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US 5,629,533 AGranted
Optical sensor and method
AssigneeMotorola, Inc.
InventorsDonald E. Ackley, Thomas B. Harvey, III
Life of this patent
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Abstract
An optical sensor (10,30) uses a polymer light emitting diode (12, 31, 41, 51) to emit light detected by a polymer photodetector (13, 36, 46, 56). The polymer light emitting diode (12, 31, 41, 51) containing an indicator that reacts with an analyte and alters the light emitted by the polymer light emitting diode (12, 31, 41, 51). The change is detected by the polymer photodector (13, 36, 46, 56) and is used to detect the presence of the analyte.
Claims10
An optical sensor comprising:
- an optical substrate having a first surface and a second surface;
- a first polymer light emitting diode having a first portion and a second portion with an underlying polymer positioned therebetween, the first portion being patterned to expose a portion of the underlying polymer, the underlying polymer includes an indicator that reacts with an analyte, the second portion of the first polymer light emitting diode being positioned on the first surface of the substrate so that the first polymer light emitting diode is positioned to emit light at a wavelength through the substrate;
- and
- a first polymer photodetector positioned on the second surface of the substrate to receive the light at the wavelength emitted through the substrate from the first polymer light emitting diode.
1 more element
Dependencies are inferred from the claim text.