CN117330113A - FBG demodulation device - Google Patents

FBG demodulation device Download PDF

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Publication number
CN117330113A
CN117330113A CN202311275368.4A CN202311275368A CN117330113A CN 117330113 A CN117330113 A CN 117330113A CN 202311275368 A CN202311275368 A CN 202311275368A CN 117330113 A CN117330113 A CN 117330113A
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Prior art keywords
circuit
signal
electric signal
output
fbg
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CN202311275368.4A
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Chinese (zh)
Inventor
颜欢
曹亦强
李江辉
王钱
陈浩
彭家春
李洲
罗成文
汪治洋
熊伟
陈赟
陈伟东
陆晟祺
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China Shipbuilding Qiteng Technology Wuhan Co ltd
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China Shipbuilding Qiteng Technology Wuhan Co ltd
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Priority to CN202311275368.4A priority Critical patent/CN117330113A/en
Publication of CN117330113A publication Critical patent/CN117330113A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses an FBG demodulation device, comprising: the device comprises a driving circuit, a photoelectric converter, a pre-amplifying circuit, a filter and a digital conversion circuit; the output end of the driving circuit is connected with the FBG sensor and is used for outputting a first optical signal with preset wavelength to the FBG sensor; the photoelectric converter is used for receiving a second optical signal output by the FBG sensor and converting the second optical signal into a first electric signal; the pre-amplifying circuit is used for enhancing the first electric signal to obtain a second electric signal; the filter is used for filtering the second electric signal to obtain a target electric signal; the digital conversion circuit is used for converting the target electric signal into a corresponding digital signal. The invention improves the tunability of the output wavelength and the receiving wavelength of the demodulation device, enhances the demodulation function of the sensor demodulation device and improves the application field range of the demodulation device through the coordination and cooperation among the circuit devices.

Description

FBG demodulation device
Technical Field
The application relates to the technical field of optical fiber sensing, in particular to an FBG demodulation device.
Background
FBG (Fiber Bragg Grating, FBG) sensors have been developed very rapidly in recent years as one of the very important modern optical fiber passive devices. The FBG sensor feeds back the change of external parameters by changing the central wavelength of the reflected light, and the drift amount of the central wavelength is very small, so how to detect the small wavelength change with low cost, high precision and high sensitivity becomes an important technical key point of the project. The excellent sensor can accurately collect external information, but demodulation of the collected information becomes a bottleneck restricting development of information technology.
The FBG demodulating means is a device for demodulating the FBG sensor signal. However, most FBG demodulation devices are limited by the operation characteristics of specific sensors, and it is difficult to adapt to different types of FBG sensors, so that the demodulation function is limited, and the requirements of different application fields cannot be met.
Disclosure of Invention
In order to solve the above problems, the present embodiment provides an FBG demodulation device.
An FBG demodulation device provided in an embodiment of the present application includes: the device comprises a driving circuit, a photoelectric converter, a pre-amplifying circuit, a filter and a digital conversion circuit; wherein,
the output end of the driving circuit is connected with the FBG sensor and is used for outputting a first optical signal with preset wavelength to the FBG sensor;
the photoelectric converter is used for receiving a second optical signal output by the FBG sensor and converting the second optical signal into a first electric signal;
the pre-amplifying circuit is used for enhancing the first electric signal to obtain a second electric signal;
the filter is used for filtering the second electric signal to obtain a target electric signal;
the digital conversion circuit is used for converting the target electric signal into a corresponding digital signal.
Preferably, the driving circuit comprises a DAC chip and a tunable laser; the DAC chip is used for driving the tunable laser to output a first optical signal with a preset wavelength.
Preferably, the driving circuit further comprises a current doubling circuit; the current doubling circuit is used for enhancing the output current of the DAC chip.
Preferably, the driving circuit comprises a broadband light source and a tunable filter; the broadband light source is used for providing light signals with a plurality of wavelengths; the tunable filter is used for filtering the optical signals with the multiple wavelengths and outputting a first optical signal with a preset wavelength.
Preferably, the tunable filter is a fiber bragg grating or a spatial light modulator.
Preferably, the photoelectric converter is a photodiode or a photodetector.
Preferably, the device further comprises a signal conditioning circuit; the signal conditioning circuit is connected with the photoelectric converter and/or the pre-amplifying circuit and is used for carrying out offset calibration, amplification range adjustment and signal linearization on the first electric signal and/or the second electric signal.
Preferably, the driving circuit further comprises an overheat protection circuit, wherein the overheat protection circuit is used for overheat protection of the driving circuit.
Preferably, the drive circuit further comprises an overcurrent protection circuit, wherein the overcurrent protection circuit is used for carrying out overcurrent protection on the drive circuit.
Preferably, the circuit further comprises an output circuit; the output current outputs the digital signal to a target client in a wired and/or wireless mode.
The beneficial effects of the invention are as follows: through coordination cooperation among all circuit devices, the tunability of the output wavelength and the receiving wavelength of the demodulation device is improved, adaptation with various FBG sensors can be well achieved, demodulation of optical signals of the FBG sensors is well achieved, the demodulation function of the demodulation device of the FBG sensors is enhanced, and the application field range of the demodulation device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other 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 FBG demodulation device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first," "second," and "first," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The following description provides various embodiments of the present application, and various embodiments may be substituted or combined, so that the present application is also intended to encompass all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an FBG demodulation device according to an embodiment of the present application. In the embodiment of the present application, the FBG demodulation device 100 includes: a driving circuit 110, a photoelectric converter 120, a pre-amplification circuit 130, a filter 140, and a digital conversion circuit 150; wherein,
the output end of the driving circuit 110 is connected with the FBG sensor 160 and is used for outputting a first optical signal with a preset wavelength to the FBG sensor 160;
the photoelectric converter 120 is configured to receive the second optical signal output by the FBG sensor 160 and convert the second optical signal into a first electrical signal;
a pre-amplifier circuit 130 for enhancing the first electrical signal to obtain a second electrical signal;
a filter 140, configured to perform filtering processing on the second electrical signal to obtain a target electrical signal;
the digital conversion circuit 150 is configured to convert the target electrical signal into a corresponding digital signal.
In the present embodiment, the FBG demodulating means may be divided into an optical path portion and a circuit portion according to the difference of transmission media.
Optical path portion: including the drive circuit 110. The light source emitted by the driving circuit 110 is divided into n paths (12 paths are conventional and can be matched according to practical use conditions) by the splitter, and the light receiving and transmitting isolation devices of each channel couple the light receiving and transmitting paths of the channel to an optical fiber, and the optical fiber is connected with an optical flange interface. The optical flange interface connects the optical path part of the demodulation device with the FBG sensor to be tested. When the FBG sensor receives the light, it reflects the specific light wave back to the photoelectric converter of the demodulation device.
Circuit part: including a photoelectric converter 120, a pre-amplifier circuit 130, a filter 140, and a digital conversion circuit 150. The photoelectric converter 120 may convert the received light into an analog electric signal, i.e., a first electric signal. The first electrical signal, after being amplified by the pre-amplifier circuit 130 and filtered by the filter 140, may be identified and converted into a corresponding digital signal by the digital conversion circuit 150. It should be noted that, since the electrical signal output by the photoelectric converter 120 is small, the pre-amplifier circuit 130 needs to be provided to amplify the weak electrical signal output by the photoelectric converter 120, so as to improve the strength and the measurability of the signal. In addition, the pre-amplifier circuit 130 herein requires low noise and high gain characteristics to ensure accuracy and sensitivity. The filter 140 is specifically configured to remove or select signals within a specific frequency range from the second electrical signal. The filter 140 may be an RC filter formed by a capacitor, an inductor, an operational amplifier, or the like, or may be a digital filter. The digital conversion circuit 150 may convert the target electrical signal into a corresponding digital signal, and may then determine the location of the spectral peak based on a correlation algorithm. In addition, the optical path portion and the circuit portion need to be kept synchronous, whereby the position of the spectral peak can be found more accurately. The circuits and the devices are connected in a wired or wireless mode.
In one embodiment, the drive circuit includes a DAC chip and a tunable laser; the DAC chip is used for driving the tunable laser to output a first optical signal with a preset wavelength.
The function of a DAC chip, i.e., a digital-to-analog converter chip, is to convert digital codes into a series of discrete stepped voltages or currents, which are the core devices for analog output and control. Here, the driving current may be outputted through the DAC chip to drive the tunable laser to output the first optical signal of the preset wavelength. In order to achieve accurate wavelength tuning, a feedback mechanism is also typically built between the DAC chip and the tunable laser. The feedback mechanism can monitor the characteristics of the tunable laser output and modify the drive current as needed to achieve the desired wavelength tuning effect.
Considering the sensing principle of FBG sensors: a grating (grating period Λ) with periodically distributed spatial phase is engraved in the fiber core, when the light emitted by the light source passes through the fiber grating, part of the selected light (reflected light, center wavelength λb) is reflected back, and the rest of the light (transmitted light) is transmitted, wherein the wavelength of the reflected light is related to the effective refractive index neff of the fiber core and the grating period Λ as follows:
λB＝2neffΛ；
the effective refractive index neff of the fiber core and the grating period lambda are both sensitive to external parameters, and when the external acceleration, strain, temperature and other parameters change, the parameters can be detected and cause the drift of the central wavelength of the fiber grating sensor.
In this embodiment, the first optical signal with the preset wavelength may be a series of optical signals with continuous or discontinuous wavelengths. After the first optical signal enters the FBG sensor, when the external acceleration, the external strain, the external temperature and other parameters change, the central wavelength of the reflected light changes.
In one embodiment, the driving circuit further includes a current doubler circuit; the current doubler circuit is used for enhancing the output current of the DAC chip.
In this embodiment, considering that the driving capability of the driving current outputted from the DAC chip is insufficient in some cases, a current doubler circuit may be added to the output terminal of the DAC chip to enhance the driving capability, so as to ensure that a stable and accurate driving current is provided.
In one embodiment, the drive circuit includes a broadband light source and a tunable filter; the broadband light source is used for providing light signals with a plurality of wavelengths; the tunable filter is used for filtering the optical signals with a plurality of wavelengths and outputting a first optical signal with a preset wavelength.
In this implementation, the broadband light source may be a light source capable of emitting light signals over a broad range of wavelengths. By way of example, it may be a white light LED, deuterium lamp, broadband laser diode, or supercontinuum laser, etc. Broadband light sources are capable of providing a continuous spectrum of light, including multiple wavelengths, and with relatively uniform light intensities. The tunable filter is used to selectively screen or adjust the wavelength range of the optical signal. Tuning of the wavelength can be achieved by adjusting parameters of the filter (such as driving voltage, temperature or mechanical adjustment), so that optical signals with specific wavelengths can be selectively passed or blocked, and continuous spectrum screening can be achieved. On the basis, the control driving parameters can tune and output light with specific wavelength.
Depending on the type of filter, the drive circuit needs to provide appropriate voltage, current or temperature control signals depending on the application requirements. These drive signals can affect the operating characteristics of the tunable filter, thereby enabling precise tuning of the wavelength. In the application of the broadband light source and the tunable filter, the broadband light signal emitted by the broadband light source is subjected to wavelength selection and tuning through the tunable filter, only the light signal in the wavelength range can pass through the filter, and the light signals of other wavelengths can be filtered, so that the selective transmission or measurement of the light signal in the specific wavelength range can be realized. The combination of the broadband light source and the tunable filter improves the flexibility and accuracy of the driving circuit and facilitates the generation of broadband light signals of different wavelengths.
In one embodiment, the tunable filter is a fiber bragg grating or a spatial light modulator.
Under active control, the spatial light modulator can modulate a certain parameter of the light field through liquid crystal molecules, for example, modulate the amplitude of the light field, modulate the phase through refractive index, modulate the polarization state through rotation of a polarization plane, or realize conversion of incoherent-coherent light, so that certain information is written into the light wave, and the purpose of light wave modulation is achieved. The spatial light modulator may be a liquid crystal light valve, for example.
In one embodiment, the photoelectric converter is a photodiode or a photodetector.
In the present embodiment, the photoelectric converter has high sensitivity and quick response characteristics. The photoelectric converter is connected with the output end of the FBG sensor. After the first optical signal is screened by the FBG sensor, the reflected light (second optical signal) enters the photoelectric converter. Photoelectric converters can convert incident photons into corresponding charges or currents through the photoelectric effect. Here, an optical fiber coupler may be further provided between the photoelectric converter and the FBG sensor to reduce transmission loss of the optical signal.
In one embodiment, the FBG demodulation device further comprises a signal conditioning circuit; the signal conditioning circuit is connected with the photoelectric converter and/or the pre-amplifying circuit and is used for carrying out offset calibration, amplification range adjustment and signal linearization on the first electric signal and/or the second electric signal.
In this implementation, the signal conditioning circuit may be used to further process and adjust the collected optical signal to accommodate the requirements of subsequent circuits or systems. For example, gain control, bias calibration, amplification range adjustment, signal linearization, etc. are implemented to ensure signal quality and reliability.
In one embodiment, the FBG demodulation device further comprises an overheat protection circuit for overheat protecting the driving circuit.
In this embodiment, the overheat protection circuit may include a TEC controller ADN8830. The TEC controller ADN8830 has a temperature control function, and can maintain a set operating temperature by measuring the temperature of the laser diode and feedback-controlling. The temperature sensor adopts an accurate temperature sensor (such as a thermistor) to monitor the actual temperature of the laser diode, controls the laser diode according to a set temperature threshold value, and adopts corresponding protection measures when the safety limit is exceeded.
In one embodiment, the FBG demodulation device further comprises an over-current protection circuit for over-current protection of the driving circuit.
In this embodiment, the over-current protection circuit may include a TEC controller ADN8830.TEC controller ADN8830 can monitor the current and take corresponding protective measures when a safety limit is exceeded, such as reducing the current or interrupting the current source.
In one embodiment, the FBG demodulation device further comprises an output circuit; the output current outputs the digital signal to the target client by wired and/or wireless means.
The output modes can be classified into wired transmission (such as wires, cables, optical fibers, etc.) and wireless transmission (such as WIFI, mobile communication network, bluetooth, satellite, etc.) according to the transmission medium. Different output modes have different characteristics and application ranges, and proper output modes can be selected according to specific requirements. Here, the demodulated data is transmitted outwards by using a CAN communication, ethernet communication and 4G/5G (or WIFI) mode, so as to realize information interconnection. The target client may be a computer terminal with a display screen connected with the FBG demodulation device through a wire or a wireless connection, or may be a display part of the FBG demodulation device itself. It should be noted that, the display screen of the computer terminal or the display component of the FBG demodulation device may be configured with a corresponding information input port, such as a touch screen, and a processor is connected to the display component. After receiving the corresponding control command, the input port may perform a series of operations, such as changing a display mode of the data, adjusting a display layout, and the like.
In some embodiments, the FBG demodulation device further comprises a power circuit. A power circuit is a circuit used to provide the power required by a device or system. The input of the power circuit is typically connected to a power line or power adapter from which power is drawn. The obtained electric energy needs to be filtered by an input filter circuit to remove noise and interference from a power supply circuit so as to ensure the stability and reliability of the power supply circuit. The voltage and power consumption required by each circuit and its corresponding control chip are different throughout the FBG demodulation device, so the power supply circuit generally needs to regulate the output voltage, such as using voltage regulators with linear voltage regulators and switching voltage regulators to meet the power requirements of the device or system. The filtering circuit can be used for removing high-frequency noise and ripple waves in direct current at the output end of the power supply, so that the output voltage is more stable and pure. In addition, the power supply circuitry typically includes some protection mechanism to ensure safe operation of the device or system. Such as overvoltage protection, overcurrent protection, short-circuit protection, etc. In addition, the power supply circuit can also provide a current limiting function to control the magnitude of the output current. When designing and constructing a power supply circuit, factors such as voltage, current, power, efficiency, reliability and safety need to be comprehensively considered.
According to the method and the device, the output wavelength and the receiving wavelength of the demodulation device are improved in tunability through coordination among circuit devices, adaptation with various FBG sensors can be well achieved, demodulation of optical signals of the FBG sensors is well achieved, demodulation functions of the demodulation device of the FBG sensors are enhanced, and application field range of the demodulation device is improved.
It will be apparent to those skilled in the art that the embodiments of the present application may be implemented in software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware capable of performing a specific function, either alone or in combination with other components, such as Field programmable gate arrays (Field-Programmable Gate Array, FPGAs), integrated circuits (Integrated Circuit, ICs), etc.
The processing units and/or modules of the embodiments of the present application may be implemented by an analog circuit that implements the functions described in the embodiments of the present application, or may be implemented by software that executes the functions described in the embodiments of the present application.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.

Claims (10)

1. An FBG demodulation device, comprising: the device comprises a driving circuit, a photoelectric converter, a pre-amplifying circuit, a filter and a digital conversion circuit; wherein,
the output end of the driving circuit is connected with the FBG sensor and is used for outputting a first optical signal with preset wavelength to the FBG sensor;
the photoelectric converter is used for receiving a second optical signal output by the FBG sensor and converting the second optical signal into a first electric signal;
the pre-amplifying circuit is used for enhancing the first electric signal to obtain a second electric signal;
the filter is used for filtering the second electric signal to obtain a target electric signal;
the digital conversion circuit is used for converting the target electric signal into a corresponding digital signal.
2. The apparatus of claim 1, wherein the drive circuit comprises a DAC chip and a tunable laser; the DAC chip is used for driving the tunable laser to output a first optical signal with a preset wavelength.
3. The apparatus of claim 2, wherein the drive circuit further comprises a current doubler circuit;
the current doubling circuit is used for enhancing the output current of the DAC chip.
4. The apparatus of claim 1, wherein the drive circuit comprises a broadband light source and a tunable filter; the broadband light source is used for providing light signals with a plurality of wavelengths; the tunable filter is used for filtering the optical signals with the multiple wavelengths and outputting a first optical signal with a preset wavelength.
5. The apparatus of claim 4, wherein the tunable filter is a fiber bragg grating or a spatial light modulator.
6. The apparatus of claim 1, wherein the photoelectric converter is a photodiode or a photodetector.
7. The apparatus of claim 1, further comprising a signal conditioning circuit; the signal conditioning circuit is connected with the photoelectric converter and/or the pre-amplifying circuit and is used for carrying out offset calibration, amplification range adjustment and signal linearization on the first electric signal and/or the second electric signal.
8. The apparatus of claim 1, further comprising an overheat protection circuit for overheat protecting the drive circuit.
9. The apparatus of claim 1, further comprising an over-current protection circuit for over-current protection of the drive circuit.
10. The apparatus of claim 1, further comprising an output circuit; the output current outputs the digital signal to a target client in a wired and/or wireless mode.
CN202311275368.4A 2023-09-28 2023-09-28 FBG demodulation device Pending CN117330113A (en)

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Application Number Priority Date Filing Date Title
CN202311275368.4A CN117330113A (en) 2023-09-28 2023-09-28 FBG demodulation device

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Application Number Priority Date Filing Date Title
CN202311275368.4A CN117330113A (en) 2023-09-28 2023-09-28 FBG demodulation device

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