JPS5716338A - Light absorption measuring equipment with locked-in amplifier - Google Patents

Light absorption measuring equipment with locked-in amplifier

Info

Publication number
JPS5716338A
JPS5716338A JP9037180A JP9037180A JPS5716338A JP S5716338 A JPS5716338 A JP S5716338A JP 9037180 A JP9037180 A JP 9037180A JP 9037180 A JP9037180 A JP 9037180A JP S5716338 A JPS5716338 A JP S5716338A
Authority
JP
Japan
Prior art keywords
mirror
light
light absorption
amplifier
locked
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
JP9037180A
Other languages
Japanese (ja)
Inventor
Mamoru Sugimoto
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP9037180A priority Critical patent/JPS5716338A/en
Publication of JPS5716338A publication Critical patent/JPS5716338A/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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems

Abstract

PURPOSE:To remove the back ground disturbance, by a method wherein the ON- OFF difference of light, synchronized with the incoming light signals divided periodically by a chopper, is amplified. CONSTITUTION:The incident light 2 is divided into two by a mirror 10. A chopper 2 is set behind the mirror 10 and in the first half period of the chopper movement, the incident light strikes a mirror 9 of high reflectance and in the second half period, it strikes a test sample 8. By this measure, the signal of difference between the reflected light by the mirror 9 and that of the test sample 8 enters into a locked-in amplifier as input. Accordingly, the effect of light absorption by the presence of water vapour, for example, is removed and only the light absorption characteristics of the test sample can be measured.
JP9037180A 1980-07-02 1980-07-02 Light absorption measuring equipment with locked-in amplifier Pending JPS5716338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9037180A JPS5716338A (en) 1980-07-02 1980-07-02 Light absorption measuring equipment with locked-in amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9037180A JPS5716338A (en) 1980-07-02 1980-07-02 Light absorption measuring equipment with locked-in amplifier

Publications (1)

Publication Number Publication Date
JPS5716338A true JPS5716338A (en) 1982-01-27

Family

ID=13996695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9037180A Pending JPS5716338A (en) 1980-07-02 1980-07-02 Light absorption measuring equipment with locked-in amplifier

Country Status (1)

Country Link
JP (1) JPS5716338A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101160676B1 (en) 2010-01-05 2012-06-28 (주)동양화학 Turbidity mesuring apparatus
GB2489582A (en) * 2011-03-28 2012-10-03 Nec Corp Image capturing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101160676B1 (en) 2010-01-05 2012-06-28 (주)동양화학 Turbidity mesuring apparatus
GB2489582A (en) * 2011-03-28 2012-10-03 Nec Corp Image capturing device
US9164030B2 (en) 2011-03-28 2015-10-20 Nec Corporation Image capturing device and image capturing method
GB2489582B (en) * 2011-03-28 2015-11-11 Nec Corp Image capturing device and image capturing method

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