GB1340812A - Log ratio signal processor - Google Patents

Log ratio signal processor

Info

Publication number
GB1340812A
GB1340812A GB55272A GB55272A GB1340812A GB 1340812 A GB1340812 A GB 1340812A GB 55272 A GB55272 A GB 55272A GB 55272 A GB55272 A GB 55272A GB 1340812 A GB1340812 A GB 1340812A
Authority
GB
United Kingdom
Prior art keywords
capacitor
voltage
amplifier
signal
charged
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
GB55272A
Other languages
English (en)
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.)
Damon Corp
Original Assignee
Damon 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 Damon Corp filed Critical Damon Corp
Publication of GB1340812A publication Critical patent/GB1340812A/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
    • G06—COMPUTING OR CALCULATING; 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
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
    • G06G7/75—Analogue computers for specific processes, systems or devices, e.g. simulators for component analysis, e.g. of mixtures, of colours

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Software Systems (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measurement Of Current Or Voltage (AREA)
GB55272A 1971-01-12 1972-01-06 Log ratio signal processor Expired GB1340812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10580271A 1971-01-12 1971-01-12

Publications (1)

Publication Number Publication Date
GB1340812A true GB1340812A (en) 1973-12-19

Family

ID=22307864

Family Applications (1)

Application Number Title Priority Date Filing Date
GB55272A Expired GB1340812A (en) 1971-01-12 1972-01-06 Log ratio signal processor

Country Status (6)

Country Link
US (1) US3733137A (enExample)
CA (1) CA948780A (enExample)
DE (1) DE2201154A1 (enExample)
FR (1) FR2122198A5 (enExample)
GB (1) GB1340812A (enExample)
IT (1) IT948832B (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810696A (en) * 1973-02-20 1974-05-14 Waters Associates Inc Improved analytical apparatus for measuring light absorbance of fluids
US3885879A (en) * 1973-06-25 1975-05-27 Fisher Scientific Co Dual beam spectrophotometer utilizing a spectral wedge and bifurcated fiber optic bundle
US4047819A (en) * 1975-04-10 1977-09-13 Smith Kline Instruments, Inc. Apparatus for measuring optical density with stray light compensation
US3999062A (en) * 1975-10-01 1976-12-21 International Business Machines Corporation Spectrophotometer for dual mode fluorescence analysis
US5013155A (en) * 1989-09-26 1991-05-07 Chemetrics, Inc. Portable spectrophotometric instrument having vial holder and light integrator
US7142307B1 (en) * 1991-03-01 2006-11-28 Stark Edward W Method and apparatus for optical interactance and transmittance measurements

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528749A (en) * 1966-12-09 1970-09-15 Itek Corp Apparatus for measuring optical density
US3566133A (en) * 1968-03-18 1971-02-23 Coulter Electronics A hemoglobin measuring method and apparatus having voltage following with feedback

Also Published As

Publication number Publication date
DE2201154A1 (de) 1972-08-03
FR2122198A5 (enExample) 1972-08-25
US3733137A (en) 1973-05-15
CA948780A (en) 1974-06-04
IT948832B (it) 1973-06-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees