Patent US4346992A successfully refreshed from Google Patents.
US4346992A
Expired / Lapsed
US
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Laser detector and spectral analyzer
Assignee: Lockheed Martin Corp
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Filing: 1973-02-15
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Granted: 1982-08-31
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Expires: 1993-02-15
Abstract
Abstract There is herein disclosed a laser detector and spectral analyzer comprising a plurality of photoelectric detector elements, at least, two of which are suitably masked and disposed behind a wedge type interference filter. An additional detector element is operated without any mask or filter. The detector output signals are electronically processed to provide a substantially instantaneous and independent indication of the mean spectral wavelength, spectral width, total power and pulse length of radiant energy incident upon the apparatus.
Inventors
- 👤 Jacob Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:01
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
Apparatus for the detection and spectral analysis of radiant light energy comprising: a wedge filter having a predetermined variation in optical passband which is dependent upon the position thereon; photoelectric detection means disposed behind said filter and responsive to energy transmitted thereby to produce a first output signal which increases linearly with the position at which energy is transmitted by said filter and a second output signal which increases quadratically with said position; and signal processing means coupled to said detection means for combining said output signals such as to provide outputs representative of selected spectral properties of said energy.
Claim 2
Dependent Claim
100 words
Apparatus for the detection and spectral analysis of radiant light energy comprising: a wedge filter having a predetermined variation in optical passband which is dependent upon the position thereon; photoelectric detection means disposed behind said filter and responsive to energy transmitted thereby to produce a first output signal which increases linearly with the position at which energy is transmitted by said filter and a second output signal which increases quadratically with said position; and signal processing means coupled to said detection means for combining said output signals such as to provide outputs representative of selected spectral properties of said energy.
Claim 3
Dependent Claim
67 words
Apparatus as recited in claim 1 wherein: said wedge filter passband varies with position along a longitudinal axis thereof; and said detection means comprises a first photoelectric detector element having an aperture mask on the radiation incident side thereof which increases linearly with longitudinal position, and a second photoelectric detector element having an aperture mask on the rediation incident side thereof which increases quadratically with longitudinal position.
Claim 4
Dependent Claim
40 words
Apparatus as recited in claim 2 further including: a third photoelectric detector element disposed such as to be fully exposed to radiation transmitted by said filter and producing a third output signal representative of the amount of energy incident thereon.
Claim 5
Dependent Claim
22 words
Apparatus as recited in claim 3 further including: means coupled to said third detector for including the power of radiation incident thereon.
Claim 6
Dependent Claim
24 words
Apparatus as recited in claim 4 wherein: said third output signal is applied to said power indicating means through a peak and hold circuit.
Claim 7
Dependent Claim
54 words
Apparatus as recited in claim 3 wherein said signal processing means includes: first divider means for dividing said first output signal by said third output signal to thereby provide a signal representative of the longitudinal position at which said energy is transmitted by said filter and thus representative of the wavelength of said energy.
Claim 8
Dependent Claim
22 words
Apparatus as recited in claim 3 further including: means coupled to said first dividing means for indicating the wavelength of said energy.
Claim 9
Dependent Claim
76 words
Apparatus as recited in claim 6 wherein said signal processing means further includes: second divider means for dividing said second output signal by said third output signal, means for squaring the output signal from said first divider, and means coupled to said second divider means and said squaring means for subtracting said squaring means output signal from said second divider output signal to produce a signal representative of the square of the bandwidth of said energy.
Claim 10
Dependent Claim
24 words
Apparatus as recited in claim 8 further including: means coupled to said subtracting means for indicating the square of the bandwidth of said energy.
Claim 11
Dependent Claim
34 words
Apparatus as recited in claim 1 further including: a cone channel optical element disposed on the light incident side of said filter whereby the field-of-view of said apparatus is limited to a preselected value.
Claim 12
Dependent Claim
38 words
Apparatus as recited in claim 1 further including: a diffusing screen disposed adjacent said filter and receiving an image of said energy transmitted by said filter, and means for imaging said diffusing screen upon said photoelectric detection means.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |