Photon intrusion detector

Details Photon intrusion detector Photon intrusion detector

2005-08-23

2005-08-23

Mullen, Thomas (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C250S221000, C250S227140, C356S450000

Reexamination Certificate

active

06933845

ABSTRACT:
An intrusion detector and method of operation which include a light source having a certain correlation length, and first and second light paths, wherein at least the first path extends through a secured area. A modulator, which is advantageously either a phase rotation modulator or path length modulator, is provided in the second path. At least one optical detector is placed to detect light traveling along the two paths. A comparator is electrically coupled to the detector to compare the detected signal with a signal applied to the modulator.

REFERENCES:
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patent: 5012088 (1991-04-01), Cole et al.
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patent: 5194847 (1993-03-01), Taylor et al.
patent: 5335208 (1994-08-01), Sansone
patent: 5349458 (1994-09-01), Karlsson
patent: 5355208 (1994-10-01), Crawford et al.
patent: 5694114 (1997-12-01), Udd
patent: 6057919 (2000-05-01), Machida et al.

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