Low noise optical probe

Details Low noise optical probe Low noise optical probe

G - Physics

01

N

G01N 21/01 (2006.01) A61B 5/024 (2006.01) H05K 1/18 (2006.01) A61B 5/14 (1990.01)

Patent

CA 2105681

An optical probe (100) which is particularly suited to reduce noise in measruements taken on an easily compressible mate- rial, such as a finger, a toe, a forehead, an earlobe, or a lip. The probe includes a base (110) having an aperture (120) which leads to a chamber (122). The base is placed adjacent a portion of the material, the chamber being placed directly adjacent any easily compressible portion of the material. A photodetector (126) is located within the chamber and does not contact the material. A light emitting diode (LED) (130) is affixed to the material, opposite the photodetector and above the chamber. The material which is supported by the aperture and therefore rests above or has intruded into the chamber is inhibited from compression since no- thing comes in contact with this portion of the material, even when the material moves. Thus, light from the LED is directed through a stabilized portion of the material, such that the optical path length through which light travels is stabilized.

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