GB1089904A - Improvements in or relating to optical measuring or indicating instruments - Google Patents
Improvements in or relating to optical measuring or indicating instrumentsInfo
- Publication number
- GB1089904A GB1089904A GB2925963A GB2925963A GB1089904A GB 1089904 A GB1089904 A GB 1089904A GB 2925963 A GB2925963 A GB 2925963A GB 2925963 A GB2925963 A GB 2925963A GB 1089904 A GB1089904 A GB 1089904A
- Authority
- GB
- United Kingdom
- Prior art keywords
- beams
- attenuator
- sample
- intensity
- sources
- 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 1
- 230000005855 radiation Effects 0.000 abstract 2
- 230000001360 synchronised effect Effects 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification 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
- G01J1/28—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 variation of intensity or distance of source
- G01J1/30—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 variation of intensity or distance of source 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
1,089,904. Photo-electric photo-meters. PYE Ltd. July 24, 1965 [July 24, 1963], No. 29289/63. Heading G1A. In a null balance photo-meter, the sample and attenuator beams are derived from different light sources, and the intensity of auxiliary beams from the two sources are compared to control the relative intensities of the sources. Two beams 1, 14 of radiation from a spectrally variable source 12 pass, one through a sample and the other directly to a detector 19. Similar beams 2, 15 from an auxiliary source 13 comprising a filament lamp and an interference filter pass, one through an attenuator 25 and the other directly to the detector. Beam choppers 17 and 18 operate cyclically to direct to the detector the following beams: first quarter cycle, beam 14; second quarter cycle, beam 15; third and fourth quarter cycles; both beams 1 and 2. A synchronous rectifier 22 operating at twice the chopping frequency produces a signal indicative of the difference in intensity of sources 12 and 13 which is used to alter the current in lamp 13 or adjust an attenuator to equalize the intensity of radiation falling on the sample and attenuator 25. A second synchronous rectifier, 21 operating at the chopping frequency derives a signal indicative of the difference of intensity of the beams 1 and 2 after passing through the sample and attenuator respectively and this difference is nulled by readjustment of the comb attenuator 25, the position of which indicates sample transmissivity. In a modification the four beams 1, 2, 14 and 15 may be simulated by appropriate movement of the source and attenuator into and out of two beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2925963A GB1089904A (en) | 1963-07-24 | 1963-07-24 | Improvements in or relating to optical measuring or indicating instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2925963A GB1089904A (en) | 1963-07-24 | 1963-07-24 | Improvements in or relating to optical measuring or indicating instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1089904A true GB1089904A (en) | 1967-11-08 |
Family
ID=10288674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2925963A Expired GB1089904A (en) | 1963-07-24 | 1963-07-24 | Improvements in or relating to optical measuring or indicating instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1089904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3716300A (en) * | 1971-12-16 | 1973-02-13 | Hitachi Ltd | Null balance triple beam spectrophotometer |
-
1963
- 1963-07-24 GB GB2925963A patent/GB1089904A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3716300A (en) * | 1971-12-16 | 1973-02-13 | Hitachi Ltd | Null balance triple beam spectrophotometer |
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