Reflecting wrist type heart rate meter and reflecting wrist type heart rate measuring method

A reflective, heart rate meter technology, applied in the measurement of pulse rate/heart rate, diagnostic record/measurement, medical science, etc., can solve the problems of low accuracy and complex structure of the heart rate meter, and achieve low cost, easy implementation, and reliability. high effect

Active Publication Date: 2015-02-25
湖南莱通光学科技有限公司
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Problems solved by technology

[0028] The existing heart rate meter has complex structure and low accuracy. Therefore, it is neces...

Method used

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  • Reflecting wrist type heart rate meter and reflecting wrist type heart rate measuring method
  • Reflecting wrist type heart rate meter and reflecting wrist type heart rate measuring method
  • Reflecting wrist type heart rate meter and reflecting wrist type heart rate measuring method

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Embodiment 1

[0078] The overall structure of the reflective wrist heart rate monitor is as follows: figure 1 .

[0079] (1) Hardware part

[0080] Studies have shown that in order to reduce the impact of human tissue absorption of light on the measurement structure, the wavelength should be selected so that the absorption coefficient of light intensity by blood tissue is greater than that of non-blood tissue, and the main light-absorbing substance in blood is hemoglobin (Hb) and oxygenated hemoglobin (HbO2), the concentrations of which vary with the systolic and diastolic cycles of the heart. Figure 5 It is the comparison of the absorption coefficients of Hb and HbO2 in blood. In order to ensure that the reflected light intensity changes linearly according to the incident light intensity, the wavelength with the same absorption coefficient of Hb and HbO2 should be selected as much as possible. It can be seen that it is around 805nm, but the wavelength near this point The gradient of the...

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Abstract

The invention discloses a reflecting wrist type heart rate meter. The reflecting wrist type heart rate meter comprises a microprocessor, a nixie tube, an LED flickering circuit, a light-emitting diode, a light source driving circuit, a reflected light receiving circuit, a low-pass amplifying circuit, a high-pass filtering circuit and a voltage comparison circuit. The microprocessor is an STC89C52 chip. The nixie tube is used for displaying the detected heart rate value. The reflected light receiving circuit, the low-pass amplifying circuit, the high-pass filtering circuit and the voltage comparison circuit are sequentially connected. The output end of the voltage comparison circuit is connected with an external interruption interface of the microprocessor. Each external interruption corresponds to one heartbeat. The microprocessor calculates the heart rate value based on the frequency of external interruptions within a preset T, and the heart rate value obtained by calculation is displayed on the nixie tube. Every time when one external interruption happens, the microprocessor controls an LED lamp in the LED flickering circuit to flicker one time. The reflecting wrist type heart rate meter is easy to operate and high in detection precision.

Description

technical field [0001] The invention relates to a reflective wrist heart rate meter and a reflective wrist heart rate measuring method. Background technique [0002] Heart rate, the technical term used to describe the cardiac cycle, refers to the number of times the heart beats per minute. Heart rate not only reflects the health status of the human cardiovascular system, but also reflects the intensity of human biological exercise. The monitoring of exercise center rate on exercise intensity is of great interest to the fields of sports medicine, exercise physiology, exercise training, and exercise psychology at home and abroad. question. [0003] In recent years, domestic and foreign efforts have been devoted to the development of non-contact sensors. The important feature of this type of sensor is that the measurement part does not invade the body and will not cause body trauma, and the integration of system sensors is getting higher and higher. At present, most of this k...

Claims

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Application Information

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IPC IPC(8): A61B5/024
CPCA61B5/0059A61B5/0245A61B5/6824
Inventor 刘江峰
Owner 湖南莱通光学科技有限公司
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