GB1005422A - Method and means for photoelectric measuring - Google Patents

Method and means for photoelectric measuring

Info

Publication number
GB1005422A
GB1005422A GB24706/62A GB2470662A GB1005422A GB 1005422 A GB1005422 A GB 1005422A GB 24706/62 A GB24706/62 A GB 24706/62A GB 2470662 A GB2470662 A GB 2470662A GB 1005422 A GB1005422 A GB 1005422A
Authority
GB
United Kingdom
Prior art keywords
cells
radiation
measurements
cell
temperature
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
GB24706/62A
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.)
Pfizer Health AB
Original Assignee
LKB Produkter AB
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 LKB Produkter AB filed Critical LKB Produkter AB
Publication of GB1005422A publication Critical patent/GB1005422A/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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4228—Photometry, e.g. photographic exposure meter using electric radiation detectors arrangements with two or more detectors, e.g. for sensitivity compensation
    • 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
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
    • G01J1/24—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors
    • G01J1/26—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors adapted for automatic variation of the measured or reference 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
    • 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
    • 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
    • G01J3/513—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters having fixed filter-detector pairs

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

Abstract

1,005,422. Temperature coefficient correction in photo-electric measurements. LKBPRODUKTER A.B. June 27, 1962 [June 29,1961], No. 24706/62. Drawings to Specification. Heading G1A. In photo-electric measurements involving the use of at least two photo-electric cells, the cells being identical but being arranged to be influenced by different ranges of wavelength of radiation, it is found that the cells exhibit different variations in sensitivity with the variations in temperature. Where the signals from the two cells are combined, e.g. differentially, elimination of the effects of temperature variation is not therefore obtained. It has been found, however, that substantially identical sensitivity versus temperature characteristics can be obtained by arranging for different intensities of radiation to impinge each cell dependent on the wavelength ranges involved. In carrying out the invention, this is effected by including a suitable grey filter in the radiation path to each cell, the densities of the filters being selected to obtain the desired equal temperature coefficients as a preliminary step before actual measurements are made. Furthermore, the cells are mounted, e.g. on a common high conductivity plate, so that all obtain approximately the same temperature. The invention is stated to be of application in connection with measurements on radiation sources but is described in detail only as applied to an apparatus for making absorption measurements on fluids, Fig. 1 (not shown). Radiation from a lamp housing is directed over four paths to four photo-electric cells, one comprising a reference cell and the remaining three comprising measuring cells. In the radiation path to each measuring cell there is provided a transparent tube (positioned between two slots) which contains or is traversed by fluid on which the absorption measurements are to be made. Each radiation path also includes a colour filter, that in the path to the reference cell being chosen either to include the wavelengths allotted to the measuring cells or a wavelength approximately centrally of the range allotted to the measuring cells. In accordance with the invention each radiation path also includes a grey filter arranged to adjust the radiation intensity so that the cells exhibit substantially identical temperature dependent characteristics. The cells are also mounted on a common plate of aluminium or silicon-aluminium so as to equalize their temperatures. Measurements are made by comparing the outputs from two cells, either two measuring cells or one measuring cell and the reference cell, in a conventional motor-driven potentiometer recorder. Reference is made to the use of adjustable interference wedges for the colour filters and adjustable grey wedges. It is also stated that the method of the invention may be employed to correct for differences in cell temperature characteristics due to values of electrical loads connected to the cells.
GB24706/62A 1961-06-29 1962-06-27 Method and means for photoelectric measuring Expired GB1005422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE680661 1961-06-29

Publications (1)

Publication Number Publication Date
GB1005422A true GB1005422A (en) 1965-09-22

Family

ID=20269656

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24706/62A Expired GB1005422A (en) 1961-06-29 1962-06-27 Method and means for photoelectric measuring

Country Status (2)

Country Link
FR (1) FR1513209A (en)
GB (1) GB1005422A (en)

Also Published As

Publication number Publication date
FR1513209A (en) 1968-02-16

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