GB1312784A - Scientific instruments - Google Patents
Scientific instrumentsInfo
- Publication number
- GB1312784A GB1312784A GB1312784DA GB1312784A GB 1312784 A GB1312784 A GB 1312784A GB 1312784D A GB1312784D A GB 1312784DA GB 1312784 A GB1312784 A GB 1312784A
- Authority
- GB
- United Kingdom
- Prior art keywords
- refractive index
- critical angle
- proportional
- photo
- prism
- 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
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
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (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
1312784 Measuring angles; measuring refractive index electrically BELLINGHAM & STANLEY Ltd 15 Dec 1970 [19 Dec 1969] 62018/69 Headings G1J G1N and G1X [Also in Divisions G2 and G4] A refractometer includes an arrangement for producing an output proportional to the refractive index. In one form Fig. 4 a prism 6 is illuminated at grazing incidence and a telescope mounted on pivoted link 11 aligned at the critical angle, the length of a telescopic link 17, 18 then being directly proportional to the sine of the critical angle and therefore to the refractive index in a modification Fig.6, the telescope is stationary and the prism rotated, the length of telescopic link 29, 30 being proportional to the refractive index. The length of the telescopic link may be read by a pointer and scale Figs. 4, 6, a linear potentiometric transducer Fig. 11 (not shown), in association with a recorder or a digital voltmeter, an optical grating the lines of which are counted photo-electrically, or by an optical grating cooperating with a matching segment to produce a fringe pattern counted photo-electrically Fig.8. The critical angle may be detected by means of a cross wire or a photo-electric device and a servocontrolled drive may be produced for automatically aligning the telescope to the critical angle. In the automatic refractometer of Fig. 8, a motor 47 drives a pin 48 engaging slot 49 in link 42 and oscillates the prism through an angular range. As the critical angle is passed through, this is detected by photo-cell 63 which prevents further counting of the fringes produced by grating 52 so that the reading representing the refractive index is maintained in the counter. A second scale may be provided to indicate a function of the refractive index such as sugar concentration. Alternative by the output of a potentiometric transducer representing the refractive index may be processed electronically to produce a signal representing the sugar concentration Fig. 11 (not shown). The arrangement of links may be modified so that the devices of figs. 4 and 6 produce an output proportional to the cosine in addition to or instead of that proportional to the sine.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6201869 | 1969-12-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1312784A true GB1312784A (en) | 1973-04-04 |
Family
ID=10487783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1312784D Expired GB1312784A (en) | 1969-12-19 | 1969-12-19 | Scientific instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1312784A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982001771A1 (en) * | 1980-11-19 | 1982-05-27 | Harold Norris | A refractometer |
-
1969
- 1969-12-19 GB GB1312784D patent/GB1312784A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982001771A1 (en) * | 1980-11-19 | 1982-05-27 | Harold Norris | A refractometer |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |