Portable two linearly polarized beams absorption biometric system

Der-Chin Chen

Department of Electrical Engineering, Feng Chia University, Taichung.

DOI: 10.4236/abb.2012.31007                

Abstract

The purpose of this paper is to design a portable two linearly polarized beams absorption biometric system (PTLPBABS) that measures the amount of absorption of the visible collimated beam passing by the sample to know the absorbance of the sample. The measured object in the system is the gold colloid that the sample produces after a biochemical reaction. After measuring the absorbance of the gold colloid we can obtain the concentrations of the waiting-measured sample and further obtain the concentration of chemical solution contained in the sample. The two linearly polarized beams device can be used to enhance rejection of ambient light and causes PTLPBABS to have excellent data stability measured. The process of the double optical path method increases the opportunities that the visible collimated beam is absorbed, which raise the detection sensitivity of the system to a sensitivity of 0.1%.

Keywords

Collimated Beam; Transmitter; Receiver; Double Optical Path; Receiver

Conflicts of Interest

The authors declare no conflicts of interest.

References

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