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Sensors 2007, 7(12), 3366-3385; doi:10.3390/s7123366

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

1, 2 and 3,*
1 Department of Biomedical Engineering, Ming Chuan University, No. 5, Deming Rd., Gweishan Township, Taoyuan 333, Taiwan 2 Department of Optics and Photonics, National Central University, No. 300, Jung-Da Rd., Chung-Li City, Taoyuan 320, Taiwan 3 Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan
* Author to whom correspondence should be addressed.
Received: 2 November 2007 / Accepted: 18 December 2007 / Published: 19 December 2007
(This article belongs to the Special Issue Integrated High-performance Imagers)
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This paper presents a novel, non-invasive, non-contact system to measure pulsewaveforms of artery via applying laser triangulation method to detect skin surfacevibration. The proposed arterial pulsation measurement (APM) system chiefly consists of alaser diode and a low cost complementary metal-oxide semiconductor (CMOS) imagesensor. Laser triangulation and centroid method are combined with the Fast FourierTransform (FFT) in this study. The shape and frequency of the arterial pulsation can bedetected rapidly by using our APM system. The relative variation of the pulse at differentmeasurement points near wrist joint is used as a prognostic guide in traditional Chinesemedicine (TCM). An extensive series of experiments was conducted to evaluate theperformance of the designed APM system. From experimental results, the pulse amplitudeand frequency at the Chun point (related to the small intestine) of left hand showed anobvious increase after having food. In these cases, the peak to peak amplitudes and thefrequencies of arterial pulsations range from 38 to 48 μm and from 1.27 to 1.35 Hz,respectively. The height of arterial pulsations on the area near wrist joint can be estimatedwith a resolution of better than 4 μm. This research demonstrates that applying a CMOSimage sensor in designing a non-contact, portable, easy-to-use, low cost pulse measurementsystem is feasible. Also, the designed APM system is well suited for evaluating and pre-diagnosing the health of a human being in TCM clinical practice.
Keywords: Arterial pulsation; Centroid method; CMOS image sensor; Laser triangulation; Pulse frequency. Arterial pulsation; Centroid method; CMOS image sensor; Laser triangulation; Pulse frequency.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wu, J.-H.; Chang, R.-S.; Jiang, J.-A. A Novel Pulse Measurement System by Using Laser Triangulation and a CMOS Image Sensor. Sensors 2007, 7, 3366-3385.

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