FELICE LOSTRACCO
Radio and Television Technicians in Worcester, MA
License number
Massachusetts 8533
Expiration Date
Dec 31, 2006
Type
Master Technician
Address
Address
Worcester, MA 01604
Personal information
See more information about FELICE LOSTRACCO at radaris.comName
Address
Phone
59 Alvarado Ave #1, Worcester, MA 01604
13 Acton St, Worcester, MA 01604
13 Acton St, Worcester, MA 01604
Professional information
See more information about FELICE LOSTRACCO at trustoria.com
Photoelectric Smoke Detector With Adjustable Background Signal
Photoelectric Smoke Detector With Adjustable Background Signal
US Patent:
4616928, Oct 14, 1986
Filed:
Jun 20, 1984
Appl. No.:
6/622769
Inventors:
George E. Leavitt - Ashland MA
Felice LoStracco - Worcester MA
Felice LoStracco - Worcester MA
Assignee:
Kidde, Inc. - Saddle Brook NJ
International Classification:
G01N 2153
US Classification:
356338
Abstract:
A photoelectric smoke detector including a housing defining a test zone and an opening for admitting smoke thereinto, a light source arranged to direct light to the zone and a light responsive element arranged to receive light scattered by smoke particles in the zone. An optical barrier prevents the direct transmission of light through the zone and between the light source and light responsive element, the barrier defining a light passage for transmitting light directly therebetween. Projecting into the light passage is a mechanical gate that can be adjusted to alter the size of the light passage and thereby vary the level of light transmitted directly therethrough between the light source and the light responsive element. In response to selective adjustment of the mechanical gate, the light responsive element can provide a background signal that obviates normal electronic noise.