Gas concentration measurement instrument and gas...

Details Gas concentration measurement instrument and gas... Gas concentration measurement instrument and gas...

2007-04-10

2007-04-10

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C073S024060, C073S031010, C073S602000

Reexamination Certificate

active

10521746

ABSTRACT:
A gas concentration measurement instrument comprises: ultrasonic wave transmitting means for transmitting an ultrasonic wave according to an ultrasonic wave generation signal composed of a group of rectangular pulse waves; ultrasonic wave receiving means for converting the ultrasonic wave transmitted through the gas in the measurement region into an electric signal to use it as an ultrasonic wave reception signal; and gas concentration measuring means for measuring the signal output time when the ultrasonic wave generation signal is outputted, generating an envelope processing signal by subjecting the ultrasonic wave reception signal to an envelope extracting processing, measuring the threshold fall time when the envelope processing signal decreases below a predetermined threshold after exceeding the threshold, and measuring the difference between the threshold fall time and the signal output time as change in the gas concentration.

REFERENCES:
patent: 8-136651 (1994-11-01), None
patent: 2002-5900 (2000-06-01), None
International Search Report dated Oct. 28, 2003.

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