AUTOMATIC SOUND-SPEED CORRECTING TYPE SUPERSONIC DIMENSION MEASURING GATE

摘要

PURPOSE:To accomplish temperature correction of a measured distance to a specimen by multiplying a ratio of actual distance from a stylus and a wire and a measuring distance by a supersonic wave by a measured distance from the stylus to the specimen by the supersonic wave. CONSTITUTION:A supersonic wave stylus 10 is arranged corresponding to each measuring point of a specimen, such as a channel box 1, mounting a temperature correcting wire 11 between each stylus and measuring surface and the whole assembly is immersed in the water 12. The water temperature has generally been changed to t' deg.C, a different temperature from the initial temperature condition t deg.C an apparent distance of the wire 11 measured by the No.1 pulse meter 15 assumes a distance of L'W and the corresponding voltage VW is obtained by the No.1 distance voltage generator 16. A reflected wave from the channel box 1 is measured for the distance LS' by the No.2 pulse meter 17 and the corresponding voltage VS is obtained by the No.2 distance voltage generator 18. An arithmetic operation of a correcting coefficient VW/VW' is made from the initial voltage VW stored in a memory 14 through a correcting coefficient calculator 19. A product of the distance voltage VS' and correcting coefficient VW/VW' is obtained for the correction thereof.