Ultrasonic sensor for detecting gas bubbles
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United States of America Patent
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N/A
Issued Date -
Aug 8, 2002
app pub date -
Jan 22, 2002
filing date -
Jan 20, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The ultrasonic sensor comprises an ultrasonic transmitter (11) and an ultrasonic receiver (12) between which an accommodating device (13) for a hose (14) is arranged. The hose is flattened between stamps (21, 22) thus being pressed against rigid concave forming areas (15, 16) where the hose bears in a gap-free manner upon the housing wall (17). The sound velocity in the housing (10) is approximately as large as in the material of the hose (14). In the liquid contained in the hose the sound velocity is considerably smaller. Parallel sound waves are refracted at the interface between hose material and liquid such that the sound waves converge. By concentrating the sound energy into the hose and onto the ultrasonic receiver (12) a high-energy received signal is generated. When air bubbles exist in the liquid, the received signal is attenuated.
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