System for analyzing time-dependent phenomena
US4138727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Oct 31, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/453
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for analyzing a time-varying phenomenon in which the latter is repetitively initiated to provide a train of repetitive output signals. A fast Fourier transform interferometer is provied to scan the train. Data corresponding to a selected temporal resolution element having the same selected time position following initiation of each signal are sampled and the samples coded to improve signal-to-noise ratio. The time relation between a selected retardation point in the interferometer and the initiation of each signal in a given train is successively shifted so as to produce a series of coded data, each datum corresponding to a resolution element occurring at the selected time position but at a different interferometer retardation. The selected data are then assembled in their time sequence to generate a synthetic interferogram. The synthetic interferogram, when inversely transformed, provides the spectrum of the phenomenon as it occurred during the temporal resolution element at the selected time position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.