Arrayed waveguide grating-based high-frequency ultrasonic sensors

Jing Zhang; Chuanyi Tao; Jingke Li; Xuhai Jiang; Junhua Cheng; Na Li; Liming Mao; Yan Zhao; Jianjun Xiao

doi:10.1117/12.2536424

20 November 2019 Arrayed waveguide grating-based high-frequency ultrasonic sensors

Jing Zhang, Chuanyi Tao, Jingke Li, Xuhai Jiang, Junhua Cheng, Na Li, Liming Mao, Yan Zhao, Jianjun Xiao

Proceedings Volume 11191, Advanced Sensor Systems and Applications IX; 111910L (2019) https://doi.org/10.1117/12.2536424
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

Arrayed waveguide grating (AWG) has been widely used as a multiplexer in FBG demodulation system because of its high stability, low loss and fast read-write ability. They substitute expensive and vibration fragile spectrometers. In this paper, we compare two kinds of AWG demodulation systems experimentally. One is a multi-channel ultrasonic sensor system using fiber ring laser based on erbium-doped fiber amplifier (EDFA) and arrayed waveguide grating (AWG) as the intensity demodulator. And another is a one-way amplified system based on EDFA. When the external dynamic strains are applied on the FBG sensor, the central wavelength of the FBG will move between two adjacent channels of the AWG. Therefore, the modulation of the central wavelength of the FBG is converted to the amplitude modulation of the output of the two adjacent channels. Experimental results show that the multi-channel ultrasonic sensor system of one-way amplified configuration based on EDFA is more stable and can test high-frequency dynamic strain stably. The ultrasonic signal in water is successfully detected through one-way amplifier configuration.

Citation Download Citation

Jing Zhang, Chuanyi Tao, Jingke Li, Xuhai Jiang, Junhua Cheng, Na Li, Liming Mao, Yan Zhao, and Jianjun Xiao "Arrayed waveguide grating-based high-frequency ultrasonic sensors", Proc. SPIE 11191, Advanced Sensor Systems and Applications IX, 111910L (20 November 2019); https://doi.org/10.1117/12.2536424

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