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High-sensitivity compact ultrasonic detector based on a pi-phase-shifted fiber Bragg grating.

Opt. Lett. 36, 1833-1835 (2011)
Open Access Green as soon as Postprint is submitted to ZB.
A highly sensitive compact hydrophone, based on a pi-phase-shifted fiber Bragg grating, has been developed for the measurement of wideband ultrasonic fields. The grating exhibits a sharp resonance, whose centroid wavelength is pressure sensitive. The resonance is monitored by a continuous-wave (CW) laser to measure ultrasound-induced pressure variations within the grating. In contrast to standard fiber sensors, the high finesse of the resonance-which is the reason for the sensor's high sensitivity-is not associated with a long propagation length. Light localization around the phase shift reduces the effective size of the sensor below that of the grating and is scaled inversely with the resonance spectral width. In our system, an effective sensor length of 270 μm, pressure sensitivity of 440 Pa, and effective bandwidth of 10 MHz were achieved. This performance makes our design attractive for medical imaging applications, such as optoacoustic tomography, in which compact, sensitive, and wideband acoustic detectors are required.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Sensors; Lasers
ISSN (print) / ISBN 0146-9592
e-ISSN 1539-4794
Journal Optics Letters
Quellenangaben Volume: 36, Issue: 10, Pages: 1833-1835 Article Number: , Supplement: ,
Publisher Optical Society of America (OSA)
Reviewing status Peer reviewed