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1. BLOOD PULSATION MEASUREMENT USING LINEARLY POLARIZED LIGHT
ABSTRACT
Blood molecules are optically active molecules. They have the ability to alter the
polarization properties of light. This paper investigates the effect of blood pulsation variation on
the polarization properties of linearly polarized light. This paper presents a new noninvasive
noncontact blood pulsation measurement technique. Linearly polarized light has been allowed to
transmit through the fingertips of a person and degree of linear polarization for transmitted part
of the light has been calculated using polarized images. Experimental results show a strong
correlation between the blood pulsation rate and the measured degree of linear polarization. The
standard correlation coefficient value for the experiment with laser light source and two
polarizers in the light path is 0.9484. Similarly for dc light source the correlation coefficient
values are 0.9410 and 0.92 with two polarizers and one polarizer, respectively. Statistical
analysis of the collected data has been done to measure the accuracy of the method. It shows that
an accurate, low cost, and simple polarization-based blood pulsation measurement device can be
developed by following the experiment performed with laser light source which could offer
significant benefits to primary healthcare.