G - Physics – 01 – N
Patent
G - Physics
01
N
349/37
G01N 29/02 (2006.01) G01F 23/296 (2006.01) G01F 25/00 (2006.01)
Patent
CA 1168344
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 cyrstals (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). Case 997
379438
Adams George L.
Silvermetz David
Envirotech Corporation
Macrae & Co.
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