Method and apparatus employing a linear array IR region radiation devices for locating the position of conveyor transported products
US5347135A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Apr 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved edge detection and location system of a variety wherein a linear array of radiation emitting devices are selected to emit in the infrared region of the visible spectrum. The emitter array component is employed in conjunction with a silicon photovoltaic receiver and the combination permits greatly expanded spacing between the emitter component and receiver component of the system. A system highly immune to environmental radiation noise is provided which includes an array of IR region emitters performing in conjunction with the same form of IR emitting devices but configured within a photoreceptor circuit. Enhanced edge detection accuracy is achieved through the utilization of multiple rows of emitting devices arranged in parallel and mutually offset by an amount less than the center-to-center spacing of adjacent such devices. An on-site calibration technique is described for calibrating the systems at their intended location so as to achieve uniformity of radiation intensity at the receiver components under conditions of non-attenuation of that radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.