Signal processing technique for ultrasonic inspection
US4307616A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1979 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Dec 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02854
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a correlation receiver for processing an elctrical signal derived from an acoustic signal in a test object, including a signal generator for producing a reference waveform, a multiplier for combining the electrical signal and the reference waveform, an inegrator for integrating the combined signal, and a sample and hold circuit for detecting and holding the output of the integrator. In another embodiment, the signal generator also produces a second reference waveform in quadrature with the first reference waveform, and the receiver further inclues a second multiplier for combining the electrical signal and the second reference waveform, a second integrator for integrating the combined signal, and a means for combining the integrated first and second combined signals to produce an output indicating the structural integrity of the test object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.