Measuring and testing – Vibration – By mechanical waves
Patent
1985-09-20
1987-05-19
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73597, G01N 2900
Patent
active
046657517
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).
REFERENCES:
patent: 3748895 (1973-07-01), Kummer et al.
patent: 4068524 (1978-01-01), Lewis et al.
patent: 4261367 (1981-04-01), Freese
J. Krautkramer, H. Krautkramer; "Werkstoffprufung mit Ultraschall", 4th edition, Spring Verlag, Berlin/Heidelberg/New York pp. 191-195.
Ciarlante Anthony V.
Nukem GmbH
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