Browse Prior Art Database

Remote Sensing Lateral Position Indicator

IP.com Disclosure Number: IPCOM000052702D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Iafrate, PF: AUTHOR [+2]

Abstract

This invention describes a photoelectric circuit that will detect the presence and position of rapidly moving objects within a defined area by means of an optical non-contact method.

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Remote Sensing Lateral Position Indicator

This invention describes a photoelectric circuit that will detect the presence and position of rapidly moving objects within a defined area by means of an optical non-contact method.

In the figure, there is shown three narrow beam light sources 10, 11 and 12, and their corresponding detectors 13, 14 and 15, which are positioned with respect to the light sources so that the three beams emitted from the sources form a Z across a defined area. An object traveling along the X-Y path from X to Y approaches the first light beam between source 10 and detector 13. When the leading edge of the object interrupts the beam, a first electronic count will be started. As the object continues to move along the X-Y path, the diagonal light beam between source 11 and detector 14 is interrupted and a second counter is started while the first counter is stopped. Thus, time T1, indicated in the figure, is measured. As the object continues on the path, it interrupts the last beam between source 12 and detector 15, causing the second counter to be stopped, thus the time T2 is measured. In this way, two time intervals T1 and T2 are measured. Assuming constant velocity through the light beam pattern, the ratio of T1 to T2 yields a true position indication of the object relative to its position between the two side boundaries. The sum of t(1) and t(2) yields the velocity of the object between the light beams.

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