JPS6449934A - Optical densitometer - Google Patents
Optical densitometerInfo
- Publication number
- JPS6449934A JPS6449934A JP20679287A JP20679287A JPS6449934A JP S6449934 A JPS6449934 A JP S6449934A JP 20679287 A JP20679287 A JP 20679287A JP 20679287 A JP20679287 A JP 20679287A JP S6449934 A JPS6449934 A JP S6449934A
- Authority
- JP
- Japan
- Prior art keywords
- light
- calibration
- sample
- measured
- proper value
- 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.)
- Pending
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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
-
- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/3181—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using LEDs
-
- 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N2021/635—Photosynthetic material analysis, e.g. chrorophyll
-
- 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
- G01N2021/8466—Investigation of vegetal material, e.g. leaves, plants, fruits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
- G01N2201/0621—Supply
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
PURPOSE:To preclude following unnecessary measurement due to a failure in preliminarily adjustment and to improve the accuracy and efficiency of measurement by deciding whether or not the quantity of light in a specific wavelength range of a light source is a proper value at the time of calibration and performing the measuring operation only when the quantity of the light is the proper value. CONSTITUTION:When processing is set in calibration mode, a control arithmetic circuit 21 operates light sources 4 and 5 and a photodetecting means 6 while a sample is not inserted or while a filter for calibration is inserted and measures the quantity of the light of the specific wavelength of the light sources 4 and 5. Then the arithmetic circuit 21 decides whether or not the measured quantity of light is within a predetermined proper range. When it is judged that the quantity is the proper value, the control circuit 21 enables following measuring operation and stores the quantity of light measured at the time of calibration in a storage means 26. Then, the quantity of light stored in the storage means 26 and the quantity of sample transmitted light which is measured next are used to calculate the density of a specific substance in the sample, e.g. chlorophyll.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20679287A JPS6449934A (en) | 1987-08-20 | 1987-08-20 | Optical densitometer |
US07/227,999 US4986665A (en) | 1987-08-06 | 1988-08-03 | Optical density detector |
GB08818568A GB2208001A (en) | 1987-08-06 | 1988-08-04 | Optical density detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20679287A JPS6449934A (en) | 1987-08-20 | 1987-08-20 | Optical densitometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449934A true JPS6449934A (en) | 1989-02-27 |
Family
ID=16529172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20679287A Pending JPS6449934A (en) | 1987-08-06 | 1987-08-20 | Optical densitometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449934A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009270898A (en) * | 2008-05-02 | 2009-11-19 | Sumitomo Electric Ind Ltd | Biosensor measuring instrument and sensor system |
-
1987
- 1987-08-20 JP JP20679287A patent/JPS6449934A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009270898A (en) * | 2008-05-02 | 2009-11-19 | Sumitomo Electric Ind Ltd | Biosensor measuring instrument and sensor system |
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