Flame detectors
First Claim
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1. A flame detector comprising:
- a UV sensor sensitive to solar UV radiation in the UV-C and UV-B wavebands;
a secondary sensor sensitive to non-UV NIR radiation at or near 700 nanometers; and
a controller operatively connected to the UV sensor and the secondary sensor to;
signal an alarm in response to receiving input from the UV sensor indicative of a strong UV source and input from the secondary sensor indicative of a weak non-UV radiation source; and
suppress an alarm in response to receiving a signal from the UV sensor indicative of a weak UV source and a signal from the secondary sensor indicative of a strong non-UV radiation source to distinguish between flames and solar UV including UV-B radiation.
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Abstract
A flame detector includes a UV sensor sensitive to solar UV radiation and a secondary sensor sensitive to non-UV radiation. A controller is operatively connected to the UV sensor and the secondary sensor to: signal an alarm in response to receiving input from the UV sensor indicative of a strong UV source and input from the secondary sensor indicative of a weak non-UV radiation source; and suppress an alarm in response to receiving a signal from the UV sensor indicative of a strong UV source and a signal from the secondary sensor indicative of a strong non-UV radiation source.
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Citations
14 Claims
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1. A flame detector comprising:
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a UV sensor sensitive to solar UV radiation in the UV-C and UV-B wavebands; a secondary sensor sensitive to non-UV NIR radiation at or near 700 nanometers; and a controller operatively connected to the UV sensor and the secondary sensor to; signal an alarm in response to receiving input from the UV sensor indicative of a strong UV source and input from the secondary sensor indicative of a weak non-UV radiation source; and suppress an alarm in response to receiving a signal from the UV sensor indicative of a weak UV source and a signal from the secondary sensor indicative of a strong non-UV radiation source to distinguish between flames and solar UV including UV-B radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of flame detection comprising:
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signaling an alarm in response to receiving input from a UV sensor indicative of a strong UV source and input from the secondary sensor indicative of a weak non-UV radiation source emitting non-UV NIR radiation at or near 700 nanometers, wherein the UV sensor is sensitive to solar UV radiation in the UV-C and the UV-B waveband; and suppressing an alarm in response to receiving a signal from the UV sensor indicative of a weak UV source and a signal from the secondary sensor indicative of a strong non-UV radiation source, thereby distinguishing between flames and solar UV including UV-B radiation. - View Dependent Claims (12, 13, 14)
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Specification