Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1974-06-14
1976-02-03
Queisser, Richard C.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
73552, 250338, 250340, 340227R, 340421, G08B 1712
Patent
active
039368220
ABSTRACT:
A round detecting method and apparatus are disclosed for automatically detecting the firing of weapons, such as small arms, or the like. Radiant and acoustic energy produced upon occurrence of the firing of the weapon and emanating from the muzzle thereof are detected at known, substantially fixed, distances therefrom. Directionally sensitive radiant and acoustic energy transducer means directed toward the muzzle to receive the radiation and acoustic pressure waves therefrom may be located adjacent each other for convenience. In any case, the distances from the transducers to the muzzle, and the different propagation velocities of the radiant and acoustic waves are known. The detected radiant (e.g. infrared) and acoustic signals are used to generate pulses, with the infrared initiated pulse being delayed and/or extended so as to at least partially coincide with the acoustic initiated pulse; the extension or delay time being made substantially equal to the difference in transit times of the radiant and acoustic signals in traveling between the weapon muzzle and the transducers. The simultaneous occurrence of the generated pulses is detected to provide an indication of the firing of the weapon. With this arrangement extraneously occurring radiant and acoustic signals detected by the transducers will not function to produce an output from the apparatus unless the sequence is correct and the timing thereof fortuitously matches the above-mentioned difference in signal transit times. If desired, the round detection information may be combined with target miss-distance information for further processing and/or recording.
REFERENCES:
patent: 2962696 (1960-11-01), Snyder
patent: 3147380 (1964-09-01), Buckingham et al.
patent: 3254219 (1966-05-01), Finlay et al.
patent: 3281811 (1966-10-01), Cotterman et al.
patent: 3665440 (1972-05-01), McMenamin
patent: 3825754 (1974-07-01), Cinzori et al.
Beckman Victor R.
Kreitman Stephen A.
Queisser Richard C.
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