The pulse signal of human body contains a lot of physiological and pathological information, and accurate and effective extraction of pulse signal is helpful for early prevention of diseases. In the traditional pulse examination, human factors have a great influence. With the development of medical career and the progress of modern science and technology, non-invasive technology is widely used. This paper introduces the application of infrared technology to detect pulse signals, which can get pulse signals more accurately.
Firstly, this paper introduces the extraction of pulse signal from the background of the subject and the research progress at home and abroad. Then, based on the infrared detection technology, the finger is radiated by infrared light-emitting diode, and various factors affecting the extraction accuracy are analyzed. At the same time, the design scheme of eliminating various interference signals and optimizing amplification is put forward. After a series of circuit filtering, A/D conversion is obtained, and data processing and waveform display are carried out through the control of single chip microcomputer AT89C5 1. According to the requirements of pulse waveform display, the waveform display technology of dot matrix graphic display is analyzed, and finally the dot matrix liquid crystal display MG240 128 is selected to display the waveform.
Non-invasive medical technology will be the development direction of future medical projects. The study of human pulse signal in this paper is only one aspect of non-invasive technology, hoping to help the further research of modern medical equipment.