| 摘要 |
PURPOSE:To make the leakage of an ultrasonic wave signal small and to perform highly accurate measurement even though fluid to be measured is a gas, by providing a gap between the side surface of an ultrasonic wave vibrator and the ultrasonic wave transducer-mounting surface of a measuring pipe. CONSTITUTION:An ultrasonic wave vibrator 11 is embedded and bonded in the tip of a packing material 12. The inner diameter of a case 14 is made to be larger than the outer diameter of the packing material 12 by about 1mm.. The base part side of the packing material 12 is bonded to the center of the bottom surface of the case 14. Therefore, a gap 17 is fomed between the side surface of the vibrator 11 and a transducer mounting surface and an element housing 2. Even though lateral vibration occurs in the vibrator 11, the lateral vibration is stopped by the gap 17, and only the small amount of it is propagated to the outside. The ultrasonic wave, which leaks to the housing 2 and a measuring pipe 1, is reduced to almost zero. Even though fluid to be measured is a gas, highly accurate measurement can be performed. |
