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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
High-sensitivity compact ultrasonic detector based on a pi-phase-shifted fiber Bragg grating.
Opt. Lett. 36, 1833-1835 (2011)
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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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Sensors; Lasers
ISSN (print) / ISBN
0146-9592
e-ISSN
1539-4794
Zeitschrift
Optics Letters
Quellenangaben
Band: 36,
Heft: 10,
Seiten: 1833-1835
Verlag
Optical Society of America (OSA)
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed