Title:
SMOKE SENSOR
Document Type and Number:
Japanese Patent JP3783991
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To correctly detect a smoke density based on an integral quantity without being affected by the difference of the distribution of grain diameters even if the difference exists by the kind of smoke.
SOLUTION: A threshold value judging part 24 sets plural threshold values to a photodetective pulse signal photodetected by a photodetecting part 17 to judge a threshold corresponding to the pulse height value of the photodetective pulse signal. In a case where the judged threshold value of the part 24 is not larger than a prescribed value, the pulse height value of the photodetective pulse signal corresponding to this judged threshold value is corrected to a larger pulse height value by a wave height value correcting part 25 and integrated by an integrating part 26 to obtain smoke density by a smoke density converting part 27.
Inventors:
Ichiro Endo
Toi studies
Toi studies
Application Number:
JP14890598A
Publication Date:
June 07, 2006
Filing Date:
May 29, 1998
Export Citation:
Assignee:
Hochiki Corporation
International Classes:
G08B17/10; G08B17/107; (IPC1-7): G08B17/10
Domestic Patent References:
| JP8202970A | ||||
| JP7151680A | ||||
| JP6259674A | ||||
| JP7012724A | ||||
| JP64035485U | ||||
| JP6347180A | ||||
| JP6103475A | ||||
| JP2300647A | ||||
| JP9223284A |
Attorney, Agent or Firm:
Susumu Takeuchi
Saichiro Miyauchi
Saichiro Miyauchi