Method for measuring the wall thicknesses of bodies by means of ultrasonic pulses and devices for applying the method
US4665751A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1985 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Sep 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B17/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and a device for measuring the wall thickness of bodies by means of ultrasonic pulses. The ultrasonic pulses are created in the bodies and reflected on the walls. The transit times of the ultrasonic pulses reflected on the walls are measured. The wall thickness is determined from the transit times by considering the respective sonic speed in the body. The measured signals obtained with a receiver are each compared with a threshold value that is set to a low base value (17a) at the beginning of the measurement. With each measured signal exceeding the associated threshold value (17a, 17b, 17c, 17d respectively) the threshold value is reset to the amplitude of the measured signal. The times from a specified starting time are measured up to the measured pulses that exceed the threshold values. The maximum value of the time corresponds to the transit time of the back wall echo (13).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.