A damping-adjustable all-fiber-optic acceleration microseismic monitoring sensor probe

Abstract

The invention relates to a damping adjustable all-fiber acceleration microseism monitoring sensor probe, and belongs to the technical field of fiber sensing and microseism monitoring. The sensor probe comprises a sensing probe housing, a reference arm elastomer, a sensing arm elastomer, a mass block pedestal, an adjusting nut, a damping ring and a sensing probe top cover; incident, reflecting, reference-arm and sensing-arm fibers connected with a fiber coupler, a reference arm reflector and a sensing arm reflector form a complete sensing optical path; and a laser source is transmitted to a sensing probe, pilot light and reference light with seismic information in the sensing probe are interfered in the fiber coupler, the interfered light is transmitted to a signal demodulator via the reflecting fiber, and a microseism signal to be measured is recovered. High sensitivity of the sensor is intruded, a damping adjustable technology is introduced, the sensitivity of the sensor in the resonant frequency is reduced, a frequency response curve is smoother, the detection bandwidth is broadened, the amplitude-frequency and phase-frequency characteristics are improved, and the microseism signal can be obtained without loss.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and microseismic monitoring, in particular to a damping-adjustable all-fiber-optic acceleration microseismic monitoring sensor probe. Background technique [0002] With the continuous development of optoelectronic technology and optical fiber technology, the optical fiber communication technology with optical fiber as the transmission element and the optical fiber sensing technology with optical fiber as the sensitive element have developed rapidly. Fiber optic sensors used to measure physical quantities such as acceleration, displacement, and stress are increasingly emerging. Compared with traditional piezoelectric and ultrasonic sensors, fiber optic sensors have significant advantages: light weight, small size; large dynamic range, wide operating frequency band; passive , Anti-electromagnetic interference, can be used in harsh environments such as high temperature and high pressure...

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Problems solved by technology

However, there are complex structures, and magnetic objects such as hysteresis coils are not suitable for high electromagnetic environments in coal mines.

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