| US 7,339,678 B2 | ||
| Method and system of using odd harmonics for phase generated carrier homodyne | ||
| David B. Hall, La Crescenta, Calif. (US); and Paul L. Greene, La Crescenta, Calif. (US) | ||
| Assigned to Northrop Grumman Corporation, Los Angeles, Calif. (US) | ||
| Filed on Nov. 09, 2005, as Appl. No. 11/270,058. | ||
| Prior Publication US 2007/0103692 A1, May 10, 2007 | ||
| Int. Cl. G01B 9/02 (2006.01); G01B 9/10 (2006.01) | ||
| U.S. Cl. 356—478 [250/227.27] | 21 Claims |
| 1. A method for fast interrogation of a signal-of-interest, comprising the steps of:
applying to a signal-of-interest a phase generated carrier modulated optical signal at a modulation frequency that is an odd
harmonic of a predetermined frequency;
passing the signal-of-interest through an interferometric system; and
demodulating the signal-of-interest using a demodulation algorithm that is independent of a phase offset.
|