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US 7,623,230 B2Granted
Optical sensor calibration
AssigneeNokia Corporation
InventorNiko Santeri Porjo
Life of this patent
Estimating the term…
Abstract
An apparatus including: an optical sensor comprising an optical transmitter and an optical receiver; and a calibration system configured to change calibration of the sensor when a measurement taken at the optical receiver, while the optical transmitter is on and the apparatus is in use, passes a test.
Claims17
An apparatus comprising:
- an optical sensor comprising an optical transmitter and an optical receiver;
- a calibration system configured to calibrate the sensor when a measurement taken at the optical receiver passes a test, wherein the measurement is taken while the optical transmitter is on and the apparatus is in use and wherein the calibration system is configured to calibrate the optical sensor by:
- generating a compensation value using the measurement;
- compensating a reference measurement using the compensation value;
- and
- calibrating the optical sensor using the compensated reference value.
3 more elements
A method of automatically re-calibrating an optical sensor comprising:
- taking a measurement at an optical receiver of the optical sensor while an optical transmitter of the optical sensor is on;
- changing calibration of the optical sensor only if the taken measurement passes a test;
- generating a compensation value using the measurement;
- compensation a reusable reference measurement using the compensation value;
- and
- calibration the sensor using the compensated reference value.
3 more elements
Dependencies are inferred from the claim text.