CN109540293A - A kind of spectrum detection device based on fiber grating - Google Patents
A kind of spectrum detection device based on fiber grating Download PDFInfo
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- CN109540293A CN109540293A CN201811577202.7A CN201811577202A CN109540293A CN 109540293 A CN109540293 A CN 109540293A CN 201811577202 A CN201811577202 A CN 201811577202A CN 109540293 A CN109540293 A CN 109540293A
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- photoswitch
- grating
- data acquisition
- detection device
- acquisition module
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- 238000001228 spectrum Methods 0.000 title claims abstract description 26
- 239000000835 fiber Substances 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 238000013519 translation Methods 0.000 claims description 22
- 239000004411 aluminium Substances 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000003595 spectral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of spectrum detection devices based on fiber grating, it includes grating group, light source to be measured, optical fiber circulator, 1 × N photoswitch, photodetector and data acquisition module, the light source output optical signal to be measured enters 1 end of optical fiber circulator, 2 ends of optical fiber circulator connect the input terminal of the photoswitch, N number of output end of photoswitch is connected with described N number of grating one end, the signal that optical grating reflection is returned enters 3 ends of optical fiber circulator by photoswitch, the input terminal of the 3 ends connection photodetector of optical fiber circulator, the input terminal of photodetector output end connection data acquisition module, the switching control end of the control terminal connection photoswitch of data acquisition module, signal collected on each grating is handled and shows the signal of light source light spectrum to be measured by switching photoswitch, the present invention, which has, to avoid carrying or shake The advantages that dynamic to cause measurement error, coarse adjustment and fine tuning, which are worked in coordination, improves the resolution ratio of spectrometer, adapts to different demands.
Description
Technical field
The present invention relates to a kind of spectrum detection devices based on fiber grating.
Background technique
Spectrometer is the scientific instrument by the photodegradation of complicated component for spectrum line, is made of prism or diffraction grating etc.,
It can measure the light of body surface reflection using spectrometer；Crawl, display and analysis by spectrometer to optical information, to survey
Know that, containing which kind of element in article, this technology is widely used in air pollution, water pollution, food hygiene, metal industry
Deng detection in；Currently used spectrometer working principle be typically all by diffraction grating by the spectral line of different wave length spatially
It separates, the spectral line of different wave length is irradiated into photodiode array, handles to obtain light source light spectrum to be measured by follow-up signal.This
Kind spectrometer strictly puts each key modules, once spectrometer occurs to carry or vibrate, easily causes measurement error, influences
System worked well；Therefore, it is necessary to a kind of reasonable schemes to solve the above problems.
Summary of the invention
It is an object of the invention to overcome the deficiency of the prior art, provides a kind of spectral detection dress based on fiber grating
It sets.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of spectrum detection device based on fiber grating, it is characterised in that: it includes grating group, light source to be measured, optical fiber
Circulator, 1 × N photoswitch, photodetector and data acquisition module, the grating group include N number of grating, are carved with N number of V-type
The aluminium block of slot, the automatically controlled accurate translation stage and temperature control module being mounted on same pedestal, one end of N number of grating are solid respectively
It being scheduled on V-groove, the other end is separately fixed on accurate translation stage, and the data acquisition module controls accurate translation stage movement,
The aluminium block for being carved with N number of V-groove is mounted on the temperature control module, the data acquisition module connect the temperature control module with
Aluminium block temperature is controlled, the light source output optical signal to be measured enters 1 end of optical fiber circulator, and 2 ends of optical fiber circulator connect institute
The input terminal of photoswitch is stated, N number of output end of photoswitch is connected with described N number of grating one end, the letter that the optical grating reflection is returned
Number enter 3 ends of optical fiber circulator by photoswitch, 3 ends of optical fiber circulator connect the input terminal of the photodetector, institute
The input terminal that photodetector output end connects the data acquisition module is stated, the control terminal of data acquisition module connects the light
Signal collected on each grating is handled and shows light source light to be measured by the switching control end of switch, switching photoswitch
Spectrum, wherein N ∈ N*。
In a further preferred embodiment, the data acquisition module includes data collecting card and computer, the data
Voltage signal is converted into digital signal by capture card, and the computer connects the data collecting card and photoswitch to control data
The acquisition time of capture card and the switching time of photoswitch.
In a further preferred embodiment, the computer includes the display equipment to show light source light spectrum to be measured.
In a further preferred embodiment, the computer control photoswitch is in t1To tNThe switching of moment optical path, then controls number
According to capture card in t1+ Δ t to tN+ time Δt carries out data acquisition, and collected data are saved, wherein Δ t is two neighboring
The half of sampling time interval.
In a further preferred embodiment, several mobile step distances of the computer control precise translation stage, make each
Raster center wavelength is mobile, certain wave-length coverage of described several the mobile step distances of precision translation stage to scan.
In a further preferred embodiment, the computer connects the temperature control module and is further controlled with controlling temperature control module
Aluminium block temperature, the computer control the aluminium block temperature change, keep each raster center wavelength mobile.
In a further preferred embodiment, the photodetector is high speed PIN photoelectric detector.
In a further preferred embodiment, one end of N number of output end of the photoswitch and the fixed V-groove of N number of grating
It is connected
The beneficial effects of the present invention are:
1, one end of N number of grating is separately fixed on V-groove, and the other end is separately fixed on accurate translation stage, V-groove
Aluminium block is mounted on temperature control module, and accurate translation stage and temperature control module are mounted on same pedestal simultaneously, is avoided carrying or be shaken
It is dynamic to cause measurement error, influence system worked well；It is mobile to control accurate translation stage by data acquisition module, stretch grating with
The reflection kernel wavelength of coarse adjustment grating controls temperature control module temperature further with the reflection of fine tuning grating by data acquisition module
Central wavelength, coarse adjustment and fine tuning, which are worked in coordination, improves the resolution ratio of spectrometer, adapts to the test scene of different demands；All -fiber knot
The volume and cost of device can be effectively controlled in structure, advantages of simple.
2, computer connection data collecting card and photoswitch are to control the acquisition time of data collecting card and cutting for photoswitch
The time is changed, different testing requirements is adapted to.
3, computer includes to show that the display equipment fast and easy of light source light spectrum to be measured obtains spectral information.
4, computer controls photoswitch in t1To tNThen the switching of moment optical path controls data collecting card in t1+ Δ t to tN+
Time Δt carries out data acquisition, passes through computer and controls photoswitch exchange-column shift and control data collecting card and be acquired, flexibly
Adjust collection period.
5, by several mobile step distances of computer control precise translation stage, keep each raster center wavelength mobile,
Realize the coarse adjustment of raster center wavelength, computer controls temperature control module and changes aluminium block temperature, and then finely changes the reflection of grating
Central wavelength is conducive to carry out Precision measurement to a certain wave-length coverage.
6, using high speed PIN photoelectric detector, structure is simple, has excellent performance.
7, N number of output end of photoswitch is connected with one end of the fixed V-groove of N number of grating, avoids photoswitch with essence
The movement of close translation stage and move, be further ensured that the mounting stability for the other equipment being connected with photoswitch.
Invention is further described in detail with reference to the accompanying drawings and embodiments；But one kind of the invention is based on optical fiber light
The spectrum detection device of grid is not limited to the embodiment.
Detailed description of the invention
Fig. 1 is the system block diagram of a preferred embodiment of the present invention；
Fig. 2 is the structural schematic diagram of a preferred embodiment of the present invention.
Specific embodiment
Embodiment, referring to figure 1 and figure 2, a kind of spectrum detection device based on fiber grating of the invention comprising
Grating group 10, light source to be measured 20, optical fiber circulator 30,1 × N photoswitch 40, high speed PIN photoelectric detector 50 and data acquisition module
Block 60, the grating group 10 include N number of grating 11, the aluminium block 12 for being carved with N number of V-groove, the electricity being mounted on same pedestal 70
One end of the accurate translation stage 13 and temperature control module 14 of control, N number of grating 11 is separately fixed on V-groove, other end difference
It is fixed on accurate translation stage 13, the data acquisition module 60 includes data collecting card and computer, the data acquisition
Voltage signal is converted into digital signal by card, and the computer connects the data collecting card and photoswitch 40 is adopted with controlling data
The acquisition time of truck and the switching time of photoswitch 40；The data acquisition module 60 controls the accurate movement of translation stage 13, institute
It states and is carved with the aluminium block 12 of N number of V-groove and is mounted on the temperature control module 14, the data acquisition module 60 connects the temperature control mould
For block 14 to control 12 temperature of aluminium block, 20 output optical signal of light source to be measured enters 1 end of optical fiber circulator 30, optical fiber circulator
30 2 ends connect the input terminal of the photoswitch 40, and N number of output end of photoswitch 40 is connected with described N number of 11 one end of grating, institute
State 3 ends that the reflected signal of grating 11 enters optical fiber circulator 30 by N number of photoswitch 40,3 ends of optical fiber circulator 30
The input terminal of the high speed PIN photoelectric detector 50 is connected, 50 output end of high speed PIN photoelectric detector connects the data
The input terminal of acquisition module 60, the control terminal of data acquisition module 60 connect the switching control end of the photoswitch 40, switch light
Signal collected on each grating handle and shows 20 light of light source to be measured by the display equipment of computer by switch 40
Spectrum.
Currently, fiber grating reflection kernel wavelength bandwidth can accomplish that 0.1nm is even lower, the elongation strain coefficient of grating is about
1.2pm/ μ ε is drifted about by stretching the central wavelength for making 100 μ ε of grating generation about can produce 0.12nm；Temperature-sensitivity coefficient is about
It is 11pm/ DEG C, grating temperature is every to change 1 DEG C of central wavelength drift that can produce 0.011nm；Utilize the temperature strain of fiber grating
Sensitivity characteristic makes the reflection kernel wavelength of fiber grating change by the temperature strain of change fiber grating, will be to be measured
Different wavelength components choose in optical signal, finally carry out the reduction of measured signal spectrum；The specific step that the present invention uses
It is rapid as follows:
1, computer control precise translation stage 13 fixes translation position, and control temperature control module 14 keeps 12 temperature of aluminium block permanent
It is fixed.
2, computer controls photoswitch 40 in t1 to tNThen the switching of moment optical path controls data collecting card in t1+Δt、t2
+ Δ t is until tN+ time Δt carries out data acquisition, and collected data are saved, and Δ t is two neighboring sampling time interval
Half, N ∈ N*。
3, the mobile step distance of computer control precise translation stage 13 makes in grating group 10 cardiac wave in each grating 11
Long movement, repeats step 2.
4, step 3 is repeated, until the wave-length coverage of scanning terminates.
5, Precision measurement if desired is carried out to a certain wave-length coverage, computer control precise translation stage 13 is moved to the wavelength
Near, computer controls temperature control module 14 and changes 12 temperature of aluminium block, and then finely changes the reflection kernel wavelength of grating, to aluminium block
After 12 temperature are stablized, Computercontrolled data acquisition card acquires data.
6, the data of preservation are depicted as the spectrogram of measured signal and are shown by the display equipment of computer.
Above-described embodiment is only used to further illustrate a kind of spectrum detection device based on fiber grating of the invention, but this
Invention be not limited to embodiment, according to the technical essence of the invention it is to the above embodiments it is any it is simple modification,
Equivalent variations and modification, fall within the scope of protection of technical solution of the present invention.
Claims (8)
1. a kind of spectrum detection device based on fiber grating, it is characterised in that: it includes grating group, light source to be measured, fiber optic loop
Shape device, 1 × N photoswitch, photodetector and data acquisition module, the grating group include N number of grating, are carved with N number of V-groove
Aluminium block, the automatically controlled accurate translation stage and temperature control module that is mounted on same pedestal, one end of N number of grating is fixed respectively
On V-groove, the other end is separately fixed on accurate translation stage, and the data acquisition module controls accurate translation stage movement, institute
It states and is carved with the aluminium block of N number of V-groove and is mounted on the temperature control module, the data acquisition module connects the temperature control module to control
Aluminium block temperature processed, the light source output optical signal to be measured enter 1 end of optical fiber circulator, described in the 2 ends connection of optical fiber circulator
The input terminal of photoswitch, N number of output end of photoswitch are connected with described N number of grating one end, the signal that the optical grating reflection is returned
Enter 3 ends of optical fiber circulator by photoswitch, 3 ends of optical fiber circulator connect the input terminal of the photodetector, described
Photodetector output end connects the input terminal of the data acquisition module, and the control terminal of data acquisition module connects the light and opens
The switching control end of pass switches photoswitch for signal collected on each grating and is handled and shown light source light spectrum to be measured,
Wherein, N ∈ N*。
2. a kind of spectrum detection device based on fiber grating according to claim 1, it is characterised in that: the data
Acquisition module includes data collecting card and computer, and voltage signal is converted into digital signal, the meter by the data collecting card
Calculation machine connects the data collecting card and photoswitch to control the acquisition time of data collecting card and the switching time of photoswitch.
3. a kind of spectrum detection device based on fiber grating according to claim 2, it is characterised in that: the computer
Including the display equipment to show light source light spectrum to be measured.
4. a kind of spectrum detection device based on fiber grating according to claim 1, it is characterised in that: the computer
Photoswitch is controlled in t1To tNThen the switching of moment optical path controls data collecting card in t1+ △ t to tN+ △ t moment carries out data
Acquisition, collected data are saved, wherein △ t is the half of two neighboring sampling time interval.
5. a kind of spectrum detection device based on fiber grating according to claim 2, it is characterised in that: the computer
Several mobile step distances of accurate translation stage are controlled, keep each raster center wavelength mobile, if the precision translation stage is mobile
Dry certain wave-length coverage of the step distance to scan.
6. a kind of spectrum detection device based on fiber grating according to claim 2, it is characterised in that: the computer
The temperature control module is connected to control temperature control module and further control aluminium block temperature, the computer controls the aluminium block temperature and becomes
Change, keeps each raster center wavelength mobile.
7. a kind of spectrum detection device based on fiber grating according to claim 1, it is characterised in that: the photoelectricity
Detector is high speed PIN photoelectric detector.
8. a kind of spectrum detection device based on fiber grating according to claim 1, it is characterised in that: the photoswitch
N number of output end be connected with one end of the fixed V-groove of the N number of grating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811577202.7A CN109540293A (en) | 2018-12-21 | 2018-12-21 | A kind of spectrum detection device based on fiber grating |
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| CN201811577202.7A CN109540293A (en) | 2018-12-21 | 2018-12-21 | A kind of spectrum detection device based on fiber grating |
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Cited By (3)
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| CN112254934A (en) * | 2020-10-20 | 2021-01-22 | 武汉一三光电科技有限公司 | Bidirectional test system and method for fiber grating filter |
| CN113632143A (en) * | 2020-09-08 | 2021-11-09 | 深圳市海谱纳米光学科技有限公司 | Method and device for restoring and reconstructing light source spectrum based on hyperspectral image |
| CN114295322A (en) * | 2021-12-09 | 2022-04-08 | 武汉锐科光纤激光技术股份有限公司 | Grating test system, method, device, storage medium and electronic device |
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| CN113632143A (en) * | 2020-09-08 | 2021-11-09 | 深圳市海谱纳米光学科技有限公司 | Method and device for restoring and reconstructing light source spectrum based on hyperspectral image |
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| CN113632143B (en) * | 2020-09-08 | 2023-09-26 | 深圳市海谱纳米光学科技有限公司 | Method and device for restoring and reconstructing light source spectrum based on hyperspectral image |
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| CN114295322B (en) * | 2021-12-09 | 2024-01-26 | 武汉锐科光纤激光技术股份有限公司 | Grating test system, method and device, storage medium and electronic device |
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