CN105806378A - A fiber grating demodulation device - Google Patents

Abstract

The invention provides a fiber grating demodulation device, which belongs to the field of fiber demodulation. Including: a data demodulation module, a signal conditioning module, a data acquisition module, a data calculation module and a data display module; the data demodulation module is connected with the signal conditioning module and the data acquisition module respectively; the signal conditioning module also It is connected with the data acquisition module, and the data calculation module is respectively connected with the data acquisition module and the data display module. By setting the data demodulation module, signal conditioning module, data acquisition module and data calculation module, the accuracy and precision of the fiber grating demodulation device are improved, and the data distortion caused by external interference in the transmission process is reduced, and the reduction is reduced. The error range is widened, the authenticity of the data is better guaranteed, and the situation of the measured object is better reflected.

Description

A fiber grating demodulation device

technical field

The invention relates to the field of fiber grating demodulation, in particular to a fiber grating demodulation device.

Background technique

At present, fiber gratings are more and more widely used in the field of sensing technology. Compared with other types of sensors, fiber grating sensors have the characteristics of anti-electromagnetic interference, anti-corrosion, and good reliability. In addition, fiber gratings can convert external strain signals, such as stress signals, strain signals, vibration signals, and temperature change signals. Its wavelength encoding characteristics and reusability are unmatched by other types of sensors. Therefore, Demodulating the wavelength-encoded signal of the fiber grating plays a crucial role.

In the related art, the fiber grating demodulator demodulates the drive signal through the demodulation data unit, transmits it to the computer equipment for calculation, and solves the external strain signal.

In the actual operation process, due to the complex and changeable environment in the roadway, the demodulated data drive signal may be distorted by external interference during transmission, making the obtained demodulated data inaccurate and unable to give people timely information. provide accurate monitoring data.

Contents of the invention

In view of this, the purpose of the embodiments of the present invention is to provide a fiber grating demodulation device, to improve the accuracy and precision of the fiber grating demodulation device, reduce the situation of data distortion caused by external interference during transmission, The error range is narrowed, the authenticity of the data is better guaranteed, and the situation of the measured object is better reflected.

In a first aspect, an embodiment of the present invention provides a fiber grating demodulation device, including: a data demodulation module, a signal conditioning module, a data acquisition module, a data calculation module, and a data display module;

The data demodulation module is respectively connected with the signal conditioning module and the data acquisition module;

The signal conditioning module is also connected to the data acquisition module, and the data calculation module is respectively connected to the data acquisition module and the data display module;

The data demodulation module is used to detect the demodulation signal and transmit the detected demodulation data to the signal conditioning module;

The signal conditioning module is configured to amplify the received demodulated data detected by the data demodulation module;

The data collection module is used to collect the demodulation data of the data demodulation module and the amplified demodulation data of the signal conditioning module, and transmit the collected data to the data calculation module;

The data calculation module is used to respectively receive the data sent by the data demodulation module and the data acquisition module, and calculate the received data;

The data display module is used to display the data calculated by the data calculation module.

In combination with the first aspect, the embodiment of the present invention provides a first possible implementation of the first aspect, wherein the data demodulation module includes: a broadband light source, a tunable filter, a fiber coupler, a fiber grating sensor, a photoelectric detector;

The tunable filter is respectively connected with the broadband light source, the fiber coupler and the data acquisition module;

The optical fiber sensor is respectively connected with the optical coupler and the photodetector;

The photodetector is also connected to the signal conditioning module;

The broadband light source is used to send broadband light to the tunable filter;

The tunable filter is used to convert the input broadband light into a narrow linewidth laser, and output the narrow linewidth laser to an optical coupler;

The optical fiber coupler is used to couple and redistribute the optical signal in transmission in the coupling area;

The fiber grating sensor is used to form a reflection spectrum according to the narrow linewidth laser input by the tunable filter;

The photodetector is used to detect the reflection spectrum formed by the fiber grating in real time, and transmit the reflection spectrum to the signal conditioning module.

With reference to the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the signal conditioning module includes: a signal receiver, a signal conditioning circuit, and a signal transmitter;

The signal conditioning circuit is connected to the signal receiver and the signal transmitter respectively;

The signal receiver is configured to receive the demodulated data detected by the data demodulation module, and send the received demodulated data to the signal conditioning circuit;

The signal conditioning circuit is configured to condition the demodulated signal sent by the signal receiver, and send the conditioned demodulated data to the data acquisition module through the signal transmitter.

In combination with the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the data calculation module includes: a data management unit and a regression calculation unit;

The data management unit is respectively connected with the regression calculation unit and the data acquisition module;

The data management unit is configured to receive the data sent by the data acquisition module, and send the data to a regression calculation unit;

The regression calculation unit is configured to receive the data sent by the data management unit, obtain an analysis result through calculation, and send the analysis result to the data management unit.

With reference to the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the data calculation module further includes a data storage unit;

The data storage unit is connected to the data management unit;

The data storage module is used to store the data received by the data management module.

With reference to the first aspect, the embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein, the optical fiber coupler adopts a 4-channel coupler, an 8-channel coupler, a 16-channel coupler or a 32-channel coupler device.

With reference to the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the optical fiber coupler is X-shaped, Y-shaped, star-shaped, or tree-shaped.

With reference to the first aspect, the embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the data display module is an LED display.

With reference to the first aspect, the embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the fiber grating sensor is a bolt sensor.

With reference to the first aspect, the embodiment of the present invention provides a ninth possible implementation manner of the first aspect, wherein the anchor sensor includes: an optical fiber grating, an intermediate layer, and an anchor body;

The fiber grating is arranged at the center of the anchor rod body, and the anchor rod body and the fiber grating are connected through the intermediate layer.

A fiber grating demodulation device provided by an embodiment of the present invention improves the accuracy and precision of the fiber grating demodulation device by setting a data demodulation module, a signal conditioning module, a data acquisition module, and a data calculation module, and reduces the During the transmission process, data distortion occurs due to external interference, which reduces the error range, better ensures the authenticity of the data, and better reflects the situation of the measured object.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 shows a schematic structural diagram of a fiber grating demodulation device provided by an embodiment of the present invention;

In accompanying drawing 1, the parts list represented by each label is as follows:

10: Data demodulation module, 11: Broadband light source,

12: Tunable filter, 13: Fiber coupler,

14: fiber grating sensor, 15: photodetector,

16: Signal conditioning module, 17: Data acquisition module,

18: data calculation module, 19: data display module.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Considering that in the related technology, the fiber grating demodulator demodulates the drive signal through the demodulation data unit, transmits it to the computer equipment for calculation, and solves the external strain signal. In the actual operation process, due to the complex and changeable environment in the roadway, the demodulated data drive signal may be distorted by external interference during transmission, making the obtained demodulated data inaccurate and unable to give people timely information. provide accurate monitoring data. Based on this, an embodiment of the present invention provides a fiber grating demodulation device, which will be described below through an embodiment.

Example

In order to obtain more accurate demodulated data, and to solve and display the demodulated data. 1, the present embodiment provides a fiber grating demodulation device, including: a data demodulation module 10, a signal conditioning module 16, a data acquisition module 17, a data calculation module 18 and a data display module 19;

Data demodulation module 10 is connected with signal conditioning module 16 and data acquisition module 17 respectively;

Signal conditioning module 16 is also connected with data acquisition module 17, and data calculation module 18 is connected with data acquisition module 17 and data display module 19 respectively;

The data demodulation module 10 is used to detect the demodulation signal and transmit the detected demodulation data to the signal conditioning module 16;

A signal conditioning module 16, configured to amplify the demodulated data detected by the received data demodulation module 10;

The data collection module 17 is used to collect the demodulation data of the data demodulation module 10 and the demodulation data amplified by the signal conditioning module 16, and transmit the collected data to the data calculation module 18;

The data calculation module 18 is used to respectively receive the data sent by the data demodulation module 10 and the data acquisition module 17, and solve the received data;

The data display module 19 is used for displaying the data calculated by the data calculation module 18 .

In order to demodulate the measurement data of the fiber grating sensor 14 . This embodiment provides a fiber grating demodulation device. The data demodulation module 10 includes: a broadband light source 11, a tunable filter 12, a fiber coupler 13, a fiber grating sensor 14, and a photodetector 15;

The tunable filter 12 is respectively connected with the broadband light source 11, the fiber coupler 13 and the data acquisition module 17;

Optical fiber sensor is connected with optical coupler and photodetector 15 respectively;

Photodetector 15 is also connected with signal conditioning module 16;

Broadband light source 11, used to send broadband light to tunable filter 12;

The tunable filter 12 is used to convert the input broadband light into a narrow linewidth laser, and output the narrow linewidth laser to the optical coupler;

The optical fiber coupler 13 is used to couple and redistribute the optical signal in transmission in the coupling area;

The fiber grating sensor 14 is used to form a reflection spectrum according to the narrow linewidth laser input by the tunable filter 12;

The photodetector 15 is used to detect the reflection spectrum formed by the fiber grating in real time, and transmit the reflection spectrum to the signal conditioning module 16 .

It can be seen from the above embodiments that the broadband light source 11 emits broadband light to the tunable filter 12, and is demodulated by the tunable filter 12 to generate narrow-band light passes with different central wavelengths, which are then split by a plurality of fiber couplers 13, and the optical fiber The coupler 13 can separate multiple optical paths, and the reflected light is photoelectrically converted by the photodetector 15 to obtain a reflection spectrum, which is then sent to the signal conditioning module 16 .

In order to condition the signal sent by the data demodulation module 10 . This embodiment provides a fiber grating demodulation device, the signal conditioning module 16 includes: a signal receiver, a signal conditioning circuit and a signal transmitter;

The signal conditioning circuit is respectively connected with the signal receiver and the signal transmitter;

A signal receiver, configured to receive the demodulated data detected by the data demodulation module 10, and send the received demodulated data to the signal conditioning circuit;

The signal conditioning circuit is used to condition the demodulated signal sent by the signal receiver, and send the conditioned demodulated data to the data acquisition module 17 through the signal transmitter.

It can be seen from the above embodiments that after the signal receiver receives the signal sent by the data demodulation module 10, it goes through the conditioning of the signal conditioning circuit, and sends the conditioned signal to the data acquisition module 17 through the signal transmitter.

In order to manage and calculate the demodulated data, obtain the required data to evaluate the measured data. This embodiment provides a fiber grating demodulation device, and the data calculation module 18 includes: a data management unit and a regression calculation unit;

The data management unit is connected with the regression calculation unit and the data acquisition module 17 respectively;

The data management unit is used to receive the data sent by the data acquisition module 17, and send the data to the regression calculation unit;

The regression calculation unit is used to receive the data sent by the data management unit, obtain the analysis result through calculation, and send the analysis result to the data management unit.

It can be seen from the above embodiments that the setting of the data management unit and the regression calculation unit realizes the management and calculation of the demodulated data, and the data management unit can also manage the data obtained after the regression calculation to realize the measurement data Compared with the data after regression calculation, the data can be analyzed more comprehensively.

In order to archive the data after measurement and the data after regression calculation, the present embodiment provides a fiber grating demodulation device, and the data calculation module 18 also includes a data storage unit;

The data storage unit is connected with the data management unit;

The data storage module is used to store the data received by the data management module.

It can be seen from the above embodiments that the data storage module stores a large amount of measurement data and data after regression calculation. Not only can the data results be seen in time after the measurement, but also the previous measurement results can be queried after multiple measurements. It is convenient to compare data from different periods.

In order to realize the effective connection of the optical fiber, the splitting of the optical signal is realized. This embodiment provides a fiber grating demodulation device, and the fiber coupler 13 is a 4-channel coupler, an 8-channel coupler, a 16-channel coupler or a 32-channel coupler.

Optical fiber coupler 13 is an optical device that realizes the distribution or combination of optical signal power between different optical fibers. It is formed by the mutual exchange of guided wave energy in the fiber core area adjacent to the fiber surface of different optical fibers. It can be divided into multi-mode optical fiber couplers according to the type of optical fiber used. Optical fiber, single-mode optical fiber and polarization-maintaining optical fiber coupler 13. The optical fiber coupler 13 is a device for detachable connection between the optical fiber and the optical fiber. It can be coupled to the receiving optical fiber to the maximum extent, and its intervention in the optical link can minimize the impact on the system. Generally, fiber optic couplers 13 are divided into X-shape, Y-shape, star-shape and tree-shape.

In order to see the results calculated by the data calculation module 18 in a timely manner, this embodiment provides a fiber grating demodulation device, and the data display module 19 is an LED display.

It can be seen from the above embodiments that the LED display is connected with the data calculation module 18, and can display the data calculated by the data calculation module 18 in time, so that people can make timely adjustments according to the data.

In order to enable the optical fiber sensor to be applied under relatively harsh environmental conditions, and not to be damaged, to ensure the accuracy of measurement. This embodiment provides a fiber grating demodulation device, and the fiber grating sensor 14 is a bolt sensor.

It can be seen from the above embodiments that the combination of the fiber optic sensor and the anchor rod can not only realize the measurement of the state of the roadway, but also play a certain role in supporting the roadway, and the combination of the fiber optic sensor and the fiber optic sensor is effective. It protects the sensor from being scratched under harsh conditions, thus ensuring the accuracy of the measurement data.

In order to enable the sensor to work normally in the harsh environment in the roadway, and to make the measured data more accurate, it is convenient for the test system to analyze the data, so as to ensure the construction safety in the roadway.

This embodiment provides a fiber grating demodulation device, and the bolt sensor includes: a fiber grating, an intermediate layer, and a bolt body;

The fiber grating is arranged at the center of the anchor rod body, and the anchor rod body and the fiber grating are connected through an intermediate layer.

From the above embodiments, it can be seen that through the arrangement of the fiber grating, the intermediate layer and the anchor rod, the fiber grating and the anchor rod are effectively integrated into one body. Such an integrated setting of the fiber grating embedded in the anchor rod, along with the anchor rod The rod is driven into the rock formation, and the fiber grating is also driven into the rock formation, which protects the fiber grating and helps the fiber grating to better perceive the stress and strain data of the bolt. The grating is etched on the optical fiber, and set isometrically. In addition, the integrated setting of the anchor rod and the fiber grating can also improve the accuracy and precision of the measured data, facilitate the comprehensive monitoring and analysis of the system, obtain more comprehensive data in the roadway, and ensure the safety of personnel in the roadway. Reduce the probability of safety accidents and better ensure construction safety.

To sum up, by setting the data demodulation module, signal conditioning module, data acquisition module and data calculation module, the accuracy and precision of the fiber grating demodulation device are improved, and the data generated by external interference during transmission is reduced. In the case of distortion, the error range is narrowed, the authenticity of the data is better guaranteed, and the situation of the measured object is better reflected.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a fiber grating demodulation device, it is characterised in that including: data demodulation module, Signal-regulated kinase, data acquisition module, data computation module and data disaply moudle；

Described data demodulation module is connected with described Signal-regulated kinase and described data acquisition module respectively；

Described Signal-regulated kinase is also connected with described data acquisition module, and described data computation module is connected with described data acquisition module and described data disaply moudle respectively；

Described data demodulation module, for detecting demodulation signal and the demodulating data detected being transferred to described Signal-regulated kinase；

Described Signal-regulated kinase, the described demodulating data for the described data demodulation module received is detected is amplified processing；

Described data acquisition module, is used for the demodulating data after gathering the demodulating data of described data demodulation module and the amplification of described Signal-regulated kinase the data transmission extremely described data computation module that will collect；

The data received for receiving described data demodulation module and the data of described data acquisition module transmission respectively, and are resolved by described data computation module；

Described data disaply moudle, for showing the data that described data computation module calculates.

2. fiber grating demodulation device according to claim 1, it is characterised in that described data demodulation module includes: wideband light source, tunable optic filter, fiber coupler, fiber-optic grating sensor, photodetector；

Described tunable optic filter is connected with described wideband light source, described fiber coupler and described data acquisition module respectively；

Described Fibre Optical Sensor is connected with described light bonder and described photodetector respectively；

Described photodetector is also connected with described Signal-regulated kinase；

Described wideband light source, for sending broadband light to described tunable optic filter；

Described tunable optic filter, for converting narrow-linewidth laser to, and by described narrow-linewidth laser output to light bonder by the broadband light of input；

Described fiber coupler, for carrying out coupling and reallocating in coupled zone by the optical signal in transmission；

Described fiber-optic grating sensor, forms reflectance spectrum for the narrow-linewidth laser inputted according to described tunable optic filter；

Described photodetector, the reflectance spectrum that fiber grating described in real-time detection is formed, and by described reflectance spectrum transmission to Signal-regulated kinase.

3. fiber grating demodulation device according to claim 1, it is characterised in that described Signal-regulated kinase includes: signal receiver, signal conditioning circuit and signal projector；

Described signal conditioning circuit is connected with described signal receiver and described signal projector respectively；

Described signal receiver, for receiving the described demodulating data that described data demodulation module detects, and is sent to described signal conditioning circuit by the described demodulating data received；

Described signal conditioning circuit, for nursing one's health the described demodulation signal that described signal receiver sends, and is sent to described data acquisition module by the demodulating data after conditioning through described signal projector.

4. fiber grating demodulation device according to claim 2, it is characterised in that described data computation module includes: Data Management Unit, regression Calculation unit；

Described Data Management Unit is connected with described regression Calculation unit and described data acquisition module respectively；

Described Data Management Unit, for receiving the data that described data acquisition module sends, and sends the data to regression Calculation unit；

Described regression Calculation unit, for receiving the data that described Data Management Unit sends, through calculating analysis result, and is sent to Data Management Unit by described analysis result.

5. fiber grating demodulation device according to claim 2, it is characterised in that described data computation module also includes data storage cell；

Described data storage cell is connected with described Data Management Unit；

Described data memory module, for storing the data that described data management module receives.

6. fiber grating demodulation device according to claim 2, it is characterised in that described fiber coupler adopts 4 passage bonders, 8 passage bonders, 16 passage bonders or 32 passage bonders.

7. fiber grating demodulation device according to claim 1, it is characterised in that described fiber coupler is X-shaped, Y shape, star and tree-like.

8. fiber grating demodulation device according to claim 1, it is characterised in that described data disaply moudle is light-emitting diode display.

9. fiber grating demodulation device according to claim 1, it is characterised in that described fiber-optic grating sensor is anchor sensor.

10. fiber grating demodulation device according to claim 9, it is characterised in that described anchor sensor includes: fiber grating, intermediate layer and anchor rod body；

Described fiber grating is arranged on the center position of described anchor rod body, and described anchor rod body is connected by described intermediate layer with described fiber grating.