US3598492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical calibrating device including light diffusers arranged to simulate a path of back-scattered light
Assignee: Impulsphysik GmbH
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Filing: 1968-12-22
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Granted: 1971-08-10
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Expires: 1988-12-22
Abstract
Abstract Cooperating first and second light diffusers are arranged such as to simulate a path of backscattered light between a light impulse transmitter and receiver. The light diffusers respectively extend at inclined angles relative to each other and to the transmitter and receiver. The first diffuser is operative for diffusely reflecting incident light from the transmitter to the second diffuser and the latter is operative for diffusely reflecting incident light from the first diffuser to the receiver. A diaphragm with adjustable apertures between the second diffuser and the receiver varies the amount of light reflected to the receiver to thereby permit simulation of different visual ranges.
Inventors
- 👤 Frank Fruengel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:16
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/538
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A calibrating device especially for use for gaging the light impulse transmitter and receiver of visual range meters for metering back scattered light, the combination comprising, optical means for simulating a path of backscattered light between the light impulse transmitter and receiver, said optical means comprising cooperating first and second light diffusing members respectively extending at inclined angles relative to each other and to said transmitter and receiver, said first member being operative for diffusely reflecting incident light from said transmitter to said second member, and said second member Being operative for diffusely reflecting incident light from said first member to said receiver; and light adjusting means for varying the amount of flow of scattered light in said calibrating device on to said receiver and to thereby permit simulation of different visual ranges.
Claim 2
Dependent Claim
133 words
A calibrating device especially for use for gaging the light impulse transmitter and receiver of visual range meters for metering back scattered light, the combination comprising, optical means for simulating a path of backscattered light between the light impulse transmitter and receiver, said optical means comprising cooperating first and second light diffusing members respectively extending at inclined angles relative to each other and to said transmitter and receiver, said first member being operative for diffusely reflecting incident light from said transmitter to said second member, and said second member Being operative for diffusely reflecting incident light from said first member to said receiver; and light adjusting means for varying the amount of flow of scattered light in said calibrating device on to said receiver and to thereby permit simulation of different visual ranges.
Claim 3
Dependent Claim
20 words
A device as defined in claim 1, wherein said first and second light diffusing members have roughened light diffusing surfaces.
Claim 4
Dependent Claim
14 words
A device as defined in claim 2, wherein said light diffusing surfaces are dull-finished.
Claim 5
Dependent Claim
18 words
A device as defined in claim 2, wherein said light diffusing surfaces are made of a fine-granular material.
Claim 6
Dependent Claim
19 words
A device as defined in claim 2, wherein said first and second light diffusing members are made of glass.
Claim 7
Dependent Claim
34 words
A device as defined in claim 1, wherein said first and second light diffusing members are tiltable about their longitudinal axis of symmetry so as to adjust the respective inclined angles of said members.
Claim 8
Dependent Claim
92 words
A device as defined in claim 1, wherein said first and second light diffusing members are so positioned with reference to said transmitter and said receiver that light passing from the former to the latter via said light diffusing members and said light adjusting means is compelled to traverse a substantially U-shaped path having two spaced at least substantially parallel path portions and a transverse path portion connecting said parallel path portions, said light diffusing members being located at the intersections of said transverse path portion with the respective parallel path portions.
Claim 9
Dependent Claim
34 words
A device as defined in claim 7, wherein said light adjusting means is located in one of said two at least substantially parallel path portions intermediate said second light diffusing member and said receiver.
Claim 10
Dependent Claim
37 words
A device as defined in claim 8, wherein said light adjusting means is a diaphragm having a plurality of adjustable apertures extending in the path of light reflected from said second light diffusing member to said receiver.
Claim 11
Dependent Claim
21 words
A device as defined in claim 9, wherein said light adjusting means comprises a calibrated scale to indicate different visual ranges.
Claim 12
Dependent Claim
95 words
A device as defined in claim 1, and comprising a housing including a base portion accommodating said first light diffusing member, and a tubular arm portion extending from and connected to said base portion, said arm portion having an inner end portion opening into said base portion and accommodating said second light diffusing member, and an outer open end portion removable coupled to and communicating with said receiver, and wherein said light-adjusting means is a diaphragm having adjustable aperture means and located in said arm portion intermediate said second light diffusing member and said receiver.
References Cited (Backward Citations)
US3234846A
Cited
GB1088437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |