CN117490740A - Fiber bragg grating adjustment method and system - Google Patents
Fiber bragg grating adjustment method and system Download PDFInfo
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- 238000007781 pre-processing Methods 0.000 claims abstract description 16
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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- G01D5/38—Forming the light into pulses by diffraction gratings
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Abstract
The invention provides a fiber bragg grating mediation method and a system, wherein the method comprises the following steps: obtaining initial data by converting the optical signal to be detected; sequentially preprocessing initial data to obtain preparation data, wherein the preparation data comprises a plurality of sections of pulse signals, and the sections of pulse signals are fitted to form a curve; acquiring a peak position from the curve, and acquiring an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength; when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be obtained, the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured are selected, and interpolation calculation is carried out on the measured wavelength corresponding to the time to be measured and the etalon wavelength of the specified peak position to obtain the actual wavelength value of the pulse signal to be measured. Through the method and the device, the adjustment operation is simplified, the corresponding equipment cost is reduced, and meanwhile the adjustment precision is improved.
Description
Technical Field
The invention relates to the field of structure monitoring equipment, in particular to a fiber bragg grating modulation method and a fiber bragg grating modulation system.
Background
With the rapid development and construction of the infrastructure of bridges, tunnels and the like in China, the application of the structural safety monitoring system is wider, wherein the fiber bragg grating technology is also applied in the field, and the matched mediation equipment is also generated.
At present, the functional requirements of the structure monitoring industry on the mediation equipment are gradually increased, and the main functions of the conventional fiber bragg grating mediation equipment are designed through ARM, DSP and other architectures, so that the technology is complex and the cost is high.
Disclosure of Invention
Based on the above, the invention aims to provide a fiber bragg grating modulation method and a fiber bragg grating modulation system, so as to solve the defects in the prior art.
In order to achieve the above object, the present invention provides a fiber bragg grating tuning method, the method comprising:
obtaining initial data by converting the optical signal to be detected;
preprocessing the initial data in sequence to obtain preparation data, wherein the preparation data comprises a plurality of sections of pulse signals, and a curve is formed by fitting the plurality of sections of pulse signals;
acquiring a peak position from the curve, and acquiring an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength;
when the actual wavelength value of a pulse signal to be measured corresponding to the time to be measured is required to be obtained, the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured are selected, and interpolation calculation is carried out on the measured wavelength corresponding to the time to be measured and the etalon wavelengths of the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured;
wherein the step of obtaining the etalon wavelength at the peak position based on the theoretical data comprises:
judging whether the peak position is normal or not according to the peak distance of the etalon;
and when the peak position is normal, acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM, and pairing the peak position and the etalon wavelength one by one according to a time parameter to form the etalon data.
Preferably, the pretreatment includes:
sequentially performing filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
performing Gaussian fitting on a plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
and storing the peak position in the graph into a data buffer.
Preferably, the step of acquiring valid peak data based on the comparison result includes:
when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value, judging that the intermediate pulse signal is an effective pulse signal;
and when the wavelength value corresponding to the intermediate pulse signal is larger than or equal to the real-time average value, judging that the intermediate pulse signal is an invalid pulse signal.
Preferably, the expression of the interpolation calculation is as follows:
；
wherein,for the measurement wavelength corresponding to the time to be measured, +.>And->Etalon wavelength for two of said specified peak positions,/->For the time to be measured，/>And->And respectively acquiring time corresponding to the two specified peak positions.
Preferably, the step of obtaining initial data by converting the optical signal to be measured includes:
converting the optical signal to be detected into a voltage signal through a photoelectric conversion circuit;
and acquiring and converting the voltage signals through an ADC (analog-to-digital converter) to obtain initial data.
In order to achieve the above object, the present invention further provides a system for tuning a fiber grating, the system comprising:
the conversion module is used for obtaining initial data by converting the optical signal to be detected;
the preprocessing module is used for sequentially preprocessing the initial data to obtain preliminary data, wherein the preliminary data comprises a plurality of sections of pulse signals, and a curve is formed by fitting the plurality of sections of pulse signals;
the acquisition module is used for acquiring a peak position from the curve and acquiring an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength;
the calculation module is used for selecting the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be obtained, and carrying out interpolation calculation on the measurement wavelength corresponding to the time to be measured and the etalon wavelengths of the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured;
wherein, the acquisition module includes:
the judging unit is used for judging whether the peak position is normal or not according to the peak distance of the etalon;
and the pairing unit is used for acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM when the peak position is normal, and pairing the peak position and the etalon wavelength one by one according to a time parameter so as to form the etalon data.
Preferably, the preprocessing module includes:
the processing unit is used for sequentially carrying out filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
the average unit is used for calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
the fitting unit is used for carrying out Gaussian fitting on the plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
and the storage unit is used for storing the peak position in the graph into the data buffer.
Preferably, the mean unit includes:
the first judging subunit is used for judging that the intermediate pulse signal is an effective pulse signal when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value;
and the second judging subunit is used for judging that the intermediate pulse signal is an invalid pulse signal when the wavelength value corresponding to the intermediate pulse signal is more than or equal to the real-time average value.
The beneficial effects of the invention are as follows: the method comprises the steps of converting an optical signal to be measured to obtain initial data, preprocessing the initial data to obtain preliminary data, connecting a plurality of pulse signals in the preliminary data to form a curve, acquiring peak positions from the curve, acquiring the etalon wavelength at the peak positions based on theoretical data, selecting the etalon wavelength at a specified peak position adjacent to the pulse signal to be measured when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be acquired, and then carrying out interpolation calculation on the measured wavelength corresponding to the time to be measured and the etalon wavelengths at two specified peak positions so as to calculate the actual wavelength value of the pulse signal to be measured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flowchart of a fiber grating tuning method according to a first embodiment of the present invention;
fig. 2 is a block diagram of a fiber grating modulation method according to a second embodiment of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a flowchart of a fiber grating tuning method according to a first embodiment of the present invention is shown in fig. 1, and the fiber grating tuning method includes the following steps:
step S101, obtaining initial data by converting an optical signal to be detected;
the obtained optical signal to be measured needs to be converted into a voltage signal through the photoelectric conversion circuit, and then is collected and converted into initial data through an analog-to-digital converter (ADC) for subsequent processing, and it can be understood that the ADC refers to a device for converting a continuously-changed analog signal into a discrete digital signal, so that the initial data is of a digital signal type.
Step S102, preprocessing the initial data in sequence to obtain preparation data, wherein the preparation data comprises a plurality of sections of pulse signals, and a curve is formed by fitting the plurality of sections of pulse signals;
the preprocessing comprises data filtering, signal amplitude limiting, average value, peak value interception, gaussian fitting and peak value storage. Specifically, the data filtering: filtering burrs and high-frequency noise; clipping: the voltage and the background noise of the super-amplitude are removed, the real-time average and the time delay alignment are carried out, and the method is used for obtaining the real-time average value of the signal, and it can be understood that the real-time average value can generate clock time delay, and the time delay alignment module is used for processing the original signal so as to synchronize the original signal with the average value, so that the amplitude limiting treatment is needed; peak value interception: comparing the real-time average value with the original signal, screening out the signal which is larger than the average line, and obtaining effective peak value data through peak value judgment; gaussian fitting: carrying out Gaussian fitting on the peak data to find the peak position; peak value storage: all peak positions of the channel are stored in a FIFO (First Input First Output, first-in first-out data buffer).
It can be understood that the initial data needs to be preprocessed before calculating the actual wavelength value of the pulse signal to be measured, if step S102 is skipped, since the data size of the peak segment is large and most of the data is redundant data, the adjustment speed is affected and resources are wasted, so that step S102 is an indispensable step.
Step S103, obtaining a peak position from the curve, and obtaining an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength;
wherein, any point in the curve is matched with the corresponding acquisition time and measurement wavelength, and the peak position is also matched with the corresponding acquisition time and measurement wavelength.
The collection time is used as a screening parameter, so that a theoretical wavelength at the same time is selected from the theoretical data, and the theoretical wavelength is used as an etalon wavelength of the collection time.
Step S104, when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be obtained, the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured are selected, and interpolation calculation is carried out on the measured wavelength corresponding to the time to be measured and the etalon wavelengths of the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured.
Through the steps, the initial data are obtained by converting the optical signals to be tested, then the initial data are preprocessed to obtain the preparation data, a plurality of pulse signals in the preparation data are connected to form a curve, the peak position is obtained from the curve, the etalon wavelength at the peak position is obtained based on the theoretical data, when the actual wavelength value of the pulse signals to be tested corresponding to the time to be tested is required to be obtained, the etalon wavelength at the appointed peak position adjacent to the pulse signals to be tested is selected, and then the measured wavelength corresponding to the time to be tested and the etalon wavelengths at the two appointed peak positions are subjected to interpolation calculation to calculate the actual wavelength value of the pulse signals to be tested.
In some embodiments, the step of obtaining the initial data by converting the optical signal to be measured includes:
converting the optical signal to be detected into a voltage signal through a photoelectric conversion circuit;
and acquiring and converting the voltage signals through an ADC (analog-to-digital converter) to obtain initial data.
The optical signals to be detected are processed by the ADC, a plurality of initial pulse signals are still obtained, and the initial pulse signals form the initial data.
In some of these embodiments, the preprocessing comprises:
sequentially performing filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
the filtering and signal clipping operations in step S102 correspond to filtering the glitches and high-frequency noise in the initial data, and then removing the super-amplitude voltage and the background noise to perform real-time averaging and delay alignment, so as to obtain the corresponding real-time average value of the intermediate data.
Calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
wherein a calculation expression for calculating the real-time average value is as follows:
；
for the real-time average, +.>For the ith intermediate pulse signal in the intermediate dataWavelength value of>Is the total number of intermediate pulse signals in the intermediate data.
It should be noted that, the step corresponds to the peak value intercepting operation in step S102, the real-time average value is compared with the wavelength value of the original signal, and the peak value position corresponding to the wavelength value smaller than the real-time average value is screened out, so as to obtain effective peak value data, where the original signal is an intermediate pulse signal in the intermediate data.
Performing Gaussian fitting on a plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
the step corresponds to the gaussian fitting operation in step S102, and gaussian fitting is performed on the effective peak data, so as to obtain a graph of the acquisition time and the measurement wavelength, and the corresponding graph, so as to find the peak position.
The peak searching precision in the adjustment process can be improved by obtaining a corresponding curve through Gaussian fitting and finding the peak position by using the curve.
And storing the peak position in the graph into a data buffer.
Wherein, this step corresponds to the peak storing operation in step S102, that is, all the peak positions are stored in the FIFO (First Input First Output, first-in first-out data buffer), and it can be understood that each peak position is matched with a corresponding acquisition time and measurement wavelength.
In some embodiments, the step of obtaining valid peak data based on the comparison result comprises:
when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value, judging that the intermediate pulse signal is an effective pulse signal;
and when the wavelength value corresponding to the intermediate pulse signal is larger than or equal to the real-time average value, judging that the intermediate pulse signal is an invalid pulse signal.
In some of these embodiments, the step of obtaining an etalon wavelength at the peak position based on theoretical data comprises:
judging whether the peak position is normal or not according to the peak distance of the etalon;
when the distance between adjacent peak positions is smaller than the peak distance of the etalon, judging that the peak positions are abnormal, discarding abnormal data, then collecting the data again, and when the continuous collection is still abnormal for 5 times, reporting the last abnormal data to avoid dead circulation.
When the distance between the adjacent peak positions is larger than or equal to the peak distance of the etalon, judging that the peak positions are normal, so as to ensure that the wavelength sequence obtained by actual measurement can be aligned with the wavelength sequence of the etalon in the theoretical data.
And when the peak position is normal, acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM, and pairing the peak position and the etalon wavelength one by one according to a time parameter to form the etalon data.
The ROM is a Read-Only Memory, theoretical data are stored in advance, and the etalon wavelength corresponding to each acquisition time is searched from the theoretical data.
In some of these embodiments, the expression of the interpolation calculation is as follows:
；
wherein,for the measurement wavelength corresponding to the time to be measured, +.>And->Etalon wavelength for two of said specified peak positions,/->For the time to be measured->And->And respectively acquiring time corresponding to the two specified peak positions.
In one embodiment, the fiber grating mediation method uses the time corresponding to each pulse peak value to calculate the wavelength value measured by the measuring fiber grating sensor (Fiber Bragg Grating, FBG). I.e. known to measure FBG peak timeReference is made to the peak time of the respective etalon>、/>、/>、…、/>，/>∈（/>、/>、/>、…、/>) Reference FBG wavelength, etalon peak wavelength; the wavelength value measured by the measurement FBG is calculated. The method comprises the following steps:
1) Searching and findingThe two closest etalon peak times.
2) Searching wavelength values corresponding to all moments according to the product information of the etalon and the relation between the output peak time of the etalon and the FBG peak time、/>、/>、…、/>。
3) Interpolation calculation
If find outThe closest etalon peak time is +.>、/>The corresponding wavelength is->、/>The linear interpolation formula is as follows:
；
the center wavelength of the measured FBG is calculated by using a linear difference formula as follows:
；
the change in wavelength corresponds to the deformation of the grating caused by other physical quantities, and is converted into a value of the measured physical quantity.
It should be noted that the steps illustrated in the above-described flow or flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
The second embodiment of the present application further provides a fiber bragg grating mediation system, which is used for implementing the first embodiment and the preferred embodiment, and the description is omitted herein. As used below, the terms "module," "unit," "sub-unit," and the like may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 2 is a block diagram of a fiber grating mediation system according to a second embodiment of the present invention, as shown in fig. 2, the system includes:
the conversion module 10 is used for obtaining initial data by converting the optical signal to be detected;
the preprocessing module 20 is configured to sequentially preprocess the initial data to obtain preliminary data, where the preliminary data includes a plurality of segments of pulse signals, and the segments of pulse signals are fitted to form a curve;
an acquisition module 30, configured to acquire a peak position from the curve, and acquire an etalon wavelength at the peak position based on theoretical data, where the peak position matches a corresponding acquisition time and measurement wavelength;
the calculation module 40 is configured to select the etalon wavelengths at two specified peak positions adjacent to the pulse signal to be measured when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be obtained, and perform interpolation calculation on the measured wavelength corresponding to the time to be measured and the etalon wavelengths at the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured.
Through the steps, the initial data are obtained by converting the optical signals to be tested, then the initial data are preprocessed to obtain the preparation data, a plurality of pulse signals in the preparation data are connected to form a curve, the peak position is obtained from the curve, the etalon wavelength at the peak position is obtained based on the theoretical data, when the actual wavelength value of the pulse signals to be tested corresponding to the time to be tested is required to be obtained, the etalon wavelength at the appointed peak position adjacent to the pulse signals to be tested is selected, and then the measured wavelength corresponding to the time to be tested and the etalon wavelengths at the two appointed peak positions are subjected to interpolation calculation to calculate the actual wavelength value of the pulse signals to be tested.
In some of these embodiments, the conversion module 10 includes:
the first conversion unit is used for converting the optical signal to be detected into a voltage signal through the photoelectric conversion circuit;
the second conversion unit is used for acquiring and converting the voltage signals through the ADC to obtain initial data.
In some of these embodiments, the preprocessing module 20 includes:
the processing unit is used for sequentially carrying out filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
the average unit is used for calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
the fitting unit is used for carrying out Gaussian fitting on the plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
and the storage unit is used for storing the peak position in the graph into the data buffer.
In some of these embodiments, the mean unit comprises:
the first judging subunit is used for judging that the intermediate pulse signal is an effective pulse signal when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value;
and the second judging subunit is used for judging that the intermediate pulse signal is an invalid pulse signal when the wavelength value corresponding to the intermediate pulse signal is more than or equal to the real-time average value.
In some of these embodiments, the acquisition module 30 includes:
the judging unit is used for judging whether the peak position is normal or not according to the peak distance of the etalon;
and the pairing unit is used for acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM when the peak position is normal, and pairing the peak position and the etalon wavelength one by one according to a time parameter so as to form the etalon data.
In some of these embodiments, the expression of the interpolation calculation is as follows:
；
wherein,for the measurement wavelength corresponding to the time to be measured, +.>And->Etalon wavelength for two of said specified peak positions,/->For the time to be measured->And->And respectively acquiring time corresponding to the two specified peak positions.
The functions or operation steps implemented when the above modules and units are executed are substantially the same as those in the above method embodiments, and are not described herein again.
The fiber grating mediation system provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment portion is not mentioned.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (6)
1. A method of fiber grating mediation, the method comprising:
obtaining initial data by converting the optical signal to be detected;
preprocessing the initial data in sequence to obtain preparation data, wherein the preparation data comprises a plurality of sections of pulse signals, and a curve is formed by fitting the plurality of sections of pulse signals;
acquiring a peak position from the curve, and acquiring an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength;
when the actual wavelength value of a pulse signal to be measured corresponding to the time to be measured is required to be obtained, the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured are selected, and interpolation calculation is carried out on the measured wavelength corresponding to the time to be measured and the etalon wavelengths of the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured;
wherein the preprocessing comprises:
sequentially performing filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
performing Gaussian fitting on a plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
storing the peak position in the graph in a data buffer;
the step of obtaining an etalon wavelength at the peak position based on the theoretical data comprises:
judging whether the peak position is normal or not according to the peak distance of the etalon;
and when the peak position is normal, acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM, and pairing the peak position and the etalon wavelength one by one according to a time parameter to form the etalon data.
2. The fiber bragg grating mediation method of claim 1, wherein the step of obtaining effective peak data based on the comparison result includes:
when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value, judging that the intermediate pulse signal is an effective pulse signal;
and when the wavelength value corresponding to the intermediate pulse signal is larger than or equal to the real-time average value, judging that the intermediate pulse signal is an invalid pulse signal.
3. The fiber bragg grating mediation method of claim 1, wherein the interpolation is calculated as follows:
；
wherein,for the measurement wavelength corresponding to the time to be measured, +.>And->Etalon wavelength for two of said specified peak positions,/->For the time to be measured->And->And respectively acquiring time corresponding to the two specified peak positions.
4. The fiber bragg grating tuning method of claim 1, wherein the step of obtaining the initial data by converting the optical signal to be measured includes:
converting the optical signal to be detected into a voltage signal through a photoelectric conversion circuit;
and acquiring and converting the voltage signals through an ADC (analog-to-digital converter) to obtain initial data.
5. A fiber grating tuning system, the system comprising:
the conversion module is used for obtaining initial data by converting the optical signal to be detected;
the preprocessing module is used for sequentially preprocessing the initial data to obtain preliminary data, wherein the preliminary data comprises a plurality of sections of pulse signals, and a curve is formed by fitting the plurality of sections of pulse signals;
the acquisition module is used for acquiring a peak position from the curve and acquiring an etalon wavelength at the peak position based on theoretical data, wherein the peak position is matched with corresponding acquisition time and measurement wavelength;
the calculation module is used for selecting the etalon wavelengths of two specified peak positions adjacent to the pulse signal to be measured when the actual wavelength value of the pulse signal to be measured corresponding to the time to be measured is required to be obtained, and carrying out interpolation calculation on the measurement wavelength corresponding to the time to be measured and the etalon wavelengths of the two specified peak positions to obtain the actual wavelength value of the pulse signal to be measured;
wherein, the preprocessing module includes:
the processing unit is used for sequentially carrying out filtering and amplitude limiting processing on the initial data to obtain intermediate data, wherein the intermediate data comprises a plurality of intermediate pulse signals;
the average unit is used for calculating a real-time average value of the wavelength values of the intermediate pulse signals, comparing the real-time average value with the wavelength values corresponding to the intermediate pulse signals, and acquiring effective peak value data based on a comparison result, wherein the effective peak value data comprises a plurality of effective pulse signals;
the fitting unit is used for carrying out Gaussian fitting on the plurality of effective pulse signals to obtain a graph of acquisition time and measurement wavelength;
a storage unit for storing the peak position in the graph in a data buffer;
the acquisition module comprises:
the judging unit is used for judging whether the peak position is normal or not according to the peak distance of the etalon;
and the pairing unit is used for acquiring the etalon wavelength at the same time based on theoretical data pre-stored in the ROM when the peak position is normal, and pairing the peak position and the etalon wavelength one by one according to a time parameter so as to form the etalon data.
6. The mediation system of fiber gratings as recited in claim 5, wherein said means for averaging includes:
the first judging subunit is used for judging that the intermediate pulse signal is an effective pulse signal when the wavelength value corresponding to the intermediate pulse signal is smaller than the real-time average value;
and the second judging subunit is used for judging that the intermediate pulse signal is an invalid pulse signal when the wavelength value corresponding to the intermediate pulse signal is more than or equal to the real-time average value.
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| CN108896078A (en) * | 2018-04-04 | 2018-11-27 | 天津大学 | Fiber bragg grating weak signal demodulation method based on detector time domain response |
| CN111854814A (en) * | 2020-08-17 | 2020-10-30 | 江西飞尚科技有限公司 | Multifunctional fiber grating demodulator and demodulation method thereof |
| WO2022157740A1 (en) * | 2021-01-25 | 2022-07-28 | Marcel Schemmann | Fiber bragg grating sensor system |
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| CN104111082A (en) * | 2014-07-11 | 2014-10-22 | 中南大学 | High-precision FBG sensing signal peak searching method |
| CN108896078A (en) * | 2018-04-04 | 2018-11-27 | 天津大学 | Fiber bragg grating weak signal demodulation method based on detector time domain response |
| CN111854814A (en) * | 2020-08-17 | 2020-10-30 | 江西飞尚科技有限公司 | Multifunctional fiber grating demodulator and demodulation method thereof |
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