CN106595862B - A kind of spectral analysis device using grating to adjustable FP temperature and nonlinear compensation - Google Patents
A kind of spectral analysis device using grating to adjustable FP temperature and nonlinear compensation Download PDFInfo
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- 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
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- 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
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- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
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- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
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- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
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- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
- G01J3/4338—Frequency modulated spectrometry
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- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
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- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
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Abstract
The present invention relates to a kind of spectral analysis device using grating to adjustable FP temperature and nonlinear compensation, the device includes wide spectrum light source, optical modulation module, circulator, grating string, temperature-measuring module, coupler, adjustable FP filtration modules, filtration module, control module and detecting module.Be reference light after the optically modulated module frequency modulation of the optical signal of wide spectrum light source and the selection of grating string wavelength and treat that light-metering is mixed as light all the way, into adjustable FP filtration modules length scanning, by filtration module filtering differentiation reference light with treat light-metering.After inquiring about grating string temperature by temperature-measuring module, control module treats light-metering through reference light and enters trip temperature and nonlinear compensation, and final output treats the precise spectral of light-metering.Compared with prior art, system bulk is small, and integrated level is high, and realizability is good, can remove that adjustable FP filtration modules are non-linear and the influence of temperature simultaneously；Compensation process can automatically process, and realize that dynamic compensates in real time.
Description
Technical field
Present invention design Fibre Optical Sensor and the spectrum analysis field of fiber optic communication, more particularly to use adjustable FP filtration modules
The device of Spectral Characteristics Analysis is carried out to optical signal.
Background technology
In optic communication and light sensing field, the spectrum of optical signal is a highly important information dimension.Optic communication is worked as
In can carry out wavelength-division multiplex using the different wave length of signal, lift the transmission rate and capacity of communication.Permitted among Fibre Optical Sensor
Multisensor such as fiber grating, optical fiber FP interferometers are all based on coding and the demodulation that spectrum carries out heat transfer agent.Therefore it is right
Extremely it is necessary in the accurate of optical signal, high accuracy analysis.
Among optical signal analysis process, the technical indicator of major concern is the wavelength bandwidth that can be analyzed, wavelength resolution
Rate and length scanning speed.Spectrum analysis means based on different technologies, can realize the spectrum analysis of optical signal, but all
There is certain short slab.
The spectrum analysis means of current more main flow are to use the spectral analysis device based on charge coupled cell (CCD),
It is after optical signal is scattered by body grating, the optical signal of different wave length is spatially separated, and by diverse location at
Charge coupled cell is detected, it is possible to achieve detection to different wave length information is so as to realizing the analysis to spectrum.At present
Through there is the AQ6370D spectroanalysis instruments of ripe fixed product such as Yokogawa.But the mode based on CCD, point of its spectrum analysis
Resolution is limited to the scattering power of body grating and the points of CCD detection unit.Therefore in order to realize the spectrum of high-resolution point
Analysis, the volume of spectroanalysis instrument can not reduce, and the device can at most differentiate 20pm spectral signal at present.
Additionally, due to the development of super-narrow line width laser, have benefited from the further reduction of laser linewidth, using scanning laser
Device can also obtain high-precision spectral information.Existing Fourier's mode-locked laser realizes the demodulation to grating spectrum.But
When carrying out spectrum demodulation using scan laser, due to laser at the different wave length it is non-thread in the fluctuation and scanning of light intensity
Property phenomenon, larger distortion be present among spectrum demodulating process.
It is to realize spectrum analysis common method with adjustable FP wave filters, it carries out spectrum point by the way of spectral scan
Analysis, it analyzes bandwidth and wavelength resolution can adjust the voltage range and voltage steps of driving FP wave filters by drive signal
It is adjusted, possesses higher flexibility, can be adjusted and configures with different application demand.And module small volume, light
Spectral resolution is high, has certain advantage compared to aforementioned spectral analysis method.But adjustable FP wave filters are worked as in scanning process
In there are still the phenomenon of scan non-linearity, and to adjustable FP wave filters, there are still larger shadow for the change of ambient temperature
Ring.In order to eliminate the influence of adjustable FP filter temperatures, prior art makes wave filter using the method feedback control of insulating box
Centre wavelength keeps stable, achieves certain effect.But this method is not integrated enough, can not implement among actual use.
For existing nonlinear effect, without integrated level height, simplicity, the solution easily implemented.
The content of the invention
A kind of spectral analysis device using grating to adjustable FP temperature and nonlinear compensation proposed by the present invention, purpose exist
In overcoming the non-linear relation between existing spectral analysis device driving voltage and wavelength based on adjustable FP filtration modules, and filter
Ripple module with temperature fluctuation technical problem.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of spectral analysis device using grating to adjustable FP filtration modules temperature and nonlinear compensation, its feature exist
In, including wide spectrum light source, optical modulation module, circulator, grating string, temperature-measuring module, coupler, adjustable FP filtering mould
Block, filtration module, control module and detecting module；Wherein：
The wide spectrum light source output is connected with optical modulation module input, there is provided wide range optical signal；
The wide range optical signal that the optical modulation module is used to modulate wide spectrum light source feeding is to from treating that light signal is different
On upper frequency, in order to treat light-metering distinguish；
The circulator first port is connected with optical modulation module output end, and circulator second port connects grating string, ring
The port of shape device the 3rd connects coupler；The circulator is used for the light for being sent into first port, is fed to second port and exports, and second
The light that port enters delivers to the 3rd port and is sent to coupler；
Described grating string includes the monochromatic light grid of several different wave lengths, for the wide range for sending circulator second port
Optical signal produces reference optical signal after carrying out wavelength selection, and is reflected back circulator second port；
The coupler includes optical signal input to be measured, reference optical signal input and output end, treats that light signal is defeated
Enter end to be used to receive measured signal, reference optical signal input is connected with the port of circulator the 3rd, and output end filters with adjustable FP
Module is connected；Coupler is used to treat that light signal is mixed with reference optical signal to mix optical signal all the way, is sent into adjustable FP filtering
The input of module；
The adjustable FP filtration modules output end is connected with the input of detecting module, for mixing the feeding of input
After closing light signal carries out length scanning, the optical signal at different wave length is exported, is sent into detecting module；
The detecting module output end is connected with filtration module input, and the light for will be fed into is converted to electric signal, send
To filtration module；
Described filtration module input and the output end of detecting module connect, and its inside is provided with high pass and low pass filtered side by side
Ripple device, it externally has high pass output port and low pass output port, for the low-and high-frequency separation for the signal that will be fed into, respectively by height
Logical output port and low pass output port output；
The control module connects the output end of the high pass of filtration module, LPF output end and temperature-measuring module, point
Reference optical signal Yong Yu not gathered, treat light signal and temperature drift signal；Control module exports the tune for connecing optical modulation module
End processed and the drive end of adjustable FP filtration modules, single frequency sinusoidal modulated signal and triangular voltage sweep signal are exported respectively；Control mould
The peak wavelength of each monochromatic light grid at different temperatures in grating string is stored with block；
During work, the mixing optical signal of adjustable FP filtration modules scanning input, the optical signal of output different wave length point, through visiting
Module detection is surveyed, then is distinguished by filtration module according to frequency height after light signal and reference optical signal, by control module
Collection obtains reference optical signal and treats light intensity value of the light signal at different wave length；Because adjustable FP filtration modules pass through triangle
Ripple scanning signal drives, and often inputs a triangular voltage sweep signal value, can obtain the light intensity of the reference optical signal at a wavelength
It is worth and treats the light intensity value of light signal, therefore the light intensity value of the reference optical signal gathered and the light intensity value and triangular wave for the treatment of light signal
Corresponding relation between scanning signal value is, it is known that according to the corresponding pass between the light intensity value of reference optical signal and triangular voltage sweep signal value
System, can obtain triangular wave drive signal value corresponding to each peak value place of reference optical signal；
Control module obtains the temperature of current raster string by temperature-measuring module, and is deposited according to Current Temperatures inquiry is internal
The exact peak wavelength of each monochromatic light grid in the grating string of storage, each peak of the light intensity value of the reference optical signal of acquisition correspond to
Each monochromatic light grid, therefore can obtain in triangular voltage sweep signal value and light wave long value corresponding to each peak place, further
The transformational relation between triangular voltage sweep signal value and light wave long value can be obtained by calculating；Triangular voltage sweep signal value is turned
Be changed to light wave long value, and treat light signal light intensity value and triangular voltage sweep signal value corresponding relation, it is known that therefore can obtain
Treat light signal light intensity value and light wave long value with corresponding relation, so as to obtain the spectrum for treating light signal；Calculate optical wavelength
Current Temperatures are included in during value, therefore temperature-compensating can be realized.
Further, described control module includes signal generating module, data processing module and data acquisition module；
The data acquisition module includes high pass collection input port, low pass gathers input port, temperature survey collection is defeated
Inbound port, it is respectively used to gather high-frequency signal, low frequency signal and temperature measuring data；
The signal generating module is used to produce single frequency sinusoidal modulated signal and adjusts the triangular voltage sweep letter of FP filtration modules
Number；The data processing module has three inputs, is connected with data acquisition module, receives high-pass filtering, low pass respectively
Filtering and temperature measuring data；Data processing module output end is connected with signal generating module, and module output occurs for control signal
Single-frequency modulated signal and triangular voltage sweep signal；During work, data processing module is looked into according to the temperature of the grating string currently measured
The light wave long value of each grating in grating string is ask, according to triangular voltage sweep signal value and the corresponding relation of reference optical signal light intensity value
Triangular voltage sweep signal value at each single grating peak of inquiry, and then obtain triangular voltage sweep letter at each monochromatic light grid reflection peak
The corresponding relation of number value and wavelength value, and calculates the transformational relation between triangular voltage sweep signal value and light wave long value, obtains
Treat the corresponding relation between light signal light intensity value and wavelength value, output temperature and the optical signal spectrum to be measured after nonlinear compensation.
Further, frequency of the frequency than treating light signal of the single-frequency modulated signal of described driving optical modulation module
It is high so that reference optical signal possesses higher frequency feature；
Further, the monochromatic light grid for several different wave lengths that described grating string includes, each monochromatic light grid are fixed
On same hard plate material, vibration isolation measure is taken to the sheet material, the stress being subject to completely cut off grating influences with what is vibrated；Simultaneously
The temperature of each monochromatic light grid and the relation of peak wavelength have been completed in advance, and are stored in data processing module；
The number of preferable grating should be no less than two, and optimal raster count is 4；
Further, described temperature-measuring module, grating string grating string nearby is placed on, for monitoring grating string
Temperature change.
Further, the process of the transformational relation between described calculating triangular voltage sweep signal value and light wave long value is：
The temperature measured first according to temperature-measuring module, leads to the data of storage inside, and inquiry obtains each monochromatic light in current raster string
The exact peak wavelength of grid；Pass through the corresponding pass between the light intensity value and triangular voltage sweep signal value of the reference optical signal of acquisition
System, obtains triangular voltage sweep signal value corresponding at each monochromatic light grid reflection peak；At the monochromatic light grid reflection peak to acquisition
Light wave long value and triangular voltage sweep signal value carry out multistage fitting of a polynomial, obtain triangular voltage sweep signal value and light wave long value it
Between corresponding relation；Preferably, if the number of grating is n herein, n-1 rank multinomials fitting algorithm can be used to be fitted.
Acquired corresponding relation has been included in current environmental temperature, and the method for employing multinomial nonlinear fitting, therefore right by this
It should be related to that the light wave long value being calculated has eliminated the influence of ambient temperature and wave filter nonlinear scanning.
The present invention compared with prior art, mainly with following advantage：
1st, adjustable FP filtration modules used, grating string and temperature-measuring module etc. are all the moulds that small volume is easily integrated
Block, therefore, system bulk are small, and integrated level is high, and realizability is good.
2nd, system can remove non-linear and temperature influence simultaneously by the compensation of grating string and obtain higher precision
Spectrum.
3rd, compensation process all automatically processes in processing terminal, and carrying out dynamic in real time to analysis spectrum every time compensates.
Brief description of the drawings
Fig. 1 is system and device block diagram；
Fig. 2 is the internal structure of control module；
Fig. 3 is the temperature wavelength plot schematic diagram of single grating；
Fig. 4 is the triangular voltage sweep signal value and reference optical signal light intensity value obtained and treated between light signal light intensity value
Corresponding relation；
Fig. 5 is the method signal that more rank multinomial nonlinear fittings obtain triangular voltage sweep signal value and optical wavelength relation
Figure；
In all of the figs, identical reference is used for representing identical element or structure, wherein：Treat that light signal is sent out
Generating apparatus (1), wide spectrum light source (2), optical modulation module (3), circulator (4), grating string (5), temperature-measuring module (6), coupling
Clutch (7), adjustable FP filtration modules (8), filtration module (9), control module (10) and detecting module (11)；Signal generating module
(12), data processing module (13), data acquisition module (14)；Reference optical signal light intensity value (15), treat light signal light intensity value
(16)。
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Specific embodiment is combined in next step, the present invention is expanded on further：
Adjustable FP wave filters are similar with tunable laser, and spectrum analysis is carried out by the way of spectral scan, its analytic band
Wide and wavelength resolution can be adjusted by adjusting the voltage range for driving FP wave filters and voltage steps, be possessed higher
Flexibility, it can be adjusted and configure with different application demand, and module small volume, spectral resolution are high.But adjustable FP
Wave filter is there are still the phenomenon of scan non-linearity among scanning process, and the change of ambient temperature filters to adjustable FP
There are still large effect for device.
Spectrum analysis is carried out based on adjustable FP wave filters the invention provides one kind and enters trip temperature and non-using grating string
The device of linear compensation, its specific implementation process are as follows.
The implementation device needed in implementation process has：One spectrum covering 1530nm-1560nm ASE wide spectrum light sources, light
Intensity modulator, circulator, grating string, thermo-sensitive resistor and its drive device, 1：1 coupler, three dB bandwidth is adjustable for 16pm's
Detector that FP wave filters, detective bandwidth are 0-100MHz, filtration module include the low pass that a low pass is 1kHz by frequency
The wave filter of filtration module and a high pass by frequency for 5kHz high-pass filtering module.Control module is used as data by one
The FPGA module of processing module, a 100MHz D/A module that module occurs as triangular signal, one is adopted as data
Collect module 100MHz A D data acquisition modules composition.
Wherein, 4 monochromatic light grid are contained inside grating string, the reflectivity of 4 gratings is 10%, reflection kernel wavelength difference
For 1535nm, 1540nm, 1545nm and 1555nm, four gratings are fixed on a steel material hardboard, and make shock insulation processing.
The reflection peak wavelengths of each monochromatic light grid are only affected by temperature, and are linear relationship between temperature, some light
Grid reflection peak wavelengths and temperature relation are as shown in Figure 3.
Thermo-sensitive resistor is then close to the placement of grating string, monitors the change of grating string environment temperature.
ASE wide spectrum light sources, output signal are the wide range optical signal of a direct current.
The direct current optical signal that FPGA module is inputted wide spectrum light source by D/A module drives light intensity modulator, is modulated to
10kHz sinusoidal variations optical signal, the optical signal after modulation are reflected after optical circulator by grating string.
Therefore by the output of the port of circulator the 3rd be that a frequency is 10kHz, centered on spectrum 1535nm,
The reference optical signal of 1540nm, 1545nm and 1555nm or so reflection peak；
Treat optical signal of the light signal for approximate DC, and be coupled into reference optical signal by coupler same
In one light path.
FPGA module control D/A output triangular voltage sweep signals drive adjustable FP wave filters to carry out length scanning, because of triangle
Ripple scanning signal is that system control produces, therefore known to triangular voltage sweep signal value.
Optical signal passes through adjustable FP filter scans, and electric signal is converted to by detector, then after filtering the high pass of device and
Low-pass filtering module distinguish after, by A D-module gather, be sent into FPGA module among.The reference optical signal difference ripple collected
Strong point light intensity value and treat relation such as Fig. 4 institutes between the light intensity value at light signal different wave length and triangular voltage sweep signal value
Show.The scope of triangular voltage sweep signal is 0-1V.A triangular voltage sweep signal value is often inputted to adjustable FP wave filters, passes through A/
D can obtain the reference optical signal light intensity value at a wavelength from high/low bandpass filter port processing and treat light signal light intensity
Value, after triangular voltage sweep signal value and obtained light intensity value are drawn as shown in Figure 4.Obtaining triangular voltage sweep signal value
After corresponding relation between light intensity value, then triangular voltage sweep signal value is converted into wavelength value, you can obtain spectrum.
Simultaneously FPGA module by A D-module to gather thermo-sensitive resistor voltage to obtain Current Temperatures be 35 degree, inquiry is internal in advance
The relation of monochromatic light grid peak wavelength and temperature in the grating string first stored, now the exact peak wavelength of four gratings be
1535.1nm, 1539.5nm, 1545.05nm and 1555.2nm.
In addition, pass through the corresponding relation in Fig. 4, it can be appreciated that the triangular voltage sweep signal corresponding to each reflection peak
It is worth for 0.437V, 0.493V, 0.548V and 0.656V.
And then we can be obtained when triangular voltage sweep signal value is that to correspond to light wave long value be 1535.1nm to 0.437V；
0.493V corresponds to light wave long value 1539.5nm；0.548V corresponds to light wave long value 1545.05nm；0.656V corresponds to light wave long value
1555.2nm。
Next relation such as Fig. 5 institutes between triangular voltage sweep signal value and optical wavelength are obtained using the fitting of three rank multinomials
Show, the relational expression for being fitted conversion is：
λ=- 3.429 × V3+15.97×V2+77.06×V+1499
Wherein, λ is light wave long value, and V is triangular voltage sweep signal value.Can be by the triangular wave in Fig. 4 by the relational expression
Scanning signal value is converted to light wave long value, realizes the accurate acquisition of optical signal spectrum to be measured.
Meanwhile each spectrum analysis is all fitted and reacquires the relational expression, due to the optical grating reflection peak being fitted
The light wave long value at place is the exact value obtained by temperature inquiry, therefore the relational expression eliminates influence caused by temperature fluctuation；
The nonlinear compensation of adjustable FP wave filters is enough realized using three rank multinomial nonlinear fitting and cans.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (7)
1. a kind of spectral analysis device using grating to adjustable FP temperature and nonlinear compensation, it is characterised in that including wide range
Light source (2), optical modulation module (3), circulator (4), grating string (5), temperature-measuring module (6), coupler (7), adjustable FP
Filtration module (8), filtration module (9), control module (10) and detecting module (11)；Wherein：
Wide spectrum light source (2) output is connected with optical modulation module (3) input, there is provided wide range optical signal；
The wide range optical signal that the optical modulation module (3) is used to modulate wide spectrum light source (2) feeding is to from treating that light signal is different
Upper frequency on, in order to treat light-metering distinguish；
Circulator (4) first port is connected with optical modulation module (3) output end, and circulator second port connects grating string
(5), the port of circulator the 3rd connects coupler (7)；The circulator (4) is used for the light for being sent into first port, is fed to second
Port exports, and the light that second port enters delivers to the 3rd port and is sent to coupler (7)；
Described grating string (5) includes the monochromatic light grid of several different wave lengths, for the width for sending circulator (4) second port
Spectrum optical signal produces reference optical signal after carrying out wavelength selection, and is reflected back circulator (4) second port；The temperature survey mould
Block (6) is used for the temperature for obtaining current raster string (5)；
The coupler (7) includes optical signal input to be measured, reference optical signal input and output end, treats that light signal inputs
Hold for receiving measured signal, reference optical signal input is connected with the port of circulator (4) the 3rd, and output end filters with adjustable FP
Module (8) is connected；Coupler (7) is used to treat that light signal is mixed with reference optical signal to mix optical signal all the way, is sent into adjustable
The input of FP filtration modules (8)；
Adjustable FP filtration modules (8) output end is connected with the input of detecting module (11), the adjustable FP filtration modules
(8) it is used for after being inputted the mixing optical signal progress length scanning being sent at end, exports the optical signal at different wave length, be sent into and visit
Survey module (11)；
Detecting module (11) output end is connected with filtration module (9) input, and the light for will be fed into is converted to electric signal,
Deliver to filtration module (9)；
Described filtration module (9) input is connected with the output end of detecting module (11), and it is internal arranged side by side provided with high pass and low
Bandpass filter, it externally has high pass output port and low pass output port, for the low-and high-frequency separation for the signal that will be fed into, difference
Exported by high pass output port and low pass output port；
The control module (10) connects the output of the high pass of filtration module (9), LPF output end and temperature-measuring module (6)
End, it is respectively used to gather reference optical signal, treats light signal and temperature drift signal；Control module (10) output connects optical modulation
The drive end of the modulated terminal of module (3) and adjustable FP filtration modules (8), export single frequency sinusoidal modulated signal respectively and triangular wave is swept
Retouch signal；The peak wavelength of each monochromatic light grid at different temperatures in grating string (5) is stored with control module (10).
2. spectral analysis device according to claim 1, it is characterised in that during work, adjustable FP filtration modules (8) scanning
The mixing optical signal of input, different wave length optical signal is exported, detected through detecting module (11), module (9) is according to frequency after filtering
Rate height is distinguished after light signal and reference optical signal, is gathered by control module (10) and is obtained reference optical signal and treat that light-metering is believed
Light intensity value number at different wave length；Because adjustable FP filtration modules are driven by triangular voltage sweep signal, one three is often inputted
Angle ripple scanning signal value, it can obtain the light intensity value of the reference optical signal at a wavelength and treat the light intensity value of light signal, therefore adopt
The light intensity value of the reference optical signal of collection and corresponding relation between the light intensity value of light signal and triangular voltage sweep signal value is treated, it is known that root
According to the corresponding relation between the light intensity value and triangular voltage sweep signal value of reference optical signal, can obtain at each peak value of reference optical signal
Corresponding triangular wave drive signal value；
Control module (10) obtains the temperature of current raster string (5) by temperature-measuring module (6), and is inquired about according to Current Temperatures
The exact peak wavelength of each monochromatic light grid in the grating string of storage inside, each peak of the light intensity value of the reference optical signal of acquisition is
Each monochromatic light grid are correspond to, therefore can be obtained in triangular voltage sweep signal value and light wave long value corresponding to each peak place, are entered
The transformational relation that can be obtained by calculating between triangular voltage sweep signal value and light wave long value of one step；Triangular voltage sweep is believed
Number value is converted to light wave long value, and treat light signal light intensity value and triangular voltage sweep signal value corresponding relation, it is known that therefore may be used
With obtain treat light signal light intensity value and light wave long value with corresponding relation, so as to obtain the spectrum for treating light signal；Calculate
Current Temperatures are included in during light wave long value, therefore temperature-compensating can be realized.
3. spectral analysis device according to claim 1 or 2, it is characterised in that described control module (10) includes letter
Number module (12), data processing module (13) and data acquisition module (14) occurs；
The data acquisition module (14) includes high pass collection input port, low pass gathers input port, temperature survey collection is defeated
Inbound port, it is respectively used to gather high-frequency signal, low frequency signal and temperature measuring data；
The signal generating module (12) is used to produce single frequency sinusoidal modulated signal and the triangular wave of adjustable FP filtration modules (8) is swept
Retouch signal；The data processing module (13) has three inputs, is connected with data acquisition module (14), receives respectively high
Frequency signal, low frequency signal and temperature measuring data；Data processing module (13) output end is connected with signal generating module (12), control
Signal generating module (12) output single-frequency modulated signal processed and triangular voltage sweep signal；During work, data processing module (13) root
According to the temperature of the grating string currently measured, the light wave long value of each grating in inquiry grating string, according to triangular voltage sweep signal value
Corresponding relation inquiry each triangular voltage sweep signal value at single grating peak, and then obtain every with reference optical signal light intensity value
Triangular voltage sweep signal value and the corresponding relation of wavelength value at individual monochromatic light grid reflection peak, and calculate triangular voltage sweep signal value with
Transformational relation between light wave long value, obtain and treat corresponding relation between light signal light intensity value and wavelength value, output temperature with it is non-
Optical signal spectrum to be measured after linear compensation.
4. spectral analysis device according to claim 1 or 2, it is characterised in that described driving optical modulation module (3)
Single-frequency modulated signal frequency it is higher than the frequency for treating light signal so that reference optical signal possesses higher frequency feature.
5. spectral analysis device according to claim 1, it is characterised in that described grating string (5) include several
The monochromatic light grid of different wave length, each monochromatic light grid are fixed on same hard plate material, and vibration isolation measure is taken to the sheet material, with
Isolation grating by stress and vibration influenceed；The temperature of each monochromatic light grid and the relation of peak wavelength have been tested in advance simultaneously
Finish, and be stored in data processing module (13).
6. spectral analysis device according to claim 1, it is characterised in that described temperature-measuring module, be placed on
Near grating string, for monitoring the temperature change of grating string.
7. spectral analysis device according to claim 3, it is characterised in that described calculating triangular voltage sweep signal value with
Conversion regime between light wave long value is：The temperature measured first according to temperature-measuring module (6), passes through the number of storage inside
According to inquiry obtains the exact peak wavelength of each monochromatic light grid in current raster string；Pass through the light intensity value of the reference optical signal of acquisition
With the corresponding relation between triangular voltage sweep signal value, triangular voltage sweep signal corresponding at each monochromatic light grid reflection peak is obtained
Value；Multistage fitting of a polynomial is carried out by the light wave long value at the monochromatic light grid reflection peak to acquisition and triangular voltage sweep signal value,
Obtain the corresponding relation between triangular voltage sweep signal value and light wave long value；If the number of grating is n herein, can use
N-1 rank multinomials fitting algorithm is fitted；Acquired corresponding relation has been included in current environmental temperature, and it is non-thread to employ multinomial
Property fitting method, therefore to have eliminated ambient temperature non-with wave filter for the light wave long value being calculated by the corresponding relation
The influence of linear scan.
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| CN104215605A (en) * | 2014-02-12 | 2014-12-17 | 中科融通物联科技无锡有限公司 | Method for fast dynamic-calibration of fiber bragg grating (FBG) demodulation system |
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| US7119325B2 (en) * | 2003-01-27 | 2006-10-10 | Bookham Technology Plc | System and method for monitoring environmental effects using optical sensors |
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| US6327036B1 (en) * | 1996-10-18 | 2001-12-04 | Micron Optics, Inc. | Fabry Perot/fiber Bragg grating multi-wavelength reference |
| CN104215605A (en) * | 2014-02-12 | 2014-12-17 | 中科融通物联科技无锡有限公司 | Method for fast dynamic-calibration of fiber bragg grating (FBG) demodulation system |
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