GB1128446A - Measurement of turbidity of fluids - Google Patents

Measurement of turbidity of fluids

Info

Publication number
GB1128446A
GB1128446A GB4812964A GB4812964A GB1128446A GB 1128446 A GB1128446 A GB 1128446A GB 4812964 A GB4812964 A GB 4812964A GB 4812964 A GB4812964 A GB 4812964A GB 1128446 A GB1128446 A GB 1128446A
Authority
GB
United Kingdom
Prior art keywords
turbidity
amplifier
light
photo
cells
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
GB4812964A
Inventor
Ronald Briggs
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB4812964A priority Critical patent/GB1128446A/en
Publication of GB1128446A publication Critical patent/GB1128446A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1,128,446. Photo-electric turbidity measurement. NATIONAL RESEARCH DEVELOPMENT CORP. Jan. 3, 1966 [Nov. 26, 1964], No. 48129/64. Heading G1A. The turbidity of a fluid is measured by directing light into the fluid and detecting the light transmitted directly through and light scattered at right angles to the direct path, using respective photocells, to obtain signals which are multiplied together to provide a resultant signal proportional to the turbidity. In the embodiment described, two lamps L 1 , L 2 are arranged on two adjacent sides of the sample cell and two CdS photoresistors P 1 , P 2 on the other two sides. The lamps are arranged in a circuit, Fig. 2, such that at any one time only one lamp is switched on, and that the cell receiving directly transmitted light is connected in the input circuit of an amplifier, and the cell receiving scattered light at right angles to the transmitted beam, is connected into the negative feedback circuit of the amplifier. This causes an effective multiplication of signals from the photo-cells. The lamps and connections of the photo-cells are switched alternately at, say, 5 minute intervals, the output of the amplifier being stored in turn in two capacitors. The stored voltages can then be added to obtain a voltage representative of the turbidity. A difference value of the two stored voltages can be used to trigger an automatic clearing system for this adding arrangement. If monochromatic light sources are used, multiplication of the two stored amplifier output signals may give a more accurate result. A mathematical explanation is given of the dependence of turbidity on the sum or product of the two amplifier outputs, and of the effects of uneven fouling of photo-cells or mismatching of the cells due to unequal fatigue.
GB4812964A 1964-11-26 1964-11-26 Measurement of turbidity of fluids Expired GB1128446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4812964A GB1128446A (en) 1964-11-26 1964-11-26 Measurement of turbidity of fluids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4812964A GB1128446A (en) 1964-11-26 1964-11-26 Measurement of turbidity of fluids

Publications (1)

Publication Number Publication Date
GB1128446A true GB1128446A (en) 1968-09-25

Family

ID=10447492

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4812964A Expired GB1128446A (en) 1964-11-26 1964-11-26 Measurement of turbidity of fluids

Country Status (1)

Country Link
GB (1) GB1128446A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8355132B2 (en) 2007-04-06 2013-01-15 Qiagen Gaithersburg, Inc. Sample adequacy measurement system having a plurality of sample tubes and using turbidity light scattering techniques
US8877507B2 (en) 2007-04-06 2014-11-04 Qiagen Gaithersburg, Inc. Ensuring sample adequacy using turbidity light scattering techniques
US9476895B2 (en) 2007-04-06 2016-10-25 Becton, Dickinson And Company Open platform automated sample processing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8355132B2 (en) 2007-04-06 2013-01-15 Qiagen Gaithersburg, Inc. Sample adequacy measurement system having a plurality of sample tubes and using turbidity light scattering techniques
US8877507B2 (en) 2007-04-06 2014-11-04 Qiagen Gaithersburg, Inc. Ensuring sample adequacy using turbidity light scattering techniques
US9476895B2 (en) 2007-04-06 2016-10-25 Becton, Dickinson And Company Open platform automated sample processing system

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