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Environment monitor

  • US 5,811,811 A
  • Filed: 01/08/1997
  • Issued: 09/22/1998
  • Est. Priority Date: 05/08/1995
  • Status: Expired due to Fees
First Claim
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1. An environment monitoring apparatus comprising:

  • a plurality of sensors for separating incident infrared radiation into a plurality of wavelength bands, sensing the intensity of infrared radiation of each separated wavelength band, and enabling detecting of a temperature of a monitored area on the basis of outputs of the sensors;

    a disc having a plurality of radially aligned slits, each slit having approximately the same width as a diameter of a photoreceptor of a sensor anda rotary chopper being arranged to coaxially rotate with said disc, wherein when one of the slits faces a sensor, the disc and the chopper are rotated at a rotational speed so that the incident infrared radiation into each sensor is chopped 2 to 16 times by the chopper; and

    wherein said plurality of sensors are arranged in at least two sets, each set of which comprises a plurality of sensors for sensing infrared radiation at different wavelength bands relative to one another, the sensors being arranged behind the chopper and the disc along a radial direction centered at a rotational axis of the chopper.

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