Frequency shifter and optical displacement measuring apparatus using the same
US5737116A · kind A · utility
17Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4812
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A frequency shifter is capable of controlling the adverse influences of electric noise caused by the voltage applied to electrooptical elements of a frequency shifter. The frequency shifter modulates the phase of the luminous flux entering the electrooptical elements by applying a voltage to the electrooptical elements; the shifter is provided with a shield for electrically shielding the circuit for generating the voltage to be applied to the electrooptical elements and the electrooptical elements from an external circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.