Patent ID: 6373393
Filing Date: 2002-04-16
Classification: G08B

Abstract:
A flame detection device comprising:a detection element to convert the infrared ray energy into the electrical signal; a first extracting means to extract the representing signal which represents total energy of the first prescribed frequency range including the flicker frequency of the infrared ray energy of the flame from the output signal of said detection element; a second extracting means to extract the representing signal which represents total energy of the second prescribed frequency range including no flicker frequency fc of the infrared ray energy of the flame, but including the frequency on the higher frequency side than the first prescribed frequency range from the output signal of said detection element; and a judging means to judge whether or not a fire is generated based on a result of comparing the output signal of said first extracting means with the output signal of said second extracting means when the output signal of said first extracting means is larger than the output signal of said second extracting means by a prescribed value.