Device for realizing high-sensitivity distributed sound wave sensing based on small-diameter multimode optical fiber
A multi-mode optical fiber and high-sensitivity technology, applied in measuring devices, measuring ultrasonic/acoustic/infrasonic waves, utilizing wave/particle radiation, etc., can solve false positives and false negatives in acoustic signal identification, and the sensitivity of distributed optical fiber vibration sensing systems Insufficient and other problems, to achieve the effect of increasing the amount of light phase change, improving the detection limit of the system, and improving the sensitivity
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[0029] The specific implementation of the present invention will be further described below in conjunction with the embodiments and the drawings. It should be pointed out that if there are any parameters or components that are not specifically noted below, those skilled in the art can use existing conventional technologies to implement them.
[0030] Such as figure 1 , This example is based on the schematic diagram of a device for implementing high-sensitivity distributed acoustic wave sensing based on a thin-diameter multimode fiber. The system uses a high-coherence narrow-linewidth laser as a light source and splits the light into two paths by a coupler, one of which is modulated into an optical pulse by a pulse modulator The sequence is amplified by an optical amplifier and injected into the thin-diameter multimode fiber through a circulator. The backward Rayleigh scattered light in the thin-diameter multimode fiber is transmitted back through the circulator, and the local osci...
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