METHOD FOR MANUFACTURING ACOUSTIC MATCHING BODY, ACOUSTIC MATCHING BODY, ULTRASONIC TRANSDUCER USING ACOUSTIC MATCHING BODY, AND ULTRASONIC FLOWMETER

摘要

Provided are an acoustic matching member with a fixed density, an ultrasonic transmitter/receiver unit with a high sensitivity, and an ultrasonic flow meter device which attains stable and high-accurate flow measurement. An acoustic matching member (19) comprises hollow elements and a binding agent. The acoustic matching member (19) is created by removing hollow elements (3) having higher densities, hollow elements (4) having cracks, etc., from hollow elements (2) before sorting-out. Since the hollow elements (3) having higher densities, the hollow elements (4) having cracks, etc., are removed from hollow elements (2) before sorting-out, it becomes possible to provide an acoustic matching member having fixed characteristics without being affected by a manufacturing lot and a transportation process of the hollow elements. An ultrasonic transmitter/receiver unit created using the acoustic matching member has fixed characteristics and is able to perform high-accurate flow measurement.