Method of testing the integrity of an ultrasonic system for sens

Details Method of testing the integrity of an ultrasonic system for sens Method of testing the integrity of an ultrasonic system for sens

1980-06-10

1981-11-10

Yasich, Daniel M.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 1DV, 73290V, 324 80, G01F 2500, G01N 2900

Patent

active

042991145

ABSTRACT:
An ultrasonic system for sensing a liquid-fluid interface comprises a support structure (10) to which a transmitting crystal (21) and a receiving crystal (22) are bonded in such a way that the crystals (21 and 22) are positioned opposite each other across a gap (30). Each of the crystals (21 and 22) has a relatively high resonant frequency and a relatively low resonant frequency. An amplifier means (40) and a bandpass filter means (50) are connected to the crystals (21 and 22) to form a feedback loop. In normal operation, the transmitting crystal (21) is excited to resonate at its high resonant frequency in order to cause transmission of an ultrasonic signal across the gap (30) without causing appreciable ultrasonic transmission through the support structure (10) to the receiving crystal (22). When it is desired to test the system for integrity in the absence of liquid in the gap (30), the transmitting crystal (21) is excited to resonate at its low resonant frequency and the passband of the bandpass filter means (50) is shifted to enable low frequency oscillations to occur in the feedback loop due to ultrasonic transmission (i.e., cross-talk) through the support structure (10) between the crystals (21 and 22).

REFERENCES:
patent: 3213438 (1965-10-01), Felice et al.
patent: 3520186 (1970-07-01), Adams et al.
patent: 3851333 (1974-11-01), Fishman
patent: 4118983 (1978-10-01), Brazhnikov
patent: 4182155 (1980-01-01), Fowler

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