Abstract: A pulse oximeter that improves the accuracy of blood oxygen saturation measurements by using skin moisture data (e.g., captured by a galvanic skin response or bioimpedance sensor) to account for variations in photoplethysmogram (PPG) caused by changes in the skin moisture level of the user. Additionally, in some embodiments, the pulse oximeter uses a modified Goertzel algorithm to calculate light absorption metrics (e.g., R-values) with higher accuracy and fewer computational resources than prior art devices. Additionally, in some embodiments, the pulse oximeter improves precision by calculating light absorption metrics at more frequency bands than the conventional ratio of red and infrared absorption.

Abstract: A dimensional measuring device sends a beam of light to a remote probe having a retroreflector and a pitch/yaw sensor. The pitch/yaw sensor passes the light through an aperture and a lens to a position sensor that generates an electrical signal indicative of the position of the received light. A processor uses the electrical signal to determine a pitch angle and a yaw angle of the remote probe.

Abstract: A dimensional measuring device sends a beam of light to a remote probe having a retroreflector and a pitch/yaw sensor. The pitch/yaw sensor passes the light through an aperture and a lens to a position sensor that generates an electrical signal indicative of the position of the received light. A processor uses the electrical signal to determine a pitch angle and a yaw angle of the remote probe.