Photoelectric smoke sensor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Aug 13, 2013
Grant Date -
Jun 16, 2011
app pub date -
Dec 1, 2010
filing date -
Dec 10, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Provided is a photoelectric smoke sensor capable of correcting a sensitivity according to a state of contamination. The photoelectric smoke sensor includes: a storage section (6) for storing a zero detection value VN and an initial zero detection value; a moving average value calculating section (51) for calculating a moving average value of detection AD values output from a detection portion (1, 2, 3); a zero detection value updating section (52) for calculating a new zero detection value VN when a sensitivity of the detection portion is decreased as compared with that in an initial state, and in addition, when a rate of change in the moving average value with respect to the zero detection value VN exceeds a predetermined value; a detection AD value correcting section (53) for correcting the detection value; and a smoke-density computing section (54) for converting the corrected detection value into smoke-density data.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | B2 | JP5008712 | Dec 10, 2009 |
| EP | A1 | EP2336994 | Dec 02, 2010 |
| CA | C | CA2724044 | Dec 06, 2010 |
| CN | B | CN102096978 | Dec 09, 2010 |
| MX | A | MX2010013618 | Dec 10, 2010 |
International Classification(s)
- 2010 Application Filing Year
- G01R Class
- 3671 Applications Filed
- 2520 Patents Issued To-Date
- 68.65 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 9 Citation Count
- G01R Class
- 4.69 % this patent is cited more than
- 12 Age
