Method and apparatus for determining the rate of angular rotation of a rotating object
US5636014A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/806
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining the rate of angular rotation of a rotating object comprising directing a beam of substantially coherent electromagnetic radiation towards the rotating object (80); detecting speckles generated by electromagnetic radiation (60) scattered from the object; and determining the transit time of the detected speckles; wherein the field of electromagnetic radiation (60) scattered from the object is Fourier-transformed by an optical Fourier-transforming system (20); and subjective speckles (71) of the Fourier-transformed electromagnetic radiation (70) are detected in at least two detection regions (12, 13) positioned in a detector plan (9) substantially parallel with and located in or near the Fourier-plane (10) of the Fourier-transforming system (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.