CN213956425U - Demodulation system of high-speed fiber grating sensor - Google Patents
Demodulation system of high-speed fiber grating sensor Download PDFInfo
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- CN213956425U CN213956425U CN202022378090.1U CN202022378090U CN213956425U CN 213956425 U CN213956425 U CN 213956425U CN 202022378090 U CN202022378090 U CN 202022378090U CN 213956425 U CN213956425 U CN 213956425U
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Abstract
The utility model provides a demodulation system of high-speed fiber grating sensor, include: the device comprises a laser, an optical fiber circulator, an optical fiber grating sensor, a photoelectric detector, an instrument amplifier, a high-speed sampling circuit and an MCU (microprogrammed control Unit) processor; the utility model has the advantages that: the demodulation of the multi-channel fiber grating sensor can be realized simultaneously, the accuracy is high, the scanning frequency, the scanning step length, the initial scanning point and the like of the laser can be changed according to the obtained parameters such as the central wavelength and the like, and the practical application is facilitated.
Description
Technical Field
The utility model relates to a fiber grating field especially relates to a demodulation system of high-speed fiber grating sensor.
Background
The fiber grating sensor can monitor the stress strain of the local area of the cloth patch in real time, has the advantages of electromagnetic interference resistance, corrosion resistance, high sensitivity, intrinsic passivity, easiness in maintenance, light weight, corrosion resistance and the like, and is more and more widely applied to various large electromechanical, petrochemical and strong electromagnetic interference, flammable, explosive and strong corrosion environments.
The commonly used fiber grating sensor demodulation methods include a grating sensor wavelength demodulation method based on a Fabry-Perot resonant cavity, a strain sensor signal demodulation method based on grating sensor wavelength shift, and a temperature sensor signal demodulation method based on grating sensor wavelength shift, wherein the grating sensor wavelength demodulation method based on the Fabry-Perot resonant cavity is widely applied to practical engineering due to the fact that the implementation method is simple and high in precision, but due to the limitation of the conditions of devices, the fiber grating sensors which can be simultaneously demodulated by the grating sensor wavelength demodulation method based on the Fabry-Perot resonant cavity are fewer in number, the large-scale application of the fiber grating sensors is not facilitated, and the scanning frequency, the scanning step length and other related parameters of a laser cannot be changed.
Disclosure of Invention
In order to solve the above problem, the utility model provides a demodulation system of high-speed fiber grating sensor, this demodulation system includes: the device comprises a laser, an optical fiber circulator, an optical fiber grating sensor, a photoelectric detector, an instrument amplifier, a sampling circuit and an MCU (microprogrammed control Unit) processor;
a laser for emitting a laser beam and generating a trigger signal;
the optical fiber circulator is used for transmitting the laser beam in a single direction;
a fiber grating sensor for reflecting the laser beam;
a photodetector for converting the laser beam into an electrical signal;
the instrumentation amplifier is used for reducing the attenuation of weak input signals;
the sampling circuit is used for quickly acquiring an electric signal at a certain moment;
the output of laser instrument connects in the first input of optic fibre circulator, the input of fiber grating sensor is connected to the first output of optic fibre circulator, the second input of optic fibre circulator is connected to the output of fiber grating sensor, the input of photoelectric detector is connected to the second output of optic fibre circulator, the input of instrumentation amplifier is connected to photoelectric detector's output, the input of sampling circuit is connected to instrumentation amplifier's output, the first input of MCU controller is connected to sampling circuit's output, the input of laser instrument is connected to the first output of MCU controller.
Furthermore, the demodulation system also comprises an optical fiber splitter, wherein the input end of the optical fiber splitter is connected with the first output end of the laser, and the output end of the optical fiber splitter is connected with the first input ends of the plurality of optical fiber circulators and is used for generating a plurality of paths of laser beams.
Furthermore, the demodulation system also comprises a voltage circuit detection unit, and the voltage circuit detection unit is connected with the MCU controller in a bidirectional mode and is used for detecting the safety of a voltage current method in the demodulation system.
Further, the mediation system communicates in NB-IoT and GPRS dual networks.
Further, the laser is of a model S7500.
Furthermore, the demodulation system further comprises a network module output unit, wherein the MCU controller is unidirectionally connected to the network module output unit, namely, the second output end of the MCU controller is connected to the input end of the network module output unit and used for outputting the analysis result of the MCU controller.
The utility model provides a beneficial effect that technical scheme brought is: the demodulation of the multi-channel fiber grating sensor can be realized simultaneously, the accuracy is high, the scanning frequency, the scanning step length, the initial scanning point and the like of the laser can be changed according to the obtained parameters such as the central wavelength and the like, and the practical application is facilitated.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic diagram of a demodulation system of a high-speed fiber grating sensor according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides a demodulation system of high-speed fiber grating sensor.
Referring to fig. 1, fig. 1 is a schematic diagram of a demodulation system of a high-speed fiber grating sensor according to an embodiment of the present invention, which specifically includes: the device comprises a laser, an optical fiber circulator, an optical fiber grating sensor, a photoelectric detector, an instrument amplifier, a sampling circuit and an MCU (microprogrammed control Unit) processor;
a laser for emitting a laser beam and generating a trigger signal;
the optical fiber circulator is used for transmitting the laser beam in a single direction;
a fiber grating sensor for reflecting the laser beam;
a photodetector for converting the laser beam into an electrical signal;
the instrument amplifier is used for reducing the attenuation of input signals, and the input signals are weak generally;
the sampling circuit, preferably a high-speed sampling circuit, is used for acquiring an electrical signal at a certain instant, and generally the electrical signal at the certain instant can be quickly acquired;
the output of laser instrument connects in the first input of optic fibre circulator, the input of fiber grating sensor is connected to the first output of optic fibre circulator, the second input of optic fibre circulator is connected to the output of fiber grating sensor, the input of photoelectric detector is connected to the second output of optic fibre circulator, the input of instrumentation amplifier is connected to photoelectric detector's output, the input of sampling circuit is connected to instrumentation amplifier's output, the first input of MCU controller is connected to sampling circuit's output, the input of laser instrument is connected to the first output of MCU controller.
The demodulation system also comprises an optical fiber splitter, wherein the input end of the optical fiber splitter is connected with the first output end of the laser, and the output end of the optical fiber splitter is connected with the first input ends of the plurality of optical fiber circulators and is used for generating a plurality of paths of laser beams.
The demodulation system further comprises a voltage circuit detection unit, wherein the voltage circuit detection unit is connected with the MCU controller in a two-way mode and used for detecting the safety of a voltage current method in the demodulation system.
The laser is of a model S7500.
The demodulation system also comprises a network module output unit, and the MCU controller is unidirectionally connected with the network module output unit, namely the second output end of the MCU controller is connected with the input end of the network module output unit and used for outputting the analysis result of the MCU controller.
Laser beam transmission to the fiber optic circulator that the laser instrument launched, the fiber optic circulator transmits the laser beam of receiving to the fiber grating sensor, the laser beam reflects back the fiber optic circulator through the fiber grating sensor, the fiber optic circulator transmits the laser beam that reflects back to photoelectric detector, photoelectric detector converts the laser beam into the signal of telecommunication, this signal of telecommunication passes through instrumentation amplifier and inputs sampling circuit, sampling circuit is arranged in acquireing the signal of telecommunication in a certain twinkling of an eye fast, signal of telecommunication input to the MCU controller of gathering, this MCU controller receives the trigger signal of laser instrument transmission, this MCU controller carries out the analysis of center wavelength to the signal of telecommunication of gathering simultaneously, and feed back analysis result to the laser instrument.
And the MCU processor analyzes and processes the sampling data. The system is provided with two paths of optical fiber circulators, an optical fiber grating sensor and a photoelectric detector at present, and can be expanded by meeting the requirement of a detection channel.
After laser beams emitted by the laser pass through the optical fiber branching unit, multiple paths of laser beams can be formed for subsequent expanding of a detection channel.
The laser generates a trigger signal in each scanning period, and the microprocessor analyzes the trigger signal and the signal output by the photoelectric detector to calculate parameters such as the central wavelength. And the laser can be feedback controlled to change the parameters of the scanning frequency, the scanning step length, the initial scanning point and the like.
The system can work in the severe environment and can communicate by using an NB-IoT and GPRS dual-network form. Solar energy is adopted for power supply, and current and voltage safety detection is arranged in the solar energy power supply. This allows the system to be used in remote areas and in places where the terrain is critical.
The utility model has the advantages that: the demodulation of the multi-channel fiber grating sensor can be realized simultaneously, the accuracy is high, the scanning frequency, the scanning step length, the initial scanning point and the like of the laser can be changed according to the obtained parameters such as the central wavelength and the like, and the practical application is facilitated.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A demodulation system of a high-speed fiber grating sensor is characterized in that: the method comprises the following steps: the device comprises a laser, an optical fiber circulator, an optical fiber grating sensor, a photoelectric detector, an instrument amplifier, a sampling circuit and an MCU (microprogrammed control Unit) processor;
a laser for emitting a laser beam and generating a trigger signal;
the optical fiber circulator is used for transmitting the laser beam in a single direction;
a fiber grating sensor for reflecting the laser beam;
a photodetector for converting the laser beam into an electrical signal;
an instrumentation amplifier for reducing attenuation of an input signal;
the sampling circuit is used for acquiring an electric signal at a certain moment;
the output end of the laser is connected with the input end of the optical fiber branching device, the optical fiber branching device is connected with a plurality of groups of photoelectric detection components, each group of photoelectric detection components comprises an optical fiber circulator, an optical fiber grating sensor and a photoelectric detector, the input end of each optical fiber circulator is respectively connected with one output end of the optical fiber branching device, the first output end of the optical fiber circulator in each photoelectric detection component is connected with the input end of the optical fiber grating sensor, the output end of the optical fiber grating sensor is connected with the second input end of the optical fiber circulator, and the second output end of the optical fiber circulator is connected with the input end of the photoelectric detector; the output end of each photoelectric detector is connected to the input end of the instrument amplifier, the output end of the instrument amplifier is connected to the input end of the sampling circuit, the output end of the sampling circuit is connected to the first input end of the MCU controller, and the first output end of the MCU controller is connected to the input end of the laser.
2. A demodulation system for a high speed fiber grating sensor as claimed in claim 1, wherein: the optical fiber splitter is used for generating multiple laser beams.
3. A demodulation system for a high speed fiber grating sensor as claimed in claim 1, wherein: the demodulation system further comprises a voltage circuit detection unit, wherein the voltage circuit detection unit is connected with the MCU controller in a two-way mode and used for detecting the safety of a voltage current method in the demodulation system.
4. A demodulation system for a high speed fiber grating sensor as claimed in claim 1, wherein: the mediation system communicates in the form of an NB-IoT and GPRS dual network.
5. A demodulation system for a high speed fiber grating sensor as claimed in claim 1, wherein: the laser is of a model S7500.
6. A demodulation system for a high speed fiber grating sensor as claimed in claim 1, wherein: the demodulation system also comprises a network module output unit, and the MCU controller is unidirectionally connected with the network module output unit, namely the second output end of the MCU controller is connected with the input end of the network module output unit and used for outputting the analysis result of the MCU controller.
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| CN202022378090.1U CN213956425U (en) | 2020-10-22 | 2020-10-22 | Demodulation system of high-speed fiber grating sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739829A (en) * | 2021-08-19 | 2021-12-03 | 重庆物康科技有限公司 | Fiber grating demodulation method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739829A (en) * | 2021-08-19 | 2021-12-03 | 重庆物康科技有限公司 | Fiber grating demodulation method and system |
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