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A sine wave modulated photoplethysmography measuring device and measuring method

A photoplethysmography, sine wave modulation technology, applied in diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of inaccurate results, low reliability, large amount of calculation, etc. Effects without debugging

Active Publication Date: 2011-11-30
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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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.

Method used

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  • A sine wave modulated photoplethysmography measuring device and measuring method
  • A sine wave modulated photoplethysmography measuring device and measuring method
  • A sine wave modulated photoplethysmography measuring device and measuring method

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] Due to the pulsation phenomenon of the artery, the blood flow in the blood vessel changes periodically, and the blood is a highly opaque liquid, so the change of the pulse will inevitably cause the change of the absorbance, such as figure 1 shown.

[0049] Considering the lowest state of arterial vascular filling, the incident light from the light source is not absorbed by the pulsating arterial blood, and the outgoing light intensity I max The strongest, can be regarded as the incident light I of pulsating arterial blood; and the state of the highest arterial blood vessel filling corresponds to the valley point of the photoelectric pulse wave, that is, the moment when the pulsating arterial blood has the greatest effect, and th...

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Abstract

The invention discloses a sine-wave modulation photo plethysmo graphy measuring device and method. A microprocessor is used for outputting sine waves which are at different frequencies and are in a twifold rate relation; the sine waves are used for driving at least four light-emitting diodes; light emitted by the light-emitting diodes is received by a light-sensitive device after passing through a tested finger; the light-sensitive 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; the microprocessor is used for processing the digital signal to obtain photo plethysmo graphy and a valley value and a peak value of the photo plethysmo graphy; and a spectrum value is obtained according to the valley value and the peak value. The method comprises the following steps of: performing phase locking computation and separation processing on the digital signal to obtain photo plethysmo graphy and eliminating the interference of background light by using the microprocessor; acquiring the valley value and the peak value according to the photo plethysmo graphy; and computing the valley value and the peak value to obtain an absorbency difference value and obtaining a spectrum value according to the absorbency difference value. A circuit is simple, and the digital signal is concise.

Description

technical field [0001] The invention relates to a sine wave modulated 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, larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/02A61B5/1455
Inventor 李刚周梅郝丽玲刘近贞林凌
Owner TIANJIN UNIV
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