Measuring and testing – Vibration – By mechanical waves
Patent
1981-04-07
1983-12-20
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73602, 328165, G01N 2904
Patent
active
044209789
ABSTRACT:
A method at the transmission and reception of electromagnetically generated and received pulses of ultrasound, especially at non-destructive testing of electrically conductive material.
The method comprises the steps of in a transmitter generating a first magnetic field by means of a first coil and a magnet core and supplying a transmitter coil located in the first magnetic field with a transmission pulse of ultrasonic frequency, and in a receiver generating a second magnetic field by means of a second coil and magnet core and by means of a receiver coil located in the second magnetic field receiving a signal originating from said transmitted pulse. When testing in this way nonmagnetic material, the signal
oise ratio is low. The noise partially originates from generated ultrasound affecting the transmitter and receiver magnets.
According to the invention, a first transmission pulse is caused to be transmitted and received while the current in said first coil (1) and said second coil (2) has the same or different direction, whereafter the received signal is stored in a memory (8) intended therefor, whereafter a second transmission pulse is caused to be transmitted and received while the current in said first coil (1) or said second coil (2) has reversed direction compared with the condition when the first transmission pulse was transmitted and received, whereafter the difference between the signal last received and said stored signal is formed.
By the present invention, after said difference has been formed a signal substantially free of interference is received.
The invention further comprises a device for carrying out said method.
REFERENCES:
patent: 3638175 (1972-01-01), Stone
patent: 3786409 (1974-01-01), Sorkin
patent: 4093923 (1978-06-01), McCormick
patent: 4314479 (1982-02-01), Spijkerman
Ohlsson Willy
Robinson Thomas
Birmiel Howard A.
Studsvik Energiteknik AB
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