Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1997-04-28
1998-12-15
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055922, 2502081, 738656, 280739, 356376, B60R 2116
Patent
active
058500855
ABSTRACT:
The disclosed invention is a method of and a system for taking digital measurements of vehicle air bag deployment characteristics versus time in which the key parameter measured is air bag envelope throw, outboard from the storage canister from which envelope leading edge velocity is derived. Also measured are squib voltage, squib current, and exhaust gas temperature. Envelope throw is recorded on three axes, the central, left diagonal and right diagonal, which are instrumented on a checkerboard target containing photo-transistors at the checkerboard intersections. The photo-transistors are connected to a stepped voltage ladder, and conduct when they are illuminated, causing their respective output voltages to be low. When illumination is interrupted, the photo-transistors turn off, and allow the output of a voltage which is proportional to position on the checkerboard. Before the air bag is fired, all photo-transistors are illuminated, keeping all outputs low. When the air bag is fired, the expanding envelope interrupts illumination to respective photo transistors and they turn off and cause a stepped voltage output, proportional to their position on the checkerboard, but the still-illuminated photo-transistors stay on and keep their outputs low. The expanding envelope leading edge position is therefore known each time the positional voltage outputs are sampled. The electrical, thermal and distance-proportional signals are simultaneously monitored using a data acquisition system at rates up to 5000 sample words per second.
REFERENCES:
patent: 5355740 (1994-10-01), Beaudet et al.
patent: 5394326 (1995-02-01), Liu
patent: 5490069 (1996-02-01), Gioutsos et al.
patent: 5639118 (1997-06-01), Rhule et al.
"Capture Images of Fast-Moving Parts", by Steve Haywood, Test & Measurement World, Feb. 15, 1997, pp. 39-40.
"Air Bag Deployment Characteristics", by L.K. Sullivan and J.M. Kosser, NHTSA, Vehicle Research and Test Center, DOT HS 807 869, dated Feb. 1992.
"Leading Edge Deployment Speed of Production Air Bags", by M. Powell and A.K. Lund, publish by Insurance Institute for Highway Safety in Jan. 1995.
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