Detector with coated lens assembly
AssigneeSuppression Technologies, Inc.
InventorRonald D. Cranford
Life of this patent
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Abstract
A spark detector lens assembly is adapted to block energy from static electric discharges. The lens assembly includes a housing which receives a lens. The lens is adapted to pass infrared frequency energy therethrough. A conductive coating is disposed on one side of said lens, which is effective to block radio frequency energy but pass infrared frequency energy. The conductive coating may be electrically connected to an electrical ground path. The lens assembly is especially effective for preventing false alarms by shielding a spark detector from radio frequency energy radiated by static electric discharges.
Claims10
A spark detector comprising:
- a duct adapted to pass a flow of flammable material therethrough;
- a spark sensor responsive to the impingement of radiation thereon;
- a lens adapted and positioned to receive infrared energy from said duct and pass said energy therethrough to said spark sensor;
- a conductive coating disposed on one side of said lens, said coating effective to block radio frequency energy but pass infrared energy therethrough;
- and
- an electrical ground path connected to said coating.
Dependencies are inferred from the claim text.