Design of Reflective Infrared Heart Rate Detector Based on uPSD3234

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Overview:
This paper presents a design scheme of a reflective infrared heart rate detector based on uPSD3234. The program uses the single-chip uPSD3234 as the core component of the system, and uses the digital signal processing method such as matching filtering to obtain the heart rate data. The microelectronic technology and the biomedical engineering technology are closely combined to meet the requirements of the scheme design and realize the heart rate of the human body. measuring.

0 Introduction Pulse waves originate from the heart beat and travel from the heart to the peripheral arteries. Its comprehensive information on morphology, intensity, rate and rhythm largely reflects the blood characteristics of many physiological and pathological processes in the human cardiovascular system. Heart rate is an important physiological indicator. It refers to the number of heart beats per unit time and is a physiological indicator for clinical routine diagnosis.
In order to measure heart rate signals, there are many techniques that can be applied, such as blood measurement, heart sound measurement, ECG measurement, and the like. In this paper, we use the high opacity of blood and the great difference between tissue and blood translucency. The pulse signal is obtained by photoelectric pulse sensor. After analog-to-digital conversion (A/D), the sampled data is digitally analyzed and processed to achieve Measurement of the human heart rate.

1 heart rate detector system structure and working principle The main components of the heart rate detector are shown in Figure 1. The pulse signal is collected by the photoelectric sensor, and the data of the pulse signal is sampled by the A/D conversion module provided by the preamplifier, filtering, and the single chip of the uPSD3234A, and stored in the memory; the single chip performs digital signal processing on the obtained data and calculates the heart rate value. The result is sent to the display module and memory.