H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/57.1
H04R 1/44 (2006.01)
Patent
CA 2000147
ABSTRACT Disclosed are hydrophone devices for detecting sound or vibrational waves in a fluid medium. Included are improvements in casing design, transducer design, and electronic signal processing, all of which contribute to stronger, and more useable output signals indicative of the actual vibrational waves detected with less detrimental noise and other signal degradation factors. The apparatus of this invention may comprise a carrier plate on which is mounted a transducer for converting vibrations to electric signals, with one side of the carrier plate positioned in contact with a fluid that carries vibrations and with a chamber on the other side that is isolated from the fluid. The chamber is surrounded by condine, low impedance components that form a Farraday cage around the transducer and high impedance lead from the transducer. One side of the Farraday cage is a ground plane of a surface-mount printed circuit board. Components of an electronic circuit for conditioning the signal are mounted on the printed circuit board and include a buffer having an ultra-high impedance input and a very low impedance output. A constant current source in the buffer keeps external spikes and interference on the output from becoming internally- propagated noise in the buffer circuit. A high pass, low cut, second order active filter utilizing a PNP bipolar transistor to feedback into the second order element can also be provided to filter out extraneous noises and unwanted signals. The circuit has a very low noise and low power draw and is powered by a replaceable battery. The receptor preferably can include an elongated boot enclosing a compartment, preferably filled with a vegetable oil fluid coupling medium in contact with the carrier plate, but can also include a silastic compound couple.
Houghtaling Steven W.
Houghtaling Steven W.
Microsonics Inc.
Smart & Biggar
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