| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic measuring device capable of reducing influences caused from self-noises by extending transmission interval even when a zero flow change occurs due to temperature changes.SOLUTION: An ultrasonic measuring device includes: a flow-rate calculating unit 9 that calculates a flow rate of a fluid to be measured based on a propagation time difference in ultrasonic transmission time to calculate an instantaneous flow rate from the flow rate; a temperature measuring unit 10 that measures a temperature of the fluid to be measured; an interval correction unit 11 that calculates the correlation between a flow rate value calculated by the flow-rate calculating means 9 in a state the fluid to be measured does not flow and the temperature measured by the temperature measuring unit 10 to control a repetition unit 7 to extend the intervals of repetition of the ultrasonic transmission between the oscillators when the flow rate value changes periodically as the temperature changes. With this, a precise ultrasonic measuring device capable of automatically correcting even when the flow rate value varies caused from self vibrations or self-noises of an ultrasonic oscillator due to temperatures changes in the ambient and/or the fluid to be measured can be provided. |
