CN206546219U - Optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence - Google Patents
Optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence Download PDFInfo
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- CN206546219U CN206546219U CN201621387886.0U CN201621387886U CN206546219U CN 206546219 U CN206546219 U CN 206546219U CN 201621387886 U CN201621387886 U CN 201621387886U CN 206546219 U CN206546219 U CN 206546219U
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Abstract
The utility model is related to a kind of optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence, it is used to provide the laser for encouraging light including one, the first Transmission Fibers for transmitting excitation light, prism of corner cube with being used to collecting and separating up-conversion fluorescence at thermometric is set, for transmitting the second optical fiber of up-conversion fluorescence and fluorescence lifetime detection means for detecting fluorescence lifetime, described first Transmission Fibers one end is connected with laser, the other end is fixedly connected with prism of corner cube, described second Transmission Fibers one end is fixedly connected with the prism of corner cube, the other end is connected with fluorescence lifetime detection means.The beneficial effects of the utility model are：Coordinated by laser and prism of corner cube and carry out thermometric, up-conversion fluorescence is separated by prism of corner cube, up-conversion fluorescence is transmitted to fluorescence lifetime detection means, corresponding temperature value is obtained.
Description
Technical field
The utility model is related to optical fiber temperature-measurement field, more particularly to a kind of optical fiber based on rare earth ion up-conversion fluorescence is surveyed
Warm device.
Background technology
Because some thermometrics scene has relatively rugged environment, such as high temperature, high pressure, high electromagnetic interference, or even some surveys
There are certain corrosivity, radioactivity in warm scene；Or inflammable and explosive etc., it is unsuitable for electronic temperature measurement equipment and works at the scene.To solve
The problem of thermometric in above adverse circumstances, many remote temperature measurement equipment are devised, such as：Remote infrared measurement of temperature is set
Standby, remote-wireless temperature measuring equipment etc..But, these electronic equipments all have some very crucial shortcomings, such as infrared measurement of temperature equipment
Easily disturbed by spatial light, be unable to automatic real-time measurement, the temperature measuring point that narrow space can not be entered, generation electric spark etc..And it is wireless
The temperature measurement node of temperature measuring equipment largely effects on temperature measurement accuracy easily by live electromagnetic interference, or even can not carry out thermometric, simultaneously
Without anticorrosive, capability of resistance to radiation.
The fluorescence lifetime thermometry risen in recent years, is by the use of ultraviolet or black light as pump light, to containing europium
Fluorescent RE powder carries out pumping, it is launched down-conversion fluorescent, and pink or red etc. is presented in fluorescence.Then, by big straight
Fluorescence is sent to fluorescence lifetime detection means by footpath optical fiber, so as to converse temperature measuring point temperature.The technology can be good at solving
The thermometric that the various mal-conditions in thermometric scene are caused is difficult.But, because this fluorescence lifetime thermometry is used containing europium
The down-conversion fluorescent of rare-earth luminescent material, pump light and wavelength of fluorescence are not in the low loss window of optical fiber, therefore optical fiber is to pump
The loss of Pu light and fluorescence is all very big；Not enough based on more than, existing fluorescence lifetime thermometry can not realize long range thermometric, its
Thermometric distance can only achieve tens meters, cause fluorescence lifetime detection means to be necessarily mounted at the place nearer apart from thermometric scene,
Easily make fluorescence lifetime detection means by severe live influence, temperature measurement accuracy reduction or even situation about can not work occur.
To solve the problems, such as above long range thermometric, research is above turned using the up-converting phosphor technology of light stimulus rare earth ion
Also referred to as frequency upooaversion or up-conversion are changed, i.e., produces the process of short-wave long light-emitting with the light irradiation material of long wavelength.Earliest
On the luminescence studies changed on rare earth ion, phase early 1950s can be traced back to, swashed due to being changed on rare earth
Unique advantage in terms of light output, night vision, up-conversion luminescence of the domestic and international many research teams, scientific ＆ technical corporation to rare earth ion
Characteristic and mechanism expand relatively comprehensive, systematic research.At present, the upconversion mechanism of rare earth ion has been applied to conversion and swashed
The fields such as light output, upper conversion Three-dimensional Display, upper conversion infrared acquisition, upper conversion anti-counterfeiting technology.Up-conversion luminescence mechanism is main
Including conversion and photon avalanches etc. in Excited-state Absorption, energy transmission, cooperation, wherein cooperative luminescence process is typically occurred in
Between two ions of the same race.This process 1970 by Nakazawa first in YbPO4It is middle to find.As shown in figure 1, with infrared or
Near-infrared laser carries out pumping as pumping to rare earth ion, and rare earth ion a and b are distinguished into pumping to excitation state；In exciting
The a ions and b ions of state transfer energy to a virtual excited level simultaneously, launch the fluorescence of corresponding wavelength（On
Conversion fluorescence）, and a ions and b ions return to ground state by radiationless transition.It has been investigated that, it is upper to turn after pump light is cancelled
Changing fluorescence can't disappear at once, but can be decayed in the form of index；By the 1/e of fluorescence-intensity decay to initial fluorescence light intensity
The time undergone referred to as fluorescence lifetime；Research shows that the up-conversion fluorescence life-span exists with upconverting fluorescent material temperature to be determined
Functional relation., just can be with as long as determining the up-conversion fluorescence life-span using the up-conversion fluorescence life-span and the functional relation of temperature
The temperature of corresponding upconverting fluorescent material is extrapolated, so as to realize thermometric.
Utility model content
The purpose of this utility model is for above weak point there is provided a kind of based on rare earth ion up-conversion fluorescence
Optical fiber temperature-measurement device, realizes the thermometric of long range.
The utility model solves the scheme that is used of technical problem：A kind of optical fiber based on rare earth ion up-conversion fluorescence
Temperature measuring equipment, including a laser for offer excitation light, the first Transmission Fibers, setting and thermometric for transmission excitation light
Locate for the prism of corner cube for collecting and separating up-conversion fluorescence, the second Transmission Fibers for transmitting up-conversion fluorescence and for examining
The fluorescence lifetime detection means of fluorescence lifetime is surveyed, described first Transmission Fibers one end is connected with laser, the other end and pyramid rib
Mirror is fixedly connected, and described second Transmission Fibers one end is fixedly connected with the prism of corner cube, and the other end is detected with fluorescence lifetime and filled
Put connection.
Further, the prism of corner cube is processed by the glass doped with rare earth ion, ceramics or crystal-cut, institute
Prism of corner cube is stated for right angle prism, pump light highly reflecting films and the is coated with two articles of upper right-angle sides of the prism of corner cube respectively
One fluorescence highly reflecting films；The highly transmissive film of pump light is coated with two lower right-angle sides of the prism of corner cube respectively and the second fluorescence is high
Reflectance coating.
Further, first Transmission Fibers and the second Transmission Fibers be respectively perpendicular to prism of corner cube upper right-angle side or
Lower right-angle side is set.
Further, the rare earth ion is Er3+、Yb3+、 Pr3+、Tm3+Or Er3+、Yb3+、 Pr3+、Tm3+Between group
Close.
Further, the right angle prism uses Yb3+And Er3+Fluoride glass processing is cut into.
Further, the laser is pump laser, and the excitation light is pump light.
Further, first Transmission Fibers and the second Transmission Fibers are silica fibre, plastic optical fiber or nylon light
It is fine.
Further, the fluorescence lifetime detection means includes a Master control chip and is electrically connected with the Master control chip
For receive the second Transmission Fibers input photoelectric conversion module, display module and communication module, the photoelectric conversion module according to
It is secondary to be electrically connected through a signal amplification module and an AD conversion module with the Master control chip；The Master control chip is through communication module
It is electrically connected with outer PC；The Master control chip is also electrically connected with the laser.
Further, the photoelectric conversion module is PIN photodiode；The Master control chip is MCU control chips.
Compared with prior art, the utility model has following beneficial effect：
（1）Do not influenceed by electromagnetic interference, traditional thermometric mode is all to carry out thermometric by the change of electric signal, strong
Occur that thermometric is inaccurate in the case of electricity or strong magnetic disturbance, temperature measurement accuracy reduction even can not normal work situation.This practicality
The rule that the new fluorescence lifetime using up-conversion fluorescence is varied with temperature refers to the physics relevant with light as temperature-measurement principle
Amount, will not by strong electromagnetic any influence.
（2）To the thermometric of inflammable and explosive environment, realize the electronic device and equipment for producing electric spark away from temperature measuring point.This practicality
It is new that prism of corner cube is installed at temperature measuring point, laser and fluorescence lifetime detector at thermometric farther out, up to 100 meters ~
1000 meters, i.e. the first Transmission Fibers and the second Transmission Fibers can be a length of 100 meters ~ 1000 meters, realize long range automatic temperature measurement.
（3）The excitation light that up-conversion fluorescence thermometric is used is infrared or near infrared light（Such as 980nm, 1550nm wavelength）,
What is used in the existing purple light excitation down-conversion fluorescent thermometry of loss ratio when this band of light is propagated in a fiber is ultraviolet or near
Loss when ultraviolet light (such as 395nm) is propagated in a fiber is much smaller (about 1/10th), and the fluorescence produced is in a fiber
Loss is close or smaller, and fluorescence thermometric is converted above can really realize long range thermometric.
（4）Cost is low, and laser, the first Transmission Fibers, second Transmission Fibers that the utility model is used etc. are all conventional
, the product of technically reliable, the cost of up-conversion fluorescence temperature measuring equipment can be substantially reduced.
（5）Temperature measurement accuracy, sensitivity are high, because the up-converting phosphor technology that the utility model is used, its pump light and
Up-conversion fluorescence wavelength difference is larger（Up-conversion fluorescence wavelength is about pump wavelength half, is such as produced with 980nm pump lights green
Light, or feux rouges）, the separation of up-conversion fluorescence and pump light is easily realized, so as to reduce pump light to temperature measurement accuracy and sensitivity
Influence, greatly improves temperature measurement accuracy and sensitivity.
Brief description of the drawings
The utility model patent is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram that rare earth ion produces up-conversion fluorescence.
Fig. 2 is the control block diagram of the temperature measuring equipment of the utility model embodiment.
Fig. 3 is the structural representation of the prism of corner cube of the utility model embodiment.
In figure：1- prism of corner cubes；The Transmission Fibers of 2- first；The Transmission Fibers of 3- second；4- pump light highly reflecting films；5- pumpings
The highly transmissive film of light；6- the first fluorescence highly reflecting films；7- the second fluorescence highly reflecting films.
Embodiment
The utility model is further illustrated with reference to the accompanying drawings and detailed description.
As shown in Figures 1 to 3, a kind of optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence of the present embodiment, including
One is used to provide the laser of excitation light, the first Transmission Fibers 2 for transmitting excitation light, sets with being used to collect simultaneously at thermometric
Separate the prism of corner cube 1 of up-conversion fluorescence, the second Transmission Fibers for transmitting up-conversion fluorescence and for detecting fluorescence lifetime
Fluorescence lifetime detection means, described one end of first Transmission Fibers 2 is connected with laser, and the other end is fixed with prism of corner cube 1 to be connected
Connect, described one end of second Transmission Fibers 3 is fixedly connected with the prism of corner cube 1, and the other end is connected with fluorescence lifetime detection means.
From the foregoing, the beneficial effects of the utility model are：Prism of corner cube 1 is installed on temperature measuring point by the utility model
Place, laser at fluorescence lifetime detector apart thermometric with farther out, realizing long range automatic temperature measurement.
In the present embodiment, the prism of corner cube 1 by the glass doped with rare earth ion, ceramics or crystal-cut processing and
Into the prism of corner cube 1 is to be coated with pump light high reflection respectively on right angle prism, two upper right-angle sides of the prism of corner cube
The fluorescence highly reflecting films 6 of film 4 and first；The highly transmissive He of film 5 of pump light is coated with two lower right-angle sides of the prism of corner cube respectively
Second fluorescence highly reflecting films 7.
In the present embodiment, the Transmission Fibers 3 of the first Transmission Fibers 2 and second are respectively perpendicular to the upper of prism of corner cube 1
Right-angle side or lower right-angle side are set.
In the present embodiment, the rare earth ion is Er3+、Yb3+、 Pr3+、Tm3+Or Er3+、Yb3+、 Pr3+、Tm3+Between
Combination.The fluorescent material that existing down-conversion fluorescent life-span temp measuring method is used all is the rare earth compound phosphor of europium doping
Material, these materials are all powdered, and making, the stability of probe and the probe and the accurate of temperature measuring point for being unfavorable for temperature probe connect
Touch；And the upconverting fluorescent material that the utility model is used is single doping, codope or the clear glass adulterated more, ceramics or brilliant
Body, prism of corner cube 1 simple, compact, firm can be combined with optical fiber, and accurately can be fitted on temperature measuring point.
In the present embodiment, the right angle prism uses Yb3+And Er3+Fluoride glass processing is cut into.It is processed
Method comprises the following steps：
Step S1：By 53%ZrF4、18%BaF2、3%LaF3、3%A1F3、20%NaF、 1%YbF3、1% ErF3Molar fraction
It is positioned over than weighing common m grams of the mentioned component that purity is 99.99% in agate mortar, wherein 10≤m≤1000, are fully ground 1 small
When sample is made, sample is put into the dry pot of white jade；
Step S2：The SF of specified quantitative is added in the dry pot of white jade6, and the dry pot cover of white jade is covered, the dry pot of white jade is placed into
In high-temperature burner hearth；
Step S3：High temperature furnace is opened, is heated at 950 DEG C 1 hour, is then incubated 1 hour at 770 DEG C again；
Step S4：Turn off high temperature furnace, carry out natural cooling；
Step S5：The sample after cooling is taken out from the dry pot of white jade, both bulk glasses are made and are cut, right angle three is obtained
Prism.
Research shows, when irradiating Yb with 976nm laser3+,Er3+During fluoride glass sample, sample can be launched very strong
Green up-conversion fluorescence, the wavelength of up-conversion fluorescence is between 515nm to 545nm.In order that 976nm laser can preferably by
Sample absorbs and gives off fluorescence, and right-angle side plates the pump light highly reflecting films centered on 976nm on right angle prism sample
4.Simultaneously in order to preferably collect up-conversion fluorescence, the right angle top of prism of corner cube 1 made in the sample plates 530nm and is
The up-conversion fluorescence of 976nm pump light and 530nm or so is entered in center, bandwidth 15nm the first fluorescence highly reflecting films 6, realization
Row is efficiently separated；Plated simultaneously in the lower right-angle side in prism of corner cube to 530nm the second fluorescence highly reflecting films 7 and to 976nm
The highly transmissive film 5 of pump light, realize 976nm pumping light transmission and 530nm or so up-conversion fluorescence is reflected.When right angle three
Pump light optical fiber and fluorescence optical fiber are bonded together after all plated film is finished by two right-angle sides using uv-curable glue above and below prism,
It is fixed together with hypotenuse, forms combination of fiber-optic plated film right angle prism.
Pumping center wavelength of light is 976nm, and the wavelength of up-conversion fluorescence is between 515nm to 545nm, the first Transmission Fibers
The common communications single-mode quartz optical fibers of 2 a diameter of 125 μm of selections are as pump light optical fiber, and the second Transmission Fibers are from a diameter of
400 μm of multimode fibre as up-conversion fluorescence Transmission Fibers.
The fluorescence lifetime that experimental study obtains the sample up-conversion fluorescence is about 1700 microseconds at normal temperatures, and temperature
Often change one degree Celsius, fluorescence lifetime about changes 6 microseconds, so for the conversion speed and Master control chip of AD conversion module
Processing speed requires relatively low, so from STM32F103RCT6 as Master control chip, adopted while having on the single-chip microcomputer
The sample cycle most it is short be 1 microsecond AD conversion function, so without additional AD conversion chip.The chip has serial communication work(simultaneously
Can, only it need to can just realize RS232 communication functions in the outside electrical level transferring chip plus a RS232.
In the present embodiment, the laser is pump laser, and the excitation light is pump light.
In the present embodiment, the Transmission Fibers 3 of the first Transmission Fibers 2 and second be silica fibre, plastic optical fiber or
Nylon optical fiber.
In the present embodiment, the fluorescence lifetime detection means includes a Master control chip and electric with the Master control chip
The photoelectric conversion module, display module and the communication module that are used to receive the input of the second Transmission Fibers 3 even, the opto-electronic conversion mould
Block is electrically connected through a signal amplification module and an AD conversion module with the Master control chip successively；The Master control chip is through communication
Module is electrically connected with outer PC.The laser is electrically connected with the Master control chip.
In the present embodiment, the photoelectric conversion module is PIN photodiode；The Master control chip controls for MCU
Chip.
Specific implementation process of the present utility model：
Prism of corner cube 1 is arranged at thermometric, laser is opened, the light that laser is sent is passed as excitation light through first
Lose fibre 2 to transmit to prism of corner cube 1, excitation light is impinged perpendicularly on prism of corner cube 1, produces up-conversion fluorescence, and upper conversion is glimmering
Light is coupled to the second Transmission Fibers 3 from the outgoing of prism of corner cube 1, and being transferred to fluorescence lifetime detection means through the second Transmission Fibers 3 enters
The detection in row up-conversion fluorescence life-span, obtains corresponding temperature value at thermometric.
It is 976nm semiconductor laser as pumping radiant to use centre wavelength, and laser passes through
A STM32F103RCT6 IO foot control system can be realized turns off laser output within 15 nanoseconds.What 976nm lasers were exported swashs
Light passes through a diameter of silica fibre of 125 μm as pump light（That is the first Transmission Fibers 2）Shone after carrying out long-distance transmissions
It is mapped on right angle prism, up-conversion fluorescence is obtained on right angle prism：Pass through pump light Yb3+,Er3+Fluoride glass material
Material carries out pumping, makes up-conversion fluorescence of its launch wavelength between 515nm to 545nm.The right angle prism is by Yb3+With
Er3+The right angle prism that fluoride glass material is cut into.First Transmission Fibers 2 and the second Transmission Fibers 3 and right angle prism
Pass through ultra-violet curing glue bond.Right angle prism has the effect for collecting up-conversion fluorescence simultaneously, and up-conversion fluorescence can be at right angle
Outgoing on prism hypotenuse, it is using the silica fibre of 400 μ m diameters as the second Transmission Fibers 3, up-conversion fluorescence is long
The fluorescence lifetime detection means of nano second precision is incided after Distance Transmission, the fluorescence lifetime detection means uses PIN photoelectricity two
Optical signal is changed into after electric signal again by amplifying twice, is then input in AD conversion module as photo-sensitive cell by pole pipe；Adopt
With STM32F103RCT6 as Master control chip, it is bent that the electric signal after amplification obtains digitized fluorescence decay after AD conversion
Line, Master control chip extracts fluorescence lifetime by algorithm from attenuation curve, and obtained fluorescence lifetime passes through preset fitting
Curve can converse the actual temperature at thermometric.By actual verification, it is more than nanosecond glimmering that the detection means enough detects 10
Light lifetime change, corresponding to 0.01 degree Celsius of temperature change.The STM32F103RCT6 of selection has serial communication function, only
As RS232 electrical level transferring chips RS232 communication functions need to be achieved that in additional a piece of MAX232.
In summary, a kind of optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence that the utility model is provided, knot
Structure is simple, and cost is low, and reliability is high, it is possible to achieve the thermometric of long range.
Above-listed preferred embodiment, the purpose of this utility model, technical scheme and advantage are further described,
It should be understood that and the foregoing is only preferred embodiment of the present utility model, it is all not to limit the utility model
Within spirit of the present utility model and principle, any modification, equivalent substitution and improvements made etc. should be included in this practicality
Within new protection domain.
Claims (7)
1. a kind of optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence, it is characterised in that：It is used to provide excitation including one
The laser of light, the first Transmission Fibers for transmitting excitation light, it is arranged at thermometric and is used to collect and separate up-conversion fluorescence
Prism of corner cube, the second Transmission Fibers for transmitting up-conversion fluorescence and for detect fluorescence lifetime fluorescence lifetime detect dress
Put, described first Transmission Fibers one end is connected with laser, and the other end is fixedly connected with prism of corner cube, second Transmission Fibers
One end is fixedly connected with the prism of corner cube, and the other end is connected with fluorescence lifetime detection means.
2. the optical fiber temperature-measurement device according to claim 1 based on rare earth ion up-conversion fluorescence, it is characterised in that：It is described
Prism of corner cube is processed by the glass doped with rare earth ion, ceramics or crystal-cut, and the prism of corner cube is right-angle prismatic
Pump light highly reflecting films and the first fluorescence highly reflecting films are coated with respectively on mirror, two upper right-angle sides of the prism of corner cube；It is described
The highly transmissive film of pump light and the second fluorescence highly reflecting films are coated with respectively on two lower right-angle sides of prism of corner cube.
3. the optical fiber temperature-measurement device according to claim 2 based on rare earth ion up-conversion fluorescence, it is characterised in that：It is described
The upper right-angle side or lower right-angle side that first Transmission Fibers and the second Transmission Fibers are respectively perpendicular to prism of corner cube are set.
4. according to the optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence described in claim 1, it is characterised in that：It is described to swash
Light device is pump laser, and the excitation light is pump light.
5. the optical fiber temperature-measurement device according to claim 1 based on rare earth ion up-conversion fluorescence, it is characterised in that：It is described
First Transmission Fibers and the second Transmission Fibers are silica fibre, plastic optical fiber or nylon optical fiber.
6. the optical fiber temperature-measurement device according to claim 1 based on rare earth ion up-conversion fluorescence, it is characterised in that：It is described
Fluorescence lifetime detection means include a Master control chip and with the Master control chip be electrically connected be used for receive the second Transmission Fibers
Photoelectric conversion module, display module and the communication module of input, the photoelectric conversion module successively through a signal amplification module and
One AD conversion module is electrically connected with the Master control chip；The Master control chip is electrically connected through communication module with outer PC, described
Master control chip is also electrically connected with the laser.
7. the optical fiber temperature-measurement device according to claim 6 based on rare earth ion up-conversion fluorescence, it is characterised in that：It is described
Photoelectric conversion module is PIN photodiode；The Master control chip is MCU control chips.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621387886.0U CN206546219U (en) | 2016-12-17 | 2016-12-17 | Optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence |
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| CN201621387886.0U CN206546219U (en) | 2016-12-17 | 2016-12-17 | Optical fiber temperature-measurement device based on rare earth ion up-conversion fluorescence |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525281A (en) * | 2016-12-17 | 2017-03-22 | 福州大学 | Optical fiber temperature measuring equipment based on rare earth ion upconversion fluorescence and temperature measuring method thereof |
| CN107907517A (en) * | 2017-12-11 | 2018-04-13 | 武汉大学 | Thin-film material thermophysical property measurement system and method based on fluorescence lifetime |
| CN110926649A (en) * | 2019-11-27 | 2020-03-27 | 燕山大学 | High-sensitivity temperature measurement method based on different rare earth ion near-infrared fluorescence |
-
2016
- 2016-12-17 CN CN201621387886.0U patent/CN206546219U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525281A (en) * | 2016-12-17 | 2017-03-22 | 福州大学 | Optical fiber temperature measuring equipment based on rare earth ion upconversion fluorescence and temperature measuring method thereof |
| CN106525281B (en) * | 2016-12-17 | 2023-08-01 | 福州大学 | Optical fiber temperature measuring device based on rare earth ion up-conversion fluorescence and temperature measuring method thereof |
| CN107907517A (en) * | 2017-12-11 | 2018-04-13 | 武汉大学 | Thin-film material thermophysical property measurement system and method based on fluorescence lifetime |
| CN110926649A (en) * | 2019-11-27 | 2020-03-27 | 燕山大学 | High-sensitivity temperature measurement method based on different rare earth ion near-infrared fluorescence |
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Granted publication date: 20171010 Termination date: 20191217 |