CA1012248A - Logarithmic circuit - Google Patents

Logarithmic circuit

Info

Publication number
CA1012248A
CA1012248A CA161,175A CA161175A CA1012248A CA 1012248 A CA1012248 A CA 1012248A CA 161175 A CA161175 A CA 161175A CA 1012248 A CA1012248 A CA 1012248A
Authority
CA
Canada
Prior art keywords
logarithmic circuit
logarithmic
circuit
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.)
Expired
Application number
CA161,175A
Other languages
English (en)
Other versions
CA161175S (en
Inventor
Alex W. Dreyfoos (Jr.)
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.)
Photo Electronics Corp
Original Assignee
Photo Electronics 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 Photo Electronics Corp filed Critical Photo Electronics Corp
Application granted granted Critical
Publication of CA1012248A publication Critical patent/CA1012248A/en
Expired 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
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G01J3/524—Calibration of colorimeters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions
    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Amplifiers (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
CA161,175A 1972-01-14 1973-01-12 Logarithmic circuit Expired CA1012248A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21777572A 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
CA1012248A true CA1012248A (en) 1977-06-14

Family

ID=22812459

Family Applications (1)

Application Number Title Priority Date Filing Date
CA161,175A Expired CA1012248A (en) 1972-01-14 1973-01-12 Logarithmic circuit

Country Status (5)

Country Link
US (1) US3724954A (US06653308-20031125-C00199.png)
JP (1) JPS5538708B2 (US06653308-20031125-C00199.png)
CA (1) CA1012248A (US06653308-20031125-C00199.png)
DE (1) DE2301656C2 (US06653308-20031125-C00199.png)
GB (1) GB1372832A (US06653308-20031125-C00199.png)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH566543A5 (US06653308-20031125-C00199.png) * 1972-04-28 1975-09-15 Micromedic Systems Inc
US3876878A (en) * 1972-05-22 1975-04-08 Said Frank By Said Miles And A Control system for color pattern generator
US3828226A (en) * 1972-12-20 1974-08-06 Carlson Co Chesley F Exposure override control
JPS5059034A (US06653308-20031125-C00199.png) * 1973-09-24 1975-05-22
US3909609A (en) * 1973-10-29 1975-09-30 Xerox Corp Light source measuring apparatus
US3984185A (en) * 1974-08-19 1976-10-05 Durst Ag Fabrik Fototechnischer Apparate Bozen Process and apparatus for filter value and exposure time determination in photographic color printing and enlarging
US4075559A (en) * 1975-07-24 1978-02-21 Westinghouse Electric Corporation Technique for extending the range of a signal measuring circuit
US4236079A (en) * 1977-12-02 1980-11-25 General Electric Company Tomographic scanning apparatus
US4309604A (en) * 1978-07-24 1982-01-05 Sharp Kabushiki Kaisha Apparatus for sensing the wavelength and intensity of light
US4231654A (en) * 1979-04-27 1980-11-04 Michael E. Gorski Controller for photographic enlarger or the like
JPS58223040A (ja) * 1982-06-22 1983-12-24 Nippon Koden Corp 呼吸気ガス濃度測定装置
US4628277A (en) * 1985-05-01 1986-12-09 General Electric Company Femtoammeter
US4792829A (en) * 1986-04-03 1988-12-20 Firmani Alexander D Light-exposure control unit
US7498779B2 (en) * 2005-01-28 2009-03-03 Broadcom Corporation Voltage supply interface with improved current sensitivity and reduced series resistance
WO2014089123A1 (en) 2012-12-03 2014-06-12 Forrest James Brown Low noise detection system using log detector amplifier
WO2014152307A1 (en) 2013-03-15 2014-09-25 Dockon Ag Low-power, noise insensitive communication channel using logarithmic detector amplifier (lda) demodulator
WO2014144919A1 (en) * 2013-03-15 2014-09-18 Forrest James Brown Power combiner and fixed/adjustable cpl antennas
US9236892B2 (en) 2013-03-15 2016-01-12 Dockon Ag Combination of steering antennas, CPL antenna(s), and one or more receive logarithmic detector amplifiers for SISO and MIMO applications
WO2014144958A1 (en) 2013-03-15 2014-09-18 Forrest James Brown Frequency selective logarithmic amplifier with intrinsic frequency demodulation capability
CN105765601B (zh) 2013-09-12 2020-03-06 多康公司 在通信装置的接收链中使用的系统和方法
US11183974B2 (en) 2013-09-12 2021-11-23 Dockon Ag Logarithmic detector amplifier system in open-loop configuration for use as high sensitivity selective receiver without frequency conversion
US11082014B2 (en) 2013-09-12 2021-08-03 Dockon Ag Advanced amplifier system for ultra-wide band RF communication

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237028A (en) * 1963-02-21 1966-02-22 James F Gibbons Logarithmic transfer circuit
US3448289A (en) * 1966-05-20 1969-06-03 Us Navy Logarthmic amplifier
US3528749A (en) * 1966-12-09 1970-09-15 Itek Corp Apparatus for measuring optical density
GB1214172A (en) * 1968-07-22 1970-12-02 Crosfield Electronics Ltd Improvements relating to image reproducing apparatus
GB1297364A (US06653308-20031125-C00199.png) * 1969-04-16 1972-11-22
US3653759A (en) * 1970-12-08 1972-04-04 Eastman Kodak Co Automatic control of color correction of photographic printers

Also Published As

Publication number Publication date
DE2301656A1 (de) 1973-07-19
US3724954A (en) 1973-04-03
JPS48104447A (US06653308-20031125-C00199.png) 1973-12-27
GB1372832A (en) 1974-11-06
DE2301656C2 (de) 1983-05-26
JPS5538708B2 (US06653308-20031125-C00199.png) 1980-10-06

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