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Optical Instrument for Local Vertical Determination

IP.com Disclosure Number: IPCOM000096115D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Goetz, WE: AUTHOR [+2]

Abstract

The device is capable of determining when a member carrying the device is positioned vertically above an object exhibiting a generally circular appearance. It is used, for example, to determine the local vertical of a craft approaching the surface of the earth or other celestial body.

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Optical Instrument for Local Vertical Determination

The device is capable of determining when a member carrying the device is positioned vertically above an object exhibiting a generally circular appearance. It is used, for example, to determine the local vertical of a craft approaching the surface of the earth or other celestial body.

Image rays of the object or body 10 are reflected from adjustable mirrors 11 onto each of the three sides of fixed three-sided mirror 12 for common reflection through an objective lens 13 of telescope 14. These rays then pass through reticle 15 and optical eyepiece 16 where they are viewed. Ring gear 17 driven by servomotor 18 carries sloped cam members 19. Members 19 cooperate with cam followers 20 to adjust the angle of mirrors 12 with respect to the optical axis of the telescope.

To establish the local vertical, the telescope is pointed at object 10 and mirrors 11 are adjusted to bring the edges or horizons of the object into the field of view. By simultaneous adjustments of the pointing condition of the telescope and the angular position of mirrors 11, the three horizon images reflected from mirrors 11 are brought into contact with a circle. This is scribed on reticle 15 so that its center is on the optical axis of the device. When the horizons are thus positioned the optical axis of the device defines the local vertical.

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