Triangular wave modulation photoelectric plethysmography measurement device and method capable of raising electrical level

A technology of photoplethysmography and measuring devices, which is applied in diagnostic recording/measurement, medical science, diagnostic signal processing, etc., can solve the problems of low signal-to-noise ratio of digital signals and affect signal measurement accuracy, so as to improve signal-to-noise ratio and improve The effect of precision

Inactive Publication Date: 2017-02-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, when a pure triangular wave is used as the excitation signal, the signal-to-noise ratio of the digital si

Method used

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  • Triangular wave modulation photoelectric plethysmography measurement device and method capable of raising electrical level
  • Triangular wave modulation photoelectric plethysmography measurement device and method capable of raising electrical level
  • Triangular wave modulation photoelectric plethysmography measurement device and method capable of raising electrical level

Examples

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Effect test

Embodiment 1

[0046] A triangular wave modulated photoplethysmography measurement device with elevated levels, see figure 1 and figure 2 , the triangular wave modulated photoplethysmography measuring device with raised level comprises: a microprocessor 1, at least four kinds of light emitting diodes 2, a photosensitive device 3, a current / voltage conversion amplifier 4 and an analog-to-digital converter 5,

[0047] Microprocessor 1 outputs triangular waves with different frequencies and a ratio of 2 times of raised preset levels, and the raised triangular waves of preset levels drive at least 4 kinds of light-emitting diodes 2, and the light emitted by light-emitting diodes 2 passes through the finger under test. Received by the photosensitive device 3, the photosensitive device 3 converts it into a voltage signal, and the voltage signal is converted into a preset amplitude voltage signal by the current / voltage conversion amplifier 4.

[0048] After the embodiment of the present invention...

Embodiment 2

[0064] A triangular wave modulated photoplethysmography measurement device with elevated levels, see image 3 , the measuring device has adopted four kinds of light-emitting diodes 2, and the four I / O ports PX.1, PX.2, PX.3 and PX.4 of the microprocessor 1 respectively pass through the first resistor R1, the second resistor R2, The third resistor R3 and the fourth resistor R4 drive the first light emitting diode D1, the second light emitting diode D2, the third light emitting diode D3 and the fourth light emitting diode D4, the first light emitting diode D1, the second light emitting diode D2, the third light emitting diode The light transmitted by D3 and the fourth light-emitting diode D4 is received by the photosensitive sensor 3, and the signal received by the photosensitive sensor 3 passes through the operational amplifier A1, the first capacitor C1, the second capacitor C2 and the fifth resistor R5. The current / voltage conversion amplifier 4 composed of the sixth resistor...

Embodiment 3

[0068] A kind of triangular wave modulation photoplethysmography measurement method with raised level, see Figure 4 , the method includes the following steps:

[0069] 101: The microprocessor 1 drives at least four kinds of light-emitting diodes 2 by using triangular waves with different frequencies and a ratio of 2 times to increase the preset level;

[0070] 102: The light emitted by the light-emitting diode 2 passes through the finger under test and is received and converted into a voltage signal by the photosensitive device 3, and the voltage signal is amplified into a preset amplitude voltage signal by the current / voltage conversion amplifier 4;

[0071] 103: The preset amplitude voltage signal is converted into a digital signal by the analog-to-digital converter 5 and sent to the microprocessor 1;

[0072] 104: The microprocessor 1 performs phase-locking calculation and separation processing on the digital signal to obtain the photoplethysmography wave and eliminate th...

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Abstract

The invention discloses a triangular wave modulation photoelectric plethysmography measurement device and method capable of raising an electrical level. A micro processor outputs triangular waves which have different frequencies and raise a preset electrical level in a twice-proportion relation to drive at least four light emitting diodes; light emitted by the light emitting diodes is received by a photosensor after passing through a measured finger; the photosensor converts the light into a voltage signal; the voltage signal is converted into a preset amplitude voltage signal through a current/voltage conversion amplifier; the micro processor processes a digital signal to acquire photoelectric plethysmography as well as a valley value and a peak value thereof so as to obtain a spectral value; in a process that the photosensor acquires a photoelectric signal, the noise level is not changed, but the preset electrical level of a triangular wave signal serving as a driver is raised, so that the low electrical level part of the triangular wave signal is obviously improved when the triangular wave signal is compared with noise; therefore, the signal-to-noise ratio of a photoelectric signal acquired by the photosensor at the low electrical level part of the triangular wave signal is increased, and the precision of the digital signal input into a computer is improved.

Description

technical field [0001] The invention relates to the field of photoplethysmography measurement, in particular to a measurement device and method for triangular wave modulation photoplethysmography with elevated levels. 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] Existing measurement methods that use sine waves or square waves to excite multi-wavelength PPG have disadvan...

Claims

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Application Information

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IPC IPC(8): A61B5/02
CPCA61B5/02A61B5/72A61B5/7203
Inventor 李刚宋韶秀林凌
Owner TIANJIN UNIV
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