Dual transducer connection by a single cable
US4532796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1983 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Nov 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.