JPS56143947A - Measuring device of transmittance for smoke - Google Patents

Measuring device of transmittance for smoke

Info

Publication number
JPS56143947A
JPS56143947A JP4787380A JP4787380A JPS56143947A JP S56143947 A JPS56143947 A JP S56143947A JP 4787380 A JP4787380 A JP 4787380A JP 4787380 A JP4787380 A JP 4787380A JP S56143947 A JPS56143947 A JP S56143947A
Authority
JP
Japan
Prior art keywords
transmittance
wavelength
coefft
wavelengths
smoke
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
JP4787380A
Other languages
Japanese (ja)
Other versions
JPS612897B2 (en
Inventor
Masayoshi Sakamoto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4787380A priority Critical patent/JPS56143947A/en
Publication of JPS56143947A publication Critical patent/JPS56143947A/en
Publication of JPS612897B2 publication Critical patent/JPS612897B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity

Abstract

PURPOSE:To measure visual transmittance despite the change in the coefft. of wavelength by the constitution consisting of determining the visual transmittance from the relative value of the spectral transmittance signals of two wavelengths at the time of measuring the smoke density in a tunnel. CONSTITUTION:The light emitted from a projecting part passes the inside of smoke and arrives at the objective lens 1 in the photodetecting part, thence it is bisected by a half mirror 3 and the optical density of each wavelength is separated to two by a measuring circuit for spectral transmittace of wavelength lambda1 and a measuring circuit for spectral transmittance of wavelength lambda2. These are held in sample holding circuits 20-23. In a divider 33, the ratio of the ratio of the wavelengths lambda1, lambda2 to a logarithmic value, that is, the coefft. of wavelength is determined, by which the coefft. of correction for the transmittance is transmitted from a function generator 34 to a multiplier 36. In the multiplifer 36, the product of this coefft. of correction and the difference in the optical densities of the two wavelengths is calculated and the output thereof is converted to a visual transmittance by an index converter 37, so that the final output signal is obtained.
JP4787380A 1980-04-10 1980-04-10 Measuring device of transmittance for smoke Granted JPS56143947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4787380A JPS56143947A (en) 1980-04-10 1980-04-10 Measuring device of transmittance for smoke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4787380A JPS56143947A (en) 1980-04-10 1980-04-10 Measuring device of transmittance for smoke

Publications (2)

Publication Number Publication Date
JPS56143947A true JPS56143947A (en) 1981-11-10
JPS612897B2 JPS612897B2 (en) 1986-01-28

Family

ID=12787492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4787380A Granted JPS56143947A (en) 1980-04-10 1980-04-10 Measuring device of transmittance for smoke

Country Status (1)

Country Link
JP (1) JPS56143947A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0843288A (en) * 1994-05-05 1996-02-16 Santa Barbara Res Center Nitrogeb oxide sensor of infrared ray base with steam compensation
EP0877345A2 (en) * 1997-05-08 1998-11-11 Nittan Company, Limited Smoke sensor and monitor control system
KR100494083B1 (en) * 2002-02-08 2005-06-13 주식회사 나라컨트롤 An optical detecting apparatus for measurement visual index and CO
CN105092210A (en) * 2015-04-28 2015-11-25 中国人民解放军海军航空工程学院 Method for simultaneously measuring smoke screen attenuation rate and radiation intensity

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0843288A (en) * 1994-05-05 1996-02-16 Santa Barbara Res Center Nitrogeb oxide sensor of infrared ray base with steam compensation
EP0877345A2 (en) * 1997-05-08 1998-11-11 Nittan Company, Limited Smoke sensor and monitor control system
EP0877345A3 (en) * 1997-05-08 2000-04-19 Nittan Company, Limited Smoke sensor and monitor control system
KR100494083B1 (en) * 2002-02-08 2005-06-13 주식회사 나라컨트롤 An optical detecting apparatus for measurement visual index and CO
CN105092210A (en) * 2015-04-28 2015-11-25 中国人民解放军海军航空工程学院 Method for simultaneously measuring smoke screen attenuation rate and radiation intensity
CN105092210B (en) * 2015-04-28 2017-10-31 中国人民解放军海军航空工程学院 It is a kind of while measuring the method for smoke screen attenuation rate and radiation intensity

Also Published As

Publication number Publication date
JPS612897B2 (en) 1986-01-28

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