G - Physics – 01 – H
Patent
G - Physics
01
H
349/35
G01H 3/12 (2006.01) G01H 13/00 (2006.01) G01N 29/04 (2006.01)
Patent
CA 1249655
A METHOD AND DEVICE FOR DETECTING A SPECIFIC ACOUSTIC SPECTRAL FEATURE Abstract of the Disclosure A method and device for detecting a narrow acoustic spectral feature in a sample as described. The method uses an electrical frequency modulated (FM) signal that is obtained from a voltage controlled oscillator. The Fourier spectrum of this wave is a main frequency fc with two small sidebands at frequencies fc+fs. This whole triplet is slowly swept in frequency by a slow sawtooth generator. The electrical signal is fed into a flat acoustic transducer; the acoustic wave is then transmitted through an acoustically active medium, i.e. the sample, and detected by another flat acoustic transducer which produces an FM signal with a superposed amplitude modulated (AM) signal if one of the sidebands overlaps an acoustic feature. This electrical signal is then demodulated to give a pure AM signal which can be phase sensitive detected by using a lock-in amplifier. By suitable adjustment of the phase setting of the lock- im amplifier both the "in-phase" and "out-of-phase" signals of the detected acoustic signal can be detected.
495681
Imaino Wayne I.
Tam Andrew C.
International Business Machines Corporation
Kerr Alexander
LandOfFree
Method and device for detecting a specific acoustic spectral... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for detecting a specific acoustic spectral..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for detecting a specific acoustic spectral... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1304432