Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1992-05-22
1994-09-27
Warden, Robert J.
Optics: measuring and testing
By particle light scattering
With photocell detection
356 285, G01P 338, G01B 902
Patent
active
053511220
ABSTRACT:
An absolute gravity inline measuring apparatus includes an interferometer arrangement, a test mass tracking system, and a superspring mechanism. The interferometer arrangement includes first and second beam splitters for respective splitting and recombining a laser light beam and upper and lower cornercube retroreflectors facing toward one another and spaced above and below the first beam splitter so as to reflect one split portion of the laser beam in vertically-aligned upper gravity measuring and lower motion compensating portions of a variable leg of the interferometer light beam path. The test mass tracking system includes a cart vertically movably in an evacuated elongated housing and releasably supporting a test mass in a drag-free enclosure. The test mass incorporates the upper retroreflector of the variable leg of the interferometer light beam path. A cart controller is used for selecting operation of the cart in either one of a test mass drop mode or a test mass throw mode for making absolute gravity measurements. The superspring mechanism includes an inertial mass which incorporates the lower retroreflector of the variable leg of the interferometer light beam path, coarse and fine motion compensating mechanisms incorporating main and auxiliary springs operable to maintain the inertial mass in a motionless state, and a temperature-responsive lever mechanism to compensate for temperature-induced changes in the length of the main spring.
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Faller James E.
Hollander William J.
Niebauer Timothy M.
Dawson E. Leigh
Flanagan John R.
Micro-g Solutions, Inc.
Warden Robert J.
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