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.