Arik Anderson;Ronald A. Widman;Oleg Gonopolskiy;Bruce J. Barrett
发明人:
Oleg Gonopolskiy,Arik Anderson,Bruce J. Barrett,Ronald A. Widman
申请号：
US12330799
公开号：
US09404961B2
申请日:
2008.12.09
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A physiological sensor includes a light source and an age detector circuit in communication with the light source. The age detector circuit is configured to determine an age of the light source based on current-voltage characteristics of said light source. In addition, a method includes measuring an initial I-V characteristic and an actual I-V characteristic of the light source, and comparing the initial I-V characteristic to the actual I-V characteristic since changes in the I-V characteristics indicate aging. Actual I-V characteristics can be compared between light sources when they age at different rates to determine light source aging. Moreover, the method may include updating the memory device with the actual I-V characteristic at predetermined times.
