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Combined UV/IR flame detection system

  • US 5,339,070 A
  • Filed: 07/21/1992
  • Issued: 08/16/1994
  • Est. Priority Date: 07/21/1992
  • Status: Expired due to Term
First Claim
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1. A flame detection system comprising:

  • an ultraviolet optical sensor, and first and second infrared optical sensors, each of said sensors being adapted for converting electromagnetic energy inputs to electrical outputs, each of said sensors having optical filter means for restricting passage of electromagnetic energy to predetermined wavelengths and amplifier means for amplifying the output thereof;

    means connected to the amplifier means of said ultraviolet optical sensor for limiting the amplifier output in response to reception by said ultraviolet sensor of electromagnetic energy which exceeds a predetermined energy level;

    an electrical bridge circuit means having a resistor as each of two legs thereof and having said first and said second infrared optical sensors respectively as the other legs thereof, said bridge circuit being adapted to receive an electrical input at the connections between each said resistor and infrared optical sensor and to provide output signals from connections made between each of said resistors and between each of said infrared optical sensors;

    a following amplifier being capacitively coupled to the output of said electrical bridge circuit;

    means connected to the outputs of said ultraviolet optical sensor and each of said infrared optical sensors for converting the analog signals therefrom to digital data streams;

    means for processing said data streams;

    means providing temporary storage of said data;

    means within said processing means for establishing threshold levels to discriminate against predetermined types of signals;

    means within said processing means for testing and comparing processed outputs from said ultraviolet and said infrared sensors so as to determine whether flame conditions are indicated;

    means for producing an alarm signal in response to a determination by the processing means that flame conditions have been detected.

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