Acoustic range finding system

Details Acoustic range finding system Acoustic range finding system

1988-05-05

1989-12-26

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 98, 367901, 367908, 73290V, 340627, 364561, G01S 1508

Patent

active

048902667

ABSTRACT:
In acoustic level sensing apparatus, in which pulses of acoustic energy are transmitted by an electrically energized transducer towards a surface to be sensed, and the electrical output from the transducer following the pulse is digitized and analyzed to detect a return echo from the surface, so as to produce a digitized echo profile. The digitized echo profile is enhanced by removing narrow peaks likely to correspond with certain types of spurious echo, and narrow valleys which may represent fragmentation of a wanted echo. Echoes are identified by comparing the profile with a time varying threshold generated derived from a linear regression performed on part of the threshold, various different types of comparison being performed and their results combined prior to selecting the most likely true echo on the basis of the combined results.

REFERENCES:
patent: 3380018 (1968-04-01), Littrell et al.
patent: 3505637 (1970-04-01), Abruzzo
patent: 3944963 (1976-03-01), Caporin et al.
patent: 4596144 (1986-06-01), Panton et al.
patent: 4700569 (1987-10-01), Michalski et al.

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