CN205449326U - Device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber - Google Patents
Device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber Download PDFInfo
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- CN205449326U CN205449326U CN201620169968.1U CN201620169968U CN205449326U CN 205449326 U CN205449326 U CN 205449326U CN 201620169968 U CN201620169968 U CN 201620169968U CN 205449326 U CN205449326 U CN 205449326U
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- optic fibre
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Abstract
The utility model discloses a device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber, wherein the 980nm pump light source is passed through optic fibre and wavelength division multiplexer and is linked to each other, wavelength division multiplexer's one end through optic fibre in proper order with mix bait optic fibre, a dislocation optic fibre and a fiber coupler link to each other, the continuous light reflection of the component mirror of optic fibre is passed through at the other both ends relative with the input among the fiber coupler, a fiber coupler's surplus one end is unsettled, wavelength division multiplexer's the other end pass through optic fibre in proper order with the 2nd fiber coupler, photoelectric detector and frequency analyzer link to each other, the continuous light reflection of the component mirror of optic fibre is passed through at the other both ends relative with the input among the 2nd fiber coupler, the 2nd fiber coupler's surplus one end is passed through optic fibre and is linked to each other with photoelectric detector. The utility model discloses have higher measurement accuracy nature, low cost easily realizes having super high stability and accuracy.
Description
Technical field
This utility model belongs to temperature measuring equipment technical field, is specifically related to a kind of device realizing laser beat frequency thermometric based on optical fiber FP chamber.
Background technology
Temperature is an important physical parameter, and temperature sensor occupies an important position in numerous sensors, and oneself is through defining a industry the biggest, and the annual the most directly or indirectly output value in the whole world is up to tens dollars.In commercial production, monitoring temperature for intelligent instrument, control system and production process is highly important, if able to scene temperature is promptly and accurately detected, the problem that so can early find while normally producing maintaining instrument to exist, so contribute to whole process safety stably to carry out, guarantee the quality of production, help enterprise to reduce loss.Especially some buildings such as bridge, dam and the safety detection of petrochemical industry, need necessary parameter is carried out real-time online detection, but in the temperature detection device that some are traditional, when special environment, (such as electromagnetic interference, corrosivity are strong, inflammable and explosive) but exposes significant limitation, and the cost of multiple spot detection simultaneously is the highest.Under this background, the FP chamber with optical fiber as sensing media, fiber grating temperature sensor arise at the historic moment, the advantage such as these sensors are explosion-proof with it, electromagnetism interference, anticorrosive, high temperature resistant, compact structure and be widely used.The weak points such as optical fiber FP cavity sensor can reach higher resolution and precision to the measurement of temperature, but it is big to there is processing technology difficulty, and cost is high, and demodulating system is complicated.Conventional demodulation mode has interferometric demodulation method, but systemic resolution and precision loudness are relatively low, and demodulation structure is more complicated, is not easy to actual application.Otherwise interfering with method demodulation utilizes spectrogrph to carry out interference pattern analysis, but spectrogrph is expensive.Therefore, find convenient and simple cheap and that systemic resolution is high demodulation mode and become more and more important.
Summary of the invention
This utility model solves the technical problem that the device realizing laser beat frequency thermometric based on optical fiber FP chamber that there is provided a kind of cheap, simple in construction and be easily achieved.
This utility model adopts the following technical scheme that for solving above-mentioned technical problem, a kind of device realizing laser beat frequency thermometric based on optical fiber FP chamber, it is characterized in that: 980nm pump light source is connected with wavelength division multiplexer by optical fiber, one end of wavelength division multiplexer by optical fiber successively with erbium-doped fiber, dislocation optical fiber and the first fiber coupler are connected, other two ends relative with input in this first fiber coupler are connected by optical fiber and constitute light reflecting mirror, residue one end of first fiber coupler is unsettled, the other end of wavelength division multiplexer by optical fiber successively with the second fiber coupler, photodetector is connected with frequency analyzer, other two ends relative with input in this second fiber coupler are connected by optical fiber and constitute light reflecting mirror, residue one end of second fiber coupler is connected with photodetector by optical fiber.
In this utility model, two light reflecting mirrors constitute optical fiber FP chamber, dislocation optical fiber is as temperature test point, the respective change of temperature is obtained by observing the change of laser beat frequency on spectrum analyzer, compare interferometric demodulation method, beat frequency demodulation method structure is simpler, degree of accuracy is higher, and result is more stable and relative low price, has good market prospect.
Accompanying drawing explanation
Fig. 1 is light path connection figure of the present utility model.
In figure: 1,980nm pump light source, 2, optical fiber, 3, wavelength division multiplexer, 4, erbium-doped fiber, 5, dislocation optical fiber, the 6, first fiber coupler, 7, photodetector, 8, spectrum analyzer, the 9, second fiber coupler.
Detailed description of the invention
Particular content of the present utility model is described in detail in conjunction with accompanying drawing.A kind of device realizing laser beat frequency thermometric based on optical fiber FP chamber, wherein 980nm pump light source 1 is connected with wavelength division multiplexer 3 by optical fiber 2, one end of wavelength division multiplexer 3 by optical fiber 2 successively with erbium-doped fiber 4, dislocation optical fiber 5 is connected with the first fiber coupler 6, other two ends relative with input in this first fiber coupler 6 are connected by optical fiber 2 and constitute light reflecting mirror, residue one end of first fiber coupler 6 is unsettled, the other end of wavelength division multiplexer 3 by optical fiber 2 successively with the second fiber coupler 9, photodetector 7 is connected with frequency analyzer 8, other two ends relative with input in this second fiber coupler 9 are connected by optical fiber 2 and constitute light reflecting mirror, residue one end of second fiber coupler 9 is connected with photodetector 7 by optical fiber 2.
This utility model is in specific implementation process, two light reflecting mirrors being made up of fiber coupler and optical fiber form optical fiber FP chamber, the pump light sent by 980nm pump light source enters in optical fiber FP chamber by wavelength division multiplexer, when light passes through the dislocation optical fiber in optical fiber FP chamber, light is introduced into first dislocation optical fiber fusion welding point, the most a part of light enters in fibre cladding and propagates, and another part light then continues to propagate in fiber core.Owing to light can produce multiple pattern in covering propagation, when light enters second dislocation optical fiber fusion welding point, the light in fibre core carries out coupling propagating the most forward with the light of the different mode in covering.Light shakes in optical fiber FP chamber back and forth, due to the amplification of erbium-doped fiber in optical fiber FP chamber, can observe stable laser beat frequency phenomenon on spectrum analyzer.
This utility model is using the optical fiber temperature test point as this device that misplaces, and the temperature being applied on dislocation optical fiber by change changes light and propagates the pattern of light in covering, and then changes the laser beat frequency signal that optical fiber FP chamber produces.Utilize origin software that the data of laser beat frequency signal are processed, draw out the curve chart of temperature and beat frequency, and then demodulate the change of temperature, it is achieved that the measurement of temperature.Utilizing spectrogrph to be analyzed interference of light spectrum relative to the method for relating to, this device utilizes spectrum analyzer to be analyzed frequency signal, cheap, simple in construction, clear principle, and the temperature resolution measured is relatively high and stable, has good market application foreground.
Of the present utility model ultimate principle has more than been shown and described; principal character and advantage; on the premise of without departing from this utility model spirit and scope, this utility model also has various changes and modifications, and these changes and improvements both fall within claimed scope of the present utility model.
Claims (1)
1. the device realizing laser beat frequency thermometric based on optical fiber FP chamber, it is characterized in that: 980nm pump light source is connected with wavelength division multiplexer by optical fiber, one end of wavelength division multiplexer by optical fiber successively with erbium-doped fiber, dislocation optical fiber and the first fiber coupler are connected, other two ends relative with input in this first fiber coupler are connected by optical fiber and constitute light reflecting mirror, residue one end of first fiber coupler is unsettled, the other end of wavelength division multiplexer by optical fiber successively with the second fiber coupler, photodetector is connected with frequency analyzer, other two ends relative with input in this second fiber coupler are connected by optical fiber and constitute light reflecting mirror, residue one end of second fiber coupler is connected with photodetector by optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620169968.1U CN205449326U (en) | 2016-03-01 | 2016-03-01 | Device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620169968.1U CN205449326U (en) | 2016-03-01 | 2016-03-01 | Device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber |
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| CN205449326U true CN205449326U (en) | 2016-08-10 |
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| CN201620169968.1U Expired - Fee Related CN205449326U (en) | 2016-03-01 | 2016-03-01 | Device based on laser beat frequency temperature measurement is realized in optic fibre FP chamber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
-
2016
- 2016-03-01 CN CN201620169968.1U patent/CN205449326U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20170301 |
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| CF01 | Termination of patent right due to non-payment of annual fee |