Apparatus and method employing an optical fiber for...

Details Apparatus and method employing an optical fiber for... Apparatus and method employing an optical fiber for...

2006-04-25

2006-04-25

Vu, Phuong T. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C250S227110

Reexamination Certificate

active

07035068

ABSTRACT:
An apparatus detects arcing faults at a first wavelength. A light source provides modulated light at a second different wavelength and a first frequency. An optical fiber receives the modulated light and gathers ambient light at both wavelengths. A splitter receives and splits the received light into first and second beams. A first filter extracts from the first beam a first filtered beam including the first wavelength. A first photodetector generates a first electrical signal from the first filtered beam. A second filter extracts from the second beam a second filtered beam excluding the first wavelength. A second photodetector generates a second electrical signal from the second filtered beam. A low pass filter extracts from the second electrical signal a third electrical signal representative of light at the second wavelength excluding the modulated light. A comparator generates an arcing signal when the first electrical signal exceeds the third electrical signal.

REFERENCES:
patent: 4702553 (1987-10-01), Buchmuller et al.
patent: 5650902 (1997-07-01), Herkenrath et al.
patent: 5910872 (1999-06-01), Marmonier et al.
patent: 5940547 (1999-08-01), Schumacher et al.
patent: 6229680 (2001-05-01), Shea
patent: 6236548 (2001-05-01), Marmonier
patent: 6433976 (2002-08-01), Phillips
patent: 6633009 (2003-10-01), Shea
patent: 6657150 (2003-12-01), Shea et al.
patent: 196 01 639 (1997-07-01), None
Linear Technology Corporation, “Design Notes—100 MHz Op Amp Features Low Noise Rail-to-Rail Performance While Consuming Only 2.5 mA”, Nov. 2003, 2 pp.

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