Method and apparatus for normal shock sensing within the focal region of a laser beam
US5424824A · kind A · utility
9Cited by
14References
2Claims
0Family size
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Key dates
| Filing date | May 12, 1993 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | May 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0645
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system using Lidar/Laser anemometry for measuring the position of the normal shock wave and air velocity in the inlet of a supersonic engine is described, A laser beam is focused over a region in the inlet where the shock is expected to be. Small particles in the inlet air each reflect the light which is Doppler shifted according to the air velocity in that point. The system and method utilizes the relative amplitude of two peaks in the Fourier transform of the optical return signal to determine if the position of the shock is within the focal region of the laser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.