High frequency ultrasound measurement using fiber grating laser hydrophone

Li Yang Shao, Sien Ting Lau, Xinyong Dong, Yong Jun Wang, Shun Yee Liu, Hwa Yaw Tam, Helen Lai Wa Chan, Chao Lu

Research output: Journal article publicationConference articleAcademic researchpeer-review


A fiber laser hydrophone system for measuring tone-burst ultrasonic signals up to 40 MHz is developed. The hydrophone consists of a cladding-etched dual polarization distributed Bragg reflector (DBR) fiber laser. The sensing mechanism is based on the modulation of the fiber laser's birefringence induced by the ultrasonic pressure. The ultrasonic signal waveform is demodulated using an FM-DEM (frequency modulation-demodulation) circuit and measured with a digital oscilloscope. Incorporating the time delay measurement of ultrasonic signal, this fiber laser hydrophone system achieves a spatial resolution of 37.5 μm at 40 MHz.
Original languageEnglish
Article number71343U
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Dec 2008
EventPassive Components and Fiber-based Devices V - Hangzhou, China
Duration: 27 Oct 200830 Oct 2008


  • Fiber grating laser
  • Fiber optical sensor
  • Time-domain ultrasonic signal
  • Ultrasonic hydrophone

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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