| 摘要 |
The present invention is an ultrasonic sensor comprising a ring-shaped ultrasonic vibrator that is disposed on an outer circumferential surface of a conduit tube in which a minute flow quantity substance flows and that is vibrated by application of high frequency signals and generates high frequency signals by receiving the vibration and a pair of damping members that are arranged so as to grasp and fix the ultrasonic vibrator, wherein an annular soft uniform matching member having a width along said conduit tube larger than that of said ultrasonic vibrator is provided between an inner circumferential surface of said ultrasonic vibrator and said outer circumferential surface of said conduit tube, and said matching member is made of a material having a sound propagation velocity substantially equal to a sound propagation velocity of the substance flowing in the conduit tube, and an ultrasonic flowmeter using it. |
