Tip-sensitive fibre-optic Bragg grating ultrasonic hydrophone for measuring high-intensity focused ultrasound fields

• Published in: Electronics letters Vol. 50; no. 9; pp. 649 - 650
• Main Authors: Wang, D.H, Jia, Ping Gang, Ma, Z.G, Xie, L.F, Liang, Q.B
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 24.04.2014; Institution of Engineering and Technology; John Wiley & Sons, Inc
• Subjects: acoustic intensity; Acoustic measurement; acoustic pressure sensitivity; Acoustical engineering; Acoustical measurements and instrumentation; Acoustics; Biological and medical sciences; Bragg grating ultrasonic hydrophone; Bragg gratings; Equivalence; Exact sciences and technology; Fiber optics; fibre optic sensors; fibre optic ultrasonic hydrophone; Fundamental areas of phenomenology (including applications); HIFU fields; high intensity focused ultrasound field measurement; Hydrophones; Medical sciences; Optical fibers; Physics; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); spatial resolution; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Technology. Biomaterials. Equipments. Material. Instrumentation; tip sensitive ultrasonic hydrophone; TSFBGUH instrument; ultrasonic measurement; Ultrasonics, quantum acoustics, and physical effects of sound; Ultrasound; HIFU fields; acoustic intensity; TSFBGUH instrument; tip sensitive ultrasonic hydrophone; fibre optic ultrasonic hydrophone; Bragg gratings; Bragg grating ultrasonic hydrophone; acoustic pressure sensitivity; fibre optic sensors; hydrophones; spatial resolution; ultrasonic measurement; high intensity focused ultrasound field measurement; Measurement; High resolution; Interaction; Ultrasonic treatment; Bragg grating; Acoustics; Acoustic beam; Experimental study; Fiber optic sensors; Ultrasonic control; Focusing; Power device; Spatial resolution; Ultrasonic transducer; Ultrasound; Induced hyperthermia; Optical fiber; Hydrophone
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2013.3961

A tip-sensitive fibre-optic Bragg grating ultrasonic hydrophone (TSFBGUH) with high spatial resolution for measuring high-intensity focused ultrasound (HIFU) fields is reported. When measuring a HIFU field, the sensitive axis of the TSFBGUH with a flexible fibre-optic sensor holder should be in parallel with the acoustic axis of the HIFU transducer to ensure the measured ultrasound impinges on the tip of the TSFBGUH. The TSFBGUH system has been established and tested. The experimental results show that the acoustic pressure sensitivity of the TSFBGUH system is about 31.3 mV/MPa within the measurement range of 10 MHz and the noise equivalent pressure is about 10.4 kPa.