Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1992-10-16
1994-07-05
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
053272153
ABSTRACT:
A sensor which makes use of a non-reciprocal optical effect, such as the Sagnac effect has a passive ring resonator defining a closed light path. Light from a broadband light source is coupled to the passive ring resonator by 2.times.2 couplers in a first direction of propagation and a second direction of propagation opposite thereto. The 2.times.2 couplers also couple light out of the passive ring resonator. A 3.times.3 optical coupler is provided, by which light having circulated in said ring resonator in the first direction of propagation is superimposed to light having circulated in the ring resonator in the second direction of propagation to provide interference. The detector is exposed to this interfering light.
REFERENCES:
patent: 4653917 (1987-03-01), Moeller et al.
patent: 4661964 (1987-04-01), Haavisto
patent: 5004342 (1991-04-01), Bernard et al.
patent: 5237387 (1993-08-01), Sanders
"Optische Kreiselsensoren", by Von W. Holzapfel, VDI-Berichte Nr. 509, 1984, pp. 119-124.
"Closed-Loop Low-Noise Fiber-Optic Rotation Sensor" by J. L. Davis and S. Ezekiel, 1982 Optical Society of America, pp. 186-188.
Bernard Walter
Geister Gotz
Bodenseewerk Geratetechnik GmbH
Turner Samuel A.
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