US4373916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weapon effect simulators
Assignee: Gemalto Terminals Ltd
•
Filing: 1980-05-22
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Granted: 1983-02-15
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Expires: 2000-05-22
Abstract
Abstract In a weapon effect simulator a low peak power laser projector emits one millisecond bursts of radiation, each burst having either pulse or continuous wave modulation at 170 kHz. A detector for sensing the radiation has several photocells connected in parallel to a single amplifier, and includes a band pass filter tuned to 170 kHz (chosen in harmonic relationship to the modulation frequency) and having a pass band of 2 kHz (inversely related to the duration of each radiation burst).
Inventors
- 👤 David W. Ashford
- 👤 Robert Hummel-Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:40
CPC Classifications
F; F41; F41G; F41G3/00; F41G3/26; F41G3/2616; F41G3/2622; F41G3/2655; F41G3/2666
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A weapon effect simulator having a projector arranged to project a beam of electromagnetic radiation during simulated firing of a weapon and a detector arranged to detect incidence of said radiation thereupon, characterised in that: aid projector is arranged to generate at least one burst of radiation for each said firing, said burst being of predetermined duration and being modulated at a predetermined frequency; and in that said detector includes frequency-selective means tuned to a frequency harmonically related to said predetermined frequency and having a pass band dependent upon said predetermined duration.
Claim 2
Dependent Claim
92 words
A weapon effect simulator having a projector arranged to project a beam of electromagnetic radiation during simulated firing of a weapon and a detector arranged to detect incidence of said radiation thereupon, characterised in that: aid projector is arranged to generate at least one burst of radiation for each said firing, said burst being of predetermined duration and being modulated at a predetermined frequency; and in that said detector includes frequency-selective means tuned to a frequency harmonically related to said predetermined frequency and having a pass band dependent upon said predetermined duration.
Claim 3
Dependent Claim
12 words
A simulator according to claim 1, wherein said modulation is pulse modulation.
Claim 4
Dependent Claim
12 words
A simulator according to claim 1, wherein said modulation is continuous-wave modulation.
Claim 5
Dependent Claim
16 words
A simulator according to claim 1, wherein said frequency-selective means is tuned to said predetermined frequency.
Claim 6
Dependent Claim
21 words
A simulator according to claim 1, wherein said pass band is substantially equal to twice the reciprocal of said predetermined duration.
Claim 7
Dependent Claim
22 words
A simulator according to claim 1, wherein said detector has a plurality of light-sensitive cells coupled in parallel to a single amplifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |