JPS6462796A - Dimming type sensor - Google Patents

Dimming type sensor

Info

Publication number
JPS6462796A
JPS6462796A JP21907887A JP21907887A JPS6462796A JP S6462796 A JPS6462796 A JP S6462796A JP 21907887 A JP21907887 A JP 21907887A JP 21907887 A JP21907887 A JP 21907887A JP S6462796 A JPS6462796 A JP S6462796A
Authority
JP
Japan
Prior art keywords
fire
decision
value
reference value
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP21907887A
Other languages
Japanese (ja)
Other versions
JP2577002B2 (en
Inventor
Shunichi Morita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Priority to JP21907887A priority Critical patent/JP2577002B2/en
Publication of JPS6462796A publication Critical patent/JPS6462796A/en
Application granted granted Critical
Publication of JP2577002B2 publication Critical patent/JP2577002B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To quickly detect even a slowly spreading fire, by inhibiting correction of a reference value for fire decision in case of considerable reduction from a normal value of the output of a light reception part. CONSTITUTION:When the output of a light reception part 13 is reduced and the absolute value of the change value first exceeds a threshold for negative change value decision in a ROM 4, a fire decision reference value storage means RAM 2 stores the output of the light reception part at this time as the reference value for first decision. A dimming rate calculating means calculates the dimming rate of the output of the light reception part to the reference value for fire decision at each time of sampling, and the reference value for fire decision is not updated as long as the absolute value of the change value exceeds the threshold for negative change value decision. A fire deciding means outputs a fire signal when the dimming rate is higher than the threshold for fire decision over a prescribed number of times of sampling. Thus, probability of failure in reporting of even a slowly raising fire is reduced and the fire is surely decided.
JP21907887A 1987-09-03 1987-09-03 Dimming sensor Expired - Fee Related JP2577002B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21907887A JP2577002B2 (en) 1987-09-03 1987-09-03 Dimming sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21907887A JP2577002B2 (en) 1987-09-03 1987-09-03 Dimming sensor

Publications (2)

Publication Number Publication Date
JPS6462796A true JPS6462796A (en) 1989-03-09
JP2577002B2 JP2577002B2 (en) 1997-01-29

Family

ID=16729915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21907887A Expired - Fee Related JP2577002B2 (en) 1987-09-03 1987-09-03 Dimming sensor

Country Status (1)

Country Link
JP (1) JP2577002B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016051390A (en) * 2014-09-01 2016-04-11 能美防災株式会社 Extinction type smoke detector and extinction type smoke detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016051390A (en) * 2014-09-01 2016-04-11 能美防災株式会社 Extinction type smoke detector and extinction type smoke detection system

Also Published As

Publication number Publication date
JP2577002B2 (en) 1997-01-29

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