CN115165141B - Optical sensing demodulation module, system and method - Google Patents
Optical sensing demodulation module, system and method Download PDFInfo
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- CN115165141B CN115165141B CN202210916911.3A CN202210916911A CN115165141B CN 115165141 B CN115165141 B CN 115165141B CN 202210916911 A CN202210916911 A CN 202210916911A CN 115165141 B CN115165141 B CN 115165141B
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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Abstract
本申请公开了一种光传感解调模块、系统及方法，其中，光传感解调模块包括发光器、第一环形器、光匹配器、第二环形器、光传感器、第一光电探测器、第二光电探测器及数据处理单元；其中，第一环形器与发光器连接；光匹配器与第一环形器连接；第二环形器与第一环形器连接；光传感器与第二环形器连接；第一光电探测器与光传感器连接；第二光电探测器与第二环形器连接；数据处理单元与第一光电探测器及第二光电探测器连接。本申请提升了解调精度，充分保证了对待测物理量的测量灵敏度。
The present application discloses a light sensing demodulation module, system and method, wherein the light sensing demodulation module comprises a light emitter, a first circulator, a light matcher, a second circulator, a light sensor, a first photodetector, a second photodetector and a data processing unit; wherein the first circulator is connected to the light emitter; the light matcher is connected to the first circulator; the second circulator is connected to the first circulator; the light sensor is connected to the second circulator; the first photodetector is connected to the light sensor; the second photodetector is connected to the second circulator; and the data processing unit is connected to the first photodetector and the second photodetector. The present application improves the demodulation accuracy and fully guarantees the measurement sensitivity of the physical quantity to be measured.
Description
Technical Field
The application relates to the technical field of optical sensing, in particular to an optical sensing demodulation module, an optical sensing demodulation system and an optical sensing demodulation method.
Background
The working principle of the fiber grating sensor is that a certain device is used for converting the change of the physical quantity to be measured into the change of the temperature or the strain acting on the fiber grating, so that the center wavelength of an optical signal in the reflection spectrum of the fiber grating sensor is caused to deviate, and the measurement result of the physical quantity to be measured is obtained based on the deviation condition of the center wavelength of the optical signal in the reflection spectrum of the fiber grating sensor.
In the prior art, a demodulation system is mainly used for demodulating the central wavelength deviation condition of an optical signal in the reflection spectrum of the fiber grating sensor, and common demodulation methods include a matched grating method, an unbalanced M-Z interference method, a wavelength scanning method, an edge filter linear demodulation method and the like. The matched grating method has the advantages of simple structure and low cost, and has been widely applied in the field of optical sensing. Specifically, the working principle of the matched grating method is as follows: the demodulation system applying the matched grating method comprises two fiber grating sensors with similar parameters, wherein one fiber grating sensor is a sensing fiber grating and is used for measuring the physical quantity to be measured; the other fiber grating sensor is a matched fiber grating and is used as a detector. When the sensing fiber bragg grating measures the physical quantity to be measured, the reflection spectrum of the sensing fiber bragg grating deviates within a certain range; however, the reflection spectrum of the matched fiber grating sensor is relatively fixed. At this time, when the optical signal reflected by the matched fiber bragg grating is input into the sensing fiber bragg grating, only the optical signal corresponding to the overlapping portion of the reflection spectrum of the matched fiber bragg grating and the reflection spectrum of the sensing fiber bragg grating is reflected by the sensing fiber bragg grating, and the center wavelength shift condition of the optical signal in the reflection spectrum of the fiber bragg grating sensor can be determined based on the light intensity value of the optical signal reflected by the sensing fiber bragg grating.
However, when the area of the overlapping portion of the reflection spectrum of the matched fiber grating and the reflection spectrum of the sensing fiber grating is smaller, the demodulation mode cannot accurately demodulate the central wavelength shift condition of the optical signal in the reflection spectrum of the fiber grating sensor, the demodulation sensitivity is low, and the measurement sensitivity of the physical quantity to be measured is reduced.
Disclosure of Invention
The application aims to provide a light sensing demodulation module, a light sensing demodulation system and a light sensing demodulation method, which improve demodulation sensitivity and fully ensure measurement sensitivity of a physical quantity to be measured.
Embodiments of the present application are implemented as follows:
In a first aspect, the application provides an optical sensing demodulation module, which comprises a light emitter, a first circulator, an optical matcher, a second circulator, an optical sensor, a first photoelectric detector, a second photoelectric detector and a data processing unit; wherein the first circulator is connected with the illuminator; the optical matcher is connected with the first circulator; the second circulator is connected with the first circulator; the optical sensor is connected with the second circulator; the first photoelectric detector is connected with the optical sensor; the second photoelectric detector is connected with the second circulator; the data processing unit is connected with the first photoelectric detector and the second photoelectric detector; the optical matcher is used for receiving a light source signal emitted by the light emitter through the first circulator and reflecting the first light signal taking the preset wavelength as the center wavelength into the light sensor through the first circulator and the second circulator; the optical sensor is used for reflecting a second optical signal to the second photoelectric detector through the second circulator and transmitting a third optical signal to the first photoelectric detector according to the measurement condition of the physical quantity to be measured; the second optical signal is an optical signal corresponding to the overlapping part of the reflection spectrum of the optical sensor and the reflection spectrum of the optical matcher; the third optical signal is an optical signal corresponding to a non-overlapping portion of the reflection spectrum of the optical sensor and the reflection spectrum of the optical matcher; the first photoelectric detector is used for converting the third optical signal into a first electric signal and transmitting the first electric signal into the data processing unit, and the second photoelectric detector is used for converting the second optical signal into a second electric signal and transmitting the second electric signal into the data processing unit; the data processing unit is used for obtaining a measurement result of the physical quantity to be measured according to the first electric signal and the second electric signal.
In one embodiment, the first circulator includes a first port, a second port, and a third port, the second port being connected to the first port and the third port, respectively; the second circulator comprises a fourth port, a fifth port and a sixth port, and the fifth port is respectively connected with the fourth port and the sixth port; the output end of the illuminator is connected with the first port; the input end of the optical matcher is connected with the second port; the third port is connected with the fourth port; the input end of the optical sensor is connected with the fifth port, and the output end of the optical sensor is connected with the input end of the first photoelectric detector; the output end of the first photoelectric detector is connected with the input end of the data processing unit; the input end of the second photoelectric detector is connected with the sixth port, and the output end of the second photoelectric detector is connected with the input end of the data processing unit.
In one embodiment, the data processing unit includes a differential amplifying device; the differential amplifying device is connected with the first photoelectric detector and the second photoelectric detector.
In an embodiment, the data processing unit further includes a filtering unit; the differential amplifying device is connected with the first photoelectric detector and the second photoelectric detector through the filtering unit.
In an embodiment, the optical sensor is a fiber bragg grating sensor, or a fabry perot filter, or a micro-ring filter; the optical matcher is a fiber grating sensor, a Fabry-Perot filter or a micro-ring filter.
In a second aspect, the present application provides an optical sensing demodulation system, including a plurality of optical sensing demodulation modules described above; wherein, a plurality of light sensing demodulation modules are connected in sequence; in the optical sensing demodulation system, the center wavelength of the optical signal reflected by the optical matcher of each optical sensing demodulation module is different; a plurality of light sensing demodulation modules in the light sensing demodulation system share one light emitter, and the light emitter is connected with a first port of a first circulator in a first light sensing demodulation module.
In an embodiment, the optical matcher in each optical sensing demodulation module is connected to the first port of the first circulator in the next optical sensing demodulation module.
In one embodiment, the optical sensing demodulation system further includes a calculation module; the computing module is respectively connected with the data processing unit in each optical sensing demodulation module.
In a third aspect, the present application provides a method for optical sensing demodulation, including:
After entering each optical sensing demodulation module, the light source signals emitted by the light emitter enter the optical matcher through the first circulator, the optical matcher reflects the first light signals taking the preset wavelength as the center wavelength into the optical sensor through the first circulator and the second circulator, and transmits the rest light source signals into the next optical sensing demodulation module;
after the first optical signal is received by the optical sensor, reflecting a second optical signal into a second photoelectric detector through a second circulator according to the measurement condition of the physical quantity to be measured, and transmitting a third optical signal into the first photoelectric detector; the second optical signal is an optical signal corresponding to the overlapping part of the reflection spectrum of the optical sensor and the reflection spectrum of the optical matcher; the third optical signal is an optical signal corresponding to a non-overlapping portion of the reflection spectrum of the optical sensor and the reflection spectrum of the optical matcher;
The first photoelectric detector converts the third optical signal into a first electric signal and sends the first electric signal to the data processing unit, and the second photoelectric detector converts the second optical signal into a second electric signal and sends the second electric signal to the data processing unit;
The data processing unit obtains a measurement result of the physical quantity to be measured based on the first electric signal and the second electric signal.
In an embodiment, the data processing unit obtains a measurement result of the physical quantity to be measured based on the first electrical signal and the second electrical signal, including:
The data processing unit performs differential amplification operation on the first electric signal and the second electric signal to obtain a third electric signal, and inputs the third electric signal into the calculation module;
The calculation module determines the center wavelength shift condition of the optical signal reflected by the optical sensor based on the third electric signal, and obtains a measurement result of the physical quantity to be measured according to the center wavelength shift condition of the reflected optical signal of the optical reflection spectrum of the optical sensor.
Compared with the prior art, the application has the beneficial effects that: the optical sensing demodulation module comprises a light emitter, a first circulator, an optical matcher, a second circulator, an optical sensor, a first photoelectric detector, a second photoelectric detector and a data processing unit. Wherein the first circulator is connected with the illuminator; the optical matcher is connected with the first circulator; the second circulator is connected with the first circulator; the optical sensor is connected with the second circulator; the first photoelectric detector is connected with the optical sensor; the second photoelectric detector is connected with the second circulator; the data processing unit is connected with the first photoelectric detector and the second photoelectric detector.
According to the application, the central wavelength deviation condition of the optical signal in the reflection spectrum of the fiber bragg grating sensor can be accurately demodulated by the optical sensing demodulation module based on the reflection light intensity value and the transmission light intensity value by collecting the light intensity value of the overlapping part of the reflection spectrum of the optical sensor and the reflection spectrum of the optical matcher (namely, collecting the reflection light intensity value of the optical sensor) and the light intensity value of the non-overlapping part of the reflection spectrum of the optical sensor (namely, collecting the transmission light intensity value of the optical sensor).
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical sensing demodulation module according to an embodiment of the application;
FIG. 2 is a schematic diagram of a reflection spectrum of a photosensor and a reflection spectrum of an optical matcher according to an embodiment of the present application;
FIG. 3 is a schematic diagram showing the intensity variation of an optical signal relative to the center wavelength variation in the optical reflection spectrum of an optical sensor according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an optical sensing demodulation system according to an embodiment of the present application;
Fig. 5 is a flow chart of a photo-sensing demodulation method according to an embodiment of the application.
Reference numerals:
10-an optical sensing demodulation module; 11-a light emitter; 12-a first circulator; 13-an optical matcher; 14-a second circulator; 15-a light sensor; 16-a first photodetector; 17-a second photodetector; 18-a data processing unit; 181-a filtering unit; 182-differential amplifying device; a 20-calculation module; 100-optical sensing demodulation system.
Detailed Description
The terms "first," "second," "third," and the like are used merely for distinguishing between descriptions and not for indicating a sequence number, nor are they to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "inner", "outer", "left", "right", "upper", "lower", etc., are based on directions or positional relationships shown in the drawings, or directions or positional relationships conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a photo-sensor demodulation module 10 according to an embodiment of the application. The optical sensing demodulation module 10 in the application can be used for measuring physical quantities to be measured such as pressure, temperature, acceleration, speed and the like. Specifically, as shown in fig. 1, the optical sensing demodulation module 10 in the present application includes a light emitter 11, a first circulator 12, an optical matcher 13, a second circulator 14, an optical sensor 15, a first photodetector 16, a second photodetector 17, and a data processing unit 18; wherein the first circulator 12 is connected to the light emitter 11; the optical matcher 13 is connected with the first circulator 12; the second circulator 14 is connected to the first circulator 12; the light sensor 15 is connected with the second circulator 14; the first photodetector 16 is connected with the light sensor 15; the second photodetector 17 is connected to the second circulator 14. Illustratively, the light emitter 11 may be an ASE laser source, or a SLED laser source; the optical sensor 15 may be a fiber bragg grating sensor, or a fabry perot filter, or a micro-ring filter; the optical matcher 13 may be a fiber grating sensor, or a fabry perot filter, or a micro-ring filter.
In one embodiment, a narrow-band laser light source matching the center wavelength of the optical signal in the reflection spectrum of the optical matcher 13 may be used instead of the light emitter 11 and the optical matcher 13.
In one embodiment, as shown in fig. 1, the first circulator 12 includes a first port a, a second port b and a third port c, and the second port b is connected to the first port a and the third port c, respectively; the second circulator 14 includes a fourth port d, a fifth port e and a sixth port f, and the fifth port e is connected to the fourth port d and the sixth port f, respectively; the output end of the light emitter 11 is connected with the first port a; the input end of the optical matcher 13 is connected with a second port b; the third port c is connected with the fourth port d; the input end of the optical sensor 15 is connected with the fifth port e, and the output end of the optical sensor 15 is connected with the input end of the first photoelectric detector 16; the output end of the first photoelectric detector 16 is connected with the input end of the data processing unit 18; an input end of the second photodetector 17 is connected to the sixth port f, and an output end of the second photodetector 17 is connected to an input end of the data processing unit 18.
In one embodiment, as shown in FIG. 1, the data processing unit 18 includes a differential amplifying device 182; the differential amplifier 182 is connected to the first photodetector 16 and the second photodetector 17. Specifically, the input terminal of the differential amplifying device 182 is connected to the output terminal of the first photodetector 16 and the output terminal of the second photodetector 17, respectively. In addition, as shown in fig. 1, the data processing unit 18 further includes a filtering unit 181, and an input end of the differential amplifying device 182 is connected to an output end of the first photodetector 16 and an output end of the second photodetector 17 through the filtering unit 181. As shown in fig. 1, the filter unit 181 includes a plurality of resistive elements as shown in fig. 1, so that the filter unit 181 may further include electrical elements such as a capacitor and an inductor; for convenience of description, electrical components such as capacitors and inductors are not illustrated in fig. 1.
In one embodiment, the differential amplifying device 182 of the present application may be replaced by two amplifying devices and a digital-to-analog conversion chip; wherein, at this time, the input end of one amplifying device is connected with the output end of the first photoelectric detector 16 through the filtering unit 181, and the input end of the other amplifying device is connected with the output end of the second photoelectric detector 17 through the filtering unit 181; the input ends of the digital-to-analog conversion chips are respectively connected with the output ends of the two amplifying devices.
In an operation process, when the physical quantity to be measured is measured, the light source signal emitted by the light emitter 11 enters the optical matcher 13 through the first port a and the second port b of the first circulator 12, the first optical signal with the preset wavelength as the center wavelength is reflected by the optical matcher 13 into the second circulator 14 through the second port b and the third port c of the first circulator 12, and is reflected into the optical sensor 15 through the fourth port d and the fifth port e of the second circulator 14. For example, when a light source signal having a wavelength range of λ 1 to λ n emitted from the light emitter 11 is input into the optical matcher 13 via the first circulator 12, the optical matcher 13 may reflect an optical signal having a center wavelength of λ 1 into the optical sensor 15 via the first circulator 12 and the second circulator 14.
After receiving the first optical signal, the optical sensor 15 reflects the second optical signal to the second photodetector 17 through the fifth port e and the sixth port f of the second circulator 14 according to the measurement condition of the physical quantity to be measured, and transmits the third optical signal to the first photodetector 16; the second optical signal is an optical signal corresponding to a portion of the optical sensor 15 where the reflection spectrum of the optical matcher 13 overlaps (as shown in fig. 2 a); the third optical signal is an optical signal corresponding to a portion where the reflection spectrum of the optical sensor 15 does not overlap with the reflection spectrum of the optical matcher 13 (as shown in fig. 2 b).
The first photodetector 16, after receiving the third optical signal, converts the third optical signal into a first electrical signal and sends the first electrical signal to the data processing unit 18; the second photodetector 17, upon receiving the second optical signal, converts the second optical signal into a second electrical signal and sends the second electrical signal to the data processing unit 18. The first electrical signal and the second electrical signal may be voltage signals or current signals, depending on the type of the photodetector. After the data module processing module receives the first electrical signal and the second electrical signal, the differential amplifying device 182 performs a difference operation on the first electrical signal and the second electrical signal, and then performs a fixed gain amplifying operation on the electrical signal subjected to the difference operation. At this time, the shift of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15 can be determined based on the third electric signal. Further, based on the shift of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15, a measurement result of the physical quantity to be measured can be obtained.
Therefore, in the application, the central wavelength deviation condition of the optical signal in the reflection spectrum of the fiber bragg grating sensor can be accurately demodulated by the optical sensing demodulation module based on the difference value of the reflection light intensity value and the transmission light intensity value through collecting the light intensity value of the overlapping part of the reflection spectrum of the optical sensor 15 and the reflection spectrum of the optical matcher 13 (namely, collecting the reflection light intensity value of the optical sensor 15) and the light intensity value of the non-overlapping part of the reflection spectrum of the optical sensor 15 (namely, collecting the transmission light intensity value of the optical sensor 15), so that the demodulation sensitivity is improved, and the measurement sensitivity of the physical quantity to be measured is fully ensured. Specifically, as shown in fig. 3, compared with the prior art, the demodulation sensitivity of the optical sensing demodulation module 10 in the present application is improved by about two times.
It should be noted that, in the above embodiment of the present application, the third electrical signal can only reflect the shift of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15, and the shift direction of the center wavelength cannot be reflected by the third electrical signal. In order to enable the third electrical signal to reflect the moving direction of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15, a wavelength offset may be preset for the optical matcher 13 (i.e., the reflection spectrum of the optical matcher 13 is offset to the left or right in fig. 2), so that the moving direction of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15 is judged by the increasing or decreasing condition of the third electrical signal. For example, when the physical quantity to be measured is temperature, the shift of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15 can only reflect the change of the current temperature, but it cannot be known whether the current temperature is specifically increased or decreased; however, if the moving direction of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15 is known, it is possible to determine whether the specific current temperature has increased or decreased based on the moving direction of the center wavelength. Therefore, by the measures, the measurement accuracy of the physical quantity to be measured can be improved.
Fig. 4 is a schematic structural diagram of an optical sensing demodulation system 100 according to an embodiment of the application. As shown in fig. 4, the optical sensing demodulation system 100 in the present application includes a plurality of optical sensing demodulation modules 10 as shown in fig. 1; the optical sensing demodulation modules 10 are sequentially connected, specifically, the optical matcher 13 in each optical sensing demodulation module 10 is connected with the first port a of the first circulator 12 in the next optical sensing demodulation module 10; meanwhile, as shown in fig. 4, in the present application, a plurality of optical sensing demodulation modules 10 in the optical sensing demodulation system 100 share one light emitter 11, and the light emitter 11 is connected to the first port a of the first circulator 12 in the first optical sensing demodulation module 10.
In order to enable the optical sensing demodulation system 100 to measure a plurality of physical quantities to be measured at the same time, in the present application, in the optical sensing demodulation system 100, center wavelengths of optical signals reflected by the optical matchers 13 of each optical sensing demodulation module 10 are different. For example, when the light emitter 11 emits the light source signal having the wavelength range of λ 1 to λ n, the optical matcher 13 in the first optical sensing demodulation module 10 may reflect only the light signal having the center wavelength of λ 1; the optical matcher 13 in the second optical sensing demodulation module 10 may reflect only the optical signal having the center wavelength lambda 2; and so on.
In an operation process, when the optical sensing demodulation system 100 as shown in fig. 4 is used to measure a physical quantity to be measured, a light source signal emitted by the light emitter 11 enters into the optical matcher 13 through the first circulator 12 after entering into each optical sensing demodulation module 10, the first light signal with a preset wavelength as a center wavelength is reflected by the optical matcher 13 into the optical sensor 15 through the first circulator 12 and the second circulator 14, and the rest of the light source signals are transmitted into the next optical sensing demodulation module 10.
Illustratively, the broadband light source signal with the wavelength range of λ 1 to λ n emitted by the light emitter 11 enters the optical matcher 13 of the first optical sensing demodulation module 10 via the first port a and the second port b of the first circulator 12. The optical matcher 13 reflects the first optical signal with the wavelength lambda 1 as the center wavelength to the optical sensor 15 through the second port b of the first circulator 12, the third port c of the first circulator 12, the fourth port d and the fifth port e of the second circulator 14, and transmits the light source signals with the center wavelengths lambda 2 to lambda n to the second optical sensing demodulation module 10, so that the second optical sensing demodulation module 10 can measure the physical quantity to be measured based on the light source signals. Further, after receiving the light source signals with the central wavelength range λ 2 to λ n, the optical matcher 13 of the second optical sensing demodulation module 10 reflects the first light signal with the central wavelength range λ 2 to the optical sensor 15, and transmits the light source signals with the central wavelength range λ 3 to λ n to the third optical sensing demodulation module 10, and so on, which will not be described herein again.
After receiving the first optical signal, the optical sensor 15 in each optical sensing demodulation module 10 reflects a second optical signal to the second photodetector 17 through the fifth port e and the sixth port f of the second circulator 14 according to the measurement condition of the physical quantity to be measured, and transmits a third optical signal to the first photodetector 16; the second optical signal is an optical signal corresponding to a portion of the optical sensor 15 where the reflection spectrum of the optical matcher 13 overlaps (as shown in fig. 2 a); the third optical signal is an optical signal corresponding to a portion where the reflection spectrum of the optical sensor 15 does not overlap with the reflection spectrum of the optical matcher 13 (as shown in fig. 2 b). The first photodetector 16, after receiving the third optical signal, converts the third optical signal into a first electrical signal and sends the first electrical signal to the data processing unit 18; the second photodetector 17, upon receiving the second optical signal, converts the second optical signal into a second electrical signal and sends the second electrical signal to the data processing unit 18. After the data processing unit 18 receives the first electrical signal and the second electrical signal, the differential amplifying device 182 performs a difference operation on the first electrical signal and the second electrical signal, and performs a fixed gain amplifying operation on the electrical signal subjected to the difference operation. After the third electrical signal is obtained, the differential amplifying device 182 sends the third electrical signal to the computing module 20, so that the computing module 20 can determine the shift condition of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15 according to the signal value of the third electrical signal, and further, the computing module 20 can obtain the measurement result of the physical quantity to be measured according to the shift condition of the center wavelength of the optical signal in the reflection spectrum of the optical sensor 15.
In the application, the optical sensor 15 is multiplexed in series by forming the optical sensing demodulation modules 10 into the optical sensing demodulation system 100, so that a plurality of physical quantities to be measured are measured at the same time, and the measurement efficiency of the physical quantities to be measured is improved.
Fig. 5 is a flow chart of a photo-sensor demodulation method according to an embodiment of the application. The method is applied to the optical sensing demodulation system 100 as shown in fig. 4. Specifically, the method includes the following steps S210 to S240.
Step S210: after entering each optical sensing demodulation module 10, the light source signal emitted by the light emitter 11 enters the optical matcher 13 through the first circulator 12, the optical matcher 13 reflects the first light signal taking the preset wavelength as the center wavelength into the optical sensor 15 through the first circulator 12 and the second circulator 14, and transmits the rest of the light source signals into the next optical sensing demodulation module 10.
Step S220: after receiving the first optical signal, the optical sensor 15 reflects the second optical signal to the second photodetector 17 through the second circulator 14 according to the measurement condition of the physical quantity to be measured, and transmits the third optical signal to the first photodetector 16; the second optical signal is an optical signal corresponding to a portion where the reflection spectrum of the optical sensor 15 overlaps the reflection spectrum of the optical matcher 13; the third optical signal is an optical signal corresponding to a portion where the reflection spectrum of the optical sensor 15 does not overlap with the reflection spectrum of the optical matcher 13.
Step S230: the first photodetector 16 converts the third optical signal into a first electrical signal and transmits the first electrical signal into the data processing unit 18, and the second photodetector 17 converts the second optical signal into a second electrical signal and transmits the second electrical signal into the data processing unit 18.
Step S240: the data processing unit 18 obtains a measurement result of the physical quantity to be measured based on the first electrical signal and the second electrical signal.
Specifically, the workflow of the optical sensing demodulation method provided in this embodiment is shown in an explanation of the working principle of the optical sensing demodulation system 100 in fig. 4, and will not be described herein.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
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| CN102243258A (en) * | 2011-04-13 | 2011-11-16 | 华北电力大学 | Modulation type optical current transducer and method thereof for measuring alternating current and direct current |
| CN103604446A (en) * | 2013-11-04 | 2014-02-26 | 清华大学 | Multi-channel fiber bragg grating absolute wavelength demodulation system based on single detector and method thereof |
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| CN202033400U (en) * | 2011-04-13 | 2011-11-09 | 华北电力大学 | Modulation-type optical current transformer |
| JP2014130071A (en) * | 2012-12-28 | 2014-07-10 | Watanabe Seisakusho:Kk | Optical sensing system, optical sensing method, and interrogator based on light zero method |
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| CN103604446A (en) * | 2013-11-04 | 2014-02-26 | 清华大学 | Multi-channel fiber bragg grating absolute wavelength demodulation system based on single detector and method thereof |
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