CN209264116U - 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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- CN209264116U CN209264116U CN201822162964.2U CN201822162964U CN209264116U CN 209264116 U CN209264116 U CN 209264116U CN 201822162964 U CN201822162964 U CN 201822162964U CN 209264116 U CN209264116 U CN 209264116U
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- photoswitch
- grating
- data acquisition
- detection device
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Abstract
The utility model 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 utility model, which has, to be avoided The advantages that carrying or vibration cause measurement error, and coarse adjustment and fine tuning, which are worked in coordination, improves the resolution ratio of spectrometer, adapt to different demands.
Description
Technical field
The utility model 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.
Utility model content
The purpose of the utility model is to overcome the deficiencies of the prior art, provide a kind of spectral detection based on fiber grating
Device.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
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 controls the photoswitch in t1To tNThe switching of moment optical path, is then controlled
Data collecting card processed is in t1+ Δ t to tN+ time Δt carries out data acquisition, and collected data are saved, wherein Δ t is adjacent
The half of two sampling time intervals.
In a further preferred embodiment, several mobile step distances of the computer control precise translation stage, make each
Raster center wavelength is mobile.
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 utility model 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 the photoswitch in t1To tNThen the switching of moment optical path controls data collecting card in t1+Δt
To tN+ time Δt carries out data acquisition, controls the photoswitch exchange-column shift by computer and controls data collecting card progress
Acquisition, flexible modulation 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.
The utility model is described in further detail with reference to the accompanying drawings and embodiments；But a kind of base of the utility model
It is not limited to the embodiment in the spectrum detection device of fiber grating.
Detailed description of the invention
Fig. 1 is the system block diagram of one preferred embodiment of the utility model；
Fig. 2 is the structural schematic diagram of one preferred embodiment of the utility model.
Specific embodiment
Embodiment, referring to figure 1 and figure 2, a kind of spectrum detection device based on fiber grating of the utility model,
It is adopted including 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
Collect module 60, the grating group 10 include N number of grating 11, be carved with N number of V-groove aluminium block 12, be mounted on same pedestal 70
Automatically controlled accurate translation stage 13 and temperature control module 14, one end of N number of grating 11 is separately fixed on V-groove, the other end
It is separately fixed on accurate translation stage 13, the data acquisition module 60 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 40 to control number
According to the acquisition time of capture card and the switching time of photoswitch 40；The data acquisition module 60 controls accurate translation stage 13 and moves
Dynamic, the aluminium block 12 for being carved with N number of V-groove is mounted on the temperature control module 14, and the data acquisition module 60 connects described
For temperature control module 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
2 ends of circulator 30 connect the input terminal of the photoswitch 40, N number of output end of photoswitch 40 and N number of grating 11 1
End is connected, and the reflected signal of the grating 11 enters 3 ends of optical fiber circulator 30, fiber annular by N number of photoswitch 40
3 ends of device 30 connect the input terminal of the high speed PIN photoelectric detector 50, and 50 output end of high speed PIN photoelectric detector connects
The input terminal of the data acquisition module 60 is connect, the control terminal of data acquisition module 60 connects the switching control of the photoswitch 40
Signal collected on each grating handle and is shown by the display equipment of computer to be measured by end, switching photoswitch 40
20 spectrum of light source.
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；It is answered using the temperature of fiber grating
Become sensitivity characteristic, by the temperature strain of change fiber grating, the reflection kernel wavelength of fiber grating is made to change, it will be to be measured
Optical signal in different wavelength components choose, finally carry out the reduction of measured signal spectrum；What the utility model used
Specific step is 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 the photoswitch 40 in t1 to tNThen the switching of moment optical path controls data collecting card in t1+Δ
t、t2+ Δ t is until tN+ time Δt carries out data acquisition, collected data is saved, Δ t is between the two neighboring sampling time
Every 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 only is used to further illustrate a kind of spectrum detection device based on fiber grating of the utility model,
But the utility model is not limited to embodiment, and made by the above technical examples according to the technical essence of the present invention
What simple modification, equivalent change and modification, each falls in the protection scope of technical solutions of the utility model.
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 2, it is characterised in that: the computer
The photoswitch is controlled 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, collected data are saved, wherein Δ 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.
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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| CN201822162964.2U CN209264116U (en) | 2018-12-21 | 2018-12-21 | A kind of spectrum detection device based on fiber grating |
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| CN201822162964.2U CN209264116U (en) | 2018-12-21 | 2018-12-21 | A kind of spectrum detection device based on fiber grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540293A (en) * | 2018-12-21 | 2019-03-29 | 闽南师范大学 | A kind of spectrum detection device based on fiber grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540293A (en) * | 2018-12-21 | 2019-03-29 | 闽南师范大学 | A kind of spectrum detection device based on fiber grating |
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