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Flying-spot-scanner-system

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Flying spot scanner system

Details

Inventors: Jette, Paul;
Assignee: Q-Val Incorporated (Fairfield, CT)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A flying spot scanner system uses a beam splitting mirror to produce adjacent flying spot images on a material to be analyzed, typically a moving web. The images from the flying spots are split by this beam mirror and sensed by separate photodetectors. The outputs from the photodetectors are algebraically combined on a real time basis, the resultant output signal indicative of web conditions, such as web edges, dirt spots, streaks, scratches and holes. The algebraic output signal amplitude is immune from rapid changes in the web illumination such as caused by changes in external ambient light levels. This signal is also highly immune to variations in the illumination level of the web along the path of the flying spots. The algebraic output signal, by not utilizing differentiation of the received information, has an amplitude independent of the flying spot speeds. The shape of the flying spots can be varied to enhance detection of particular types of defects.

DETAILED DESCRIPTION Having described the invention, what is claimed is: 1.
A flying spot scanner system for use with a web moving along a path, comprising: (A) means for repetitively scanning the moving web; (B) means for establishing at least two adjacent flying spots on the moving web the flying spots periodically traversing the web by the scanning means; (C) means for separately sensing the amount of radiation received from each flying spot, with each of the sensing means generating a separate signal; (D) means for algebraically combining the signals produced by each sensing means; and (E) means for comparing the algebraically combined signal with at least one threshold value indicative of a particular type of defect, so as to produce an output signal if the algebraically combined signal is greater than the threshold value; whereby the special algebraic difference in the radiation received from the adjacent flying spots is indicative of the presence or absence of a particular defect type by comparison to a threshold value, 2.
A flying spot scanner system as defined in claim 1 wherein the means for establishing adjacent flying spot images comprises a primary focusing lens in combination with a split beam mirror, the split beam mirror having at least two adjacent mirrored surfaces, each mirrored surface having a shape proportional to the shape of one of the flying spot shapes.
3.
A flying spot scanner system as defined in claim 1 or 2 wherein the algebraic combining means electronically combines two flying spot sensing signals in the following manner, (A-B)/(A+B); where A and B each represent the magnitude of one of the sensing signals.
4.
A flying spot scanner system as defined in claim 3 further wherein the algebraic combining means limits the minimum value of the numerator, (A+B), to a predetermined value.
5.
A flying spot scanner system as defined in claim: 4 further comprising means for generating a scan signal representing the start of each scan by the web scanning means, and also comprising means responsive to the can signal for normalizing the value of one sensing signal to another sensing signal during part of each scan

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