CN113701791B - Method for coding and identifying displacement by utilizing resonance spectrum of SNAP structure microcavity - Google Patents
Method for coding and identifying displacement by utilizing resonance spectrum of SNAP structure microcavity Download PDFInfo
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- CN113701791B CN113701791B CN202110919041.0A CN202110919041A CN113701791B CN 113701791 B CN113701791 B CN 113701791B CN 202110919041 A CN202110919041 A CN 202110919041A CN 113701791 B CN113701791 B CN 113701791B
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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
- G01D5/347—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 using displacement encoding scales
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Abstract
The invention discloses a method for coding and identifying displacement by utilizing resonance spectrum of a SNAP structure microcavity, which comprises the following steps of S1, moving the SNAP structure microcavity along the axial direction of the SNAP structure microcavity and keeping contact with a coupling waveguide to generate coupling, and recording resonance spectrums on nodes at different positions; s2, converting each resonant wavelength into a standard bar code; s3, inputting the obtained standard bar codes into a library to obtain standard bar code libraries of different coupling positions of the SNAP structure microcavity and the coupling waveguide; s4, converting the resonance spectrum of the coupling position to be detected into a bar code to be detected according to the content of the step S2; s5, encoding the bar codes to be detected and the bar codes in the standard bar code library to form a signal matrix; s6, comparing the bar code to be detected with a signal matrix of a standard bar code in a standard bar code library, and searching out the maximum value in the cross correlation coefficient matrix, wherein the displacement represented by the standard bar code corresponding to the maximum value is the actual displacement of the bar code to be detected.
Description
Technical Field
The invention belongs to the technical field of optical sensing, and particularly relates to a method for coding and identifying displacement by utilizing a resonance spectrum of a SNAP structure microcavity.
Background
In recent years, the optical microcavity sensing technology has been unique in the leading edge research of biosensing, precise measurement and the like by virtue of the advantages of ultra-high sensitivity, no need of marks, quick response, easy integration and the like. The whispering gallery mode microcavity is used as a high-performance optical resonant cavity, has great potential in the displacement sensing field, and can reach sub-nanometer resolution and millimeter-level measuring range theoretically. The existing displacement sensing scheme based on the whispering gallery mode microcavity mainly utilizes the change of coupling conditions caused by microcavity deformation, and realizes displacement sensing by measuring the wavelength displacement offset and the transmittance change of a single resonant mode.
However, this method has the following disadvantages: 1. is easily influenced by the fluctuation of the external temperature; 2. when the characteristic parameters such as the Q value, the transmittance and the like are obtained from the resonance spectrum, a series of operations are needed, so that the calculated amount of the test system is increased, and the running speed of the test system is reduced; 3. only the relative displacement of the displacement sensing system can be measured, and it is difficult to track the absolute displacement variation of the sensor.
Disclosure of Invention
The present invention aims to solve the above problems, and provides a method for encoding and identifying displacement by using a resonance spectrum of a SNAP structure microcavity. According to the method, resonance wavelength and transmittance information of each order of axial mode in a resonance spectrum of the SNAP structure microcavity are encoded into the bar code, and the correlation degree of the bar code to be detected and the standard bar code is calculated by using a cross correlation function method, so that the microcavity displacement can be rapidly and accurately identified.
The aim of the invention can be achieved by adopting the following technical scheme:
a method for encoding and identifying displacement using a resonance spectrum of a SNAP-structure microcavity, comprising the steps of:
s1, utilizing a displacement sensing system of a SNAP structure microcavity, axially moving the SNAP structure microcavity along the SNAP structure microcavity and keeping contact with a coupling waveguide to generate coupling, and recording resonance spectrums on nodes at different positions;
s2, taking the position of each resonant wavelength in the resonant spectrum as the central position of a black bar code, wherein the width of the black bar code corresponds to the transmittance of each resonant mode, so that the recorded resonant spectrum is converted into a standard bar code;
s3, inputting the obtained standard bar codes into a library to obtain standard bar code libraries of different coupling positions of the SNAP structure microcavity and the coupling waveguide;
s4, converting the resonance spectrum of the coupling position to be detected into a bar code to be detected according to the content of the step S2;
s5, encoding black bar codes of bar codes to be detected and bar codes in a standard bar code library into a plurality of 1S, encoding blank bar codes into a plurality of 0S, and enabling each bar code to form a signal matrix consisting of 0S and 1S;
s6, comparing the bar code to be detected with a signal matrix of a standard bar code in a standard bar code library, and searching out the maximum value in the cross correlation coefficient matrix, wherein the displacement represented by the standard bar code corresponding to the maximum value is the actual displacement of the bar code to be detected.
Further, the specific content of step S6 is as follows:
and calculating the cross correlation coefficient of the signal matrix x (t) of the bar code to be detected and the signal matrix y (t) of each standard bar code by using a cross correlation function method to form a cross correlation coefficient matrix.
Further, the displacement range of the displacement node of the resonance spectrum in the step S1 is 0-200 μm.
As a preferred scheme, the displacement nodes are 1200, and 1200 standard bar codes are formed.
Further, the displacement sensing system comprises a tunable laser, a coupling waveguide, a SNAP structure microcavity and a photoelectric detector; the SNAP structure microcavity is contacted with the coupling waveguide to be coupled, the generated optical signals are output from the output end of the coupling waveguide, the resonance spectrum is obtained by detection of a photoelectric detector, the position of each resonance wavelength in the resonance spectrum is used as the center position of a black bar code, the width of the black bar code corresponds to the transmittance of each resonance mode, and the black bar code is converted into a standard bar code or a bar code to be detected.
Further, the cross-correlation function expression is:
wherein T is the sample observation time, tau is the time shift, x (T) is the matrix signal of the bar code to be detected, and y (T) is the matrix signal of the standard bar code.
The implementation of the invention has the following beneficial effects:
1. the invention utilizes a photoelectric detector to measure the optical signal output by a coupling waveguide coupled to a SNAP structure microcavity to obtain a resonance spectrum; because the resonance spectrums of different coupling positions are unique, the resonance wavelength and transmittance information of each order axial mode in the resonance spectrums of the SNAP structure microcavity can be encoded into a bar code, and the correlation degree of the bar code to be detected and the standard bar code is calculated by using a cross correlation function method so as to achieve the rapid and accurate identification of microcavity displacement, thereby solving the problem that the prior art can only acquire relative displacement according to the resonance peak offset and cannot acquire absolute displacement.
2. Based on the mode spectrum structure characteristics of the SNAP structure microcavity, the invention utilizes the characteristic that the displacement change can cause the change of the characteristic parameters of each axial mode of the SNAP structure microcavity, and establishes a standard bar code library by encoding the obtained resonance spectrum, thereby effectively reducing the influence of external environmental factors such as temperature fluctuation and the like on the sensing precision, and simultaneously, the resonance spectrum obtained from the extraction system is clean and regular, thereby being beneficial to the rapid and accurate encoding and identification of bar codes.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a displacement sensing system utilizing the method of encoding and identifying displacement using the resonance spectrum of a SNAP structural microcavity in accordance with the present invention.
FIG. 2 is a schematic representation of the structure of a converted standard bar code of the method of the present invention for encoding and identifying displacements using the resonance spectrum of a SNAP structure microcavity.
FIG. 3 is a schematic diagram of a SNAP structure microcavity of the present invention with its distance of axial movement being zero, using the resonance spectrum of the SNAP structure microcavity to encode and identify displacements.
Fig. 4 is a schematic diagram of the shift resonance spectrum acquired in fig. 3.
FIG. 5 is a schematic diagram of a SNAP structure microcavity of the method of encoding and identifying displacements using the resonance spectrum of the SNAP structure microcavity of the present invention, moving a distance of 50 microns in the axial direction of the SNAP structure microcavity.
Fig. 6 is a schematic diagram of the shift resonance spectrum acquired in fig. 5.
FIG. 7 is a schematic diagram of a SNAP structure microcavity of the method of encoding and identifying displacements using the resonance spectrum of the SNAP structure microcavity of the present invention, moving axially by itself a distance of 100 microns.
Fig. 8 is a schematic diagram of the shift resonance spectrum acquired in fig. 7.
FIG. 9 is a schematic diagram of a cross-correlation calculation of a bar code to be detected and a standard bar code in a standard bar code library by using a method for encoding and identifying displacement by using a resonance spectrum of a SNAP structure microcavity.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1 to 8, the present embodiment relates to a method for encoding and identifying displacement by using resonance spectrum of SNAP structure microcavity, comprising the following steps:
s1, utilizing a displacement sensing system of a SNAP structure microcavity, axially moving the SNAP structure microcavity along the SNAP structure microcavity and keeping contact with a coupling waveguide to generate coupling, and recording resonance spectrums on nodes at different positions;
s2, taking the position of each resonant wavelength in the resonant spectrum as the central position of a black bar code, wherein the width of the black bar code corresponds to the transmittance of each resonant mode, so that the recorded resonant spectrum is converted into a standard bar code; the resulting standard bar code is referred to as the standard bar code where the SNAP-structured microcavity is located relative to the coupling waveguide.
S3, inputting the obtained standard bar codes into a library to obtain standard bar code libraries of different coupling positions of the SNAP structure microcavity and the coupling waveguide;
s4, converting the resonance spectrum of the coupling position to be detected into a bar code to be detected according to the same rule of the step S2;
s5, coding black barcodes of barcodes to be detected and barcodes in a standard barcode library into a plurality of 1 according to a certain resolution, and coding blank barcodes into a plurality of 0, so that each barcode forms a signal matrix consisting of 0 and 1;
s6, comparing the bar code to be detected with a signal matrix of a standard bar code in a standard bar code library. And calculating the cross correlation coefficient of the signal matrix x (t) of the bar code to be detected and the signal matrix y (t) of each standard bar code by using a cross correlation function method to form a cross correlation coefficient matrix. And searching out the maximum value in the cross-correlation coefficient matrix, wherein the displacement represented by the standard bar code corresponding to the maximum value is the actual displacement of the bar code to be detected.
The cross-correlation function expression is:
wherein T is the sample observation time, tau is the time shift, x (T) is the matrix signal of the bar code to be detected, and y (T) is the matrix signal of the standard bar code.
Specifically, fig. 1 is a schematic structural diagram of a displacement sensing system of a SNAP-structure microcavity for acquiring a resonance spectrum according to the present invention. The displacement sensing system comprises a tunable laser 1, a coupling waveguide 2, a SNAP structure microcavity 3 and a photoelectric detector 4; the SNAP structure microcavity 3 is contacted with the coupling waveguide 2 to be coupled, the generated optical signals are output from the output end of the coupling waveguide 2, the resonance spectrum is obtained by detection of the optical signals through the photoelectric detector 4, the position of each resonance wavelength in the resonance spectrum is used as the center position of a black bar code through the computer 40, the width of the black bar code corresponds to the transmittance of each resonance mode, and the black bar code is converted into a standard bar code or a bar code 5 to be detected.
Fig. 2 is a standard bar code. Converted to standard bar codes according to the following rules: taking the position of each resonant wavelength in the resonant spectrum as the central position of a black bar code, wherein the width of the black bar code corresponds to the transmittance of each resonant mode, so that the resonant spectrum is converted into a standard bar code;
as shown in fig. 3 to 8, the SNAP-structure microcavity moves axially along itself and keeps contact with the coupling waveguide to generate coupling, resonance spectra on nodes at different positions are recorded, the displacement range is 0-200 μm, and since the SNAP-structure microcavity is of a symmetrical structure, only half of the displacements can be measured, and the number of the displacement nodes is 1200.
And converting the acquired resonance spectrum of the 1200 displacement nodes into a standard bar code according to the rule. The 1200 standard bar codes are warehousing standard bar codes of 1200 different coupling positions where the SNAP structure microcavity is coupled with the coupling waveguide.
And converting the resonance spectrum corresponding to the coupling position to be detected into a bar code to be detected according to the rule.
And (3) coding the black bar codes of the bar codes to be detected and all the standard bar codes in the standard bar code library into a plurality of 1 s according to a certain resolution, coding the blank bar codes into a plurality of 0 s, and forming a signal matrix consisting of 0 s and 1 s by each bar code.
FIG. 9 is a schematic diagram showing the cross-correlation calculation of a bar code to be detected and a standard bar code in a standard bar code library in the present invention. And comparing the signal matrix of the bar code to be detected with 1200 warehousing standard bar code signal matrices of a standard bar code library, and performing cross-correlation calculation to obtain a cross-correlation coefficient matrix, wherein as shown in fig. 4, three correlation coefficients 0.9870, 0.8867 and 0.7604 are marked respectively, and obviously, the maximum cross-correlation coefficient is 0.9870, and the displacement represented by the corresponding standard bar code 1 is the displacement represented by the bar code to be detected.
Based on the mode spectrum structure characteristics of the SNAP structure microcavity, the method utilizes the characteristic that the displacement change can cause the change of the characteristic parameters of each axial mode of the SNAP structure microcavity, and establishes a standard bar code library by using the obtained resonance spectrum codes, so that the influence of external environmental factors such as temperature fluctuation on the sensing precision can be effectively reduced, and meanwhile, the resonance spectrum obtained from the extraction system is clean and regular, thereby being beneficial to the coding and identification of bar codes. Because the spectrum coding is a better coding method easy to identify, and the bar codes are a better description mode for single physical quantity, each bar code can distinguish each displacement according to the unique WGM resonance spectrum, the method is simple and easy to implement, and the standard bar code with the highest correlation degree of the bar code to be detected is identified by using a cross correlation function, so that the absolute displacement is directly obtained.
The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.
Claims (6)
1. A method for encoding and identifying displacement using a resonance spectrum of a SNAP-structure microcavity, comprising the steps of:
s1, utilizing a displacement sensing system of a SNAP structure microcavity, axially moving the SNAP structure microcavity along the SNAP structure microcavity and keeping contact with a coupling waveguide to generate coupling, and recording resonance spectrums on nodes at different positions;
s2, taking the position of each resonant wavelength in the resonant spectrum as the central position of a black bar code, wherein the width of the black bar code corresponds to the transmittance of each resonant mode, so that the recorded resonant spectrum is converted into a standard bar code;
s3, inputting the obtained standard bar codes into a library to obtain standard bar code libraries of different coupling positions of the SNAP structure microcavity and the coupling waveguide;
s4, converting the resonance spectrum of the coupling position to be detected into a bar code to be detected according to the content of the step S2;
s5, encoding black bar codes of bar codes to be detected and bar codes in a standard bar code library into a plurality of 1S, encoding blank bar codes into a plurality of 0S, and enabling each bar code to form a signal matrix consisting of 0S and 1S;
s6, comparing the bar code to be detected with a signal matrix of a standard bar code in a standard bar code library, and searching out the maximum value in the cross correlation coefficient matrix, wherein the displacement represented by the standard bar code corresponding to the maximum value is the actual displacement of the bar code to be detected.
2. The method for coding and identifying displacement by using the resonance spectrum of SNAP-structure microcavity according to claim 1, wherein the specific content of step S6 is as follows:
and calculating the cross correlation coefficient of the signal matrix x (t) of the bar code to be detected and the signal matrix y (t) of each standard bar code by using a cross correlation function method to form a cross correlation coefficient matrix.
3. The method for coding and identifying displacement by using the resonance spectrum of SNAP-structure microcavity according to claim 1, wherein the displacement range of the displacement node of the resonance spectrum of step S1 is 0-200 μm.
4. A method of encoding and identifying displacements using the resonance spectrum of SNAP-structured microcavities as set forth in claim 3, wherein the number of displacement nodes is 1200, forming 1200 standard barcodes.
5. A method of encoding and identifying displacement using the resonance spectrum of a SNAP-structure microcavity as recited in claim 1, wherein the displacement sensing system comprises a tunable laser, a coupling waveguide, a SNAP-structure microcavity, and a photodetector; the SNAP structure microcavity is contacted with the coupling waveguide to be coupled, the generated optical signals are output from the output end of the coupling waveguide, the resonance spectrum is obtained by detection of a photoelectric detector, the position of each resonance wavelength in the resonance spectrum is used as the center position of a black bar code, the width of the black bar code corresponds to the transmittance of each resonance mode, and the black bar code is converted into a standard bar code or a bar code to be detected.
6. A method of encoding and identifying displacements using the resonance spectrum of SNAP-structure microcavities as set forth in claim 2, wherein the cross-correlation function expression is:
wherein T is the sample observation time, tau is the time shift, x (T) is the matrix signal of the bar code to be detected, and y (T) is the matrix signal of the standard bar code.
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| CN108844468A (en) * | 2018-06-01 | 2018-11-20 | 广东工业大学 | A kind of displacement sensing method based on the multistage axial mode Combined Calculation of Echo Wall microcavity |
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| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
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| WO2007033069A2 (en) * | 2005-09-13 | 2007-03-22 | Davidson Instruments Inc. | Tracking algorithm for linear array signal processor for fabry-perot cross-correlation pattern and method of using same |
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| CN108844468A (en) * | 2018-06-01 | 2018-11-20 | 广东工业大学 | A kind of displacement sensing method based on the multistage axial mode Combined Calculation of Echo Wall microcavity |
| CN108871200A (en) * | 2018-06-01 | 2018-11-23 | 广东工业大学 | A kind of probe-type micro-displacement sensing system based on nano surface axial direction photon structure Echo Wall microcavity |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
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| Jie Liao等.Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements.《light: science & applications》.2021,第10卷(第32期),第1-11页. * |
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