Patent ID: 9360365
Filing Date: 2016-06-07
CPC Classification: A61B,G01J,G01N

Claim Text:
1. An optical sensor device comprising: a light emitter configured to periodically emit light at a predetermined frequency toward a measurement target; a light receiver configured to detect at least one of reflected light and diffused light from the measurement target, and to output an electrical signal based on the detected light; a filter circuit configured to filter the electrical signal at the predetermined frequency and to output a modulation signal; an amplifier configured to amplify the modulation signal; an AD converter configured to convert the modulation signal to a digital signal; and an arithmetic processing unit coupled to the AD converter and configured to calculate a DC component of the electrical signal based on the digital signal by: wherein the arithmetic processing unit is further configured to calculate an AC component of the electrical signal by excluding the DC component from the modulation signal.