JPS57192816A - Visibility measuring device - Google Patents

Visibility measuring device

Info

Publication number
JPS57192816A
JPS57192816A JP7772481A JP7772481A JPS57192816A JP S57192816 A JPS57192816 A JP S57192816A JP 7772481 A JP7772481 A JP 7772481A JP 7772481 A JP7772481 A JP 7772481A JP S57192816 A JPS57192816 A JP S57192816A
Authority
JP
Japan
Prior art keywords
light
signal
taken out
light emitting
visibility
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.)
Pending
Application number
JP7772481A
Other languages
Japanese (ja)
Inventor
Kohei Noro
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7772481A priority Critical patent/JPS57192816A/en
Publication of JPS57192816A publication Critical patent/JPS57192816A/en
Pending 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
    • G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility

Abstract

PURPOSE:To measure the visibility in an arbitrary range simple by integrating received light having back scattering and reference received light without back scattering and obtaining the difference. CONSTITUTION:A sequence generating circuit generates periodic signals (a)-(d). A light emitting diode 3 sends transmitting light from a transmitting lens 4 through an amplifier 2. The reflected light from the target due to the back scatter is received by a light detector 6 through a receiving lens 5. A switch 11 is conducted by a timing signal (b) which is delayed from the signal (a) by t1. Integrators 15 and 16 are alternately selected by the periodic signal (c) whose period is a half the light emitting period of the light emitting diode 3. The signal light and the reference light without back scatter are separately integrated. The signal (d) is taken out by a differential amplifier 17, and the difference between both outputs is taken out. Only the back scatter intensity data is taken out and displayed on a voltmeter 10. Therefore, the visibility at the arbitrary range is simply measured.
JP7772481A 1981-05-22 1981-05-22 Visibility measuring device Pending JPS57192816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7772481A JPS57192816A (en) 1981-05-22 1981-05-22 Visibility measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7772481A JPS57192816A (en) 1981-05-22 1981-05-22 Visibility measuring device

Publications (1)

Publication Number Publication Date
JPS57192816A true JPS57192816A (en) 1982-11-27

Family

ID=13641838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7772481A Pending JPS57192816A (en) 1981-05-22 1981-05-22 Visibility measuring device

Country Status (1)

Country Link
JP (1) JPS57192816A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110927117A (en) * 2019-10-30 2020-03-27 航天新气象科技有限公司 Forward scattering visibility meter and parameter determination method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154351A (en) * 1978-05-25 1979-12-05 Canon Inc Distance measuring device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154351A (en) * 1978-05-25 1979-12-05 Canon Inc Distance measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110927117A (en) * 2019-10-30 2020-03-27 航天新气象科技有限公司 Forward scattering visibility meter and parameter determination method

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