GB1285885A - Improvements in or relating to nephelometers - Google Patents
Improvements in or relating to nephelometersInfo
- Publication number
- GB1285885A GB1285885A GB5290668A GB5290668A GB1285885A GB 1285885 A GB1285885 A GB 1285885A GB 5290668 A GB5290668 A GB 5290668A GB 5290668 A GB5290668 A GB 5290668A GB 1285885 A GB1285885 A GB 1285885A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- light
- visibility
- detector
- measuring
- 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
- 239000012530 fluid Substances 0.000 abstract 2
- 229910052724 xenon Inorganic materials 0.000 abstract 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 abstract 2
- 239000002245 particle Substances 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
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
- G01N21/47—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
- G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility
-
- 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
- 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
- G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
Landscapes
- Physics & Mathematics (AREA)
- General 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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1285885 Measuring scattered light photoelectrically UNITED KINGDOM ATOMIC ENERGY AUTHORITY 10 Oct 1969 [7 Nov 1968] 52906/68 Heading G1A In a device for measuring light scattered from suspended particles in a fluid 25 and having a lightsource 13, e.g. a xenon flash lamp with a diffusing screen 14, and a photo-detector 12, e.g. a photo-multiplier, a switchable means 22 provides alternately a reference light path 32 and a path 26 for scattered light, the output of the detector during successive reference periods being maintained constant by a control means, Fig.2 (not shown) which adjusts the sensitivity of the detector 12 and/or the intensity of the source 13. The switchable means 22 is an apertured rotatable disc, and the light-source is arranged to pulse only when either the reference path 32 or measuring path 26 is unobscured by the disc. The detector output is fed to an analogue-to-digital converter (33), and during reference periods the ADC output is supplied to a ratemeter (43) and then to a comparator (44) where it is compared with a reference voltage, any resulting error signal being arranged to control the HT voltage to the photo-multiplier. The error signal may also be used to control the discharge voltage of the source 13. A circuit is described, Fig.3 (not shown) for stabilizing the mains supply voltage to the xenon discharge tube. The amount of light scattered from the fluid, which may be an atmospheric sample, and hence its visibility, is determined by summing the number of pulses generated by the ADC during a number of measuring periods to give the average visibility during those periods. Alternatively, a log ratemeter (42) may be provided to give an analogue output representative of the visibility, and this output may be arranged to switch on fog lamps at a certain level of visibility .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5290668A GB1285885A (en) | 1968-11-07 | 1968-11-07 | Improvements in or relating to nephelometers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5290668A GB1285885A (en) | 1968-11-07 | 1968-11-07 | Improvements in or relating to nephelometers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1285885A true GB1285885A (en) | 1972-08-16 |
Family
ID=10465777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5290668A Expired GB1285885A (en) | 1968-11-07 | 1968-11-07 | Improvements in or relating to nephelometers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1285885A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121168A (en) * | 1982-06-03 | 1983-12-14 | Seiko Instr & Electronics | X-ray device |
| GB2127538A (en) * | 1982-09-24 | 1984-04-11 | Seiko Instr & Electronics | X-ray device |
| GB2202624A (en) * | 1987-03-23 | 1988-09-28 | Dr Basil Polychronopulos | Optimum biasing system for electronic devices |
| EP1137917A1 (en) * | 1998-12-03 | 2001-10-04 | Varian Australia Pty. Ltd. | Uv-vis spectrophotometry |
-
1968
- 1968-11-07 GB GB5290668A patent/GB1285885A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121168A (en) * | 1982-06-03 | 1983-12-14 | Seiko Instr & Electronics | X-ray device |
| GB2127538A (en) * | 1982-09-24 | 1984-04-11 | Seiko Instr & Electronics | X-ray device |
| GB2202624A (en) * | 1987-03-23 | 1988-09-28 | Dr Basil Polychronopulos | Optimum biasing system for electronic devices |
| EP1137917A1 (en) * | 1998-12-03 | 2001-10-04 | Varian Australia Pty. Ltd. | Uv-vis spectrophotometry |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |