Smoke sensor and monitor control system
First Claim
1. A smoke sensor comprising:
- light receiving means for temporally alternately receiving scattered light of two different wavelengths λ
1 and λ
2 ;
calculating means for performing a calculation required for smoke detection, on a scattered light output y of the wavelength λ
1 and a scattered light output g of the wavelength λ
2 from said light receiving means; and
smoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means, said calculating means estimating an output value of one of the scattered light output y of the wavelength λ
1 and the scattered light output g of the wavelength λ
2 which are temporally alternately output from said light-receiving means, at a sample timing of the other output, and obtaining a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio.
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Accused Products
Abstract
A smoke sensor includes a light receiving unit for temporally alternately receiving scattered light of two different wavelengths λ1 and λ2 ; a calculating unit for performing a calculation required for smoke detection, on a scattered light output y of the wavelength λ1 and a scattered light output g of the wavelength λ2 from the light receiving unit; and a smoke detection processing unit for performing a smoke detection process on the basis of a calculation result output from the calculating unit. The calculating unit estimates an output value of one of the scattered light output y of the wavelength λ1 and the scattered light output g of the wavelength λ2 at a sample timing of the other output, and obtains a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio.
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Citations
15 Claims
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1. A smoke sensor comprising:
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light receiving means for temporally alternately receiving scattered light of two different wavelengths λ
1 and λ
2 ;calculating means for performing a calculation required for smoke detection, on a scattered light output y of the wavelength λ
1 and a scattered light output g of the wavelength λ
2 from said light receiving means; andsmoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means, said calculating means estimating an output value of one of the scattered light output y of the wavelength λ
1 and the scattered light output g of the wavelength λ
2 which are temporally alternately output from said light-receiving means, at a sample timing of the other output, and obtaining a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A smoke sensor comprising:
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controlling means for controlling a whole of said sensor; first light emitting means for, when driven by said controlling means, emitting light of a wavelength λ
1 ;second light emitting means for, when driven by said controlling means, emitting light of a wavelength λ
2 ;light receiving means for receiving scattered light of the light of the wavelength λ
1 emitted from said first light emitting means, and scattered light of the light of the wavelength λ
2 emitted from said second light emitting means;calculating means for performing a calculation required for smoke detection on a scattered light output y of the wavelength λ
1 and a scattered light output g of the wavelength λ
2 from said light receiving means; andsmoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means, said first and second light emitting means being incorporated in a single light emitting device, and the light of the wavelength λ
1 and the light of the wavelength λ
2 being emitted from said single light emitting device.
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12. A smoke sensor comprising:
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controlling means for controlling a whole of said sensor; first light emitting means for, when driven by said controlling means, emitting light of a wavelength λ
1 ;second light emitting means for, when driven by said controlling means, emitting light of a wavelength λ
2 ;light receiving means for receiving scattered light of the light of the wavelength λ
1 emitted from said first light emitting means, and scattered light of the light of the wavelength λ
2 emitted from said second light emitting means;calculating means for performing a calculation required for smoke detection on a scattered light output y of the wavelength λ
1 and a scattered light output g of the wavelength λ
2 from said light receiving means;smoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means; and light guiding means for guiding the light of the wavelength λ
1 emitted from said first light emitting means, and the light of the wavelength λ
2 emitted from said second light emitting means so that the light of the wavelength λ
1 emitted from said first light emitting means, and the light of the wavelength λ
2 emitted from said second light emitting means are directed in a same light emission direction. - View Dependent Claims (13, 14)
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15. A monitor control system comprising:
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a receiver; and an analog light scattering smoke sensor which is connected to a transmission path elongating from said receiver and which is monitored and controlled by said receiver, wherein, when said analog light scattering smoke sensor is a smoke sensor which temporally alternately receives scattered light of two different wavelengths λ
1 and λ
2, said receiver comprises;calculating means for performing a calculation required for smoke detection, on a scattered light output y of the wavelength λ
1 and a scattered light output g of the wavelength λ
2 from said light receiving means; andsmoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means, said calculating means estimating an output value of one of the scattered light output y of the wavelength λ
1 and the scattered light output g of the wavelength λ
2 which are temporally alternately output from said light scattering smoke sensor, at a sample timing of the other output, and obtaining a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio.
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Specification