CN109357786A - A kind of system for detecting temperature and method based on sapphire fiber grating sensor - Google Patents
A kind of system for detecting temperature and method based on sapphire fiber grating sensor Download PDFInfo
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- CN109357786A CN109357786A CN201811465631.5A CN201811465631A CN109357786A CN 109357786 A CN109357786 A CN 109357786A CN 201811465631 A CN201811465631 A CN 201811465631A CN 109357786 A CN109357786 A CN 109357786A
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- temperature
- grating sensor
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- fiber grating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
The invention proposes a kind of system for detecting temperature and method based on sapphire fiber grating sensor.Present system includes: wideband light source, sapphire fiber grating sensor, optical fiber circulator, F-P filter, photoelectric conversion module, A/D conversion module, acquisition control module, D/A conversion module, computer module.The method of the present invention is that the reflection wavelength of sapphire fiber grating sensor at each temperature is detected using spectrometer；The model of fit between reflected light wavelength and temperature is obtained according to least square method；Sapphire fiber grating sensor is placed in object to be measured, the light beam of wideband light source transmitting is output to F-P filter through optical fiber circulator；Change F-P cavity length to the driving voltage digit period property sent according to acquisition control module；It obtains F-P filter transmission photovoltage maximum value and is stored in acquisition control module；Temperature information is obtained according to the model of fit between reflected light wavelength and temperature and result is subjected to display output.
Description
Technical field
The present invention relates to sensory field of optic fibre, and in particular to a kind of temperature detection based on sapphire fiber grating sensor
System and method.
Background technique
It is also increasing to thrust, the thrust ratio of aircraft with the raising of flight and flying speed, result in boat
Inlet temperature, the chamber temperature of empty engine greatly improve, and currently advanced aero-turbine inlet temperature has reached
1650 DEG C or more, with the continuous development of aircraft industry, the following more advanced aero-engine operating temperature can be mentioned further
Height, so that becoming urgent need to solve the problem to the monitoring technology of aero-engine temperature.
The measureing method of high-temperature common at present has non-contact measurement and contact type measurement non-contact measurement to be only limitted to visit
The temperature field measurement for the body structure surface that light source can cover is surveyed, and to the position that inside configuration or probe source can not cover
It sets, temperature measurement can not be carried out, meanwhile, it is easy the interference by ambient background radiation noise and reduces temperature test precision.It connects
Touch measurement method can be realized to be contacted with the direct of tested heat source, and the temperature measurement that can take into account measured structure surface and inside needs
Want, but the temperature instability due to being limited to material itself and weaker electromagnetism interference and can not be applied to for a long time
High temperature measurement is carried out in complicated electromagnetic environment.
For a long time, in practical applications, high temperature measurement is a technical problem.The prior art can not fully meet reality
Border demand develops a kind of high precision, high reliablity and adapts to the novel measurement technique of various varying environments as urgently to be solved
Problem.
The fiber bragg grating material that the present invention uses is a kind of near-infrared high temperature resistant light haveing excellent performance for sapphire
Material is learned, monocrystalline fusing point reaches 2045 DEG C, and corrosion-resistant, physical and chemical performance is stablized, and mechanical strength is good, the optical fiber cloth made of it
Glug grating temperature sensor has many advantages, has broad application prospects in high temperature monitoring field.
Summary of the invention
In view of the above shortcomings of the prior art, a kind of temperature detection based on sapphire fiber grating sensor is provided
System and method.The present invention uses sapphire fiber grating sensor, can steady operation under high temperature environment, there is contact to survey
Amount, high temperature limit tolerance level reach 1800 DEG C, strong antijamming capability, high stability, high mechanical strength, high optical stability, can
Real-time monitoring feature.
The technical solution of present system is a kind of system for detecting temperature based on sapphire fiber grating sensor, packet
It includes: wideband light source, sapphire fiber grating sensor, optical fiber circulator, F-P filter, photoelectric conversion module, A/D modulus of conversion
Block, acquisition control module, D/A conversion module, computer module；The optical fiber circulator includes tri- interfaces of A, B, C；
The wideband light source is connect with the A interface of the optical fiber circulator by optical fiber；The sapphire fiber grating passes
Sensor is connect with the B interface of the optical fiber circulator by optical fiber；The C interface of the optical fiber circulator and the F-P filter
It is connected by optical fiber；The F-P filter is connect with the photoelectric conversion module by optical fiber；The photoelectric conversion module and institute
A/D conversion module is stated to connect by conducting wire；The A/D conversion module is connect with the acquisition control module by conducting wire；It is described
Acquisition control module is connect with the computer module by conducting wire；The acquisition control module and the D/A conversion module are logical
Cross conducting wire connection；The D/A conversion module is connect with the F-P filter by conducting wire.
Preferably, the wideband light source, spectral region 240mm-2400mm.
Preferably, the sapphire fiber grating sensor, inside uses sapphire fiber Bragg grating, and outside is adopted
It is packaged, is placed in object to be measured with boron nitride ceramics sleeve, the reflecting light personal attendant of sapphire fiber grating sensor
Extraneous temperature linearity variation.
Preferably, the light that the wideband light source issues inputs the fiber annular from the A interface of the optical fiber circulator
Device exports from the B interface of the optical fiber circulator and enters the sapphire fiber grating sensor；The sapphire fiber grating
The reflected light of sensor inputs the optical fiber circulator from the B interface of the optical fiber circulator, connects from the C of the optical fiber circulator
Mouth enters the F-P filter.
Preferably, the F-P filter is for exporting transmitted light to the photoelectric conversion module, the transmitted light wave of output
The long driving voltage digital signal exported with the acquisition control module is linear, if the acquisition control module receives
Transmitted light voltage digital signal maximum value, then the reflected light wavelength of the sapphire fiber grating sensor and F-P filter are defeated
Transmitted light wave length out is equal；
Preferably, the transmitted light that the photoelectric conversion module is used to export the F-P filter carries out photoelectric conversion
Transmitted light voltage analog signal is obtained, transmitted light voltage analog signal is transmitted to the A/D conversion module；
Preferably, the A/D conversion module is used to be transmitted transmitted light voltage analog signal progress analog-to-digital conversion
Transmitted light voltage digital signal is transmitted to the acquisition control module by photovoltage digital signal；
Preferably, the acquisition control module is used to send driving voltage digital signal to the D/A conversion module, and
The transmitted light voltage digital signal of this acquisition is compared with the transmitted light voltage digital signal of last time acquisition, Zhi Daoben
The transmitted light voltage digital signal of secondary acquisition is less than the transmitted light voltage digital signal of last acquisition, the transmission of last time acquisition
Photovoltage digital signal is F-P filter transmission photovoltage maximum value, and the last time sends the D/A conversion module
Driving voltage digital signal is stored in acquisition control module and is sent to the computer module.
Preferably, the D/A conversion module is used for the driving voltage digital signal for exporting the acquisition control module
Be converted to driving voltage analog signal；
Preferably, the driving voltage digital signal that the computer module is sent according to the acquisition control module obtains
F-P filter output transmitted light wavelength, F-P filter output a length of sapphire fiber grating sensor of transmitted light wave it is anti-
Optical wavelength is penetrated, temperature information is calculated simultaneously according to the model of fit between reflected light wavelength and temperature in the computer module
Output display.
The technical solution of the method for the present invention is a kind of sapphire fiber Bragg grating high temp sensitive detection method, specific to walk
It is rapid as follows:
Step 1: sapphire fiber grating sensor being put into insulating box, sets different temperature and at each temperature
Heat preservation a period of time, the reflection wavelength of sapphire fiber grating sensor at each temperature is detected using spectrometer；
Step 2: by the reflection wavelength of sapphire fiber grating sensor at a temperature of varying environment temperature and varying environment,
Linear fitting is carried out using least square method, is obtained quasi- between the reflected light wavelength of sapphire fiber grating sensor and temperature
Molding type；
Step 3: sapphire fiber grating sensor being placed in object to be measured, the light beam of wideband light source transmitting is through optical fiber
The A interface of circulator enters optical fiber circulator, then is exported by the B interface of optical fiber circulator, and light beam connects by the B of optical fiber circulator
Mouth enters sapphire fiber grating sensor, and object to be measured can make the reflection of sapphire fiber grating sensor at different temperatures
Optical wavelength changes, and the B interface for passing through optical fiber circulator again from the reflected light of sapphire fiber grating sensor enters optical fiber
Circulator, then F-P filter is output to from the C interface of optical fiber circulator；
Step 4: driving voltage digital signal is sent to D/A conversion module by acquisition control module, and D/A conversion module will drive
Dynamic voltage digital signal is converted to driving voltage analog signal, and F-P filter receives the driving voltage of D/A conversion module transmission
Analog signal, be periodically changed F-P cavity length, F-P filter output transmitted light wavelength and driving voltage digital signal at
Linear relationship forms a narrow band filter；
Step 5: photoelectric conversion module carries out the transmission photovoltage of photoelectric conversion to the transmitted light that the F-P filter exports
Transmitted light voltage analog signal is obtained transmitted light voltage digital signal by analog signal, A/D conversion module, and acquisition control module will
Driving voltage digital signal is sent to D/A conversion module, the transmitted light voltage digital signal that acquisition control module acquires this
The transmitted light voltage digital signal of acquisition is compared with the last time, until the transmitted light voltage digital signal of this acquisition is less than
The transmitted light voltage digital signal of last time acquisition, the last time transmitted light voltage digital signal of acquisition is F-P filter
The driving voltage digital signal that last time sends the D/A conversion module is stored in acquisition control by transmitted light voltage max
Molding block is simultaneously sent to the computer module, at this time the reflected light wavelength of sapphire fiber grating sensor and F-P filter
The transmitted light wave length of output is equal.
Step 6: acquisition control module is by driving voltage digital signal corresponding to F-P filter transmission photovoltage maximum value
It is sent to computer module, linear relationship formed by the transmission peak wavelength exported according to driving voltage digital signal and F-P filter
It obtains the transmission peak wavelength of F-P filter, and then obtains the reflection wavelength of sapphire fiber grating sensor, according to obtained by step 2
Model of fit between reflected light wavelength out and temperature obtains temperature information and result is carried out display output.
Preferably, temperature different described in step 1 is T1,T2,...,Tn, blue precious at each temperature described in step 1
The reflection wavelength of stone fiber-optic grating sensor is λ1,λ2,...,λn, temperature TiSapphire fiber grating passes at corresponding each temperature
The reflection wavelength of sensor is λ1λ2...λn, i ∈ [1, n]；
Preferably, varying environment temperature described in step 2 is T1,T2,...,Tn, sapphire light at a temperature of varying environment
The reflection wavelength of fiber grating sensor is λ1,λ2,...,λn；
Model of fit between the reflected light wavelength and temperature of sapphire fiber grating sensor described in step 2 are as follows:
T=K λ+B
Wherein, T is environment temperature, and λ is the reflection wavelength of sapphire fiber grating sensor under environment temperature, and K is ratio
Coefficient, B are deviation ratio；
Preferably, the transmitted light wavelength of the output of F-P filter described in step 6 and the driving of acquisition control module output
Voltage digital signal is linear are as follows:
λ*=LV
Wherein, λ*For the transmitted light wavelength of F-P filter output, L is linear relationship proportionality coefficient, and V is acquisition control mould
The driving voltage digital signal of block output；
If acquisition control module obtains F-P filter transmission photovoltage maximum value V according to step 5max, environment temperature at this time
The transmitted light wavelength X of reflected wavelength lambda and F-P the filter output of lower sapphire fiber grating sensor*It is equal；
Model of fit meter of the temperature information described in step 6 between the reflected light wavelength obtained according to step and temperature
Calculation obtains T=KLV+B, and T is shown by computer module and is exported.
The beneficial effects of the present invention are:
The sensor-based system use sapphire fiber grating sensor, be made of sapphire material, can under high temperature environment into
Detection of the row to temperature.
The sensor-based system uses F-P cavity filter, and fast response time, high sensitivity, diamagnetic field radianting capacity is strong.
The sapphire fiber grating sensor that the sensor-based system uses is encapsulated using boron nitride ceramics, and stability is high, reliably
Property is good, eliminates influence of the external carbuncle to testing result.
The sapphire fiber grating sensor that the sensor-based system uses is small in size, can meet the needs of different operating environment.
The sensor-based system corresponding speed is fast, greatly improves detection efficiency.
Detailed description of the invention
Fig. 1: system for detecting temperature structure chart of the present invention；
Fig. 2: the method for the present invention flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As described in Figure 1, in embodiment of the present invention system technical solution are as follows: one kind be based on sapphire fiber grating sensing
The system for detecting temperature and method of device, comprising: wideband light source, sapphire fiber grating sensor, optical fiber circulator, F-P filtering
Device, photoelectric conversion module, A/D conversion module, acquisition control module, D/A conversion module, computer module；The fiber annular
Device includes tri- interfaces of A, B, C；
The wideband light source is connect with the A interface of the optical fiber circulator by optical fiber；The sapphire fiber grating passes
Sensor is connect with the B interface of the optical fiber circulator by optical fiber；The C interface of the optical fiber circulator and the F-P filter
It is connected by optical fiber；The F-P filter is connect with the photoelectric conversion module by optical fiber；The photoelectric conversion module and institute
A/D conversion module is stated to connect by conducting wire；The A/D conversion module is connect with the acquisition control module by conducting wire；It is described
Acquisition control module is connect with the computer module by conducting wire；The acquisition control module and the D/A conversion module are logical
Cross conducting wire connection；The D/A conversion module is connect with the F-P filter by conducting wire.
The wideband light source, spectral region 240mm-2400mm.
The sapphire fiber grating sensor, inside use sapphire fiber Bragg grating, and outside uses boron nitride
Ceramic sleeve is packaged, and is placed in object to be measured, the temperature in the reflecting light personal attendant external world of sapphire fiber grating sensor
Spend linear change.
The light that the wideband light source issues inputs the optical fiber circulator from the A interface of the optical fiber circulator, from described
The B interface output of optical fiber circulator enters the sapphire fiber grating sensor；The sapphire fiber grating sensor
Reflected light inputs the optical fiber circulator from the B interface of the optical fiber circulator, enters institute from the C interface of the optical fiber circulator
State F-P filter.
The F-P filter for exporting transmitted light to the photoelectric conversion module, the transmitted light wavelength of output with it is described
The driving voltage digital signal of acquisition control module output is linear, if the acquisition control module receives transmission photoelectricity
Digital signal maximum value is pressed, then the transmission of the reflected light wavelength of the sapphire fiber grating sensor and the output of F-P filter
Optical wavelength is equal；
The transmitted light that the photoelectric conversion module is used to export the F-P filter carries out photoelectric conversion and obtains transmitted light
Transmitted light voltage analog signal is transmitted to the A/D conversion module by voltage analog signal；
The A/D conversion module is used to transmitted light voltage analog signal progress analog-to-digital conversion obtaining transmitted light voltage digital
Transmitted light voltage digital signal is transmitted to the acquisition control module by signal；
The acquisition control module is used to send driving voltage digital signal to the D/A conversion module, and this is adopted
The transmitted light voltage digital signal of collection is compared with the transmitted light voltage digital signal of last time acquisition, until this acquisition
Transmitted light voltage digital signal is less than the transmitted light voltage digital signal of last acquisition, the transmission photovoltage number of last time acquisition
Word signal is F-P filter transmission photovoltage maximum value, the driving voltage that the last time sends the D/A conversion module
Digital signal is stored in acquisition control module and is sent to the computer module.
The D/A conversion module is used to the driving voltage digital signal that the acquisition control module exports being converted to driving
Voltage analog signal；
The driving voltage digital signal that the computer module is sent according to the acquisition control module obtains F-P filter
The transmitted light wavelength of output, the reflected light wavelength of a length of sapphire fiber grating sensor of transmitted light wave of F-P filter output,
The computer module is calculated temperature information and exports display according to the model of fit between reflected light wavelength and temperature.
The wideband light source selects SLS201L；0-1800 DEG C of temperature-measuring range of the sapphire fiber grating sensor；It is described
Optical fiber circulator selects Thorlabs 6015-3；The F-P filter selects FFP-TF2；The photoelectric conversion module is selected
KY-PRM-BW-1-D photodetector；The A/D conversion module selects LTC1740；The acquisition control module is selected
spartan3xcs400；The D/A conversion module selects LTC1597；The computer module selects computer terminal.
Below with reference to Fig. 1 to Fig. 2, embodiments of the present invention are introduced.The specific technical solution of embodiment of the present invention is
A kind of sapphire fiber Bragg grating high temp sensitive detection method, the specific steps are as follows:
Step 1: sapphire fiber grating sensor being put into insulating box, sets different temperature and at each temperature
Heat preservation a period of time, the reflection wavelength of sapphire fiber grating sensor at each temperature is detected using spectrometer；
Different temperature described in step 1 is T1,T2,...,Tn, sapphire fiber light at each temperature described in step 1
The reflection wavelength of gate sensor is λ1,λ2,...,λn, temperature TiSapphire fiber grating sensor is anti-at corresponding each temperature
The a length of λ of ejected wave1λ2...λn, i ∈ [1, n]
Step 2: by the reflection wavelength of sapphire fiber grating sensor at a temperature of varying environment temperature and varying environment,
Linear fitting is carried out using least square method, is obtained quasi- between the reflected light wavelength of sapphire fiber grating sensor and temperature
Molding type；
Varying environment temperature described in step 2 is T1,T2,...,Tn, sapphire fiber grating sensing at a temperature of varying environment
The reflection wavelength of device is λ1,λ2,...,λn；
Model of fit between the reflected light wavelength and temperature of sapphire fiber grating sensor described in step 2 are as follows:
T=K λ+B
Wherein, T is environment temperature, and λ is the reflection wavelength of sapphire fiber grating sensor under environment temperature, and K is ratio
Coefficient, B are deviation ratio；
Step 3: sapphire fiber grating sensor being placed in object to be measured, the light beam of wideband light source transmitting is through optical fiber
The A interface of circulator enters optical fiber circulator, then is exported by the B interface of optical fiber circulator, and light beam connects by the B of optical fiber circulator
Mouth enters sapphire fiber grating sensor, and object to be measured can make the reflection of sapphire fiber grating sensor at different temperatures
Optical wavelength changes, and the B interface for passing through optical fiber circulator again from the reflected light of sapphire fiber grating sensor enters optical fiber
Circulator, then F-P filter is output to from the C interface of optical fiber circulator；
Step 4: driving voltage digital signal is sent to D/A conversion module by acquisition control module, and D/A conversion module will drive
Dynamic voltage digital signal is converted to driving voltage analog signal, and F-P filter receives the driving voltage of D/A conversion module transmission
Analog signal, be periodically changed F-P cavity length, F-P filter output transmitted light wavelength and driving voltage digital signal at
Linear relationship forms a narrow band filter；
Step 5: photoelectric conversion module carries out the transmission photovoltage of photoelectric conversion to the transmitted light that the F-P filter exports
Transmitted light voltage analog signal is obtained transmitted light voltage digital signal by analog signal, A/D conversion module, and acquisition control module will
Driving voltage digital signal is sent to D/A conversion module, the transmitted light voltage digital signal that acquisition control module acquires this
The transmitted light voltage digital signal of acquisition is compared with the last time, until the transmitted light voltage digital signal of this acquisition is less than
The transmitted light voltage digital signal of last time acquisition, the last time transmitted light voltage digital signal of acquisition is F-P filter
The driving voltage digital signal that last time sends the D/A conversion module is stored in acquisition control by transmitted light voltage max
Molding block is simultaneously sent to the computer module, at this time the reflected light wavelength of sapphire fiber grating sensor and F-P filter
The transmitted light wave length of output is equal.
Step 6: acquisition control module is by driving voltage digital signal corresponding to F-P filter transmission photovoltage maximum value
Be sent to computer module, the transmission peak wavelength institute that computer module is exported according to driving voltage digital signal and F-P filter at
Linear relationship obtain the transmission peak wavelength of F-P filter, and then obtain the reflection wavelength of sapphire fiber grating sensor, according to
Model of fit between the step 2 reflected light wavelength obtained and temperature obtains temperature information and result is carried out display output.
The transmitted light wavelength of the output of F-P filter described in step 6 and the driving voltage number of acquisition control module output
Signal is linear are as follows:
λ*=LV
Wherein, λ*For the transmitted light wavelength of F-P filter output, L is linear relationship proportionality coefficient, and V is acquisition control mould
The driving voltage digital signal of block output；
If acquisition control module obtains F-P filter transmission photovoltage maximum value V according to step 5max, environment temperature at this time
The transmitted light wavelength X of reflected wavelength lambda and F-P the filter output of lower sapphire fiber grating sensor*It is equal；
Model of fit meter of the temperature information described in step 6 between the reflected light wavelength obtained according to step and temperature
Calculation obtains T=KLV+B, and T is shown by computer module and is exported.
Although wideband light source, sapphire fiber grating sensor, optical fiber circulator, F-P filtering is used more herein
The terms such as device, photoelectric conversion module, A/D conversion module, acquisition control module, D/A conversion module, computer module, but not
A possibility that excluding using other terms.The use of these items is only for more easily describing essence of the invention, it
To be construed to any additional limitation disagreed with spirit of that invention.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (6)
1. a kind of system for detecting temperature based on sapphire fiber grating sensor, comprising: wideband light source, sapphire fiber grating
Sensor, optical fiber circulator, F-P filter, photoelectric conversion module, A/D conversion module, acquisition control module, D/A modulus of conversion
Block, computer module；The optical fiber circulator includes tri- interfaces of A, B, C；
The wideband light source is connect with the A interface of the optical fiber circulator by optical fiber；The sapphire fiber grating sensor
It is connect with the B interface of the optical fiber circulator by optical fiber；The C interface of the optical fiber circulator passes through with the F-P filter
Optical fiber connection；The F-P filter is connect with the photoelectric conversion module by optical fiber；The photoelectric conversion module and the A/
D conversion module is connected by conducting wire；The A/D conversion module is connect with the acquisition control module by conducting wire；The acquisition
Control module is connect with the computer module by conducting wire；The acquisition control module is with the D/A conversion module by leading
Line connection；The D/A conversion module is connect with the F-P filter by conducting wire.
2. the system for detecting temperature according to claim 1 based on sapphire fiber grating sensor, it is characterised in that:
The wideband light source, spectral region 240mm-2400mm；
The sapphire fiber grating sensor, inside use sapphire fiber Bragg grating, and outside uses boron nitride ceramics
Sleeve is packaged, and is placed in object to be measured, the temperature line in the reflecting light personal attendant external world of sapphire fiber grating sensor
Property variation；
The light that the wideband light source issues inputs the optical fiber circulator from the A interface of the optical fiber circulator, from the optical fiber
The B interface output of circulator enters the sapphire fiber grating sensor；The reflection of the sapphire fiber grating sensor
Light inputs the optical fiber circulator from the B interface of the optical fiber circulator, enters the F- from the C interface of the optical fiber circulator
P filter；
The F-P filter is for exporting transmitted light to the photoelectric conversion module, the transmitted light wavelength of output and the acquisition
The driving voltage digital signal of control module output is linear, if the acquisition control module receives transmission photovoltage number
Word signal maximum, the then transmitted light wave that the reflected light wavelength of the sapphire fiber grating sensor and F-P filter export
Length is equal；
The transmitted light that the photoelectric conversion module is used to export the F-P filter carries out photoelectric conversion and obtains transmission photovoltage
Transmitted light voltage analog signal is transmitted to the A/D conversion module by analog signal；
The A/D conversion module is used to transmitted light voltage analog signal progress analog-to-digital conversion obtaining transmitted light voltage digital letter
Number, transmitted light voltage digital signal is transmitted to the acquisition control module；
The acquisition control module is used to send the D/A conversion module driving voltage digital signal, and this is acquired
Transmitted light voltage digital signal is compared with the transmitted light voltage digital signal of last time acquisition, until the transmission of this acquisition
Photovoltage digital signal is less than the transmitted light voltage digital signal of last acquisition, the transmitted light voltage digital letter of last time acquisition
Number being is F-P filter transmission photovoltage maximum value, and the driving voltage that the last time sends the D/A conversion module is digital
Signal is stored in acquisition control module and is sent to the computer module；
The D/A conversion module is used to the driving voltage digital signal that the acquisition control module exports being converted to driving voltage
Analog signal；
The driving voltage digital signal that the computer module is sent according to the acquisition control module obtains the output of F-P filter
Transmitted light wavelength, F-P filter output a length of sapphire fiber grating sensor of transmitted light wave reflected light wavelength, it is described
Computer module is calculated temperature information and exports display according to the model of fit between reflected light wavelength and temperature；
The wideband light source selects SLS201L；0-1800 DEG C of temperature-measuring range of the sapphire fiber grating sensor；The optical fiber
Circulator selects Thorlabs 6015-3；The F-P filter selects FFP-TF2；The photoelectric conversion module selects KY-
PRM-BW-1-D photodetector；The A/D conversion module selects LTC1740；The acquisition control module is selected
spartan3xcs400；The D/A conversion module selects LTC1597；The computer module selects computer terminal.
3. a kind of carried out using the system for detecting temperature described in claim 1 based on sapphire fiber grating sensor based on indigo plant
The temperature checking method of jewel fiber-optic grating sensor, which comprises the following steps:
Step 1: sapphire fiber grating sensor being put into insulating box, different temperature is set and is kept the temperature at each temperature
For a period of time, the reflection wavelength of sapphire fiber grating sensor at each temperature is detected using spectrometer；
Step 2: the reflection wavelength of sapphire fiber grating sensor at a temperature of varying environment temperature and varying environment uses
Least square method carries out linear fitting, obtains the fitting mould between the reflected light wavelength of sapphire fiber grating sensor and temperature
Type；
Step 3: sapphire fiber grating sensor being placed in object to be measured, the light beam of wideband light source transmitting is through fiber annular
The A interface of device enters optical fiber circulator, then is exported by the B interface of optical fiber circulator, light beam by optical fiber circulator B interface into
Enter sapphire fiber grating sensor, object to be measured can make the reflecting light of sapphire fiber grating sensor at different temperatures
Length changes, and the B interface for passing through optical fiber circulator again from the reflected light of sapphire fiber grating sensor enters fiber annular
Device, then F-P filter is output to from the C interface of optical fiber circulator；
Step 4: driving voltage digital signal is sent to D/A conversion module by acquisition control module, and D/A conversion module will drive electricity
Pressure digital signal is converted to driving voltage analog signal, and F-P filter receives the driving voltage simulation of D/A conversion module transmission
Signal, is periodically changed F-P cavity length, and the transmitted light wavelength and driving voltage digital signal of F-P filter output are linear
Relationship forms a narrow band filter；
Step 5: photoelectric conversion module carries out the transmitted light voltage analog of photoelectric conversion to the transmitted light that the F-P filter exports
Transmitted light voltage analog signal is obtained transmitted light voltage digital signal by signal, A/D conversion module, and acquisition control module will drive
Voltage digital signal is sent to D/A conversion module, the transmitted light voltage digital signal that acquisition control module acquires this with it is upper
The transmitted light voltage digital signal of one acquisition is compared, until the transmitted light voltage digital signal of this acquisition is less than upper one
The transmitted light voltage digital signal of secondary acquisition, the last time transmitted light voltage digital signal of acquisition is F-P filter transmission
The driving voltage digital signal that last time sends the D/A conversion module is stored in acquisition control mould by photovoltage maximum value
Block is simultaneously sent to the computer module, and the reflected light wavelength of sapphire fiber grating sensor and F-P filter export at this time
Transmitted light wave length it is equal；
Step 6: acquisition control module sends driving voltage digital signal corresponding to F-P filter transmission photovoltage maximum value
To computer module, linear relationship formed by the transmission peak wavelength exported according to driving voltage digital signal with F-P filter is obtained
The transmission peak wavelength of F-P filter, and then obtain the reflection wavelength of sapphire fiber grating sensor, it is obtained according to step 2
Model of fit between reflected light wavelength and temperature obtains temperature information and result is carried out display output.
4. the temperature checking method according to claim 3 based on sapphire fiber grating sensor, which is characterized in that
Different temperature described in step 1 is T1,T2,...,Tn, sapphire fiber grating passes at each temperature described in step 1
The reflection wavelength of sensor is λ1,λ2,...,λn, temperature TiThe back wave of sapphire fiber grating sensor at corresponding each temperature
A length of λ1λ2...λn, i ∈ [1, n].
5. the temperature checking method according to claim 3 based on sapphire fiber grating sensor, which is characterized in that
Varying environment temperature described in step 2 is T1,T2,...,Tn, sapphire fiber grating sensor at a temperature of varying environment
Reflection wavelength is λ1,λ2,...,λn；
Model of fit between the reflected light wavelength and temperature of sapphire fiber grating sensor described in step 2 are as follows:
T=K λ+B
Wherein, T is environment temperature, and λ is the reflection wavelength of sapphire fiber grating sensor under environment temperature, and K is proportionality coefficient,
B is deviation ratio.
6. the temperature checking method according to claim 3 based on sapphire fiber grating sensor, which is characterized in that
The transmitted light wavelength of the output of F-P filter described in step 6 and the driving voltage digital signal of acquisition control module output
It is linear are as follows:
λ*=LV
Wherein, λ*For the transmitted light wavelength of F-P filter output, L is linear relationship proportionality coefficient, and V is acquisition control module output
Driving voltage digital signal；
If acquisition control module obtains F-P filter transmission photovoltage maximum value V according to step 5max, blue under environment temperature at this time
The transmitted light wavelength X of reflected wavelength lambda and F-P the filter output of jewel fiber-optic grating sensor*It is equal；
Model of fit of the temperature information described in step 6 between the reflected light wavelength obtained according to step and temperature calculates
To T=KLV+B, T is shown by computer module and is exported.
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