Device and method for measuring orthogonal sine wave photoelectric volume pulse wave

Abstract

The invention discloses a device and method for measuring orthogonal sine wave photoelectric volume pulse wave. A microprocessor is used for outputting orthogonal sine waves of different frequencies; the orthogonal sine waves are used for driving at least four light-emitting diodes; light emitted by the light-emitting diodes is received by a photo-sensing device after passing through a tested finger; the photo-sensing device is used for converting the received light into a voltage signal; the voltage signal is converted into a preset amplitude voltage signal by using a current / voltage conversion amplifier; an analog-to-digital converter is used for converting the preset amplitude voltage signal into a digital signal; and the microprocessor is used for processing the digital signal to obtain orthogonal sine wave photoelectric volume pulse wave and a valley value and a peak value thereof and obtain a spectral value through the valley value and the peak value. The method comprises the following steps of: performing phase locking computation and separate processing on the digital signal by using the microprocessor to obtain photoelectric volume pulse wave and eliminate disturbance of background light; acquiring a valley value and a peak value according to the photoelectric volume pulse wave; and computing the valley value and the peak value to obtain an absorbency difference valueand acquiring a spectral value through the absorbency difference value. The device and the method have the characteristics of accurate measurement and simple circuit.

Description

technical field [0001] The invention relates to an orthogonal sine wave photoplethysmography measuring device and a measuring method. Background technique [0002] Photoplethysmography (Photo Plethysmo Graphy, hereinafter referred to as PPG) is an important physiological signal, widely used in the analysis of cardiovascular system and blood components. For example, the measurement of blood oxygen saturation is achieved by using two or more LEDs (light-emitting diodes) to measure PPG. In these measurements, the time-division method is usually used to collect PPG and eliminate the interference of background light. [0003] The inventor finds in the process of realizing the present invention that there are at least the following disadvantages and deficiencies in the prior art: [0004] The existing multi-wavelength PPG measurement methods have disadvantages such as complex circuit structure, high requirements for devices and processes, difficult debugging, low reliability, la...

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Problems solved by technology

[0004] Existing multi-wavelength PPG measurement methods have disadvantages such as complex circuit structure, high requirements for devices and processes, difficult debugging, low reliability, large amount of calculation, and inaccurate results.

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