Measuring and testing – Vibration – By mechanical waves
Patent
1979-10-31
1982-02-09
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
043144799
ABSTRACT:
A method and an apparatus for transmitting and receiving electromagnetic ultra-sound, especially in non-destructive testing of electrically conductive material, comprising the steps of generating one or more magnetic fields by means of one or more electromagnets (1,2,3,4) and supplying a transmitter coil (8) in said magnetic field with a supersonic frequency, and scanning a receiver coil (56) in said magnetic field. In known apparatuses, especially in the testing of non-magnetic material, the signal
oise ratio of a received signal is unfavorable.
According to the present invention said ratio is improved in that said magnetic field is generated during a short time compared with the time between two successively occurring magnetic fields, and that a number of pulses of well-defined length of supersonic frequency are supplied to the transmitter coil (8) when the magnetic field or fields have a sufficient strength.
The receiver coil (56) is scanned after each such pulse, and the different receiver signals are summed up in an integrator (60). The said pulses each have a preferred length of a complete sinusoidally-shaped cycle, whereafter the respective pulse is extinguished entirely.
REFERENCES:
patent: 4164873 (1979-08-01), Bottcher et al.
Ciarlante Anthony V.
Studsvik Energiteknik AB
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