Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
FIRE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/189125
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a fire detection device with which it is possible to enhance fire detection accuracy. A fire detection device 1 is provided with: a first light-emitting unit 101 that emits first detection light in a detection space positioned inside or outside the fire detection device 1; a second light-emitting unit 102 that emits second detection light different in wavelength from the first detection light in the detection space; a light-receiving unit 103 that receives scattered light resulting from scattering by smoke of the first detection light emitted by the first light-emitting unit 101 and outputs a first light reception signal that corresponds to the received scattered light, and that receives scattered light resulting from scattering by smoke of the second detection light emitted by the second light-emitting unit 102 and outputs a second light reception signal that corresponds to the received scattered light; and a specification unit 107a that specifies the type of smoke in the detection space on the basis of an output ratio of an output value of the first light reception signal and an output value of the second light reception signal outputted from the light-receiving unit 103 and also on the basis of a rate of increase of the output value of the first light reception signal or the second light reception signal.

Inventors:
DOHI MANABU (JP)
SHIMADZU TOMOHIKO (JP)
WASHIZU KEISUKE (JP)
Application Number:
PCT/JP2019/012774
Publication Date:
October 03, 2019
Filing Date:
March 26, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HOCHIKI CO (JP)
International Classes:
G08B17/107; G08B17/00
Foreign References:
JP2001283340A2001-10-12
JP2013235609A2013-11-21
JP2009295036A2009-12-17
JP2015153058A2015-08-24
JPH06314384A1994-11-08
JPH1123458A1999-01-29
Attorney, Agent or Firm:
SAITO Tatsuya (JP)
Download PDF:



 
Previous Patent: POLISHING COMPOSITION

Next Patent: CPAP APPARATUS