Non-destructive testing method and apparatus utilizing phase multiplication holography
US4476434A · kind A · utility
10Cited by
17References
8Claims
0Family size
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Key dates
| Filing date | Jan 25, 1982 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Jan 25, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/069
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for imaging of structural characteristics in test objects using radiation amenable to coherent signal processing methods. Frequency and phase multiplication of received flaw signals is used to simulate a test wavelength at least one to two orders of magnitude smaller than the actual wavelength. The apparent reduction in wavelength between the illumination and recording radiation performs a frequency translation hologram. The hologram constructed with a high synthetic frequency and flaw phase multiplication is similar to a conventional acoustic hologram construction at the high frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.