Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-02-01
1994-02-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022721, 356 5, G01D 526, G01S 1700
Patent
active
052889955
ABSTRACT:
Precision displacement and load measurements dependent upon the intensity or attenuation of a signal, as by use of Moire fringe gratings or photoelastic load cells, are made using speed-of-light ranging techniques based on heterodyne frequency conversion with multiple phase-locking. Coiled optical fibres introduce phase delays in radio-frequency-modulated laser rays which are then compounded in phase by selective signal attenuation and merger. The phase is then measured by high precision circuits involving ceramic filters and translated into position or load data. Machine tool control and strain gauge applications are described. The ceramic filter circuit generates a signal measuring rate of change of displacement as a by-product, thereby facilitating measurements involving rapid motion.
REFERENCES:
patent: 4146328 (1979-03-01), Hullein et al.
patent: 4229102 (1980-10-01), Wiklund et al.
patent: 4639129 (1987-01-01), Hullein et al.
patent: 4768877 (1988-09-01), Torregrosa et al.
patent: 4829172 (1989-05-01), Miller
patent: 5044744 (1991-09-01), Ogawa et al.
patent: 5162862 (1992-11-01), Bartram et al.
Lee John R.
Nelms David C.
Optical Metrology Limited
LandOfFree
Electrical measurement apparatus using heterodyne phase conversi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical measurement apparatus using heterodyne phase conversi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical measurement apparatus using heterodyne phase conversi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-173514