Inventors:
Edward C. Jupa - Berwyn IL
Arthur S. Zerfahs - Elk Grove IL
Aaron Aronson - Franklin Park IL
International Classification:
G01K 1500
Abstract:
An oil-filled thermometer tube is heated out and sealed. The tube is mounted with the bulb in a reference bath and sequentially moved through a reference station, a column height measuring station, a marking station and a sorting station. The measuring station includes a photosensitive camera having a columnar light source and a line array of photosensitive devices, which are electronically scanned to measure the column height. A plurality of sequential scans are made as a part of a pattern recognition system to insure a measurement only when an oil column has been scanned. The camera produces a digital output which is converted to an output signal to actuate a marker and a sorter at the respective stations.