CN114279606A - Distributed sensing system of diaphragm type pressure sensor and distributed multiplexing method thereof - Google Patents
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Abstract
The invention discloses a distributed sensing system of a diaphragm type pressure sensor and a distributed multiplexing method thereof, belonging to the technical field of optical fiber multiplexing, wherein the system comprises: narrow linewidth laser, the acoustic optical modulator, the isolator, erbium-doped fiber amplifier, the circulator, single mode sensing optical fiber, a plurality of sound pressure diaphragm sensors, photoelectric detector, data acquisition card, host computer and signal generator, wherein, narrow linewidth laser, the acoustic optical modulator, isolator and erbium-doped fiber amplifier connect gradually, erbium-doped fiber amplifier is connected to the first port of circulator, single mode sensing optical fiber is connected to the second port, photoelectric detector is connected to the third port, single mode sensing optical fiber laminating is installed on a plurality of sound pressure diaphragm sensors, photoelectric detector connects data acquisition card, data acquisition card connects the host computer, signal generator's output port connection acoustic optical modulator. The system realizes time division multiplexing through the sensing optical fiber, realizes multi-point measurement by utilizing a plurality of sound pressure diaphragm sensors, and reduces the complexity of a demodulation system.
Description
Technical Field
The invention relates to the technical field of optical fiber multiplexing, in particular to a distributed sensing system of a diaphragm type pressure sensor and a distributed multiplexing method thereof.
Background
As the human cognition on optics is continuously deepened, the optical fiber sensing technology is rapidly developed, including temperature, vibration, pressure, strain and the like. The optical fiber sensing technology utilizes optical fibers as sensing units, has the advantages of high transmission speed, large transmission capacity, electromagnetic interference resistance, low cost and the like, and is widely applied to a plurality of fields of perimeter security, pipeline leakage monitoring, building health monitoring and the like in recent years.
The current point type sensor is difficult to realize and measures the sensing signal of multiple points simultaneously, and the prior art often needs one set of demodulation system of each sensor collocation, and the system complexity is high, the wasting of resources. The principle of distributed optical fiber sensing is that when the external temperature and pressure are changed while waiting for measurement and the optical fiber is stressed to generate strain, the refractive index of the optical fiber is changed, so that the optical characteristics of the light transmitted in the optical fiber are changed (such as the intensity, wavelength, frequency, phase, polarization state and the like of the light). The variable to be measured can be measured by detecting and analyzing the relationship between the change of the optical characteristic of the output light and the corresponding variable to be measured.
The multiplexing technology in the optical fiber sensing system mainly includes Wavelength Division Multiplexing (WDM), Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and the like. The principle of the frequency division multiplexing technology is that the frequencies of modulation signals are loaded in a differentiated mode, the modulation frequencies of all the interferometers are different, then output signals with different modulation frequencies are transmitted to a photoelectric detector through sensing optical fibers, and finally the signals modulated by the frequencies are demodulated, so that information is obtained. But frequency division multiplexing is limited by optical power and the bandwidth of the bandpass filter. The principle of the wavelength division multiplexing technology is that optical signals with different wavelengths are mixed and transmitted through a sensing optical fiber, then the optical signals are divided into multiple optical signals with single wavelength by the wavelength division multiplexer and output to each path of interferometer, output signals of each path of interferometer are combined and then transmitted to a photoelectric detector through a single optical fiber, and finally the photoelectric detector with different wavelengths detects and outputs the multiple signals. The wavelength division multiplexing technology uses more optical devices and has higher performance requirements on the devices, and due to the nonlinear effect of the optical fiber, the problems of channel spacing, center frequency and the like need to be considered in practical application. Compared with frequency division multiplexing and wavelength division multiplexing technologies, the time division multiplexing technology reduces the number of light sources, transmission optical fibers and detectors in the system, improves the utilization rate and the multiplexing efficiency of devices, and has the advantages of simple structure, low cost and the like. However, the time division multiplexing technique is limited by factors such as optical power, signal sampling rate, and system crosstalk.
The development direction of the fiber sensing technology is approaching to multiple uses more and more, that is, a fiber sensor can be used for measuring changes of a plurality of physical quantities at the same time, and the existing MEMS sensor can simultaneously measure temperature, pressure or other two physical parameters, so that the micro-optical technology combining fiber sensing and other micro-technologies is also a direction for future development. Therefore, a sensing system capable of simultaneously detecting a plurality of point conditions and having a low system complexity is needed, and the technical problem that the devices required for simultaneously demodulating sensor arrays such as the conventional acoustic pressure membrane sensor are complex is solved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present invention is to propose a distributed sensing system of a diaphragm pressure sensor.
Another object of the present invention is to provide a distributed multiplexing method of a distributed sensing system of a diaphragm type pressure sensor, which can realize accurate measurement of a plurality of points while reducing the complexity of a demodulation apparatus.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a distributed sensing system of a diaphragm pressure sensor, including: the device comprises a narrow-linewidth laser, an acousto-optic modulator, an isolator, an erbium-doped fiber amplifier, a circulator, a single-mode sensing fiber, a plurality of sound pressure diaphragm sensors, a photoelectric detector, a data acquisition card, an upper computer and a signal generator, wherein the narrow-linewidth laser is connected with the acousto-optic modulator, and the isolator is connected with the acousto-optic modulator; the optical fiber amplifier is characterized in that the erbium-doped optical fiber amplifier is connected with the isolator, a first port of the circulator is connected with the erbium-doped optical fiber amplifier, a second port of the circulator is connected with the single-mode sensing optical fiber, a third port of the circulator is connected with the photoelectric detector, the single-mode sensing optical fiber is attached to the plurality of sound pressure diaphragm sensors, the photoelectric detector is connected with the data acquisition card, the data acquisition card is connected with the upper computer, and an output port of the signal generator is connected with the acousto-optic modulator.
The distributed sensing system of the diaphragm type pressure sensor of the embodiment of the invention utilizes the optical fiber as a medium for information transmission, the single-mode sensing optical fiber is attached and installed on the plurality of sound pressure diaphragm sensors, the sound pressure diaphragm sensors are utilized to sense the external pressure change, the plurality of sound pressure diaphragm sensors are subjected to the pressure change so as to lead the optical fiber at the position to generate strain, the refractive index of the optical fiber is changed, the optical characteristic of the transmitted light in the single-mode sensing optical fiber is changed, namely, the returned back scattering light carries the information of the external pressure change and is transmitted back through one sensing optical fiber, the information change collected by the plurality of sound pressure diaphragm sensors can be obtained through a set of demodulation device, the sensing distance can be calculated according to the time of the reflected light reaching the demodulation device, and the information collected by the specific position sensor can be obtained, the time division multiplexing of the optical fiber is realized; because a plurality of sound pressure diaphragm sensors are distributed, multipoint accurate measurement can be realized; in addition, only one set of demodulation equipment is needed, the system structure is simple, and resources are saved.
In addition, the distributed sensing system of the diaphragm type pressure sensor according to the above embodiment of the present invention may further have the following additional technical features:
further, in one embodiment of the present invention, the narrow linewidth laser is used to emit continuous light having a wavelength of 1550 nm.
Further, in an embodiment of the present invention, the acousto-optic modulator is configured to modulate the continuous light into pulsed light by using the pulse signal emitted by the signal generator.
Further, in an embodiment of the present invention, the acoustic pressure diaphragm sensors are arranged on the single-mode sensing optical fiber according to a preset requirement.
Further, in one embodiment of the present invention, the plurality of acoustic pressure diaphragm sensors are configured to acquire a plurality of pressure variation information and couple the plurality of pressure variation information to the single mode sensing fiber.
Further, in an embodiment of the present invention, the single-mode sensing fiber is configured to generate backward rayleigh scattered light carrying sound pressure variation information, and transmit the backward rayleigh scattered light carrying sound pressure variation information to the photodetector through the third port of the circulator.
Further, in one embodiment of the present invention, the photodetector is configured to receive the backward rayleigh scattered light carrying sound pressure variation information and convert it into an electrical signal.
Further, in an embodiment of the present invention, the data acquisition card is configured to acquire an electrical signal and perform analog-to-digital conversion on the electrical signal to obtain a digital signal.
Further, in an embodiment of the present invention, the upper computer is configured to demodulate the digital signal to obtain phase information, and obtain pressure change information through the phase information.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a distributed multiplexing method for a distributed sensing system of a diaphragm pressure sensor, including the following steps: step S1, using the narrow linewidth laser to emit continuous light with the wavelength of 1550nm to the acousto-optic modulator; step S2, the signal generator is used for emitting pulse signals to drive the acousto-optic modulator so as to modulate the continuous light into pulse light; step S3, amplifying the pulsed light by the erbium-doped fiber amplifier, and making the amplified pulsed light enter the single-mode sensing fiber through the first port and the second port of the circulator; step S4, when the external pressure changes, the sound pressure diaphragm sensors acquire a plurality of pieces of pressure change information, and couple the pressure change information to the single-mode sensing optical fiber, so that the backward Rayleigh scattering light generated in the single-mode sensing optical fiber carries the sound pressure change information; step S5, transmitting the backward rayleigh scattered light carrying sound pressure change information to the photodetector through the second port and the third port of the circulator, and converting it into an electrical signal; step S6, collecting the electric signals by using the data acquisition card, and performing analog-to-digital conversion to obtain digital signals; and step S7, demodulating the digital signal by using the upper computer to obtain phase information, and obtaining the pressure change information through the phase information.
The distributed multiplexing method of the distributed sensing system of the diaphragm type pressure sensor of the embodiment of the invention utilizes the optical fiber as a medium for information transmission, the single-mode sensing optical fiber is attached and installed on the plurality of sound pressure diaphragm sensors, the sound pressure diaphragm sensors are utilized to sense the external pressure change, the plurality of sound pressure diaphragm sensors are subjected to the pressure change so as to lead the optical fiber at the position to generate strain, thus leading the refractive index of the optical fiber to change, leading the optical characteristic of the transmitted light in the single-mode sensing optical fiber to change, namely the returned back scattering light carries the information of the external pressure change and is transmitted back through one sensing optical fiber, the information change collected by the plurality of sound pressure diaphragm sensors can be obtained through a set of demodulation device, the sensing distance can be calculated according to the time of the reflected light reaching the demodulation device, and the information collected by the specific position sensor can be obtained, the time division multiplexing of the optical fiber is realized; because a plurality of sound pressure diaphragm sensors are distributed, multipoint accurate measurement can be realized; in addition, only one set of demodulation equipment is needed, the system structure is simple, and resources are saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a distributed sensing system of a diaphragm pressure sensor in accordance with one embodiment of the present invention;
fig. 2 is a schematic diagram of a specific connection between a single-mode sensing optical fiber and an acoustic pressure diaphragm sensor according to an embodiment of the present invention.
Description of reference numerals:
100-a distributed sensing system of a diaphragm type pressure sensor, 1-a narrow linewidth laser, 2-an acoustic optical modulator, 3-an isolator, 4-an erbium-doped optical fiber amplifier, 5-a circulator, 6-a single-mode sensing optical fiber, 7-a plurality of sound pressure diaphragm sensors, 8-a photoelectric detector, 9-a data acquisition card, 10-an upper computer and 11-a signal generator.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A distributed sensing system of a diaphragm type pressure sensor and a distributed multiplexing method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings, and first, a distributed sensing system of a diaphragm type pressure sensor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a distributed sensing system of a diaphragm pressure sensor according to an embodiment of the present invention.
As shown in fig. 1, the distributed sensing system 100 of the diaphragm pressure sensor includes: the device comprises a narrow-line-width laser 1, an acoustic-optical modulator 2, an isolator 3, an erbium-doped fiber amplifier 4, a circulator 5, a single-mode sensing fiber 6, a plurality of sound pressure diaphragm sensors 7, a photoelectric detector 8, a data acquisition card 9, an upper computer 10 and a signal generator 11.
The narrow linewidth laser 1 is connected with the acousto-optic modulator 2, the isolator 3 is connected with the acousto-optic modulator, the erbium-doped optical fiber amplifier 4 is connected with the isolator 3, the first port of the circulator 5 is connected with the erbium-doped optical fiber amplifier 4, the second port is connected with the single-mode sensing optical fiber 6, the third port is connected with the photoelectric detector 8, the single-mode sensing optical fiber 6 is attached to and installed on the plurality of sound pressure diaphragm sensors 7, the photoelectric detector 8 is connected with the data acquisition card 9, the data acquisition card 9 is connected with the upper computer 10, and the output port of the signal generator 11 is connected with the acousto-optic modulator 2.
Further, in one embodiment of the present invention, a narrow linewidth laser is used to emit continuous light having a wavelength of 1550nm into the acousto-optic modulator 2.
Further, in one embodiment of the present invention, the acousto-optic modulator 2 is driven by a pulse signal emitted from the signal generator 11, modulates the continuous light emitted from the narrow-linewidth laser 1 into a pulse light, and stabilizes the optical power of the pulse light by the isolator 3.
Further, in an embodiment of the present invention, the erbium-doped fiber amplifier 4 amplifies optical power of the pulsed light, and the amplified pulsed light enters the single-mode sensing fiber 6 through the first port and the second port of the circulator 5.
Further, in an embodiment of the present invention, the plurality of sound pressure diaphragm sensors 7 are arranged on the single-mode sensing optical fiber 6 according to a preset requirement, and the single-mode sensing optical fiber 6 is attached to the plurality of sound pressure diaphragm sensors 7, wherein the plurality of sound pressure diaphragm sensors 7 sense information about external pressure changes and couple the information about the pressure changes to the single-mode sensing optical fiber 6, and backward rayleigh scattered light generated by the single-mode sensing optical fiber 6 is carried and transmitted back to implement time division multiplexing of the optical fiber. The external pressure can change the optical characteristics of the transmission light in the sensing optical fiber, so that backward Rayleigh scattering light carrying external sound pressure change information is obtained.
It should be noted that, as shown in fig. 2, the plurality of diaphragm sound pressure sensors 7-1, 7-2, 7-3 … … 7-N are sound pressure diaphragm sensors with high sensitivity, and are arranged in an optimal distribution according to a preset requirement; the single-mode sensing optical fiber 6 is attached and arranged on the multiple sound pressure diaphragm sensors 7-1, 7-2 and 7-3 … … 7-N which are arranged at last; the sound pressure diaphragm sensors 7-1, 7-2, and 7-3 … … 7-N are used to collect external pressure changes, and at this time, the sound pressure diaphragm sensors 7-1, 7-2, and 7-3 … … 7-N receive pressure changes to generate strain in the optical fiber at the position, which causes the refractive index of the optical fiber to change, so that the phase of the transmitted backward rayleigh scattered light changes, that is, the sound pressure diaphragm sensor 7 couples external pressure information into the single-mode sensing optical fiber 6, and the backward rayleigh scattered light is transmitted to the circulator 5 through the single-mode sensing optical fiber 6.
Further, in an embodiment of the present invention, the backward rayleigh scattered light carrying the external sound pressure change information generated by the single-mode sensing fiber 6 passes through the photodetector 8 and then converts the optical signal into an electrical signal.
Further, in an embodiment of the present invention, the data acquisition card 9 acquires the electrical signal converted by the photodetector 8, performs high-precision analog-to-digital conversion, and then transmits the converted data signal to the upper computer 10.
Further, in an embodiment of the present invention, the upper computer 10 may calculate a sensing distance, that is, a specific position of the sensor, according to the time of arrival of the signal, and simultaneously receive the digital signal transmitted by the data acquisition card 9, demodulate the digital signal to obtain phase information, and obtain information of the external pressure change through the phase information.
Therefore, the working principle of the distributed sensing system of the diaphragm type pressure sensor provided by the embodiment of the invention is as follows: the method comprises the steps of utilizing a narrow-linewidth laser 1 to emit continuous light with the wavelength of 1550nm to an acousto-optic modulator 2, driving the acousto-optic modulator 2 by a pulse signal emitted by a signal generator 11, modulating the continuous light into pulse light, amplifying the pulse light through an erbium-doped optical fiber amplifier 4, transmitting the amplified pulse light to a single-mode sensing optical fiber 6 through a circulator 5, sensing the external pressure change condition through a sound pressure diaphragm sensor 7, coupling the pressure change condition into the single-mode sensing optical fiber 6, enabling backward Rayleigh scattering light generated in the single-mode sensing optical fiber 6 to carry sound pressure change information, transmitting the backward Rayleigh scattering light carrying the sound pressure change information to a photoelectric detector 8 through the circulator 5, converting the backward Rayleigh scattering light into an electric signal, collecting the electric signal through a data collecting card 9, performing analog-to-digital conversion, and then transmitting an upper computer 10 to perform subsequent phase demodulation and the like to obtain the external pressure change condition, meanwhile, the position of the single-mode sensing optical fiber 6 where any acoustic pressure film sensor 7 is located can be calculated according to the time for collecting the returned backward rayleigh scattered light.
In summary, according to the distributed sensing system of the diaphragm pressure sensor provided by the embodiment of the invention, the position of the sound pressure diaphragm sensor which is optimally arranged can be accurately detected only by one single-mode optical fiber, and the pressure change of the position can be known by demodulating the phase of the signal, so that accurate measurement of multiple points can be realized, the detection range is expanded and the sensitivity is ensured under the condition of ensuring the spatial resolution; meanwhile, due to the fact that time division multiplexing of the optical fibers is utilized, pressure signals collected by all the sound pressure diaphragm sensors are transmitted back to the same demodulation device to be demodulated, and complexity of the demodulation device is greatly reduced.
Next, a distributed multiplexing method of a distributed sensing system of a diaphragm type pressure sensor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The method specifically comprises the following steps:
in step S1, continuous light having a wavelength of 1550nm is emitted to the acousto-optic modulator using a narrow-linewidth laser.
In step S2, the acousto-optic modulator is driven by the signal generator to emit a pulse signal to modulate the continuous light into pulsed light.
In step S3, the pulsed light is amplified by the erbium-doped fiber amplifier, and the amplified pulsed light enters the single-mode sensing fiber through the first port and the second port of the circulator.
In step S4, when the external pressure changes, the plurality of acoustic pressure diaphragm sensors acquire a plurality of pressure change information and couple the plurality of pressure change information to the single-mode sensing fiber, so that the backward rayleigh scattered light generated in the single-mode sensing fiber carries the acoustic pressure change information.
In step S5, the backward rayleigh scattered light carrying the sound pressure change information is transmitted to the photodetector through the second port and the third port of the circulator, and is converted into an electrical signal.
In step S6, the data acquisition card is used to collect the electrical signals and perform analog-to-digital conversion to obtain digital signals.
In step S7, the digital signal is demodulated by the upper computer to obtain phase information, and pressure change information is obtained from the phase information.
It should be noted that the foregoing explanation of the embodiment of the distributed sensing system of the diaphragm pressure sensor also applies to the distributed multiplexing method of the distributed sensing system of the diaphragm pressure sensor of this embodiment, and details are not repeated here.
According to the distributed multiplexing method of the distributed sensing system of the diaphragm type pressure sensor, which is provided by the embodiment of the invention, the position of the sound pressure diaphragm sensor which is optimally distributed can be accurately detected only by one single-mode optical fiber, and the pressure change of the position can be known by demodulating the phase of a signal, so that the accurate measurement of a plurality of points can be realized, the detection range is expanded and the sensitivity is ensured under the condition of ensuring the spatial resolution; meanwhile, due to the fact that time division multiplexing of the optical fibers is utilized, pressure signals collected by all the sound pressure diaphragm sensors are transmitted back to the same demodulation device to be demodulated, and complexity of the demodulation device is greatly reduced.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A distributed sensing system for a diaphragm pressure sensor, comprising: narrow linewidth laser, acousto-optic modulator, isolator, erbium-doped optical fiber amplifier, circulator, single-mode sensing optical fiber, several sound pressure diaphragm sensors, photoelectric detector, data acquisition card, upper computer and signal generator,
narrow linewidth laser instrument connects acousto-optic modulator, the isolator is connected acousto-optic modulator, erbium-doped fiber amplifier connects the isolator, the first port of circulator is connected erbium-doped fiber amplifier, the second port is connected single mode sensing optical fiber, the third port is connected photoelectric detector, the laminating of single mode sensing optical fiber is installed on a plurality of acoustic pressure diaphragm sensors, photoelectric detector connects data acquisition card, data acquisition card connects the host computer, signal generator's output port is connected acousto-optic modulator.
2. The distributed sensing system of claim 1, wherein said narrow linewidth laser is configured to emit continuous light having a wavelength of 1550 nm.
3. The distributed sensing system of diaphragm pressure sensor according to claim 1, wherein said acousto-optic modulator is configured to modulate continuous light into pulsed light using the pulsed signal from said signal generator.
4. The distributed sensing system of claim 1, wherein the plurality of acoustic pressure diaphragm sensors are arranged on the single-mode sensing fiber according to a predetermined requirement.
5. The distributed sensing system of claim 4, wherein said plurality of acoustic pressure diaphragm sensors are configured to acquire a plurality of pressure change information and couple said plurality of pressure change information to said single mode sensing fiber.
6. The distributed sensing system of the diaphragm pressure sensor according to claim 1, wherein the single-mode sensing fiber is configured to generate backward rayleigh scattered light carrying sound pressure variation information, and transmit the backward rayleigh scattered light carrying sound pressure variation information to the photodetector through the third port of the circulator.
7. The distributed sensing system of the diaphragm pressure sensor according to claim 1, wherein the photodetector is configured to receive backward rayleigh scattered light carrying sound pressure variation information and convert the backward rayleigh scattered light into an electrical signal.
8. The distributed sensing system of claim 1, wherein the data acquisition card is configured to acquire an electrical signal and perform analog-to-digital conversion on the electrical signal to obtain a digital signal.
9. The distributed sensing system of the diaphragm pressure sensor according to claim 1, wherein the upper computer is configured to demodulate the digital signal to obtain phase information, and obtain pressure change information through the phase information.
10. A distributed multiplexing method of a distributed sensing system of a diaphragm pressure sensor, which is based on the distributed sensing system of the diaphragm pressure sensor of any one of claims 1 to 9, and comprises the following steps:
step S1, using the narrow linewidth laser to emit continuous light with the wavelength of 1550nm to the acousto-optic modulator;
step S2, the signal generator is used for emitting pulse signals to drive the acousto-optic modulator so as to modulate the continuous light into pulse light;
step S3, amplifying the pulsed light by the erbium-doped fiber amplifier, and making the amplified pulsed light enter the single-mode sensing fiber through the first port and the second port of the circulator;
step S4, when the external pressure changes, the sound pressure diaphragm sensors acquire a plurality of pieces of pressure change information, and couple the pressure change information to the single-mode sensing optical fiber, so that the backward Rayleigh scattering light generated in the single-mode sensing optical fiber carries the sound pressure change information;
step S5, transmitting the backward rayleigh scattered light carrying sound pressure change information to the photodetector through the second port and the third port of the circulator, and converting it into an electrical signal;
step S6, collecting the electric signals by using the data acquisition card, and performing analog-to-digital conversion to obtain digital signals;
and step S7, demodulating the digital signal by using the upper computer to obtain phase information, and obtaining the pressure change information through the phase information.
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| CN114545174A (en) * | 2022-04-28 | 2022-05-27 | 华北电力大学 | Partial discharge optical fiber distributed sensing system of transformer |
| CN115096427A (en) * | 2022-06-09 | 2022-09-23 | 电子科技大学 | Distributed optical fiber array sensing sound wave detection system and method |
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