Sensing system and monitoring method for oxidative state monitoring of sic substances based on the sensing characteristics of lpfg
A technology of oxidation state and sensing system, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of unrealized monitoring of corrosion state of carbon fiber composite materials, and achieve distributed measurement, high resolution, and improved measurement accuracy.
Active Publication Date: 2019-10-11
SHANGHAI UNIV
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However, none of the above applications has realized the monitoring of the corrosion state of carbon fiber composite materials.
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[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0026] Such as Figure 1-5 As shown, a sensing system for monitoring the oxidation state of SiC substances based on the sensing characteristics of LPFG includes a broadband light source 1, a 1×N-type fiber coupler 2, an optical fiber connector 3, a sensing fiber 4, and an oxidation sensing system for LPFG silicon carbide substances. Sensing probe 5, N×1 type optical switch 6, spectrometer 7 and computer 8; The 1×N type optical fiber coupler 2 includes a 1×N type optical fiber coupler input port 9 and N 1×N type optical fiber couplers The output end 10, wherein the input end 9 of the 1×N type fiber optic coupler is connected to the broadband light source 1, and the output ends 10 of N 1×N type fiber optic couplers are respectively connected to the LPFG at different detection positions through the optical fiber connector 3 and the sensing fiber 4 The inpu...
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The present invention discloses a SiC material oxidation state monitoring method and sensor system based on LPFG sensing properties, and belongs to the field of health monitoring of composite structures. The method divides the SiC oxidation state monitoring of a SiC composite material in a service process of into two aspects, namely carbon and oxygen reaction process monitoring in SiC material oxidation and silicone and oxygen reaction process monitoring in SiC material oxidation, respectively monitors the SiC material oxidation process from the two aspects of C and Si, and increases the effective detection accuracy of a SiC composite material oxidative damage monitoring sensor system. The sensing system includes a computer, a spectrometer, a broadband light source, an LPFG silicon carbide material oxidation sensing probe, an optic fiber coupler, a optic fiber connector, an optical switch and an sensing optical fiber. The present invention realizes real-time monitoring of the oxidation state of the SiC matter in SiC composite materials.
Description
technical field [0001] The invention relates to a sensing system and a monitoring method for monitoring the oxidation state of SiC substances based on the sensing characteristics of LPFG. Background technique [0002] C / SiC composite material is a composite material with excellent performance prepared by using carbon fiber as a reinforcing material, SiC as a matrix material, and various advanced processing and forming methods. It solves the technical difficulties that cannot be solved by a single material. It is currently the most popular One of the most important high-performance materials, it has the advantages of low density, high specific strength, high specific modulus, good designability, and easy molding. It is widely used in many fields such as aerospace, shipbuilding, wind power, construction, and chemical industry. However, during the manufacturing and long-term service of such materials, structural damage in the form of internal breakpoints, cracks, and delaminati...
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IPC IPC(8): G01N21/25
Inventor 刘宏月于瀛洁
Owner SHANGHAI UNIV