Acoustic signal detection system based on echo wall mode microcavity acoustic sensor

Abstract

The invention provides an acoustic signal detection system based on an echo wall mode microcavity acoustic sensor. The acoustic signal detection system can be applied to the technical field of acoustic signal sensing and detection. The acoustic signal detection system comprises an echo wall mode microcavity acoustic sensor used for performing amplitude and phase modulation on predetermined polarization modulation light to obtain output light under the condition that an external acoustic signal acts on the echo wall mode microcavity acoustic sensor and the predetermined polarization modulation light passes through the echo wall mode microcavity acoustic sensor; the detection unit is used for performing coherent processing on the output light based on the predetermined reference light to obtain two paths of target signals, and the two paths of target signals are related to the target transmission amount and the target phase amount; the processor is used for analyzing the two paths of target signals to obtain target transmission quantity and target phase quantity; and according to the target transmission amount, the target phase amount and a plurality of first target formulas, an external sound signal is obtained, and the plurality of first target formulas represent the incidence relation between the target transmission amount and the external signal and the incidence relation between the target phase amount and the external signal.

Description

Technical Field

[0001] The present disclosure relates to the field of acoustic signal sensing and detection technology, and more specifically, to an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor. Background Art

[0002] Whispering gallery mode microcavity acoustic sensors have attracted extensive attention due to their advantages such as high sensitivity, wide response range, fast response and easy integration. The sensing mechanism of whispering gallery mode microcavity acoustic sensors can be divided into acousto-optic dispersion response and acousto-optic dissipation response.

[0003] When an external acoustic signal acts on a whispering gallery mode microcavity acoustic sensor, both an acousto-optic dispersion response and an acousto-optic dissipation response often occur simultaneously. Related technologies typically assume that only the acousto-optic dispersion response or the acousto-optic dissipation response occurs. After detecting the light output from the whispering gallery mode microcavity acoustic sensor, the detection signal is applied to a calculation formula corresponding to this assumption to obtain the external acoustic signal. This results in a certain error between the obtained external acoustic signal and the actual external acoustic signal, affecting detection accuracy. Summary of the Invention

[0004] In view of this, the present disclosure provides an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor.

[0005] The present disclosure provides an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor, comprising: a whispering gallery mode microcavity acoustic sensor, configured to, when an external acoustic signal acts on the whispering gallery mode microcavity acoustic sensor and predetermined polarization modulated light passes through the whispering gallery mode microcavity acoustic sensor, perform amplitude and phase modulation on the predetermined polarization modulated light to obtain output light; a detection unit, configured to perform coherent processing on the output light based on predetermined reference light to obtain two target signals, wherein the two target signals are correlated with a target transmission amount and a target phase amount, wherein the target transmission amount represents an amplitude difference between the output light and input light, and the target phase amount represents a phase difference between the output light and input light, wherein the input light is pointer light before modulation of the predetermined polarization modulated light; and a processor, configured to analyze the two target signals to obtain the target transmission amount and the target phase amount; and obtain the external acoustic signal based on the target transmission amount, the target phase amount, and a plurality of first target formulas, wherein the plurality of first target formulas represent the correlation between the target transmission amount and the target phase amount and the external signal, respectively.

[0006] According to an embodiment of the present disclosure, the detection unit includes: a coherent detector for respectively detecting the real information and the imaginary information of the signal light after the predetermined reference light and the output light are coherent, and outputting a first signal light corresponding to the real information and a second signal light corresponding to the imaginary information; a first signal collector for collecting the first signal light to obtain a first target signal; and collecting the second signal light to obtain a second target signal, wherein the two target signals include a first target signal and a second target signal.

[0007] According to an embodiment of the present disclosure, the detection unit includes: a first beam splitter, used to split the output light to obtain a first split beam and a second split beam; a beam combiner, used to combine the first split beam and the predetermined reference light and interfere with each other to obtain an interference signal light; a second signal collector, used to collect the second split beam to obtain a third target signal; and collect the interference signal light to obtain a fourth target signal, wherein the two target signals include the third target signal and the fourth target signal.

[0008] According to an embodiment of the present disclosure, the processor is further used to determine a second target formula characterizing the correlation between the output light and the input light based on mode coupling theory; and to determine the multiple first target formulas based on the coefficients in the second target formula.

[0009] According to an embodiment of the present disclosure, the second target formula is as follows:

[0010] ;

[0011] in, , is the resonant frequency, is the initial resonant frequency of the whispering gallery mode microcavity in the above whispering gallery mode microcavity acoustic sensor, is the change in the resonant frequency of the whispering gallery mode microcavity caused by the external acoustic signal, , is the above-mentioned external sound signal, is the first coefficient;

[0012] , is the external coupling loss, is the initial external coupling loss of the whispering gallery mode microcavity, is the change in external coupling loss of the whispering gallery mode microcavity caused by the external acoustic signal, , is the second coefficient;

[0013] is the light field of the above output light, is the light field of the above input light, is the imaginary unit, is the frequency of the pointer light, is the intrinsic loss of the above-mentioned whispering gallery mode microcavity.

[0014] According to an embodiment of the present disclosure, a first target formula representing the correlation between the target transmission amount and the external signal is as follows:

[0015] ;

[0016] in, is the target transmission mentioned above;

[0017] The first target formula representing the correlation between the target phase quantity and the external signal is as follows:

[0018] ;

[0019] in, is the target phase quantity mentioned above.

[0020] According to an embodiment of the present disclosure, the first target signal satisfies the following formula:

[0021] ;

[0022] in, is the first target signal, is the amplitude of the above input light, is the amplitude of the predetermined reference light, is the target transmission, is the target phase quantity mentioned above;

[0023] The above second target signal conforms to the following formula:

[0024] ;

[0025] in, is the second target signal mentioned above.

[0026] According to an embodiment of the present disclosure, the third target signal satisfies the following formula:

[0027] ;

[0028] in, is the third target signal, is the intensity of the second split beam, is the target transmission mentioned above;

[0029] The fourth target signal mentioned above meets the following formula:

[0030] ;

[0031] in, is the fourth target signal, is the target phase quantity mentioned above.

[0032] According to an embodiment of the present disclosure, the acoustic signal detection system further includes: a first light source for outputting the pointer light; and a first polarization controller for performing polarization modulation on the pointer light to obtain the predetermined polarization modulated light.

[0033] According to an embodiment of the present disclosure, the above-mentioned acoustic signal detection system also includes: a second light source for outputting the above-mentioned pointer light; a second polarization controller for performing polarization modulation on the above-mentioned pointer light to obtain an initial predetermined polarization modulated light; and a second beam splitter for splitting the above-mentioned initial predetermined polarization modulated light to obtain the above-mentioned predetermined polarization modulated light and the above-mentioned predetermined reference light.

[0034] According to an embodiment of the present disclosure, by utilizing a whispering gallery mode microcavity acoustic sensor, when an external acoustic signal acts on the whispering gallery mode microcavity acoustic sensor and predetermined polarization modulated light passes through the whispering gallery mode microcavity acoustic sensor, amplitude and phase modulation is performed on the predetermined polarization modulated light to obtain output light, and a detection unit is utilized to perform coherent processing on the output light based on predetermined reference light to obtain two target signals, the two target signals being related to target transmission and target phase, the target transmission characterizing the amplitude difference between the output light and the input light, the target phase characterizing the phase difference between the output light and the input light, the input light being the pointer light before modulating the predetermined polarization modulated light, the two target signals being analyzed by a processor to obtain target transmission and target phase, thereby realizing detection of target transmission and target phase related to both acousto-optic dispersion response and acousto-optic dissipation response. Subsequently, the external sound signal can be obtained based on the target transmission amount and target phase amount related to both the acousto-optic dispersion response and the acousto-optic dissipation response, as well as multiple first target formulas, so that a more accurate external sound signal can be obtained when the external sound signal acts on the whispering gallery mode microcavity acoustic sensor and both the acousto-optic dispersion response and the acousto-optic dissipation response occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings.

[0036] Figure 1 A structural schematic diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to an embodiment of the present disclosure is shown.

[0037] Figure 2A schematic structural diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to another embodiment of the present disclosure is shown.

[0038] Figure 3 A structural schematic diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0040] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0041] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0042] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0043] In the embodiments of this disclosure, the collection, updating, analysis, processing, use, transmission, provision, disclosure, and storage of all data involved (including, but not limited to, user personal information) comply with relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures have been taken to prevent unauthorized access to user personal information and maintain the security of user personal information and network security.

[0044] In the embodiments of the present disclosure, the user's authorization or consent is obtained before obtaining or collecting the user's personal information.

[0045] When an external acoustic signal causes the whispering gallery mode microcavity in a whispering gallery mode microcavity acoustic sensor to undergo photoelastic effects and acoustic strain, an acousto-optic dispersion response occurs, manifesting as a mode shift of the whispering gallery mode. When an external acoustic signal acts on a coupling device, causing a change in the coupling between the coupling device and the whispering gallery mode microcavity, an acousto-optic dissipation response occurs, manifesting as a mode broadening of the whispering gallery mode.

[0046] When an external acoustic signal acts on a whispering gallery mode microcavity acoustic sensor, both the acousto-optic dispersion response and the acousto-optic dissipation response often occur simultaneously. However, related technologies typically assume that only the acousto-optic dispersion response or the acousto-optic dissipation response occurs. This introduces certain computational errors into the corresponding calculation formulas, affecting the actual calculated external acoustic signal. This can cause a certain discrepancy between the calculated external acoustic signal and the actual external acoustic signal, impacting detection accuracy.

[0047] Therefore, after detecting the light output by the whispering gallery mode microcavity acoustic sensor, it is necessary to explore the proportion of the two acoustic and optical response mechanisms in the detection signal, so as to achieve more accurate high-sensitivity acoustic signal detection and obtain more accurate external acoustic signals.

[0048] In view of this, an embodiment of the present disclosure provides an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor, which can be applied in the field of acoustic signal sensing and detection technology.

[0049] Figure 1 A structural schematic diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to an embodiment of the present disclosure is shown.

[0050] like Figure 1 As shown, the acoustic signal detection system 100 based on the whispering gallery mode microcavity acoustic sensor includes a whispering gallery mode microcavity acoustic sensor 101 , a detection unit 102 and a processor 103 .

[0051] The whispering gallery mode microcavity acoustic sensor 101 can be used to perform amplitude-phase modulation on predetermined polarization modulated light to obtain output light when an external acoustic signal acts on the whispering gallery mode microcavity acoustic sensor 101 and predetermined polarization modulated light passes through the whispering gallery mode microcavity acoustic sensor 101.

[0052] According to an embodiment of the present disclosure, a whispering gallery mode microcavity acoustic sensing platform may be first constructed, and then the whispering gallery mode microcavity acoustic sensing platform may be used as the whispering gallery mode microcavity acoustic sensor 101 .

[0053] According to an embodiment of the present disclosure, the external acoustic signal When the light acts on the whispering gallery mode microcavity acoustic sensor 101 , the whispering gallery mode microcavity in the whispering gallery mode microcavity acoustic sensor 101 generates an acousto-optic dispersion response and an acousto-optic dissipation response.

[0054] According to an embodiment of the present disclosure, the acousto-optic dispersion response may cause the initial resonant frequency of the whispering gallery mode microcavity in the whispering gallery mode microcavity acoustic sensor 101 to shift, and therefore, the shifted resonant frequency may be used to represent the acousto-optic dispersion response. It can be expressed as .in, is the initial resonant frequency of the whispering gallery mode microcavity in the whispering gallery mode microcavity acoustic sensor 101 . External sound signal The change in the resonant frequency of the whispering gallery mode microcavity caused by , is the first coefficient. From this we can know the resonant frequency With external sound signal Related.

[0055] According to the embodiments of the present disclosure, the acousto-optic dissipation response causes a change in the coupling between the coupling device and the whispering gallery mode microcavity in the whispering gallery mode microcavity acoustic sensor 101, causing a change in the initial external coupling loss of the whispering gallery mode microcavity. Therefore, the changed external coupling loss can be used to represent the acousto-optic dissipation response. Can be expressed .in, is the initial external coupling loss of the whispering gallery mode microcavity, is the change in external coupling loss of the whispering gallery mode microcavity caused by the external acoustic signal, , is the second coefficient. From this we can know that the external coupling loss With external sound signal Related.

[0056] According to an embodiment of the present disclosure, the first coefficient is obtained by calibrating the acoustic signal detection system 100 based on the whispering gallery mode microcavity acoustic sensor. and the second coefficient .

[0057] The detection unit 102 can be configured to coherently process the output light based on a predetermined reference light to obtain two target signals. These two target signals are related to a target transmission and a target phase. The target transmission represents the amplitude difference between the output light and the input light, while the target phase represents the phase difference between the output light and the input light. The input light is the pointer light before being modulated with a predetermined polarization modulated light. The target transmission reflects the transmission characteristics of the whispering gallery mode microcavity. The target phase reflects the phase characteristics of the whispering gallery mode microcavity.

[0058] According to an embodiment of the present disclosure, the pointer light may be a single-frequency pointer light output by a single-frequency light source.

[0059] According to an embodiment of the present disclosure, the pointer light may be a single-frequency laser emitted by a laser.

[0060] According to the embodiments of the present disclosure, the predetermined reference light can be selected according to actual conditions and is not limited here. For example, the predetermined reference light can be a local oscillator light. The predetermined reference light can also be a portion of the output light.

[0061] According to an embodiment of the present disclosure, when the predetermined reference light is local oscillator light, the frequency of the local oscillator light is equal to the frequency of the single-frequency pointer light.

[0062] The processor 103 can be configured to analyze the two target signals to obtain a target transmission and a target phase. The external acoustic signal is then obtained based on the target transmission, target phase, and a plurality of first target formulas. The plurality of first target formulas represent the correlation between the target transmission and target phase, respectively, and the external signal.

[0063] According to an embodiment of the present disclosure, the target transmission amount and the target phase amount are both related to the resonant frequency and external coupling loss The target transmission and target phase are related to the acousto-optic dispersion response and the acousto-optic dissipation response. The resonant frequency can be calculated by the target transmission, target phase and multiple first target formulas. and external coupling loss . And because of the resonant frequency and external coupling loss Both with external sound signals Related, according to the resonant frequency or external coupling loss , which can solve the external sound signal .

[0064] According to an embodiment of the present disclosure, by utilizing a whispering gallery mode microcavity acoustic sensor, when an external acoustic signal acts on the whispering gallery mode microcavity acoustic sensor and predetermined polarization modulated light passes through the whispering gallery mode microcavity acoustic sensor, amplitude and phase modulation is performed on the predetermined polarization modulated light to obtain output light, and a detection unit is utilized to perform coherent processing on the output light based on predetermined reference light to obtain two target signals, the two target signals being related to target transmission and target phase, the target transmission characterizing the amplitude difference between the output light and the input light, the target phase characterizing the phase difference between the output light and the input light, the input light being the pointer light before modulating the predetermined polarization modulated light, the two target signals being analyzed by a processor to obtain target transmission and target phase, thereby realizing detection of target transmission and target phase related to both acousto-optic dispersion response and acousto-optic dissipation response. Subsequently, the external sound signal can be obtained based on the target transmission amount and target phase amount related to both the acousto-optic dispersion response and the acousto-optic dissipation response, as well as multiple first target formulas, so that a more accurate external sound signal can be obtained when the external sound signal acts on the whispering gallery mode microcavity acoustic sensor and both the acousto-optic dispersion response and the acousto-optic dissipation response occur.

[0065] The processor 103 is further configured to determine a second target formula that characterizes the correlation between the output light and the input light based on the mode coupling theory, and to determine a plurality of first target formulas based on coefficients in the second target formula.

[0066] According to an embodiment of the present disclosure, the second target formula is shown in the following formula (1).

[0067] (1);

[0068] in, is the light field of the output light, is the light field of the input light, is the imaginary unit, is the frequency of the pointer light, is the intrinsic loss of the whispering gallery mode microcavity. is the coefficient in the second objective formula.

[0069] For example, the square value of the modulus of the coefficient in the second target formula can be calculated to obtain the target transmission amount .

[0070] For example, a first target formula characterizing the correlation between the target transmission amount and the external signal is shown in the following formula (2).

[0071] (2);

[0072] in, is the target transmission.

[0073] For example, the target phase quantity can be obtained by calculating the argument of the coefficient in the second target formula: .

[0074] For example, the first target formula that characterizes the correlation between the target phase quantity and the external signal is shown in the following formula (3).

[0075] (3);

[0076] in, is the target phase quantity. is the inverse tangent function.

[0077] According to an embodiment of the present disclosure, the acoustic signal detection system 100 based on the whispering gallery mode microcavity acoustic sensor may be an interferometric detection system or a coherent detection system.

[0078] Figure 2 A structural schematic diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to another embodiment of the present disclosure is shown. Figure 2 The acoustic signal detection system based on the whispering gallery mode microcavity acoustic sensor is a coherent detection system.

[0079] like Figure 2 As shown, the acoustic signal detection system 200 based on the whispering gallery mode microcavity acoustic sensor includes a whispering gallery mode microcavity acoustic sensor 201 , a detection unit 202 , a processor 203 , a first light source 204 and a first polarization controller 205 .

[0080] Figure 2 The whispering gallery mode microcavity acoustic sensor 201 and the processor 203 are respectively connected to Figure 1 The whispering gallery mode microcavity acoustic sensor 101 and the processor 103 have similar structures and functions, and for the sake of simplicity, they are not described here in detail.

[0081] Figure 2 The detection unit 202 in the embodiment can realize Figure 1 In the case of the function of the detection unit 102, the detection unit 202 also includes a coherent detector 2021 and a first signal collector 2022.

[0082] The first light source 204 can be used to output pointer light. For example, the first light source 204 can be a single-frequency light source, and the pointer light output by the first light source 204 can be single-frequency pointer light. The single-frequency pointer light can be a single-frequency laser. The first light source 204 can be a laser capable of emitting single-frequency laser light.

[0083] The first polarization controller 205 can be used to perform polarization modulation on the pointer light to obtain predetermined polarization modulated light.

[0084] According to an embodiment of the present disclosure, the first polarization controller 205 is used to polarize-modulate the pointer light to generate predetermined polarization-modulated light. This polarization-modulated light can excite a predetermined mode among multiple modes of the whispering gallery mode microcavity, where the predetermined mode is the optimal mode. This predetermined mode can be used as the sensing mode of the whispering gallery mode microcavity.

[0085] The coherent detector 2021 can be used to detect the real part information and the imaginary part information of the signal light after the predetermined reference light and the output light are coherent, and output a first signal light corresponding to the real part information and a second signal light corresponding to the imaginary part information.

[0086] The first signal collector 2022 can be used to collect the first signal light to obtain a first target signal, and collect the second signal light to obtain a second target signal. The two target signals include the first target signal and the second target signal.

[0087] According to an embodiment of the present disclosure, the first target signal satisfies the following formula (4).

[0088] (4);

[0089] in, is the first target signal, is the amplitude of the input light, is the amplitude of the predetermined reference light.

[0090] According to an embodiment of the present disclosure, the second target signal complies with the following formula (5).

[0091] (5);

[0092] in, is the second target signal.

[0093] According to the embodiment of the present disclosure, due to and It is known that after obtaining the first target signal and the second target signal Afterwards, 、 、 and Substituting into formula (4) and formula (5) we can solve and .

[0094] Figure 3 A structural schematic diagram of an acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor according to another embodiment of the present disclosure is shown. Figure 3The acoustic signal detection system based on the whispering gallery mode microcavity acoustic sensor is an interferometric detection system.

[0095] like Figure 3 As shown, the acoustic signal detection system 300 based on the whispering gallery mode microcavity acoustic sensor includes a whispering gallery mode microcavity acoustic sensor 301 , a detection unit 302 , a processor 303 , a second light source 304 , a second polarization controller 305 and a second beam splitter 306 .

[0096] Figure 3 The whispering gallery mode microcavity acoustic sensor 301 and the processor 303 are respectively connected to Figure 1 The whispering gallery mode microcavity acoustic sensor 101 and the processor 103 have similar structures and functions, and for the sake of simplicity, they are not described here in detail.

[0097] Figure 3 The detection unit 302 in the Figure 1 In the case of the function of the detection unit 102, the detection unit 302 also includes a first beam splitter 3021, a second signal collector 3022 and a combiner 3023.

[0098] The first beam splitter 3021 can be used to split the output light to obtain a first split beam and a second split beam. The beam combiner 3023 can be used to combine the first split beam and a predetermined reference light and then interfere with each other to obtain interference signal light.

[0099] The second signal collector 3022 can be used to collect the second split beam to obtain a third target signal and collect the interference signal light to obtain a fourth target signal. The two target signals include the third target signal and the fourth target signal.

[0100] The second light source 304 can be used to output pointer light. For example, the second light source 304 can be a single-frequency light source, and the pointer light output by the second light source 304 can be single-frequency pointer light. The single-frequency pointer light can be a single-frequency laser. The second light source 304 can be a laser capable of emitting single-frequency laser light.

[0101] The second polarization controller 305 can be used to perform polarization modulation on the pointer light to obtain an initial predetermined polarization modulated light. The second beam splitter 306 can be used to split the initial predetermined polarization modulated light to obtain a predetermined polarization modulated light and a predetermined reference light.

[0102] For example, the first beam splitter 3021 may be a 1:1 beam splitter that splits the output light into two identical beams. The second beam splitter 306 may be a 1:2 beam splitter. The predetermined polarization modulated light is 2 / 3 times the initial predetermined polarization modulated light, and the predetermined reference light is 1 / 3 times the initial predetermined polarization modulated light.

[0103] According to an embodiment of the present disclosure, the first beam splitter 3021 is a 1:1 beam splitter, and the second beam splitter 306 can be a 1:2 beam splitter to ensure that the equivalent light intensity of the first split beam light output by the first beam splitter 3021 is equal to the equivalent light intensity of the predetermined reference light output by the second beam splitter 306.

[0104] According to an embodiment of the present disclosure, the second polarization controller 305 performs polarization modulation on the pointer light to obtain an initial predetermined polarization modulated light. The second beam splitter 306 then splits the initial predetermined polarization modulated light to obtain a predetermined polarization modulated light. This allows the predetermined polarization modulated light to excite a predetermined mode among the multiple modes of the whispering gallery mode microcavity, where the predetermined mode is the optimal mode. The predetermined mode can be used as the sensing mode of the whispering gallery mode microcavity.

[0105] According to an embodiment of the present disclosure, the whispering gallery mode microcavity acoustic sensor 301, the first beam splitter 3021, the beam combiner 3023, and the second beam splitter 306 constitute an improved Mach-Zehnder interferometer, which can realize the functions of the Mach-Zehnder interferometer. The whispering gallery mode microcavity is located in the signal arm of the improved Mach-Zehnder interferometer.

[0106] According to an embodiment of the present disclosure, the third target signal satisfies the following formula (6).

[0107] (6);

[0108] in, is the third target signal, is the intensity of the second split beam.

[0109] According to an embodiment of the present disclosure, the fourth target signal satisfies the following formula (7).

[0110] (7);

[0111] in, is the fourth target signal.

[0112] According to the embodiment of the present disclosure, due to It is known that when the third target signal is obtained and the fourth target signal Afterwards, 、 and Substituting into formula (6) and formula (7) we can solve and .

[0113] According to the embodiment of the present disclosure, since the formulas (2) and (3) and is a known quantity, and when solving and After that, you can 、 、 and Substitute into formula (2) and formula (3), and solve the equations to obtain and The size of. , is a known quantity, and we get After the size of The size of. , is a known quantity, and we get After the size of The size of the acousto-optic dispersion response and the acousto-optic dissipation response are detected simultaneously. and , can get the external sound signal more accurately size.

[0114] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, even if such combinations or combinations are not explicitly described in this disclosure. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0115] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. An acoustic signal detection system based on a whispering gallery mode microcavity acoustic sensor, comprising: A whispering gallery mode microcavity acoustic sensor, configured to, when an external acoustic signal acts on the whispering gallery mode microcavity acoustic sensor and predetermined polarization modulated light passes through the whispering gallery mode microcavity acoustic sensor, perform amplitude and phase modulation on the predetermined polarization modulated light to obtain output light; a detection unit, configured to perform coherent processing on the output light based on a predetermined reference light to obtain two target signals, wherein the two target signals are related to a target transmission amount and a target phase amount, wherein the target transmission amount represents an amplitude difference between the output light and the input light, and the target phase amount represents a phase difference between the output light and the input light, wherein the input light is the pointer light before being modulated by the predetermined polarization modulated light; The processor is configured to analyze the two target signals to obtain the target transmission and the target phase; and obtain the external acoustic signal based on the target transmission, the target phase, and a plurality of first target formulas, wherein the plurality of first target formulas represent the correlation between the target transmission and the target phase, respectively, and the external signal.

2. The acoustic signal detection system according to claim 1, wherein: The detection unit comprises: a coherent detector, configured to respectively detect the real part information and the imaginary part information of the signal light after the predetermined reference light and the output light are coherent, and output a first signal light corresponding to the real part information and a second signal light corresponding to the imaginary part information; The first signal collector is used to collect the first signal light to obtain a first target signal; and collect the second signal light to obtain a second target signal, wherein the two target signals include the first target signal and the second target signal.

3. The acoustic signal detection system according to claim 1, wherein: The detection unit comprises: a first beam splitter, configured to split the output light to obtain a first split light beam and a second split light beam; a beam combiner, configured to combine the first split beam and the predetermined reference light and then perform interference on them to obtain interference signal light; The second signal collector is used to collect the second split beam to obtain a third target signal; and collect the interference signal light to obtain a fourth target signal, wherein the two target signals include the third target signal and the fourth target signal.

4. The acoustic signal detection system according to claim 1, wherein: The processor is further configured to determine, based on mode coupling theory, a second target formula characterizing a correlation relationship between the output light and the input light; The plurality of first target formulas are determined according to the coefficients in the second target formula.

5. The acoustic signal detection system according to claim 4, wherein: The second objective formula is as follows: ； in, , is the resonant frequency, is the initial resonant frequency of the whispering gallery mode microcavity in the whispering gallery mode microcavity acoustic sensor, is the change in the resonant frequency of the whispering gallery mode microcavity caused by the external acoustic signal, , is the external acoustic signal, is the first coefficient; , is the external coupling loss, is the initial external coupling loss of the whispering gallery mode microcavity, is the change in external coupling loss of the whispering gallery mode microcavity caused by the external acoustic signal, , is the second coefficient; is the light field of the output light, is the light field of the input light, is the imaginary unit, is the frequency of the pointer light, is the intrinsic loss of the whispering gallery mode microcavity.

6. The acoustic signal detection system according to claim 5, wherein: The first target formula representing the correlation between the target transmission amount and the external signal is as follows: ； in, is the target transmission amount; The first target formula representing the correlation relationship between the target phase quantity and the external signal is as follows: ； in, is the target phase quantity.

7. The acoustic signal detection system according to claim 2, wherein: The first target signal conforms to the following formula: ； in, is the first target signal, is the amplitude of the input light, is the amplitude of the predetermined reference light, is the target transmission, is the target phase quantity; The second target signal conforms to the following formula: ； in, is the second target signal.

8. The acoustic signal detection system according to claim 3, wherein: The third target signal conforms to the following formula: ； in, is the third target signal, is the intensity of the second split beam, is the target transmission amount; The fourth target signal conforms to the following formula: ； in, is the fourth target signal, is the target phase quantity.

9. The acoustic signal detection system according to claim 2, wherein: The acoustic signal detection system also includes: a first light source, configured to output the pointer light; The first polarization controller is used to perform polarization modulation on the pointer light to obtain the predetermined polarization modulated light.

10. The acoustic signal detection system according to claim 3, wherein: The acoustic signal detection system also includes: a second light source, configured to output the pointer light; a second polarization controller, configured to perform polarization modulation on the pointer light to obtain an initially predetermined polarization modulated light; The second beam splitter is used to split the initial predetermined polarization modulated light to obtain the predetermined polarization modulated light and the predetermined reference light.

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