Person-number detecting system

Details Person-number detecting system Person-number detecting system

1987-11-19

1989-07-18

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250342, G08B 1318

Patent

active

048497371

ABSTRACT:
A person-number detecting system which comprises a detector for detecting infrared rays emitted from persons' bodies to generate an output signal while a scanning optical means circularly scans a visual field of the infrared ray detector, a means for amplifying the output signal of the detector, a means for converting it to a signal necessary for detection of the number of persons located within the field, a means for discriminating the number of persons on the basis of the converted signal, and a means for outputting person number information. The system can be made simple and inexpensive, while realizing a highly precise detection of the number of persons in a wide detection zone.

REFERENCES:
patent: 3493953 (1970-02-01), Taylor
patent: 3889117 (1975-06-01), Shaw, Jr.
patent: 4636774 (1987-02-01), Galvin et al.
patent: 4769697 (1988-09-01), Gilley et al.

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