Ultrasonic distance measuring instrument

Details Ultrasonic distance measuring instrument Ultrasonic distance measuring instrument

1990-01-18

1992-11-17

Williams, Hezron E.

Measuring and testing

Liquid level or depth gauge

73597, 364560, 364561, G01F 2328, G01S 1502

Patent

active

051633230

ABSTRACT:
A non-contact type ultrasonic distance measuring device that includes a micro processor for controlling operation of a transducer that functions as both a sonic transmitter and receiver. Micro processor programming provides a control scheme whereby an operator can program different modes of operation into the instrument by depressing buttons arranged on a rear display panel of the instrument. Mode programming is accomplished in a manner similar to setting a digital watch, with the modes displayed in a display window. The mode programming and component operation provide a gate scheme where gate control is provided through application of gain control through three (3) amplifiers, one of which is a fourth order bandpass filter that is operated by the micro processor to provide a controlled increase in gain or "Q" as the elapsed time from a transmission becomes greater. The program self-adjusts during operation to sense the distances to close targets and to targets as far away as seventy (70) feet and can provide an accurate identification of a target through clutter as may exist in some instrument applications. Pulsing control is also provided for in the mode programming, whereby, after a single pulse is sent, the instrument will not send a next pulse until the expiration of a set time period.

REFERENCES:
patent: 3237451 (1966-03-01), Haeff
patent: 4000650 (1977-01-01), Snyder
patent: 4221004 (1980-09-01), Combs et al.
patent: 4572253 (1986-02-01), Farmer et al.
patent: 4665924 (1987-05-01), Saito et al.
patent: 4733355 (1988-03-01), Davidson et al.

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