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Patent US3576371A successfully refreshed from Google Patents.
US3576371A
Expired / Lapsed
US
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One way optical ranging system
Assignee: Holobeam Inc
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Filing: 1969-02-05
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Granted: 1971-04-27
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Expires: 1989-02-05
Abstract
Abstract This invention relates to a one way optical range finding system. Optical radiation at two different wavelengths, one of which is substantially unaffected by the atmosphere, is transmitted to a distant object through the atmosphere. The ratios of the received radiation signals at the two wavelengths is used to compensate for the atmospheric effects on the other transmitted wavelength.
Inventors
- 👤 Edward M Ulicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A method for determining distance comprising the steps of: transmitting radiation signals of known intensities through the atmosphere at two different frequencies, one of said frequencies being substantially unaffected by atmosphere; receiving the signals and separating the signals into first and second received signals, determining range by detecting the attenuation of the first received signal, and utilizing the second received signal from the atmospherically unaffected signal to provide a correction factor for said first signal.
Claim 2
Independent Claim
75 words
A method for determining distance comprising the steps of: transmitting radiation signals of known intensities through the atmosphere at two different frequencies, one of said frequencies being substantially unaffected by atmosphere; receiving the signals and separating the signals into first and second received signals, determining range by detecting the attenuation of the first received signal, and utilizing the second received signal from the atmospherically unaffected signal to provide a correction factor for said first signal.
Claim 3
Independent Claim
79 words
A system for avoiding collision between first and second airplanes, said system comprising a transmitter in said first airplanE; a receiver in said second airplane; said transmitter comprising a light source transmitting at least two different frequencies, one of which is optically transparent to the atmosphere, both of said signals being attenuated in accordance with distance between the airplanes, said receiver comprising means to determine the distance of said two aircrafts by utilizing the ratio of the received signals.
Claim 4
Independent Claim
79 words
A system for avoiding collision between first and second airplanes, said system comprising a transmitter in said first airplanE; a receiver in said second airplane; said transmitter comprising a light source transmitting at least two different frequencies, one of which is optically transparent to the atmosphere, both of said signals being attenuated in accordance with distance between the airplanes, said receiver comprising means to determine the distance of said two aircrafts by utilizing the ratio of the received signals.
Claim 5
Dependent Claim
94 words
An optical range measuring system comprising means for transmitting radiation of precisely controlled intensities at first and second different optical wavelengths to a distant object through an atmospheric path, one of said wavelengths being substantially unaffected by atmospheric conditions, means for receiving reflected radiation from said object, said receiving means including means for separating the received radiation into first and second signals at said different wavelengths, and means for sensing the relative intensities of said received signals and for producing a correction signal compensating for the atmospheric effects on the other of said wavelengths.
Claim 6
Dependent Claim
94 words
An optical range measuring system comprising means for transmitting radiation of precisely controlled intensities at first and second different optical wavelengths to a distant object through an atmospheric path, one of said wavelengths being substantially unaffected by atmospheric conditions, means for receiving reflected radiation from said object, said receiving means including means for separating the received radiation into first and second signals at said different wavelengths, and means for sensing the relative intensities of said received signals and for producing a correction signal compensating for the atmospheric effects on the other of said wavelengths.
Claim 7
Dependent Claim
40 words
The system of claim 3, in which said correction signal producing means comprises means for sensing the ratio of said first and second received signals, and further comprising means for multiplying one of said received signals by said correction signal.
Claim 8
Dependent Claim
29 words
The system of claim 4, further comprising a squaring circuit coupled to the output of said multiplier and a range indicator coupled to the output of said squaring circuit.
Claim 9
Dependent Claim
41 words
The system of claim 5, further comprising means for producing a gating signal in response to said one of said received signals, and gating means interposed between said squaring circuit and said indicator and coupled to said gating signal producing means.
Claim 10
Dependent Claim
15 words
The invention of claim 3 in which the two frequencies are approximately 8550A and 8950A.
Claim 11
Dependent Claim
18 words
The lamp of claim 3 in which the light source is a mercury doped cesium iodide light source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |