A measuring device and method for a large-scale fiber grating sensor

A fiber grating and measuring device technology, which is applied in the direction of measuring devices, converting sensor output, and using optical devices to transmit sensing components, etc., can solve the problems of increasing the number of channels, high cost of use, and short measuring distance, etc., achieving a large number and low cost Effect of low and simplified layout method

Active Publication Date: 2020-08-14
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose a large-scale fiber grating sensor measuring device and method, to overcome the existing multi-channel fiber grating sensor demodulator based on wavelength tunable lasers and further increase the number of channels Constrained by the synchronous increase of optical splitters, optical fiber connectors, transmission optical fibers, photodetectors, and analog-to-digital converters, the existing low-reflectivity fiber grating sensor demodulators based on optical frequency domain reflectometers have high cost and long measurement distances. Short and other questions

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  • A measuring device and method for a large-scale fiber grating sensor
  • A measuring device and method for a large-scale fiber grating sensor
  • A measuring device and method for a large-scale fiber grating sensor

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Embodiment Construction

[0026] A measurement device and method for a large-scale fiber grating sensor disclosed in the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like figure 1 A measurement device for a large-scale fiber grating sensor is shown, including a scanning laser 1, a polarization-maintaining fiber coupler 2, a transmission fiber 3a, a fiber grating sensor module, a fiber isolator 8, a Michelson fiber interferometer 9, and a 45° pair A shaft connection 10 , a polarization beam splitter 11 , a first photodetector 12 a , a second photodetector 12 b , a third photodetector 12 c , and a signal acquisition and processing unit 13 .

[0028] The fiber grating sensor module includes a first single-mode fiber coupler 4a, a first Faraday rotating mirror 7a, an optical splitter 5, and a fiber grating sensor 6. The fiber grating sensor module is used to measure the optical signal, and then output the sensing...

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Abstract

The invention discloses a large-scale measuring device and method for optical fiber grating sensors. An optical splitter and optical frequency domain reflection are used for large scale measuring of the optical fiber grating sensors, hundreds of measurement channels are achieved, the number of photodetectors, transmission optical fibers, analog-to-digital converters and the like is not increased,and special customized weak reflectance optical fiber grating sensors are not required; polarization-maintaining optical fiber couplers, the transmission optical fibers, Faraday rotating reflecting mirrors, polarizing beam splitters and 45-degree on-axis connection are used, optical frequency domain reflection remote measurement for the optical fiber grating sensors is achieved, the measurement distance is increased, and the sensor layout method is simplified.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a measuring device and method for a large-scale optical fiber grating sensor. Background technique [0002] Fiber Bragg grating sensors have the advantages of anti-electromagnetic interference, intrinsically safe, small size, easy reuse, good stability, easy remote measurement, easy to implant internal measurement of structures, etc. It has important applications in condition monitoring in fields such as geology and geology. With the expansion of the monitoring range, the number of FBG sensors is increasing; how to measure large-scale FBG sensors under the condition of hardware resources and cost constraints has become one of the keys to the application of FBG sensors. [0003] Existing methods for large-scale fiber grating sensor measurement mainly include: multi-channel fiber grating sensor demodulator based on wavelength tunable laser, and weak fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00G01D5/26
CPCG01D5/268G01D18/00
Inventor 唐才杰王学锋蓝天卞贺明王明超崔留住
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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