Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1988-06-16
1990-12-04
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367 99, 367900, G01S 1500
Patent
active
049758896
ABSTRACT:
An acoustic ranging apparatus directs a burst of acoustic energy toward an acoustically reflective target object. The time it takes for an echo to return to the ranging apparatus is measured to determine the distance between the ranging apparatus and the object. The echo is received, amplified, and compared with a threshold voltage which decays in time in a manner which simulates the attenuation of acoustic energy as a function of distance travelled in the medium. The attenuation function is substantially simulated over the distance range that the ranging apparatus is intended to accurately measure by means of a simple, low cost first order linear circuit. The ranging apparatus responds only to echoes having a magnitude which exceeds the threshold voltage. Suprious or false echoes, such as those due to reflection of acoustic energy in the side lobes produced by an acoustic energy transducer in the ranging apparatus, are ignored.
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Orbine, III Stephen A.
Petrucelli Steven P.
Indyk Eugene S.
Pihulic Daniel T.
Tarcza Thomas H.
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