Patent ID: 6118132
Filing Date: 2000-09-12
Classification: G01B,G01P

Abstract:
A system for calculating strain of a moving web of material comprising:a first photosensor array disposed near the web of material,a second photosensor array disposed near the web of material and separated from the first photosensor array by a predetermined distance d, the separation distance ""d "" being parallel to a direction of travel of the moving web of of material;a processing unit coupled to both the first photosensor array and the second photosensor array;a first code segment configured to control the processing unit to detect a pattern on the web of material at the first photosensor array;second code segment configured to control the processing unit to recognize the detected pattern on the web of material at the second photosensor array; anda third code segment configured to control the processing unit to calculate the strain on the web of material based on the velocity of the web of material, the distance d, and an elapsed time between the detection of the pattern in response to the first code segment and the recognition of the pattern in response to the second code segment.