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SASH POSITION DETERMINING SYSTEM

  • US 20140273783A1
  • Filed: 03/15/2013
  • Published: 09/18/2014
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A system for determining a sash panel position at a sash opening in a fume hood formed by at least one movable sash panel mounted over a hood opening to an enclosure structure of the fume hood, the system comprising:

  • a light emitting module comprising a linear array of light emitting elements spaced at equal distances from one another, the light emitting module mounted on a fume hood frame with the light emitting elements directed to generate a light path normal to a sash panel direction of motion such that the sash panel blocks the light path when positioned at a corresponding one of the light emitting elements;

    a light sensing module comprising a linear array of light sensing elements spaced at equal distances from one another, the light sensing module mounted on the fume hood frame on a side opposite the sash panel, the light sensing elements being aligned to receive the light path generated by a corresponding light emitting element on the light emitting module when the sash panel is not present between the light emitting element and the light sensing element; and

    a shift register in the light sensing module comprising a plurality of bits corresponding to each of the light sensing elements in the linear array, the shift register configured to store a state of the light sensing element and to output an output signal comprising a series of bits indicating the state of each light sensing element;

    where the series of bits forms a pattern indicating open spaces and closed spaces along the sash panel direction of motion.

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