Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-06-19
1980-01-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
144312, G01N 2130
Patent
active
041863100
ABSTRACT:
Plural scanners are employed for detecting the surface features of a wood cant preparatory to sawing the cant into one or more boards. A scanner includes a radiation detector disposed above the cant on the wane side thereof, and a radiation source below the cant whereby the edges of the cant may be detected. A further pair of radiation sources are also located above the cant on the wane side thereof in angular relation to the detector for producing radiation beams which intersect the detection path of the detector only at a surface level corresponding to a predetermined acceptable wood thickness, as distinguished from the forward and rearward wanes. The wanes are detected as the region between detector illumination by the source below the cant, and detector illumination from the pair of sources above the cant.
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