GB1319070A – Apparatus for sensing a change in light intensity
– Google Patents
GB1319070A – Apparatus for sensing a change in light intensity
– Google Patents
Apparatus for sensing a change in light intensity
Info
Publication number
GB1319070A
GB1319070A
GB3814570A
GB3814570A
GB1319070A
GB 1319070 A
GB1319070 A
GB 1319070A
GB 3814570 A
GB3814570 A
GB 3814570A
GB 3814570 A
GB3814570 A
GB 3814570A
GB 1319070 A
GB1319070 A
GB 1319070A
Authority
GB
United Kingdom
Prior art keywords
intensity
sensor
light
spot
boundary
Prior art date
1969-10-30
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
Application number
GB3814570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Original Assignee
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Priority date (The priority date 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 date listed.)
1969-10-30
Filing date
1970-08-07
Publication date
1973-05-31
1970-08-07
Application filed by Societe dOptique Precision Electronique et Mecanique SOPELEM SA
filed
Critical
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
1973-05-31
Publication of GB1319070A
publication
Critical
patent/GB1319070A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
Abstract
1319070 Monitoring light intensity SOC D’OPTIQUE PRECISION ELECTRONIQUE ET MECANIQUE 7 Aug 1970 [30 Oct 1969] 38145/70 Heading G1A The variation in intensity from the top to the bottom of a light spot 18 focused on an opaque wall 10 of a photo-electric sensor 1 is monitored by moving the sensor, which comprises slits 11-13 of equal width with corresponding identical photocells 14-16 in a direction parallel to the intensity variation. The sensor 1 is reciprocated across the spot, and at the start of each cycle pulses from a generator 21 are supplied to a counter 22. The outputs 51, 52, 53 from the photo-cells 14-16 are supplied to logic circuitry 20 containing two AND gates (28, 31) Fig. 3 (not shown). When the condition (51+53)/2 = 52 is achieved, an amplifier (27) in the circuit changes state, and the counter stops. The count is indicative of the position of median intensity within the spot, i.e. the intensity «boundary». A refractometer employing such a method of intensity measurement is shown in Fig. 5. Light from a source 55 is collinated (56) Fig. 4 (not shown) and after a first reflection at a test liquid/ glass block interface 45, two internal reflections in a prism 43, and a second interface reflection, the beam is focused on to the slits of a sensor 10. The source 55, focusing and collinating assemblies and sensor are attached to an arm 50 which is reciprocated about an axis parallel to the interface 47. As the angle of incidence of the light beam approaches the critical angle, and then passes through this angle, the spot of light focused on the slits undergoes a pronounced change in intensity as the «boundary» sweeps across the light spot. Counting stops when the «boundary» reaches the the centre of the sensor. The recorded count then corresponds to the critical angle, i.e. to the refractive index of the text liquid. In the refractometer the counting pulses result from the motion of the light source 55 and a photocell (62), attached to the arm 50, past opposite sides of a stationary grating 65. To compensate for temperature variations in the test liquid, the grating lines may be non-parallel. A gearing arrangement 69 controlled by a temperature sensor 71 adjusts the part of the grating in the light path and hence the frequency of the pulses.
GB3814570A
1969-10-30
1970-08-07
Apparatus for sensing a change in light intensity
Expired
GB1319070A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR6937413A
FR2063773A5
(en)
1969-10-30
1969-10-30
Publications (1)
Publication Number
Publication Date
GB1319070A
true
GB1319070A
(en)
1973-05-31
Family
ID=9042374
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3814570A
Expired
GB1319070A
(en)
1969-10-30
1970-08-07
Apparatus for sensing a change in light intensity
Country Status (3)
Country
Link
US
(1)
US3672777A
(en)
FR
(1)
FR2063773A5
(en)
GB
(1)
GB1319070A
(en)
Families Citing this family (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS51124977A
(en)
*
1975-04-25
1976-10-30
Hitachi Ltd
Automatic refractometer
JPS51131376A
(en)
*
1975-05-09
1976-11-15
Hitachi Ltd
Refractive index meter
JPS5240187A
(en)
*
1975-09-25
1977-03-28
Hitachi Ltd
Automatic refractometer
US4077488A
(en)
*
1976-06-15
1978-03-07
Sperry Rand Corporation
Guidance assist system for agricultural machines
US4381895A
(en)
*
1980-02-28
1983-05-03
Biovation, Inc.
Method and apparatus for automatic flow-through digital refractometer
IT1136316B
(en)
*
1980-05-21
1986-08-27
Metro Matic Sas Di Poletti R &
OPTICAL SIGNAL DETECTION DEVICE PROVIDED BY A REFRACTOMETER
WO1982001771A1
(en)
*
1980-11-19
1982-05-27
Harold Norris
A refractometer
1969
1969-10-30
FR
FR6937413A
patent/FR2063773A5/fr
not_active
Expired
1970
1970-08-07
GB
GB3814570A
patent/GB1319070A/en
not_active
Expired
1970-09-21
US
US73998A
patent/US3672777A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
DE2036690A1
(en)
1971-05-13
US3672777A
(en)
1972-06-27
FR2063773A5
(en)
1971-07-09
DE2036690B2
(en)
1972-07-27
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Improvements in or relating to the calibration of instruments
Legal Events
Date
Code
Title
Description
1973-10-10
PS
Patent sealed [section 19, patents act 1949]
1975-11-05
435
Patent endorsed ‘licences of right’ on the date specified (sect. 35/1949)
1986-04-03
PCNP
Patent ceased through non-payment of renewal fee
