An environmentally stable optical fiber acoustic wave detection system and method

Abstract

The invention discloses an environment-stable optical fiber acoustic wave detection system and method, belonging to the field of acoustic wave sensors. The invention includes a laser source, an optical circulator, a photoelectric detector, a servo control, a light source controller, a microprocessor, and an optical fiber acoustic sensor. The laser source is a semiconductor laser, which is a distributed feedback laser. When the fiber optic acoustic sensor is subjected to a large temperature change, the measurement signal of the sensor remains in the linear working area to ensure the stability of the signal measurement signal. The intelligent feedback control module ensures that the output signal is in the tuning range of the linear working point of two adjacent valleys. Through the intelligent feedback control module, the laser is unlocked from the linear working position of the rising edge of the current spectral locking pulse and re-locked to the new spectral pulse. The expected point of linear work is to realize the detection of sound source signals in complex environments. The invention can control the time of the unlocking / relocking process within 1ms, and can ensure that the detected sound source signal has no obvious interruption.

Description

technical field [0001] The invention relates to an environment-stable acousto-optic detection system and method, belonging to the field of acoustic wave sensors. Background technique [0002] The development of optical fiber sensing technology is more and more mature, and has been widely used in many fields. Optical fiber acoustic wave sensing technology is an important research field in optical fiber sensing technology. Compared with traditional electrical acoustic wave sensors, it has the advantages of extremely high detection sensitivity, anti-electromagnetic interference, low cost, and can work in harsh environments. big concern. Nowadays, fiber optic acoustic wave sensors have been widely used in industrial production, medical diagnosis, natural disaster early warning, geological exploration, military and other fields. Due to the special environmental requirements for acoustic wave detection in these fields, people began to study and pay attention to fiber optic acous...

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Problems solved by technology

[0003] Aiming at the detection requirements of acoustic signals in complex environments, the technical problem to be solved by an environmentally stable optical fiber acoustic wave detection system and method disclosed in the present invention is: when the optical fiber acoustic sensor is subjected to a large temperature change, the measurement signal of the sensor remains online permanent working area to ensure the stability of signal measurement

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