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Speed independent system for obtaining preselected numbers of samples from object moving along fixed path

  • US 4,441,196 A
  • Filed: 02/28/1980
  • Issued: 04/03/1984
  • Est. Priority Date: 02/28/1980
  • Status: Expired due to Term
First Claim
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1. A method for obtaining a predetermined number of data samples of equal time intervals from an object passing through a sensing zone independent of the speed at which the object passes through the sensing zone by dividing the time in which the object passes through the sensing zone into said predetermined number of equal time intervals regardless of the speed of the object and samping the object during each of the intervals, said method comprising the steps of:

  • (a) establishing a first reference distance upstream of said sensing zone which is a known multiple of the length of said sensing zone;

    (b) measuring the time required for the object to pass through said reference distance;

    (c) dividing the aforementioned time by a divisor comprising the product of said known multiple and the predetermined number whereby to obtain a single time interval;

    (d) consecutively counting off single time intervals during the time said object passes through the sensing zone; and

    ,(e) obtaining a data sample from said object during each of said single intervals whereby to obtain said predetermined number of data samples regardless of the speed of the object.

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