PURPOSE: To obtain a thickness gage of pocket type which can display the thickness of a specimen in terms of figures and bottom shape by providing a position signal generating part in an ultrasonic probe part and providing a flat platelike display board in a digital thickness display part.
CONSTITUTION: The ultrasonic waves 4 emitted in a specimen 3 by a pulser 1 and a probe 2 are reflected by a bottom surface 5, and said waves received by a probe and are inputted via a waveform forming circuit 7 via an FF circuit 9 which is applied with the signal of the pulser 1 with delay 8. After the waves are integrated 11, they are subjected to A-D conversion 12, and the thickness is displayed on a digital display device 14. The thickness signal after A-D conversion 16 is inputted to analog switches 17. The ultrasonic waves from a microphone 18 are picked up with a microphone 20, and the time difference between both microphone signals is detected 22 and is made into a position signal for the probe. The switches 17 are selected sequentially by said signal, whereby the thickness signal is stored as the bottom shape of the specimen in each position of the probe in a max. value holding circuit 23 consisting of shift registers and said shape is displayed in a two-dimensional display circuit 24.
HANMURA HISAO
SAKAIGAWA HIROMASA
HITACHI ENG CO LTD
| JPS5550109A | 1980-04-11 | |||
| JPS51134175A | 1976-11-20 | |||
| JPS5166855A | 1976-06-09 |