GB1072372A - A photometer - Google Patents

A photometer

Info

Publication number
GB1072372A
GB1072372A GB4714562A GB4714562A GB1072372A GB 1072372 A GB1072372 A GB 1072372A GB 4714562 A GB4714562 A GB 4714562A GB 4714562 A GB4714562 A GB 4714562A GB 1072372 A GB1072372 A GB 1072372A
Authority
GB
United Kingdom
Prior art keywords
lamp
vessel
potentiometer
source
calibration
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
GB4714562A
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.)
Individual
Original Assignee
Individual
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
Priority to NL301802D priority Critical patent/NL301802A/xx
Application filed by Individual filed Critical Individual
Priority to GB4714562A priority patent/GB1072372A/en
Publication of GB1072372A publication Critical patent/GB1072372A/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
    • G01N21/274—Calibration, base line adjustment, drift correction
    • 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
    • G01N21/251—Colorimeters; Construction thereof
    • 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

Landscapes

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

Abstract

1,072,372. Photo-electric measurement of transmissivity. H. HESSE. Dec. 11, 1963 [Dec. 13, 1962], No.47145/62. Heading G1A. In apparatus for measuring the optical transmissivity of test samples having means for periodically resetting the calibration an indication is given if the resetting means is moved beyond a certain point. In one embodiment light from a source 5 is directed through a vessel 9 to a photoelectric detector 10 coupled to a meter 13. The lamp is energized through a voltage stabilizer 1 and the arm 8 of an adjustable potentiometer 4. To calibrate the apparatus the vessel 9 is filled with distilled water and the potentiometer adjusted until the meter reads zero absorption. Replacement of the water by the test sample or series of samples then enables absorption measurements to be made. Due to the ageing of the lamp and detector or the dirtying of the surfaces of the test vessel, the voltage it is necessary to apply to the lamp at successive calibration operations gradually increases until it reaches a point at which the apparatus readings are no longer reliable and other action has to be taken. To indicate when this point has been reached the arm 8 of the potentiometer is arranged to then close the circuit of a warning light 15. Arrangements may also be made to indicate when variations in the voltage stabilizer output occur. Instead of varying the source intensity the source may be supplied with a constant voltage and calibration adjustment effected by the use of an iris diaphragm or grey wedge. The attenuator control being arranged to give an excessive adjustment indication in one of the ways mentioned.
GB4714562A 1962-12-13 1962-12-13 A photometer Expired GB1072372A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL301802D NL301802A (en) 1962-12-13
GB4714562A GB1072372A (en) 1962-12-13 1962-12-13 A photometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4714562A GB1072372A (en) 1962-12-13 1962-12-13 A photometer

Publications (1)

Publication Number Publication Date
GB1072372A true GB1072372A (en) 1967-06-14

Family

ID=10443894

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4714562A Expired GB1072372A (en) 1962-12-13 1962-12-13 A photometer

Country Status (2)

Country Link
GB (1) GB1072372A (en)
NL (1) NL301802A (en)

Also Published As

Publication number Publication date
NL301802A (en)

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