Fiber Fabry-Perot sound wave probe and signal demodulation system

Abstract

The invention relates to the fields of the fiber technology, the optical engineering, the material engineering and the signal processing technology, and specifically relates to a fiber Fabry-Perot sound wave probe and a signal demodulation system. The probe employs a reduced graphene oxide film as a sound vibration sensitive film, so the probe is easy to transfer, is simple in manufacturing, is low in cost, and is high in yield. The demodulation signal employs a three-wavelength phase demodulation method. A broadband light source, a circulator, the fiber Fabry-Perot sound wave probe, a wavelength division multiplexer, a three-channel photoelectric detector, a data collection card and a data processing module cooperate with each other for application, thereby enabling the fiber Fabry-Perotsound wave probe not to be affected by temperature in a working process. The system employs the broadband light source which is low in cost, and the system is high in stability. The system cooperateswith the fiber Fabry-Perot sound wave probe, and can be used for the fields of safety monitoring, medical and biomedical engineering.

Description

technical field [0001] The invention relates to the technical fields of optical fiber technology, optical engineering, material engineering and signal processing, and in particular to an optical fiber FAP acoustic wave probe and a signal demodulation system thereof. Background technique [0002] As a very important optical structure, the optical fiber Fab cavity is widely used in precision instruments, industrial production, communication, sensing and other fields due to its small size, low cost, anti-electromagnetic interference, and many advantages of long-distance signal transmission. It is precisely because of these advantages that the research on acoustic wave sensors based on fiber-optic P-cavity has attracted more and more attention. [0003] The traditional fiber-optic F-P acoustic probe is generally composed of an optical fiber and a vibrating diaphragm. The end face of the optical fiber and the vibrating diaphragm form the two reflection surfaces of the F-P cavity,...

AI Technical Summary

Problems solved by technology

First of all, in terms of making thin films, this kind of single-layer or multi-layer graphene usually adopts the method of chemical vapor deposition, which requires expensive equipment and complicated processes, which greatly increases the production cost and difficulty

Secondly, the thickness of single-layer or multi-layer graphene is only a few nanometers to tens of nanometers. In the transfer process of the film, they usually need a layer of polymer film (PMMA) as a substrate, otherwise it is very difficult to transfer to the end face of the sleeve. , it is very easy to break the graphene film when removing the PMMA film at the end, which makes the yield of graphene probes very low

Images