Differential type optical fiber F-P vibrating sensor with wide frequency response and high sensitivity

Abstract

The invention discloses a differential type optical fiber F-P vibrating sensor with a wide frequency response and high sensitivity. The differential type optical fiber F-P vibrating sensor is mainly composed of a balance weight body (1), a reflector (2), a first V-shaped cantilever beam (4), a second V-shaped cantilever beam (5), a fixed base (6), a packaging box contact position (8), an optical fiber micro lens (9) and a tail fiber (10). Response frequency and sensitivity of the first V-shaped cantilever beam and the second V-shaped cantilever beam compensate each other, the sensor is high in sensitivity, and the frequency response range reaches 50 Hz-10,000 Hz. When external vibration acts on an F-P cavity through the action of the double cantilever beams of the sensor, a reflecting light signal changes along with the reciprocating change of the balance weight body, and therefore an optical light reflected back by the F-P cavity is changed, and external vibration parameters are obtained by measuring the change amount of the signal. The differential type optical fiber F-P vibrating sensor is simple in structure and convenient to use, the optical signal is not interfered with an electromagnetic field, and the sensor can work quite effectively and precisely, and is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the field of on-line monitoring technology, and more specifically relates to the design and manufacture of a differential optical fiber F-P vibration sensor with wide frequency response and high sensitivity characteristics, belonging to the field of sensing technology. Background technique [0002] Vibration is a common physical phenomenon that widely exists in people's lives. In the field of engineering, vibration often has adverse effects on equipment, and even causes damage to equipment. Because the common frequency response range and sensitivity of existing mechanical structure sensors restrict each other, the measurement frequency is low and the frequency response range is very small. Therefore, the vibration sensing measurement method for mechanical equipment has always been concerned by engineers and technicians. focus. At present, vibration sensors have been widely used in geological exploration and energy development...

AI Technical Summary

Problems solved by technology

The above optical fiber sensors can work effectively under electromagnetic field interference, and the measurement accuracy is also high, but this type of optical fiber vibration sensor has a low response frequency, and generally can only effectively measure vibration signals below 2000 Hz

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