A data processing method and device for an optical fiber interferometer

Abstract

The present invention provides a data processing method for an optical fiber interferometer, comprising: acquiring voltage phase sensitivity data and phase calibration signal data of a piezoelectric transducer element, processing the phase calibration signal data to generate input voltage amplitude data, performing external modulation processing on the input voltage amplitude data to generate modulated voltage amplitude data, performing demodulation processing on the modulated voltage amplitude data to generate output voltage amplitude data, processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data, and performing normalization processing on the system gain data according to the output voltage amplitude data to generate absolute value data of phase amplitude, so as to complete the data processing of the optical fiber interferometer. Through the data processing method for an optical fiber interferometer disclosed by the present invention, calibration of the phase amplitude of the optical fiber interferometer can be realized, and the measurement accuracy of the phase amplitude data of the optical fiber interferometer can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensing, and particularly to a data processing method and device for an optical fiber interferometer. Background Art

[0002] Optical fiber interferometers have important applications in the fields of national defense technology, aerospace, public safety, etc. due to their advantages such as high sensitivity, large dynamic range, long transmission distance, electromagnetic interference resistance, and harsh environment resistance. Among them, the optical fiber interferometer based on a 3×3 coupler has gradually become a research and application hotspot in the past decade for optical fiber interferometers due to its advantages such as passive demodulation, large dynamic range, simple structure, and controllable cost. Especially with the continuous improvement of the manufacturing process and performance of the 3×3 coupler. However, in the actual measurement process of the existing optical fiber interferometer based on a 3×3 coupler, due to factors such as laser power fluctuation, optical path transmission insertion loss fluctuation, and demodulation algorithm gain, the output voltage amplitude data is only proportional to the phase amplitude data, and the proportional coefficient has a large uncertainty, making it impossible to calibrate the phase amplitude data, resulting in a large measurement error and being not conducive to wide use and promotion. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a data processing device for an optical fiber interferometer, which can calibrate the phase amplitude of the optical fiber interferometer and improve the measurement accuracy of the phase amplitude data of the optical fiber interferometer.

[0004] To achieve the above object and other related objects, the present invention provides a data processing method for an optical fiber interferometer, including the steps of:

[0005] Obtaining the voltage-phase sensitivity data and phase calibration signal data of a piezoelectric transducer;

[0006] Processing the phase calibration signal data according to the voltage-phase sensitivity data to generate input voltage amplitude data;

[0007] Modulating and processing the input voltage amplitude data according to the voltage-phase sensitivity data to generate modulated voltage amplitude data;

[0008] Demodulating and processing the modulated voltage amplitude data to generate output voltage amplitude data;

[0009] Processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data; and

[0010] Normalizing the system gain data according to the output voltage amplitude data to generate the absolute value data of the phase amplitude, so as to complete the data processing of the optical fiber interferometer.

[0011] In an embodiment of the present invention, the step of obtaining the voltage phase sensitivity data of the piezoelectric transducer element includes:

[0012] Attempt the initial voltage amplitude data of the piezoelectric transducer element and generate a corresponding phase signal;

[0013] Perform a Bessel function ratio process on the phase signal to generate phase amplitude data; and

[0014] Perform a calculation process on the phase amplitude data and the initial voltage amplitude data to generate the voltage phase sensitivity data of the piezoelectric transducer element.

[0015] The present invention also provides a data processing device for an optical fiber interferometer, including:

[0016] An external modulation component for obtaining the voltage phase sensitivity data and phase calibration signal data of the piezoelectric transducer element, processing the phase calibration signal data according to the voltage phase sensitivity data to obtain input voltage amplitude data, and then performing an external modulation process on the input voltage amplitude data according to the voltage phase sensitivity data to generate modulated voltage amplitude data;

[0017] An optical fiber interferometer disposed on one side of the external modulation component, the optical fiber interferometer for receiving the phase calibration signal data and obtaining the modulated voltage amplitude data; and

[0018] A processor disposed on one side of the optical fiber interferometer for demodulating the modulated voltage amplitude data to generate output voltage amplitude data, processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data, and then normalizing the system gain data according to the output voltage amplitude data to generate the absolute value data of the phase amplitude to complete the data processing of the optical fiber interferometer.

[0019] In an embodiment of the present invention, the external modulation component includes:

[0020] A signal generator disposed on one side of the optical fiber interferometer, the signal generator for generating a modulation signal; and

[0021] A piezoelectric transducer element disposed on one side of the signal generator for cooperatively performing an external modulation process on the input voltage amplitude data with the signal generator.

[0022] In an embodiment of the present invention, the optical fiber interferometer includes:

[0023] A laser disposed on one side of the external modulation component, the laser for emitting an optical signal;

[0024] An optical fiber circulator is provided on one side of the laser;

[0025] A 3×3 coupler is provided on one side of the laser. The 3×3 coupler is used for optical power distribution and converting the sensed external environment change into an optical interference signal;

[0026] A plurality of Faraday mirrors are provided on one side of the 3×3 coupler. The Faraday mirrors are used for reflecting the optical signal emitted by the 3×3 coupler back into the 3×3 coupler and eliminating possible polarization fading; and

[0027] A photodetector is provided between the laser and the 3×3 coupler and is used for converting the optical signal output by the 3×3 coupler into an analog voltage signal.

[0028] In an embodiment of the present invention, the device further includes:

[0029] An analog-to-digital converter is connected to the photodetector of the fiber optic interferometer on one side and to the processor on the other side, and is used for receiving the analog voltage signal output by the fiber optic interferometer and converting the analog voltage signal into a digital signal.

[0030] In an embodiment of the present invention, one side of the optical fiber circulator is connected to the output end of the laser, and the other side of the optical fiber circulator is connected to one side of the 3×3 coupler. The optical fiber circulator is used for inputting the optical signal emitted by the laser into the 3×3 coupler and receiving the optical signal output by the 3×3 coupler.

[0031] In an embodiment of the present invention, there are three photodetectors. One side of two of the photodetectors is respectively connected to the 3×3 coupler, and the other side is respectively connected to the analog-to-digital converter. One side of the other photodetector is connected to the optical fiber circulator, and the other side of the other photodetector is connected to the analog-to-digital converter.

[0032] In an embodiment of the present invention, the piezoelectric transducer element is provided at the middle position between the 3×3 coupler and the Faraday mirror, and the optical fiber is wound around the outer wall.

[0033] In an embodiment of the present invention, one side of the piezoelectric transducer element is connected to one side of the signal generator through a transmission cable.

[0034] As described above, the present invention provides a data processing method and device for a fiber optic interferometer, which can calibrate the phase amplitude of the fiber optic interferometer and improve the measurement accuracy of the phase amplitude data of the fiber optic interferometer. Description of the Drawings

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0036] Figure 1 It shows a schematic structural diagram of a data processing device of an optical fiber interferometer according to the present invention.

[0037] Figure 2 It shows a schematic flow diagram of a data processing method of an optical fiber interferometer according to the present invention.

[0038] Figure 3 Shown as Figure 2 A schematic flow diagram of step S10 in

[0039] Description of component numbers:

[0040] 110, external modulation component; 111, signal generator; 112, piezoelectric transducer element;

[0041] 120, optical fiber interferometer; 121, laser; 122, optical fiber circulator; 123, 3×3 coupler; 124, Faraday mirror; 125, photodetector;

[0042] 130, analog-to-digital converter; 140, processor. Specific embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] Please refer to Figure 1As shown in the figure, the present invention provides a data processing device for an optical fiber interferometer. The data processing device may include an external modulation component 110, an optical fiber interferometer 120, an analog-to-digital converter 130, and a processor 140. Among them, the external modulation component 110 may include a signal generator 111 and a piezoelectric transducer element 112, which are used to obtain the voltage phase sensitivity data and phase calibration signal data of the piezoelectric transducer element, and process the phase calibration signal data according to the voltage phase sensitivity data to obtain the input voltage amplitude data. Then, the input voltage amplitude data is externally modulated according to the voltage phase sensitivity data to generate the modulated voltage amplitude data. The signal generator 111 can be used to generate a modulation signal. The piezoelectric transducer element 112 can be disposed on one side of the signal generator 111 to cooperate with the signal generator 111 to perform external modulation processing on the input voltage amplitude data. One side of the piezoelectric transducer element 112 and one side of the signal generator 111 can be connected through a transmission cable to reduce signal attenuation. The piezoelectric transducer element 112 can be a PZT piezoelectric ceramic. The PZT piezoelectric ceramic has the inverse piezoelectric effect, that is, it can generate a micro-displacement corresponding to the voltage signal under the applied voltage signal, and has the characteristics of high nanoscale resolution and microsecond-level response speed, meeting the accuracy requirements for optical phase modulation. However, it is not limited to this. The piezoelectric transducer element 112 can also be other transducer elements such as an electro-optic modulator, as long as it can meet the requirement of externally modulating the interferometer signal. However, it is not limited to this. The interferometer signal can also be internally modulated by the light source. The internal modulation component may include the signal generator 111 and the laser 121 in the optical fiber interferometer 120. When the interferometer is internally modulated by the light source, the laser 121 can be connected to the signal generator 111 through a transmission cable.

[0045] Please refer to Figure 1As shown, in an embodiment of the present invention, the fiber optic interferometer 120 may be disposed on one side of the external modulation component 110. The fiber optic interferometer 120 can be used to receive phase calibration signal data and obtain modulation voltage amplitude data. The fiber optic interferometer 120 may include a laser 121, an optical fiber circulator 122, a 3×3 coupler 123, a Faraday mirror 124, and a photodetector 125. Among them, the fiber optic interferometer 120 may be a Mach-Zehnder interferometer or a Michelson interferometer. However, it is not limited thereto. The fiber optic interferometer 120 may also be other types of interferometers, as long as the fiber optic interferometer 120 is a two-beam interferometer. The laser 121 may be disposed on one side of the external modulation component 110 to emit an optical signal, and the laser 121 may also be other light sources that can emit light. The optical fiber circulator 122 may be disposed on one side of the laser 121. One side of the optical fiber circulator 122 is connected to the output end of the laser 121, and the other side of the optical fiber circulator 122 is connected to one side of the 3×3 coupler 123, so as to input the optical signal emitted by the laser 121 into the 3×3 coupler 123 and receive the optical signal output by the 3×3 coupler 123. The 3×3 coupler 123 may be disposed on one side of the laser 121 to perform optical power distribution and convert the sensed external environment change into an optical interference signal. The laser 121, the optical fiber circulator 122, and the 3×3 coupler 123 may be sequentially connected through a sensing optical fiber. However, it is not limited thereto. The laser 121, the optical fiber circulator 122, and the 3×3 coupler 123 may be sequentially connected through other connection media, as long as they can transmit optical signals. Multiple Faraday mirrors 124 may be provided, and the multiple Faraday mirrors 124 may be disposed on the same side of the 3×3 coupler 123. The 3×3 coupler 123 and the Faraday mirrors 124 may be connected through a sensing optical fiber to reflect the optical signal emitted by the 3×3 coupler 123 back into the 3×3 coupler 123 and eliminate possible polarization fading. For example, it can be described by taking two Faraday mirrors 124 as an example. The two Faraday mirrors 124 may be disposed on the same side of the 3×3 coupler 123 through a sensing optical fiber. A piezoelectric transducer 112 is also provided through a sensing optical fiber between one of the Faraday mirrors 124 close to the signal generator 111 and the middle position of the 3×3 coupler 123, so as to cooperate with the signal generator 111 to perform external modulation processing on the input voltage amplitude data. When the 3×3 coupler 123 splits the optical signal received from the optical fiber circulator 122 into two and outputs it to the two Faraday mirrors 124 disposed on the same side of the 3×3 coupler 123, the Faraday mirrors 124 reflect the optical signal back into the 3×3 coupler 123. The optical signal reflected back into the 3×3 coupler 123 will output three optical signals after being processed by the 3×3 coupler 123 and send them to the two photodetectors 125 closest to the 3×3 coupler 123 and the optical fiber circulator 122 respectively.

[0046] Please refer to Figure 1 As shown, in one embodiment of the present invention, three photodetectors 125 may be provided, and the three photodetectors 125 may all be disposed between the laser 121 and the 3×3 coupler 123, for converting the optical signal output by the 3×3 coupler 123 into an analog voltage signal. However, this is not limited thereto, and other numbers of photodetectors 125 may also be provided. For example, four photodetectors 125 may be provided, or five photodetectors 125 may be provided, or other numbers may be provided, as long as the optical signal output by the 3×3 coupler 123 can be converted into an analog voltage signal. Among them, when three photodetectors 125 are provided, one side of two of the photodetectors 125 may be respectively connected to the 3×3 coupler 123 through sensing optical fibers, for receiving the optical signal output by the 3×3 coupler 123 and converting it into an analog voltage signal. The other side of the two photodetectors 125 may be respectively connected to the analog-to-digital converter 130 through sensing optical fibers, for sending the analog voltage signal to the analog-to-digital converter 130. One side of the other photodetector 125 may be connected to the optical fiber circulator 122, for receiving the optical signal that enters the optical fiber circulator 122 after being reflected by the Faraday mirror 124 from the 3×3 coupler 123, and converting it into an analog voltage signal. The other side of the other photodetector 125 may be connected to the analog-to-digital converter 130 through a sensing optical fiber, for sending the analog voltage signal to the analog-to-digital converter 130.

[0047] Please refer to Figure 1 As shown, in one embodiment of the present invention, three analog-to-digital converters 130 may be provided. However, this is not limited thereto. Four analog-to-digital converters 130 may be provided, or five analog-to-digital converters 130 may be provided, or other numbers may be provided, as long as the number is the same as that of the photodetectors 125. One side of the analog-to-digital converter 130 may be connected to the photodetector 125 of the fiber interferometer 120, and the other side of the analog-to-digital converter 130 may be connected to the processor 140, for receiving the analog voltage signal output by the photodetector 125 and converting the analog voltage signal into a digital signal and inputting it into the processor 140 for demodulation processing. The processor 140 is disposed on one side of the fiber interferometer 120, and the input end of the processor 140 is connected to the output ends of a plurality of analog-to-digital converters 130, for demodulating the modulation voltage amplitude data, generating output voltage amplitude data, processing the input voltage amplitude data and the output voltage amplitude data, generating system gain data, and then normalizing the system gain data according to the output voltage amplitude data to generate the absolute value data of the phase amplitude, so as to complete the data processing of the fiber interferometer.

[0048] Please refer to Figure 2As shown, the present invention provides a data processing method for a fiber optic interferometer, which can be applied to a data processing device of a fiber optic interferometer. The data processing method of the fiber optic interferometer may include the following steps:

[0049] Step S10: Obtain the voltage phase sensitivity data and phase calibration signal data of the piezoelectric transducer element.

[0050] Step S20: Process the phase calibration signal data according to the voltage phase sensitivity data to generate input voltage amplitude data.

[0051] Step S30: Modulate the input voltage amplitude data according to the voltage phase sensitivity data to generate modulated voltage amplitude data.

[0052] Step S40: Demodulate the modulated voltage amplitude data to generate output voltage amplitude data.

[0053] Step S50: Process the input voltage amplitude data and the output voltage amplitude data to generate system gain data.

[0054] Step S60: Normalize the system gain data according to the output voltage amplitude data to generate the absolute value data of the phase amplitude, so as to complete the data processing of the fiber optic interferometer.

[0055] In an embodiment of the present invention, when step S10 is executed, the voltage phase sensitivity data and the phase calibration signal data are obtained. Specifically, step S10 may include steps S11 to S13, which are introduced in detail as follows:

[0056] Step S11: Try the initial voltage amplitude data of the piezoelectric transducer element and generate a corresponding phase signal.

[0057] Step S12: Perform a Bessel function ratio process on the phase signal to generate phase amplitude data.

[0058] Step S13: Perform a calculation process on the phase amplitude data and the initial voltage amplitude data to generate voltage phase sensitivity data.

[0059] In an embodiment of the present invention, the voltage phase sensitivity data and the phase calibration signal data can be obtained through the external modulation component 110. However, this is not limited thereto, and the voltage phase sensitivity data and the phase calibration signal data can also be obtained through the internal modulation component. Among them, the external modulation component 110 can include a signal generator 111, and the signal generator 111 can be used to generate a modulation signal. Calculating and processing the phase amplitude data and the initial voltage amplitude data means performing a division operation on the phase amplitude data and the initial voltage amplitude data, so that the phase amplitude data is divided by the initial voltage amplitude data to obtain the quotient of the phase amplitude data and the initial voltage amplitude data, which is the voltage phase sensitivity data, in order to generate the voltage phase sensitivity data.

[0060] In an embodiment of the present invention, when step S20 is executed, that is, the phase calibration signal data is processed according to the voltage phase sensitivity data to generate the input voltage amplitude data. Specifically, according to the voltage phase sensitivity data, it is necessary to use the external modulation component 110 to generate the voltage amplitude of the phase calibration signal data, which is the input voltage amplitude data.

[0061] In an embodiment of the present invention, when step S30 is executed, that is, the input voltage amplitude data is externally modulated according to the voltage phase sensitivity data to generate modulated voltage amplitude data. Specifically, the external modulation component 110 for externally modulating the input voltage amplitude data may include a signal generator 111 and a piezoelectric transducer element 112. The piezoelectric transducer element 112 may be disposed on one side of the signal generator 111 to cooperate with the signal generator 111 to externally modulate the input voltage amplitude data. One side of the piezoelectric transducer element 112 and one side of the signal generator 111 may be connected by a transmission cable to reduce signal attenuation. The piezoelectric transducer element 112 may be a PZT piezoelectric ceramic, which has an inverse piezoelectric effect, that is, it can generate a micro displacement corresponding to the voltage signal under the application of a voltage signal, and has the characteristics of nanoscale high resolution and microsecond-level response speed, meeting the accuracy requirements for optical phase modulation. However, it is not limited thereto. The piezoelectric transducer element 112 may also be other transducer elements such as an electro-optic modulator, as long as it can satisfy the external modulation of the interferometer signal. However, it is not limited thereto. The interferometer signal may also be internally modulated by a light source. The internal modulation component may include a signal generator 111 and a laser 121 in the fiber optic interferometer 120. And when the light source of the interferometer is internally modulated, the laser 121 may be connected to the signal generator 111 by a transmission cable. Externally modulating the input voltage amplitude data according to the voltage phase sensitivity data is to perform a division operation on the input voltage amplitude data and the voltage phase sensitivity data to generate the quotient of the input voltage amplitude data and the voltage phase sensitivity data, which is the modulated voltage amplitude data. The modulated voltage amplitude data also needs to be obtained by using the fiber optic interferometer 120. Among them, the fiber optic interferometer 120 may be disposed on one side of the external modulation component 110. The fiber optic interferometer 120 can be used to receive the phase calibration signal data and obtain the modulated voltage amplitude data. The fiber optic interferometer 120 may include a laser 121, a fiber optic circulator 122, a 3×3 coupler 123, a Faraday mirror 124, and a photodetector 125. The laser 121 may be disposed on one side of the external modulation component 110 to emit an optical signal, and the laser 121 may also be other light sources that can emit light. The fiber optic circulator 122 may be disposed on one side of the laser 121. One side of the fiber optic circulator 122 is connected to the output end of the laser 121, and the other side of the fiber optic circulator 122 is connected to one side of the 3×3 coupler 123 to input the optical signal emitted by the laser 121 into the 3×3 coupler 123 and receive the optical signal output by the 3×3 coupler 123. The 3×3 coupler 123 may be disposed on one side of the laser 121 to perform optical power distribution and convert the sensed external environment change into an optical interference signal.The laser 121, the optical fiber circulator 122, and the 3×3 coupler 123 can be sequentially connected through the sensing optical fiber. However, this is not limited thereto. The laser 121, the optical fiber circulator 122, and the 3×3 coupler 123 can be sequentially connected through other connection media as long as they can transmit optical signals. Multiple Faraday mirrors 124 can be provided, and the multiple Faraday mirrors 124 can be provided on the same side of the 3×3 coupler 123. The 3×3 coupler 123 and the Faraday mirrors 124 can be connected through the sensing optical fiber to reflect the optical signal emitted by the 3×3 coupler 123 back into the 3×3 coupler 123 and eliminate possible polarization fading. For example, it can be described by taking two Faraday mirrors 124 as an example. The two Faraday mirrors 124 can be provided on the same side of the 3×3 coupler 123 through the sensing optical fiber. A piezoelectric transducer 112 is also provided through the sensing optical fiber between one of the Faraday mirrors 124 close to the signal generator 111 and the middle position of the 3×3 coupler 123 to cooperate with the signal generator 111 to perform external modulation processing on the input voltage amplitude data. Three photodetectors 125 can be provided, and the three photodetectors 125 can all be provided between the laser 121 and the 3×3 coupler 123 to convert the optical signal output by the 3×3 coupler 123 into an analog voltage signal. One side of two of the photodetectors 125 can be respectively connected to the 3×3 coupler 123 through the sensing optical fiber to receive the optical signal output by the 3×3 coupler 123 and convert it into an analog voltage signal. The other side of two of the photodetectors 125 can be respectively connected to the analog-to-digital converter 130 through the sensing optical fiber to send the analog voltage signal to the analog-to-digital converter 130. One side of the other photodetector 125 can be connected to the optical fiber circulator 122 to receive the optical signal that enters the optical fiber circulator 122 after being reflected by the Faraday mirror 124 from the 3×3 coupler 123 and convert it into an analog voltage signal. The other side of the other photodetector 125 can be connected to the analog-to-digital converter 130 through the sensing optical fiber to send the analog voltage signal to the analog-to-digital converter 130.

[0062] In an embodiment of the present invention, when step S40 is executed, that is, demodulation processing is performed on the modulation voltage amplitude data to generate output voltage amplitude data. Specifically, the modulation voltage amplitude data can be input into the processor 140 for demodulation processing. The processor 140 can be provided on one side of the fiber optic interferometer 120, and the input end of the processor 140 is connected to the output ends of multiple analog-to-digital converters 130 to perform demodulation processing on the modulation voltage amplitude data and generate output voltage amplitude data.

[0063] In an embodiment of the present invention, when step S50 is executed, that is, the input voltage amplitude data and the output voltage amplitude data are processed to generate system gain data. Specifically, processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data means using the processor 140 to perform a division operation on the output voltage amplitude data and the input voltage amplitude data to obtain the quotient of the output voltage amplitude data and the input voltage amplitude data, which is the system gain data.

[0064] In an embodiment of the present invention, when step S60 is executed, that is, the system gain data is normalized according to the output voltage amplitude data to generate the absolute value data of the phase amplitude, so as to complete the data processing of the fiber optic interferometer. Specifically, normalizing the system gain data according to the output voltage amplitude data means dividing the output voltage amplitude data by the system gain data to obtain the absolute value data of the phase amplitude and complete the data processing of the fiber optic interferometer.

[0065] In summary, through a data processing method and device for a fiber optic interferometer provided by the present invention, by obtaining voltage phase sensitivity data and phase calibration signal data, and processing the phase calibration signal data according to the voltage phase sensitivity data to obtain input voltage amplitude data, then performing an external modulation process on the input voltage amplitude data according to the voltage phase sensitivity data to generate modulated voltage amplitude data, and then using the processor to demodulate the modulated voltage amplitude data to obtain output voltage amplitude data, and finally processing the input voltage amplitude data and the output voltage amplitude data to obtain system gain data, and normalizing the output voltage amplitude data and the system gain data to obtain the absolute value data of the phase amplitude, so as to complete the data processing of the fiber optic interferometer, it is possible to calibrate the phase amplitude of the fiber optic interferometer and improve the measurement accuracy of the phase amplitude data of the fiber optic interferometer.

[0066] In the description of this specification, the descriptions referring to terms such as "this embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0067] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A data processing method for an optical fiber interferometer, characterized in that The processing method includes the steps of: obtaining voltage phase sensitivity data and phase calibration signal data of a piezoelectric transducer element; processing the phase calibration signal data according to the voltage phase sensitivity data to generate input voltage amplitude data; performing modulation processing on the input voltage amplitude data according to the voltage phase sensitivity data to generate modulated voltage amplitude data; performing demodulation processing on the modulated voltage amplitude data to generate output voltage amplitude data; processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data; and performing normalization processing on the system gain data according to the output voltage amplitude data to generate absolute value data of phase amplitude, so as to complete the data processing of the fiber optic interferometer.

2. The data processing method of the fiber optic interferometer according to claim 1, wherein The step of obtaining the voltage phase sensitivity data of the piezoelectric transducer element includes: attempting initial voltage amplitude data of the piezoelectric transducer element and generating a corresponding phase signal; performing Bessel function ratio processing on the phase signal to generate phase amplitude data; and performing calculation processing on the phase amplitude data and the initial voltage amplitude data to generate the voltage phase sensitivity data of the piezoelectric transducer element.

3. A data processing device for an optical fiber interferometer, characterized in that, The device includes: an external modulation component for obtaining voltage phase sensitivity data and phase calibration signal data of a piezoelectric transducer element, processing the phase calibration signal data according to the voltage phase sensitivity data to obtain input voltage amplitude data, and then performing external modulation processing on the input voltage amplitude data according to the voltage phase sensitivity data to generate modulated voltage amplitude data; a fiber optic interferometer disposed on one side of the external modulation component, the fiber optic interferometer being configured to receive the phase calibration signal data and obtain the modulated voltage amplitude data; and a processor disposed on one side of the fiber optic interferometer for performing demodulation processing on the modulated voltage amplitude data to generate output voltage amplitude data, processing the input voltage amplitude data and the output voltage amplitude data to generate system gain data, and then performing normalization processing on the system gain data according to the output voltage amplitude data to generate absolute value data of phase amplitude, so as to complete the data processing of the fiber optic interferometer.

4. The data processing device of the fiber optic interferometer according to claim 3, characterized in that The external modulation component includes: a signal generator disposed on one side of the fiber optic interferometer, the signal generator being configured to generate a modulation signal; and a piezoelectric transducer element disposed on one side of the signal generator for cooperating with the signal generator to perform external modulation processing on the input voltage amplitude data.

5. The data processing device of the fiber optic interferometer according to claim 3, characterized in that The fiber optic interferometer includes: a laser disposed on one side of the external modulation component, the laser being configured to emit an optical signal; an optical fiber circulator disposed on one side of the laser; a 3×3 coupler disposed on one side of the laser, the 3×3 coupler being configured to perform optical power distribution and convert the sensed external environment change into an optical interference signal; a plurality of Faraday mirrors disposed on one side of the 3×3 coupler, the Faraday mirrors being configured to reflect the optical signal emitted from the 3×3 coupler back into the 3×3 coupler and eliminate possible polarization fading; and A photodetector is disposed in the middle of the laser and the 3×3 coupler, and is used to convert the optical signal output by the 3×3 coupler into an analog voltage signal.

6. The data processing device of the fiber optic interferometer according to claim 3, characterized in that, The device further includes: An analog-to-digital converter, one side of which is connected to the photodetector of the fiber optic interferometer, and the other side of the analog-to-digital converter is connected to the processor, for receiving the analog voltage signal output by the fiber optic interferometer and converting the analog voltage signal into a digital signal.

7. The data processing device of the fiber optic interferometer according to claim 5, characterized in that, One side of the fiber optic circulator is connected to the output end of the laser, and the other side of the fiber optic circulator is connected to one side of the 3×3 coupler. The fiber optic circulator is used to input the optical signal emitted by the laser into the 3×3 coupler and receive the optical signal output by the 3×3 coupler.

8. The data processing device of the fiber optic interferometer according to claim 5, characterized in that There are three photodetectors. One side of two of the photodetectors is respectively connected to the 3×3 coupler, and the other side is respectively connected to the analog-to-digital converter. One side of the other photodetector is connected to the fiber optic circulator, and the other side of the other photodetector is connected to the analog-to-digital converter.

9. The data processing device of the fiber optic interferometer according to claim 4, characterized in that, The piezoelectric transducer element is disposed at the middle position between the 3×3 coupler and the Faraday mirror, and the optical fiber is wound around the outer wall.

10. The data processing device of the fiber optic interferometer according to claim 4, characterized in that, One side of the piezoelectric transducer element is connected to one side of the signal generator through a transmission cable.

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