Fire sensor and fire detecting method
First Claim
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1. A fire sensor comprising:
- a smoke detecting portion for detecting a smoke signal which changes in response to a smoke density to output it;
an external temperature detecting portion for detecting an external temperature of the sensor to output it;
a temperature difference calculating portion for calculating temperature difference, which indicates a rate of temperature rise when the sensor receives heat generated by a fire, between the external temperature and the internal temperature;
a correction factor deciding portion for deciding a correction factor for the smoke signal based on the external temperature and the temperature difference; and
a smoke signal correcting portion for correcting the smoke signal by multiplying the smoke signal by the correction factor.
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Abstract
A temperature difference calculator portion detects temperature difference indicating the rate of temperature rise when it receives heat generated by the fire. A correction factor deciding portion decides a correction factor for a smoke signal based on an external temperature and the temperature difference. Finally, a smoke data correction portion corrects smoke data by multiplying the smoke signal detected by a smoke detector and the correction factor.
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Citations
16 Claims
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1. A fire sensor comprising:
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a smoke detecting portion for detecting a smoke signal which changes in response to a smoke density to output it; an external temperature detecting portion for detecting an external temperature of the sensor to output it; a temperature difference calculating portion for calculating temperature difference, which indicates a rate of temperature rise when the sensor receives heat generated by a fire, between the external temperature and the internal temperature; a correction factor deciding portion for deciding a correction factor for the smoke signal based on the external temperature and the temperature difference; and a smoke signal correcting portion for correcting the smoke signal by multiplying the smoke signal by the correction factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fire detecting method comprising:
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a smoke detecting step of detecting a smoke signal which changes in response to a smoke density to output it; an external temperature detecting step of detecting an external temperature of the sensor to output it; an internal temperature detecting step of detecting an internal temperature of the sensor to output it; a temperature difference calculating step of calculating temperature difference between the external temperature, which indicates a rate of temperature rise when the sensor receives heat generated by a fire, and the internal temperature; a correction factor deciding step of deciding a correction factor for the smoke signal based on the external temperature and the temperature difference; and a smoke signal correcting step of correcting the smoke signal by multiplying the smoke signal by the correction factor.
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16. A fire detecting method comprising:
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a smoke detecting step of detecting a smoke signal which changes in response to a smoke density to output it; an external temperature detecting step of detecting an external temperature of the sensor to output it; a temperature difference calculating step of calculating temperature difference between the external temperature, which indicates a rate of temperature rise when the sensor receives heat generated by a fire, and a pseudo output (reference temperature) which is regarded as an internal temperature of the sensor; a correction factor deciding step of deciding a correction factor for the smoke signal based on the external temperature and the temperature difference; and a smoke signal correcting step of correcting the smoke signal by multiplying the smoke signal by the correction factor.
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Specification