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Infrared gas spectrometer having a lid assembly with an integrated chopper and chopper motor

  • US 5,818,049 A
  • Filed: 08/29/1997
  • Issued: 10/06/1998
  • Est. Priority Date: 08/29/1997
  • Status: Expired due to Fees
First Claim
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1. A respiratory gas monitor for determining the concentration of one or more pre-defined components of a respiratory gas sample, comprising:

  • a bottom portion having a bottom panel and four walls extending therefrom and a top portion mated to said bottom portion;

    wherein said bottom portion comprises;

    an infrared radiation source for generating a plurality of beams of infrared radiation;

    a sample gas chamber having opposing transparent walls and being positioned for receiving a respiratory gas sample;

    a reference gas chamber having opposing transparent walls and containing a reference gas sample;

    an optical assembly for directing said plurality of beams of infrared radiation through said transparent walls of said sample gas chamber onto a filter/detector assembly;

    said filter/detector assembly for receiving said plurality of beams of infrared radiation which pass through said transparent walls of said sample gas chamber and said reference gas chamber for generating a signal indicative of the concentration of said one or more pre-defined components of said respiratory gas sample and said reference gas sample;

    external power and control circuitry for generating a concentration measurement for said pre-defined components using said signals generated by said filter/detector assembly;

    and, wherein said top portion comprises;

    a substantially planar surface having a thickness;

    a motor disposed on said surface;

    a substantially cylindrical chopper axially and rotatably connected to said motor for selectively illuminating said sample gas chamber and said reference gas chamber;

    a motor position sensor disposed substantially adjacent said motor for providing said control circuitry with a signal indicative of the angular position of said chopper motor;

    and a connector circuit for releasably connecting said motor position sensor and said chopper motor to said control circuitry.

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