Dual transducer connection by a single cable

Details Dual transducer connection by a single cable Dual transducer connection by a single cable

1983-11-07

1985-08-06

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73628, G01N 2904

Patent

active

045327963

ABSTRACT:
A system for testing the fabrication of objects utilizes echo-sounding techniques. A transmit transducer and a receive transducer which provide a conversion between electric and sonic energies are acoustically coupled to the object under test. A single cable connects the transducers to a single processor which generates, receives and analyzes the signals utilized in the test process. A coupling circuit connects one end of the single cable to the two transducers and isolates a transmitted signal from a received signal so as to permit their communication by the single cable. Within the coupling circuit, a transmitted signal is communicated by a set of serially connected diodes wherein the forward voltage drop is much less than the voltage of the transmitted signal, but greater than the voltage of an incoming signal such as a reverberation of the transmitted signal or a received echo signal. The second channel of the coupling circuit provides for a series connection of a resistor with a set of parallel diodes connected with opposed polarity, the diodes being connected across the terminals of the receive transducer.

REFERENCES:
patent: 4437332 (1984-03-01), Pittaro

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