05758644 is referenced by 673 patents and cites 25 patents.

The method and apparatus of the present invention provides a system wherein light-emitting diodes (LEDs) can be tuned within a given range by selecting their operating drive current in order to obtain a precise wavelength. The present invention further provides a manner in which to calibrate and utilize an LED probe, such that the shift in wavelength for a known change in drive current is a known quantity. In general, the principle of wavelength shift for current drive changes for LEDs is utilized in order to allow better calibration and added flexibility in the use of LED sensors, particularly in applications when the precise wavelength is needed in order to obtain accurate measurements. The present invention also provides a system in which it is not necessary to know precise wavelengths of LEDs where precise wavelengths were needed in the past. Finally, the present invention provides a method and apparatus for determining the operating wavelength of a light emitting element such as a light emitting diode.

Title
Manual and automatic probe calibration
Application Number
8/478493
Publication Number
5758644
Application Date
June 7, 1995
Publication Date
June 2, 1998
Inventor
James M Lepper Jr
Trabuco Canyon
CA, US
Charles Robert Ragsdale
Newport Beach
CA, US
Massi E Kiani
Laguna Niguel
CA, US
Mohamed Kheir Diab
Mission Viejo
CA, US
Agent
Knobbe Martens Olsen & Bear
Assignee
Masimo Corporation
CA, US
IPC
A61B 5/00
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