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A Novel Pulse Measurement System by Using Laser Triangulation and a CMOS Image Sensor.

Jih-Huah Wu1, Rong-Seng Chang2, Joe-Air Jiang3

  • 1Department of Biomedical Engineering, Ming Chuan University, No. 5, Deming Rd., Gweishan Township, Taoyuan 333, Taiwan.

Sensors (Basel, Switzerland)
|September 15, 2017
PubMed
Summary
This summary is machine-generated.

A new non-contact system uses laser triangulation to measure arterial pulse waveforms via skin vibrations. This method offers a low-cost, portable approach for health assessment in Traditional Chinese Medicine.

Keywords:
Arterial pulsationCMOS image sensorCentroid methodLaser triangulationPulse frequency.

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Area of Science:

  • Biomedical Engineering
  • Medical Diagnostics
  • Optical Measurement

Background:

  • Traditional Chinese Medicine (TCM) utilizes pulse diagnosis for health assessment.
  • Existing pulse measurement methods can be invasive or lack portability.
  • Objective quantification of pulse waveforms is needed for TCM applications.

Purpose of the Study:

  • To develop a novel, non-invasive, non-contact system for measuring arterial pulse waveforms.
  • To assess the feasibility of using laser triangulation and CMOS imaging for pulse detection.
  • To evaluate the system's potential for TCM health prognostics.

Main Methods:

  • Utilized a laser diode and a CMOS image sensor for detecting skin surface vibrations.
  • Employed laser triangulation and the centroid method combined with Fast Fourier Transform (FFT).
  • Measured pulse amplitude and frequency at specific points near the wrist.

Main Results:

  • The system successfully detected pulse shape and frequency rapidly.
  • Observed significant increases in pulse amplitude and frequency after food intake at the Chun point.
  • Achieved a resolution better than 4 μm for arterial pulsation height measurement.
  • Reported peak-to-peak amplitudes ranging from 38 to 48 μm and frequencies from 1.27 to 1.35 Hz.

Conclusions:

  • A non-contact, portable, and low-cost pulse measurement system using a CMOS image sensor is feasible.
  • The developed system is suitable for evaluating and pre-diagnosing human health in TCM clinical practice.
  • This technology offers a new avenue for objective pulse diagnosis in TCM.