Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-07-17
2000-02-01
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250221, 356 28, G01N 2186
Patent
active
060205946
ABSTRACT:
A chronograph for determining the muzzle velocity of a projectile fired from either a small arm or a rifle includes two IR light beam assemblies attached to a platform with respective photodetection circuits and a clamp for holding a vertical shot dispersion monitoring target plate at a rear extremity of the platform. The photodetection circuits provide start and stop signals for gating clock pulses of known frequency to an internal counter, the velocity being a scaled inverse of the measured interval. Each light beam assembly has two facing parabolic slit mirrors or reflectors with a photoemitter placed at one focal point and a photodetector at the other focal point for forming thin spaced beams oriented orthogonal to an intended path of the projectile. The photodetector circuit responds to a rapid drop in the total photocurrent of the photodetector in response to the partial blocking of the beam by a passing projectile. The photodetector circuit is DC coupled to the photodetector for providing an unsaturated calibration output signal. Also disclosed are design parameters for the parabolic mirrors and a method for calibrating the chronograph.
REFERENCES:
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patent: 3624401 (1971-11-01), Stoller
patent: 4128761 (1978-12-01), Oehler
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patent: 5577733 (1996-11-01), Downing
"Shooting Chrony" brochure; Shooting Chrony Inc., N. Tonawanda, NY; 1 p.; Jan. 1996.
"Oehler Ballistic Chronographs" brochure; Oehler Research, Inc., Austin, TX; cover, table of contents, pp. 1-7, 28; Jan. 1996.
Le Que T.
Seccombe Stephen R.
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