Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1990-08-16
1992-09-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
180167, G05B 100
Patent
active
051441306
ABSTRACT:
There is disclosed a method for the adjustment of an optical row of sensors which, for guiding a driverless vehicle along an optical guideway, is secured at the vehicle transversly with respect to the vehicle travel direction. Known systems attempt to accomplish a compensation of component tolerances by carrying out an adjustment between the measurement signals of the sensors. However, this leads to inaccurate measurement values. A post-adjustment of a contrast value is not contemplated with these systems. The invention eliminates these inaccuracies and affords an exact post-adjustment. On the one hand, this is attained in that the sensors are adjusted by a calibration surface and the adjustment values for controlling the sensors are stored in an adjustment table. On the other hand, it is proposed to perform the adjustment operation at the site of use of the equipment and to provide an adaptive post-adjustment of the thus set adjustment table.
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IBM Technical Disclosure Bulletin, vol. 29, No. 9, page 4189, Feb. 1987, entitled "Self-Adjusting Analog Toner Patch Sensor".
"Ground Reflectance Measurement Techniques: A Comparison", authored by M. Duggin et al. Applied Optics, vol. 22, No. 23, Dec. 1, 1983, New York, NY pp. 3771-3777.
"Fahrerlose Flurforderzeuge -Hilfen auf dem Wege zur Automatisierung" (translated as Driverless Floor Transport Vehicles-Resources on the Way to Automation) by P. Gunsser in Textil Praxis International 1984, vol. 7, pp. 661-664.
"Neue Systeme zur Steuerung von Flurforderzeugen" (translated as New Systems for Controlling Floor Vehicles) by Hartmut Jorichs in Technische Rundschau, vol. 1/89, pp. 34 through 39, 1989.
Haeusler Dominik
Meyer Urs
Oberhaensli Rene F.
Nelms David C.
Rieter Machine Works Limited
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