical, and the splitting ratio of C1 to C4 is respectively 1:4,1:3,1:2,1:1.
3, the light separated through coupler enters each probe, and launching fiber emits a branch of superfine directional light in probe,
Define measured zone A in directional light beam waist position (volume is sufficiently small, it can be assumed that only one each particle process).And it receives
The focus of optical fiber is fallen in the A of region.When measurement zone does not have particle, there is no scattering phenomenon, light does not enter reception optical fiber.
Scattered signal is generated when measured zone has particulate matter to pass through, and has light to enter reception optical fiber.
4, tetra- reception optical fibers of R1, R2, R3, R4 enter detector after coupler (the second fiber coupler) multiplex.
R5 is reference light, due to weakening influence of the laser light-intensity variation to detection accuracy.
5, it receives light and is converted to electric signal through photodetector, the electric signal generated with original FMCW signal source is multiplied.
Since different optical path differences causes the optical signal returned to have different delays from the FMCW signal generated.To generate different frequencies
Rate.
6, the different frequency signals by the signal after multiplication Jing Guo Fast Fourier Transform (FFT).
7, when having particle by measured zone in the probe of the leftmost side, R1 receives a pulse signal.Fast Fourier
After transformation, there is a pulse signal at the frequency of response (frequency size can add time delay ring Exact Design by optical path).Pass through
The number of signal is the particle number that may know that through probe one at the unit of account time frequency.Pass through impulse magnitude and particle
The diameter of all particles can be obtained in the relationship of diameter.Prolonged statistics is eventually passed through, that is, may know that different particles in atmosphere
The distribution of diameter and PM10And PM2.5Etc. indexs.
It should be noted that the prior art belongs to the related content on algorithm, more mature, this reality in concentration statistic processes
Example is applied not tell about excessively.The innovative point of the present embodiment is to have used the structure of optical fiber, can be realized the distribution to multiple spot and survey
Amount, and without having used optical fiber sphere lens, having realized miniaturization and the height of system using the discrete lens in commercial detector
Reliably.FMCW modulation is to discriminate between different probe signals using purpose.
The detection array is made of four primitives, and laser emits light into light intensity modulator.According to CW with frequency modulation
Principle, signal generator generate the FMCW signal of frequency cycle variation.Signal carries out intensity modulated to laser all the way, separately
It is input in multiplier as reference signal all the way.Modulated laser is divided through coupler C1~C4 enters different probes
In.When the search coverage particle of a certain probe passes through, the optical signal of scattering is collected into photodetection by corresponding reception optical fiber
Device is changed into electric signal.
It, cannot be to signal distinguishing in time domain when multiple probes while when thering is particle to pass through.But the light path of four probes is different,
Each road signal obtains different difference frequency signals after being multiplied from reference signal, to realize the differentiation of different probe signals.Assuming that in Fu
It is f that difference frequency is obtained after leaf transformation1、f2、f3、f4, wherein f1~f4Respectively correspond four probe detection signals.In test, in probe
Measured zone when thering is particle to pass through, there is pulse in corresponding frequencies signal, and the number of pulse corresponds to the number of particulate matter, pulse
Size corresponds to the diameter of particulate matter.Particle distribution and mass concentration can be obtained by long-time statistical measurement, to obtain
The PM of four position atmosphere2.5And PM10Index.
The system is intensity type optical fiber sensing system, so laser power fluctuation will lead to grain diameter measurement inaccuracy.For
Reduction optical power fluctuation influences, and R5 is received light is used as and refer to light intensity, and corresponding frequency difference is f5.The signal is continuous signal, letter
Number amplitude is directly proportional to laser power.Use f1Divided by f4f5Signal amplitude, thus eliminate power swing influence.
The angular scattering method measuring principle that the present embodiment is related to is explained as follows：
Particle of the diameter less than 10 μm is usually in elliposoidal in atmosphere, can be approximated to be isotropic spheroidal particle.Root
According to MIE scattering theory, when directional light is incident on spheroidal particle, scattered light intensity spatial distribution is expressed as：
In formula, θ is scattering light and incident light angle, I0For incident intensity, λ be optical maser wavelength, observation point and particle phase away from
r。S1(θ) and S2(θ) is respectively the distribution of amplitudes function for being parallel and perpendicular to scattering section, and is expressed as：
Wherein, coefficient anAnd bnIt is and spheroidal particle scale parameter(a is particle diameter) and refractive index m are related
Function, expression formula are as follows：
In formula,ξn、ξ’nIt is function related with half rank Bessel and Hankel, can be carried by Matlab software
Function directly calculate.In formula (2), angular scattering function τnAnd πnExpression formula is as follows：
Wherein,, can be by low order recursion to high-order for Legnedre polynomial, recurrence formula is as follows：
By initial value π0=0, π1=1, which brings above formula into, can find out each rank scattering angle function.
According to above-mentioned MIE scattering theory, using Matlab software, to laser wavelength lambda=650nm, refractive index m=1.57-
The different-diameter Particle Scattering characteristic Simulation of 0.56i is dissipated according at a=0.1 μm, 0.5 μm, 2.5 μm, 5 μm, 10 μm of particle diameter
Known to the spatial distribution simulation result for penetrating light intensity.As a/ λ<<1, forward and backward scatter intensity distribution is uniform, and Ruili occurs at this time
Scattering；When partial size increase to it is close with wavelength dimension, total scattering light intensity increase and to small angle range concentrate, MIE occurs at this time
Scattering.In order to improve detection signal-to-noise ratio, received before generalling use to low-angle.
Angular scattering method is the measurement by measuring the realization of the scatter light flux in some angular range to particle diameter.Fig. 3
For the relationship of partial size within the scope of scatteringangleθ=5 °~30 ° and luminous flux.
From the figure 3, it may be seen that existence anduniquess corresponding relationship between particle diameter and luminous flux in the angular range.By measuring light
Flux magnitude is the diameter that can determine particle.The different size of particle distribution of entire air and PM can be obtained in measurement for a long time10With
PM2.5Index.
The CW with frequency modulation basic principle measuring principle that the present embodiment is related to is explained as follows：
CW with frequency modulation (FMCW) technology is a kind of technology used in High Accuracy Radar ranging.Fmcw radar it is basic
Principle is that transmitted wave is high frequency continuous wave, and frequency changes according to sawtooth wave rule at any time, the received echo frequency of radar and hair
The frequency changing rule penetrated is identical, is all sawtooth wave rule, only has a time difference, as shown in Figure 4.ω in figure0Centered on
Angular frequency, Δ ω are the scanning range of angular frequency, TmFor modulation period.Reference signal instantaneous angular frequency can be expressed as：
Wherein, 0<t<Tm,Indicate frequency change rate.
Frequency obtains the phase of signal about time integral, to obtain reference signal function S1(t)：
Equally, reflection signal S can be obtained2(t)
To reference signal and reflection signal mixing, and by low-pass filter filter to obtain its difference frequency signal be：
In formula, τ is reference signal and reflection signal delay.The angular frequency of difference frequency signal can be expressed as：
In formula, c1For detectable signal spread speed, L reflects the position of reflection event generation.From the above equation, we can see that L and difference
Frequency signal existence anduniquess corresponding relationship.
The sonde configuration that the present embodiment is related to is described below：
When directional light is irradiated to particle, the received scatter light flux of forward direction low-angle is corresponding with partial size existence anduniquess to be closed
System may know that the size of particle diameter by detecting the size of luminous flux under low-angle.In existing research and product, mostly
It is handheld, and can only once measure the particle concentration of a position, probe frequently with discrete lens group to laser carry out collimation with
It receives.
In order to realize probe miniaturization, discrete lens group is substituted using optical fiber spherical end surface, from newly-designed sonde configuration
As shown in Figure 5.
The end face of launching fiber and reception optical fiber is sphere lens in figure.Compared with planar end surface optical fiber, spheric end mask
There is optically focused characteristic, ideal focal length can be obtained by controlling ellipsoidal parameter.Rattan storehouse LZM-100 heat sealing machine can be realized spherical shape at present
The production of end face, and parameter can pass through process control.
Embodiment three：
Environment PM based on optical fiber structure10And PM2.5Detection instrument system, including as described above based on optical fiber structure
Environment PM10And PM2.5Detection instrument device further includes instrument handle.
Environment PM provided in an embodiment of the present invention based on optical fiber structure10And PM2.5Detection instrument system, with above-mentioned implementation
The environment detection apparatus technical characteristic having the same based on optical fiber structure that example provides, so also can solve identical skill
Art problem reaches identical technical effect.
Environment PM based on optical fiber structure provided by the embodiment of the present invention10And PM2.5Detection instrument device and system
Computer program product, the computer readable storage medium including storing program code, the instruction that said program code includes
It can be used for executing previous methods method as described in the examples, specific implementation can be found in embodiment of the method, and details are not described herein.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase
To importance.
Finally it should be noted that：Embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that：Anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of PM based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that including：Optical signal generation unit,
Detection array and optical frequency conversion unit；
The optical signal generates unit, is connected with the detection array, loads for generating optical signal, and by the optical signal
To the detection array；
The detection array is connected with the optical frequency conversion unit, for emitting the optical signal, and according to of measurement zone
Grain scattering situation receives scattered light signal, and the scattered light signal is sent to the optical frequency conversion unit；
The optical frequency conversion unit for generating frequency signal according to the scattered light signal, and is known greatly according to frequency signal
The distribution and environmental index of different particle diameters in gas.
2. the PM according to claim 1 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that also wrap
Fiber coupler is included, the fiber coupler includes the first fiber coupler and the second fiber coupler, the detection array packet
Multiple probes are included, the probe includes launching fiber and reception optical fiber.
3. the PM according to claim 2 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that also wrap
It includes:
First fiber coupler generates unit with the optical signal respectively and the detection array is connected, for institute
It states the optical signal that optical signal generation unit generates to be divided, and the optical signal after light splitting is loaded onto the detection battle array
Column；
Second fiber coupler is connected with the detection array and the optical frequency conversion unit respectively, for described
The scattered light signal that detection array is sent carries out multiplex, and the scattered light signal after multiplex is sent to the optical frequency and converts list
Member.
4. the PM according to claim 3 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that described
It includes laser, intensity modulator and CW with frequency modulation FMCW signal source, the optical frequency conversion unit packet that optical signal, which generates unit,
Include photodetector, multiplier, filter and Fourier transform unit.
5. the PM according to claim 4 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that also wrap
It includes：
The laser is connected with the intensity modulator, for generating the constant continuous light output of light intensity to the intensity
Modulator；
The FMCW signal source, is connected with the intensity modulator, for generating the first electric signal, and by first telecommunications
Number it is loaded onto the intensity modulator；
The intensity modulator is connected by first fiber coupler with the detection array, for according to the electricity
The continuous light modulation is FMCW optical signal by signal.
6. the PM according to claim 5 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that also wrap
It includes：
The photodetector is connected with second fiber coupler and the multiplier respectively, is used for the multiplex
Scattered light signal afterwards is converted to the second electric signal, and second electric signal is sent to the multiplier；
The multiplier is connected with the FMCW signal source and the filter respectively, for will second electric signal and
First electric signal that the FMCW signal source generates is multiplied to obtain third electric signal；
The Fourier transform unit is connected by the filter with the multiplier, for the third electric signal
Carry out Fourier transformation obtain different frequency signals, with according in the different frequency signal impulse magnitude and number it is true
The fixed particle diameter and the environmental index.
7. the PM according to claim 2 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that described
First fiber coupler is 4, and second fiber coupler is 1.
8. the PM according to claim 7 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that described
Optical signal generates 4 groups of test lights and 1 group of reference light after first fiber coupler, and the test light is loaded on institute
State on launching fiber, the reference light is loaded on second fiber coupler, with the scattered light signal multiplex.
9. the PM according to claim 2 based on optical fiber structure10And PM2.5Detection instrument device, which is characterized in that described
Probe includes optical fiber sphere lens.
10. a kind of PM based on optical fiber structure10And PM2.5Detection instrument system, which is characterized in that including such as claim 1 to power
Benefit requires 9 described in any item environment PM based on optical fiber structure10And PM2.5Detection instrument device further includes instrument handle.
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|---|---|---|---|
| CN201810901074.0A CN108844870B (en) | 2018-08-08 | 2018-08-08 | PM based on optical fiber structure10And PM2.5Probe instrument apparatus and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901074.0A CN108844870B (en) | 2018-08-08 | 2018-08-08 | PM based on optical fiber structure10And PM2.5Probe instrument apparatus and system |
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| Publication Number | Publication Date |
|---|---|
| CN108844870A true CN108844870A (en) | 2018-11-20 |
| CN108844870B CN108844870B (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020091432A (en) * | 2018-12-06 | 2020-06-11 | 株式会社豊田中央研究所 | Switch type optical antenna and optical scanning device |
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