Ultra-low temperature optical fiber tip timing sensor

Abstract

The invention discloses an ultra-low temperature optical fiber tip timing sensor, which comprises a sensor probe internally provided with a transmitting optical fiber and a receiving optical fiber. The sensor probe is sequentially connected with a sensor probe low temperature section, a first-section tensile and compression-resisting optical protection cable and a bifurcation conversion adapter; the bifurcation conversion adapter is connected with a second-section tensile and compression-resisting optical protection cable and a third-section tensile and compression-resisting optical protectioncable; the second-section tensile and compression-resisting optical protection cable is connected with a transmitting coupler; the third-section tensile and compression-resisting optical protection cable is connected with a receiving coupler; the transmitting optical fiber sequentially passes through the sensor probe low temperature section, the first-section tensile and compression-resisting optical protection cable, the bifurcation conversion adapter and the second-section tensile and compression-resisting optical protection cable to be connected with the transmitting coupler; and the receiving optical fiber sequentially passes through the sensor probe low temperature section, the first-section tensile and compression-resisting optical protection cable, the bifurcation conversion adapter and the third-section tensile and compression-resisting optical protection cable to be connected with the receiving coupler. The ultra-low temperature optical fiber tip timing sensor can work in a cryogenic condition.

Description

technical field [0001] The invention relates to the field of non-contact vibration measurement of rotating blades, in particular to an ultra-low temperature optical fiber blade tip timing sensor. Background technique [0002] Non-contact blade vibration measurement of large rotating machinery such as aero-engines, steam turbines, compressors, and gas turbines is increasingly used. The basic measurement principle is blade tip timing vibration measurement technology. Among them, the fiber-optic blade tip timing sensor has the advantages of fast response, high precision, and anti-electromagnetic compatibility, and has become the first choice for non-contact blade vibration sensors. During the working process of the fiber-optic blade tip timing sensor, the vibration measurement system transmits optical signals to the transmitter end of the sensor, the blade sweeps the sensor probe, and the receiving optical fibers (generally more than 6, forming a receiving optical fiber bundle)...

AI Technical Summary

Problems solved by technology

At present, the fiber-optic blade tip timing sensor can only work at room temperature or around -60°C, but it cannot work normally in a cryogenic environment. For example, the compressor blades in a large low-temperature wind tunnel are in a working environment of about -160°C

Ordinary sensors cannot meet the requirements, and it is not yet possible to realize non-contact blade vibration monitoring in cryogenic environments

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