JPS5679946A - Optical densitometer - Google Patents

Optical densitometer

Info

Publication number
JPS5679946A
JPS5679946A JP15758979A JP15758979A JPS5679946A JP S5679946 A JPS5679946 A JP S5679946A JP 15758979 A JP15758979 A JP 15758979A JP 15758979 A JP15758979 A JP 15758979A JP S5679946 A JPS5679946 A JP S5679946A
Authority
JP
Japan
Prior art keywords
amplifier
output
inputted
voltage
converted
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
JP15758979A
Other languages
Japanese (ja)
Inventor
Yoshikazu Kimura
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.)
Dainippon Screen Manufacturing Co Ltd
Original Assignee
Dainippon Screen Manufacturing 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 Dainippon Screen Manufacturing Co Ltd filed Critical Dainippon Screen Manufacturing Co Ltd
Priority to JP15758979A priority Critical patent/JPS5679946A/en
Priority to GB8037652A priority patent/GB2064760B/en
Publication of JPS5679946A publication Critical patent/JPS5679946A/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
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE: To make accuracy and temp. characteristics good by using a semiconductor photodetector and digitally logarithmically converting the output thereof by making use of its short-circuited current.
CONSTITUTION: The output current of a photodetector 1 proportional to the quantity of the light measured is inputted to an operational amplifier 2, by which it is converted to voltage and this voltage is outputted therefrom. A circuit connected with analog switches 4aW4d respectively to feedback resistances 3aW3d is connected in parallel to the amplifier 2, and an arbitrary one of the resistances 3a...and the amplifier 2 are connected in parallel. The output voltage of the amplifier 2 is inputted to an A/D converter 5, and the output digitally converted there is inputted to an arithmetic processing circuit 6, where it is logarithmically converted by a suitable approximate expression and is displayed in a display device 7.
COPYRIGHT: (C)1981,JPO&Japio
JP15758979A 1979-12-05 1979-12-05 Optical densitometer Pending JPS5679946A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP15758979A JPS5679946A (en) 1979-12-05 1979-12-05 Optical densitometer
GB8037652A GB2064760B (en) 1979-12-05 1980-11-24 Light meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15758979A JPS5679946A (en) 1979-12-05 1979-12-05 Optical densitometer

Publications (1)

Publication Number Publication Date
JPS5679946A true JPS5679946A (en) 1981-06-30

Family

ID=15653001

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15758979A Pending JPS5679946A (en) 1979-12-05 1979-12-05 Optical densitometer

Country Status (2)

Country Link
JP (1) JPS5679946A (en)
GB (1) GB2064760B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3536245A1 (en) * 1984-10-12 1986-04-17 Dai Nippon Insatsu K.K., Tokio/Tokyo DEVICE FOR MEASURING THE OPTICAL DENSITY / GRID POINT AREA
FR2581492A1 (en) * 1985-05-06 1986-11-07 Inovelf Sa LOGARITHMIC CONVERTERS AND THEIR APPLICATION TO LIGHT MEASUREMENT TRANSMITTED
JPS62123553U (en) * 1986-01-28 1987-08-05

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62215848A (en) * 1986-03-18 1987-09-22 Hochiki Corp Sensing apparatus
CN102970076B (en) * 2012-11-07 2015-09-09 武汉光迅科技股份有限公司 A kind of photoelectric detective circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49114486A (en) * 1973-02-28 1974-10-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49114486A (en) * 1973-02-28 1974-10-31

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3536245A1 (en) * 1984-10-12 1986-04-17 Dai Nippon Insatsu K.K., Tokio/Tokyo DEVICE FOR MEASURING THE OPTICAL DENSITY / GRID POINT AREA
FR2581492A1 (en) * 1985-05-06 1986-11-07 Inovelf Sa LOGARITHMIC CONVERTERS AND THEIR APPLICATION TO LIGHT MEASUREMENT TRANSMITTED
JPS62123553U (en) * 1986-01-28 1987-08-05

Also Published As

Publication number Publication date
GB2064760A (en) 1981-06-17
GB2064760B (en) 1984-01-25

Similar Documents

Publication Publication Date Title
JPS57148221A (en) Temperature detecting device
JPS5551361A (en) Range switching device for electric measuring instrument
JPS5679946A (en) Optical densitometer
DK683887A (en) measuring circuit
JPS55155253A (en) Output compensation circuit for bridge type measuring apparatus
JPS6442924A (en) Digital/analog converter
JPS5638755A (en) Sample location displaying device
ATE26342T1 (en) MEASURING DEVICE FOR DETECTING A TEMPERATURE DIFFERENCE.
KR790001827Y1 (en) Temperature measurement device
SU669484A1 (en) Logarithmic analogue-digital converter
SU659973A1 (en) Power factor- to-code converter
SU940742A1 (en) Apparatus for measuring electric resistance of human skin
JPS56128411A (en) Voice output electric meter
SU599347A1 (en) Voltage-to-frequency converter
JPS5748665A (en) Resistance component measuring circuit
JPS5229777A (en) Small-size measuring instrument
JPS54126565A (en) Resistance-electric signal converter
JPS5524684A (en) Digital multimeter
JPS5651609A (en) Input circuit
JPS53125076A (en) Dynamic characteristic measuring circuit
JPS5649949A (en) Electric hygrometer
JPS5567658A (en) Measurement unit for poly phase alternating current
JPS5394982A (en) Output display device
JPS5447462A (en) Dc signal isolator
JPS53115159A (en) Multiplying equipment using hall device