| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for measuring the quantity of a dissolved gas in a liquid which quickly knows the quantity of the dissolved gas in the liquid, is easily handled, light to be carried, inexpensive, and eliminates a necessity of a vacuum system in a circuit of the apparatus. SOLUTION: The apparatus comprises an ultrasonic measuring vessel 13 for storing a sample liquid; a trap vessel 14 for trapping the overflowing sample liquid; a pump 15 for pressurizing or depressurizing the trap vessel; an ultrasonic sensor 20 provided in the ultrasonic measuring vessel; an ultrasonic generator 31 for generating ultrasonic waves toward the ultrasonic sensor at a predetermined frequency; a signal processing section 32 for processing signals in reflection waves of the ultrasonic sensor; a calculation section 33 for determining the quantity of the dissolved gas from an attenuation rate of the ultrasonic waves determined from the signal processing section, a display 36 for displaying a calculation result; and a control section 34 for controlling the apparatus. COPYRIGHT: (C)2006,JPO&NCIPI
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