Distributed Fiber Optic Sensing System for Simultaneous Measurement of Temperature, Strain and Vibration
A distributed optical fiber and sensing system technology, applied in thermometers, measuring heat, measuring devices, etc., can solve problems such as restricting the in-depth application of distributed optical fiber sensing technology and failing to realize simultaneous measurement of optical fiber temperature, strain and vibration, and achieve measurement results. Accurate and reliable, solving the limitation of backscattered signal power, reasonable system structure
Active Publication Date: 2022-03-01
WUHAN UNIV OF TECH
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However, due to the limitation of backscattered signal power, most of the sensing fibers of these independent distributed measurement systems are multimode fibers, and there are relatively few research materials on distributed sensing systems based on single-mode fibers. At most, the sensing system only realizes the simultaneous measurement of two physical quantities (collinear sensing of temperature and strain or collinear sensing of temperature and vibration) on the same optical fiber, and does not realize the simultaneous measurement of three physical quantities of optical fiber temperature, strain, and vibration on one optical fiber. measurement system
The above two points have restricted the in-depth application of distributed optical fiber sensing technology to a certain extent.
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0018] as attached figure 2 As shown, the present embodiment provides a distributed optical fiber sensing system for simultaneous measurement of temperature, strain and vibration, which is provided with a temperature vibration sensing unit and a strain sensing unit, and the temperature vibration sensing unit shares a light source pulse laser 7; The sensing unit uses a frequency-swept laser 1. A host computer 22 and the above-mentioned optical fiber temperature vibration strain sensor connected with the host computer 22 are provided. Optical fiber temperature vibration strain sensor is through ab...
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Abstract
The invention discloses a distributed optical fiber sensing system for simultaneous measurement of temperature, strain and vibration. The system includes: a frequency-sweeping laser, an optical coupler, an optical fiber delay line, a balanced optical detector, a pulse laser, an optical isolator, Optical fiber circulator, bandpass filter, wavelength division multiplexer, single-channel photodetector, dual-channel photodetector, data acquisition card, single-mode sensing fiber. In this system, the temperature sensing unit and the vibration sensing unit share the pulse laser, the frequency-sweeping laser provides light source for the strain sensing unit, and the two light sources are connected through an optical coupler; the wavelength division multiplexer is respectively connected to the optical coupler and Sensing fiber. The sensor system of the invention improves the comprehensiveness of the sensor system for environmental monitoring and has higher practical value.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a distributed optical fiber sensing system for simultaneous measurement of temperature, strain and vibration. Background technique [0002] The key technologies of the existing independent distributed temperature measurement system, distributed strain measurement system, and distributed vibration measurement system have become mature and have industrial-level applications, and the performance parameters of the system (spatial resolution, measurement accuracy, etc.) constantly breaking through. However, due to the limitation of backscattered signal power, most of the sensing fibers of these independent distributed measurement systems are multimode fibers, and there are relatively few research materials on distributed sensing systems based on single-mode fibers. At most, the sensing system only realizes the simultaneous measurement of two physical quantities (colline...
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IPC IPC(8): G01K11/324G01B11/16G01H9/00
CPCG01K11/32G01B11/18G01H9/004G01K11/324
Inventor 张东生普天
Owner WUHAN UNIV OF TECH