| 摘要 |
PURPOSE:To always execute an exact thickness measurement by inhibitting a level of a reflected echo by a rectifier provided in front of a probe. CONSTITUTION:A prove 2 and a rectifier 3 are provided in a probe capsule 1. A prescribed R is formed on the rear end face of this rectifier 3, by which an ultrasonic wave is reflected irregularly and attenuated. As a result, a level of a disturbing echo is suppressed to a level which does not cause an erroneous dedision to be regarded as a surface echo S. Accordingly, it can be prevented that a thickness measurement is executed by synchronizing with the disturbing echo, and a gate can be set at a prescribed position of B1-B2 at all times, following the surface echo S, therefore, the thickness measurement can be executed with high reliability. In this way, an exact thickness measurement can be executed at all times. |
