Research on demodulation technology of air acoustic sensor based on DFB-FL

Xiaomei Ma; Faxiang Zhang; Jinwei Wang; Shujuan Li; Long Ma

doi:10.1117/12.2592168

26 January 2021 Research on demodulation technology of air acoustic sensor based on DFB-FL

Xiaomei Ma, Faxiang Zhang, Jinwei Wang, Shujuan Li, Long Ma

Proceedings Volume 11767, 2020 International Conference on Optoelectronic Materials and Devices; 117670X (2021) https://doi.org/10.1117/12.2592168
Event: 2020 International Conference on Optoelectronic Materials and Devices, 2020, Guangzhou, China

Abstract

In this paper, we demonstrate an improved dynamic demodulation system for acoustic sensors based on distributed feedback-fiber laser (DFB-FL). The signal is demodulated using the phase-generated carrier (PGC) demodulation technology based on unbalanced Michelson interferometer (MI). An improved PGC demodulation algorithm is introduced, which solves the problems of light intensity disturbance (LID) and phase modulation depth drift in the traditional PGC demodulation algorithm that affect the demodulation results. The acoustic pressure sensitivity test of a packaged DFB-FL acoustic sensor is carried out to evaluate the performances of the demodulation system, a flat acoustic pressure sensitivity and frequency response curve was achieved in the frequency range of 200 Hz~18 kHz, the wavelength-acoustic sensitivity was about -40.22 dB re. pm/Pa. The amplitude changes of demodulation signal with light intensity and modulation depth are also tested, and it shows that the stability of the demodulation system has been significantly improved.

Citation Download Citation

Xiaomei Ma, Faxiang Zhang, Jinwei Wang, Shujuan Li, and Long Ma "Research on demodulation technology of air acoustic sensor based on DFB-FL", Proc. SPIE 11767, 2020 International Conference on Optoelectronic Materials and Devices, 117670X (26 January 2021); https://doi.org/10.1117/12.2592168

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available