Time-shaped AGC for ultrasonic liquid level meter of the echo-ra

Details Time-shaped AGC for ultrasonic liquid level meter of the echo-ra Time-shaped AGC for ultrasonic liquid level meter of the echo-ra

1984-07-30

1986-04-01

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

73631, 73900, 367108, 367908, G01F 2328, G01S 1508

Patent

active

045789975

ABSTRACT:
An ultrasonic, echo-ranging instrument for measuring the level of liquid in an open channel or tank. The instrument includes a transducer disposed at a fixed position directly above the liquid surface, the nature of the gaseous environment therebetween determining the velocity of ultrasonic energy propagated therethrough. The transducer is excited to emit periodic pulses which are intercepted by the liquid surface and by a reference point a fixed distance from the transducer to produce both reference and liquid echo pulses that are returned to the transducer and detected thereby. The respective transit times of the reference echo and the liquid echo pulses are determined, and the ratio between these transit times is computed to provide an output representing the level of liquid independent of changes in the gaseous environment. To ensure accurate readings, the reference echo and liquid echo pulses from the transducer are fed to a single automatic gain control circuit whose operation is time shared. The circuit is enabled in a reference mode having a predetermined duration to effect gain control for the reference echo pulse and is thereafter enabled in a target mode having a predetermined duration to effect gain control for the liquid echo pulses.

REFERENCES:
patent: 3090224 (1963-05-01), Rankin
patent: 4210969 (1980-07-01), Massa
patent: 4221004 (1980-09-01), Combs et al.
patent: 4398261 (1963-08-01), Saint-Oyant et al.
patent: 4470299 (1985-04-01), Soltz
"Applications of the VCR", with AGC and Differential Amplifier Transfer Characteristics; Jacob Millman-Microelectronics Book, .COPYRGT.1979; pp. 404-406, 533-535.

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