Title:
SMOKE SENSOR
Document Type and Number:
Japanese Patent JP3227369
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To measure the density of smoke at optional time.
SOLUTION: The smoke sensor is provided with a light emitting part 1 for irradiating space to be measured with light, a photoelectric conversion part 2 for receiving scattered light obtained by scattering irradiating light from the light emitting part 1 by smoke in the space and converting the received light into an electric signal, an analog output part 3 for outputting an analog signal corresponding to smoke density based upon the electric signal outputted from the conversion part 2, and a timing control part 4 for intermittently driving the light emitting part 1 and the conversion part 2. A control signal Tr is inputted from the external to the control part 4. At the time of inputting the control signal Tr, the control part 4 outputs signals for respectively driving the light emitting part 1, the conversion part 2 and the output part 3. Since the smoke density is measured at the time of inputting the control signal Tr from the external, the smoke density can be measured at optional time.
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| JP4927620 | Smoke sensing system |
| JPH07151679 | SMOKE CONCENTRATION MEASURING APPARATUS |
Inventors:
Masanori Hayashi
Application Number:
JP2828296A
Publication Date:
November 12, 2001
Filing Date:
February 15, 1996
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01N21/53; G08B17/10; G08B17/107; (IPC1-7): G08B17/10; G01N21/53; G08B17/107
Domestic Patent References:
| JP573785A | ||||
| JP3250395A | ||||
| JP5494278U |
Attorney, Agent or Firm:
Keisei Nishikawa (1 person outside)