To make the measurement device is much compact and portable, a photoelectric probe is designed and the light source and collection system are integrated together. The light path differences between the two wavelengths are considered and the photoelectric probe can measure within a shorter distance.

The circuit differences of the two detection modules are simplified to the response time delay interval. An amplitude spectrum and phase spectrum adaptive filter is designed to compensate the motion artifacts, considering the differences in the circuit character.

Comparing with time-domain adaptive filter and ICA, the amplitude spectrum and phase spectrum adaptive filter improves the measurement accuracy and expands the application range.

The effect of motion artifact on the signal received by the photodiode is analyzed in detail. Through the analysis, we know the pulse signal and motion signal are additive.