Measuring instrument for concentration of gas

Measuring and testing – Gas analysis – By vibration

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310340, 310344, G01N 2902

Patent

active

046622128

ABSTRACT:
A gas concentration measuring instrument using the dependency of the propagation velocity of ultrasonic wave propagating in gas on the gas concentration incorporates a dampproof ultrasonic sensor with a metal or the like deposited by evaporation on the surface of the sealing material. Therefore, this gas concentration measuring instrument is almost not affected by the change of temperature and humidity and can precisely measure gas concentration continuously for a long period of time under high humidity. The ultrasonic sensor is formed fundamentally by an ultrasonic vibrator, a holder and a sealing material. More preferably, this sensor is embedded in a block and sealed with an elastic sealing material and a film of conductive material and/or a nonconductive material is formed on the surface of the sealing material, the elastic sealing material, the vibrating end surface of the ultrasonic sensor and the end surface of the block.

REFERENCES:
patent: 2513870 (1950-07-01), Hoffman
patent: 2769930 (1956-11-01), Sturm
patent: 2785321 (1957-03-01), Imler
patent: 4117716 (1978-10-01), Simon
patent: 4220040 (1980-09-01), Noguchi et al.
Journal of the Acoustical Society of Japan, vol. 32, No. 7, Jul. 1976, pp. 436-442.
J. Acoust. Soc. Am., vol. 63 (6), Jun. 1978, Chen, et al., pp. 1795-1800.

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