Acoustic wave detection device and method based on hollow-core photonic crystal fiber

Abstract

The invention relates to an acoustic wave detection device based on a hollow-core photonic crystal fiber. The acoustic wave detection device comprises the following sequentially connected devices: a laser device, an optical fiber amplifier, a circulator, an optical fiber and an optical fiber acoustic wave sensor, and is provided with a photoelectric detector, a phase-locked amplifier, a laser controller, a data acquisition card and a signal acquisition and processing unit, wherein the laser emitted by the laser device (200) is amplified by the optical fiber amplifier (201) and then enters a port 1# of the circulator (202), signals outputted by a port 2# of the circulator enter the optical fiber (200) for transmission, the optical fiber is connected with the optical fiber acoustic wave sensor, signals outputted from the optical fiber enter the optical fiber acoustic wave sensor (204), the optical fiber acoustic wave sensor reflects part of the signals, the reflected signals are transmitted by the optical fiber and then enter the circulator from the port 2# of the circulator, and the photoelectric detector (205), the phase-locked amplifier (206), the data acquisition card (208) and the signal acquisition and processing unit are sequentially connected at a port 3# of the circulator.

Description

technical field [0001] The invention relates to the field of optical fiber acoustic wave sensors, in particular to an acoustic wave detection device and method based on a hollow-core photonic crystal optical fiber. Background technique [0002] Compared with traditional sensing technologies, fiber optic sensors have the advantages of low transmission loss, compact structure, high temperature resistance, corrosion resistance, anti-electromagnetic interference, and simple preparation process, especially the frequency bandwidth, large information capacity, and low transmission loss can be realized Long-distance and distributed measurements. Optical fiber sensors can not only measure a variety of physical quantities, such as sound field, electric field, pressure, temperature, etc., but also can complete measurement tasks that are difficult to complete with existing measurement technologies. In recent years, researchers have paid great attention to them. Among them, the optical ...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide an acoustic wave detection device and method based on a hollow-core photonic crystal fiber, which is to improve the sensitivity of acoustic signal detection, thereby solving the problem of low sensitivity of existing optical fiber detection. , complex structure and high cost technical issues

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