G - Physics
01
H
G01H 9/00 (2006.01)
Patent
CA 2073959
2073959 9110885 PCTABS00006 An ultrasonic sensor comprising a polarisation maintaining fibre (4) having two orthogonal linear principal axes and a straight sensing portion (5). A laser source (1) directs a beam through a quarter wave plate (2) to provide a circularly polarised beam to the input end (3) of the fibre. The beam emerging from the output end (8) of the fibre (4) is directed to a linear polariser (9) and the intensity of the beam is detected by a photodetector (10). A signal processor (11) thereafter generates a suitable driving signal for a display unit (12) indicative of mode coupling induced in fibre (4) by incident ultrasonic waves.
Chan Helen Lai Wa
Chiang Kin Seng
Commonwealth Scientific And Industrial Research Organisation
Mccarthy Tetrault Llp
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