Three-dimensional optical fiber acceleration sensor with strong electromagnetic interference-resistant capability

Abstract

The invention discloses a three-dimensional optical fiber acceleration sensor with strong electromagnetic interference-resistant capability. The sensor comprises a sensor housing, a vibrator structure and a sensor light path. The vibrator structure is composed of three pairs of elastic sensitive elements and a mass block; the elastic sensitive elements are distributed orthogonally in pairs by using the mass block as the center along the three-dimensional axial direction of the mass block; for two corresponding elastic sensitive elements in each one-dimensional direction, one elastic sensitive element is wound with a sensing fiber, one end of the sensing fiber is connected with an external fiber by a first fiber coupler and the other end is connected with a Faraday magnetic mirror by a second fiber coupler, and thus three sensing paths are formed. The sensor housing and the vibrator structure are made of non-metallic materials; the Faraday magnetic mirror is arranged outside the sensor housing beyond a measured strong electromagnetic environment. The sensor provided by the invention is capable of detecting vibration signals in a three-dimensional direction; and a problem of high precision vibration monitoring in high-voltage, heavy-current, high-temperature, and strong-electromagnetism power industrial environments is solved.

Description

technical field [0001] The invention relates to high-precision vibration testing technology in the field of electric power industry, and belongs to the field of acceleration sensors. Specifically, the invention relates to a three-dimensional optical fiber acceleration sensor capable of resisting strong electromagnetic interference. Background technique [0002] The power industry is the most important basic energy industry in the development of the national economy. In recent years, the scale of the power system has been expanding, and the capacity and voltage level of the power grid have been continuously improved. The operation and maintenance of the power system has become particularly important. In the power system, vibration is one of the main signs of equipment failure. Therefore, real-time detection of equipment vibration information is of great significance to the safe operation of the power system. Traditional vibration sensors are mainly electromechanical accelerat...

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Problems solved by technology

This fiber grating cantilever beam structure has the advantages of small size, low cost, and simple fabrication, but the sensor has a narrow operating frequency bandwidth and low sensitivity, which cannot meet the needs of high-precision vibration monitoring in the power industry.

[0006] At present, most fiber optic acceleration sensors can only measure vibration signals in a single direction, but in practical engineerin

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