EP0075422A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Measuring performance of reflex reflectors
Assignee: SARGROVE AUTOMATION Ltd
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Filing: 1982-09-10
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Granted: —
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Expires: 2002-09-10
Abstract
Abstract A photometer for testing reflex reflectors including a photo-diode light sensor (5) and measuring circuitry for measuring light reflected from the reflector under test (4). A light source (1) is positioned adjacent one end of a fibre optic bundle (3) whose other end is directed at the reflector under test, and the reflected light is measured via another fibre optic bundle (7) which directs the light onto the photo-diode (5).
Inventors
- 👤 Dixie Michael Vick
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:09
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/005; G01N; G01N21/00; G01N21/17; G01N21/55
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A photometer for testing reflex reflectors and including light sensing means and measuring ciruitry for measuring the light reflected from a reflector, characterised in that the photometer also includes a light source (1, 2) and a first optical fibre or bundle of optical fibres (3) having one end adjacent the said light source, a second optical fibre or bundle of optical fibres (7) having one end adjacent to the light sensor (5) the two fibres or bundles having their other ends arranged parallel to one another and directed towards a test position (4) where the reflector under test is positioned, in use, and light shielding means (8) around the test position ends of the fibres and adapted to cooperate with the refletor under test to exclude extraneous light.
Claim 2
Dependent Claim
128 words
A photometer for testing reflex reflectors and including light sensing means and measuring ciruitry for measuring the light reflected from a reflector, characterised in that the photometer also includes a light source (1, 2) and a first optical fibre or bundle of optical fibres (3) having one end adjacent the said light source, a second optical fibre or bundle of optical fibres (7) having one end adjacent to the light sensor (5) the two fibres or bundles having their other ends arranged parallel to one another and directed towards a test position (4) where the reflector under test is positioned, in use, and light shielding means (8) around the test position ends of the fibres and adapted to cooperate with the refletor under test to exclude extraneous light.
Claim 3
Dependent Claim
26 words
A photometer according to claim 1 further characterised in that the fibres are arranged in two bundles which are closely spaced at their test position ends.
Claim 4
Dependent Claim
33 words
A photometer according to claim 2 further characterised in that the test portion ends of the fibres (3) supplying the light are grouped around the corresponding ends (7) of those receiving the light.
Claim 5
Dependent Claim
19 words
A photometer according to any preceding claim, further characterised in that the light shielding means comprises an elongated tube.
Claim 6
Dependent Claim
42 words
A photometer according to claim 4 in which the said elongated tube is telescopic, whereby, in use, the maximum observation angle may be adjusted by adjusting the distance between the said second ends of the optical fibres and the reflector under test.
Claim 7
Dependent Claim
43 words
A photometer according to claim 5 further comprising a central disc mounted in the outer end of the telescopic tube so as to limit the minimum observation angle as between the said second ends of the optical fibres and the reflector under test.
Claim 8
Dependent Claim
55 words
A photometer according to claim 1 in which the measuring circuitry includes an operational amplifier having first and second inputs, and the light sensor comprises a photo-diode connected to one input of the amplifier, the said one input also having a feedback circuit connected thereto, a potential divider being connected to the other said input.
References Cited (Backward Citations)
No citation records indexed.
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