Patent ID: 9462976
Filing Date: 2016-10-11
CPC Classification: A61B,G01B

Claim Text:
1. A method for determining whether a physiological sensor is properly positioned on a subject, the method comprising: using the physiological sensor to emit a photonic signal comprising at least one wavelength of light; receiving a light signal using the physiological sensor, wherein the light signal includes at least a contribution corresponding to ambient light; processing, using processing equipment, the light signal to obtain an ambient signal corresponding to the ambient light contribution; analyzing, using the processing equipment, the ambient signal to determine whether the ambient signal comprises a feature, wherein the feature of the ambient signal comprises a high level of the ambient signal; analyzing, using the processing equipment, the light signal to determine whether a portion of the light signal comprises a constant amplitude feature by identifying a flatness value and comparing the flatness value to a threshold; and determining, using the processing equipment, that the physiological sensor is not properly positioned when the light signal comprises the constant amplitude feature and when the ambient signal comprises the feature.