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System and method for measuring a size of a distant object

  • US 7,738,082 B1
  • Filed: 10/22/2007
  • Issued: 06/15/2010
  • Est. Priority Date: 10/20/2006
  • Status: Active Grant
First Claim
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1. A system for measuring a size of a feature of a distant object, comprising:

  • a rangefinder operable to determine a range to the distant object and to generate an output signal indicative of the range;

    an aiming mark to facilitate aiming the rangefinder at the distant object;

    an optical sighting device including a visual display displayed in a field of view of the optical sighting device, the visual display comprising;

    a variable scale having a gauge for measuring the feature of the distant object and an indicia associated with the gauge; and

    the variable scale responsive to the output signal of the rangefinder to alter the gauge or the indicia, or both, so that the indicia represents a linear dimension at the determined range that is subtended by the gauge, whereby the size of the feature is estimable by a visual comparison between the gauge and the feature, with reference to the indicia.

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