GB1188630A - A Device for Measuring Optical Density - Google Patents
A Device for Measuring Optical DensityInfo
- Publication number
- GB1188630A GB1188630A GB35602/68A GB3560268A GB1188630A GB 1188630 A GB1188630 A GB 1188630A GB 35602/68 A GB35602/68 A GB 35602/68A GB 3560268 A GB3560268 A GB 3560268A GB 1188630 A GB1188630 A GB 1188630A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- oscillator
- absorptiometer
- pulses
- burette
- 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
Links
- 230000003287 optical effect Effects 0.000 title abstract 3
- 238000010521 absorption reaction Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000001311 chemical methods and process Methods 0.000 abstract 1
- 238000004448 titration Methods 0.000 abstract 1
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
- G01J1/20—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
-
- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/79—Photometric titration
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Plasma & Fusion (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1,188,630. Photo-electric absorptiometers. COMMISSARIAT A L'ENERGIE ATOMIQUE. July 25, 1968 [Aug.4, 1967], No.35602/68. Heading G1A. In a null balance two path absorptiometer an optical wedge in the reference path is shifted by a pulse motor energized by an oscillator with a frequency proportional to the amplitude of the out of balance signal. Light from a monochromator 3 is switched alternately through a sample 6 and an optical wedge 7 to fall on a photocell 8 connected to a phase sensitive rectifier 9. The oscillator 11 has two channels each comprising transistor-capacitor relaxation oscillators having a frequency controlled by the magnitude of the output of rectifier 9 (one channel if the output is positive, the other if negative). The pulses are fed to a step-by-step wedge motor 13 and an up/down counter 14. The count may be used retro-actively in a chemical process control or to give an alarm at a pre-set value. Automatic titration The absorptiometer may be associated with an automatic titrimeter in which an oscillator energizes a step-by-step motor of a mechanical burette so as to record volume against absorption on a two channel recorder. Alternatively the burette motor may be stopped when a pre-set count on counter 14 shows that the end point has been reached. If the end point corresponds to a point of inflexion on the absorption curve, it may be detected by applying the pulses to a ratemeter and differentiator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR116967A FR1539202A (en) | 1967-08-04 | 1967-08-04 | Spectrophotometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1188630A true GB1188630A (en) | 1970-04-22 |
Family
ID=8636443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35602/68A Expired GB1188630A (en) | 1967-08-04 | 1968-07-25 | A Device for Measuring Optical Density |
Country Status (7)
| Country | Link |
|---|---|
| ES (1) | ES356873A1 (en) |
| FR (1) | FR1539202A (en) |
| GB (1) | GB1188630A (en) |
| IL (1) | IL30460A0 (en) |
| LU (1) | LU56526A1 (en) |
| NL (1) | NL6810927A (en) |
| RO (1) | RO55176A (en) |
-
1967
- 1967-08-04 FR FR116967A patent/FR1539202A/en not_active Expired
-
1968
- 1968-07-18 LU LU56526D patent/LU56526A1/xx unknown
- 1968-07-25 GB GB35602/68A patent/GB1188630A/en not_active Expired
- 1968-07-29 IL IL30460A patent/IL30460A0/en unknown
- 1968-08-01 NL NL6810927A patent/NL6810927A/xx unknown
- 1968-08-03 RO RO57508A patent/RO55176A/ro unknown
- 1968-08-03 ES ES356873A patent/ES356873A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1539202A (en) | 1968-09-13 |
| NL6810927A (en) | 1969-02-06 |
| LU56526A1 (en) | 1968-10-28 |
| RO55176A (en) | 1973-03-15 |
| IL30460A0 (en) | 1970-01-29 |
| ES356873A1 (en) | 1970-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |