Wrist strap type infrared pulse measurement method

A wristband-type, infrared technology, which is applied in the measurement of pulse rate/heart rate, etc., can solve the problems of cumbersome methods, incapable of active pulse measurement, incapable of accurate measurement at the wrist, etc., to solve the problems of large deviation of results, simplification of analog circuits, and measurement The effect of simple steps

Inactive Publication Date: 2014-06-18
北京格瑞图科技有限公司
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Problems solved by technology

[0004] Aiming at the problem that the existing method of measuring the pulse of the finger cannot accurately measure the wrist, and the method of measuring the pulse of the finger is cumbersome, the user's pulse cannot be activ...

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  • Wrist strap type infrared pulse measurement method
  • Wrist strap type infrared pulse measurement method
  • Wrist strap type infrared pulse measurement method

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Embodiment Construction

[0022] The preferred embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] see figure 1 , the signal amplification and filtering circuit (2) performs front-end amplification and filtering on the output signal of the infrared triode in the infrared measurement pulse circuit (1). Signal amplification and filtering circuits such as figure 2 As shown in the figure, C1 and C2 have the function of blocking DC and AC, so that the post-stage amplifier only amplifies the AC signal. AMP1 and AMP2 form an amplifying and filtering circuit, and the effective pulse wave signal period is between 0.33 and 3.3 S. Among them, C3 and C4 have a high-frequency filtering function, which can couple high-frequency noise from other parts of the circuit board and muscle jitter caused by the tester. The burst interference caused by it is filtered out. The amplification relationship of the AMP1 circuit to the effective p...

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Abstract

The invention provides a wrist strap type infrared pulse measurement method, relates to the field of pulse measurement, in particular to wrist pulse wave measurement utilizing infrared reflection technologies and aims at solving the problem that by adopting an existing measurement mode, measurement at the wrist position with a few blood vessels is inaccurate and the user body condition cannot be actively monitored in real time during finger pulse measurement. The wrist strap type infrared pulse measurement method comprises the steps of transmitting measured wrist position weak pulse wave signals to a pulse wave signal extracting circuit and an analog-digital converter, then performing characteristic quantity extraction and matched filtering on the digital pulse wave signals through a signal processing unit to obtain effective pulse wave signals, and performing statistical average on the pulse wave signals meeting the relevance requirement to obtain the pulse times of a measured person. The problem that the result deviation is large after the weak pulse wave signals are counted in an existing measurement mode is effectively solved, and a pulse measurement device designed by adopting the wrist strap type infrared pulse measurement method can be worn at the wrist position and perform real-time active monitoring on a user body state.

Description

technical field [0001] The invention relates to the field of pulse measurement, in particular to a method for measuring the pulse of a wrist using infrared reflection technology. Background technique [0002] The infrared pulse measurement method is a photoplethysmography method in the infrared light band. Oxygenated hemoglobin (HbO2) and unoxygenated hemoglobin (Hb) in human blood have different absorption coefficients for different wavelengths of light. In the vicinity of infrared light, the absorption coefficient change curves of Hb and HbO2 are relatively flat, and are less affected by the error of the diode light-emitting wavelength, so infrared light is more suitable for pulse measurement. When infrared light shines on the skin surface, part of the light is reflected to the infrared sensor. Since the absorption of light by skin and muscle tissue is basically unchanged in the blood circulation, and the blood volume fluctuates under the action of the heart, the periphe...

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Application Information

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IPC IPC(8): A61B5/024
Inventor 陈永金李征李晶
Owner 北京格瑞图科技有限公司
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