Title:
FIRE DETECTION SYSTEM, DISCHARGE PROBABILITY CALCULATION METHOD, AND RECEIVED LIGHT QUANTITY MEASURING METHOD
Document Type and Number:
Japanese Patent JP2020153753
Kind Code:
A
Abstract:
To calculate the probability of non-regular discharge of an optical sensor.SOLUTION: A fire detection system comprises: an optical sensor 1 for detecting light radiated from a light source 100; an applied voltage generation circuit 12 for applying a drive pulse voltage to the optical sensor 1; a discharge determination unit 201 for detecting discharge from the optical sensor 1; a discharge probability calculation unit 202 for calculating a discharge probability for each of a first state in which the optical sensor 1 is shaded and a second state in which the optical sensor 1 is shaded and a pulse width of the drive pulse voltage is different than that in the first state; a sensitivity parameter storage unit 19 for storing a reference pulse width of the drive pulse voltage as a known sensitivity parameter of the optical sensor 1; and a discharge probability calculation unit 203 for calculating the discharge probability of a non-regular discharge that occurs independently of a received light quantity of the optical sensor 1, on the basis of the sensitivity parameter, the discharge probabilities that were calculated in the first and second states and the pulse width of the drive pulse voltages in the first and second states.SELECTED DRAWING: Figure 1
Inventors:
KONUMA SHUN
MORI RAITA
MORI RAITA
Application Number:
JP2019051091A
Publication Date:
September 24, 2020
Filing Date:
March 19, 2019
Export Citation:
Assignee:
AZBIL CORP
International Classes:
G01J1/42
Domestic Patent References:
| JP2018084423A | 2018-05-31 | |||
| JPH0512581A | 1993-01-22 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa