Non-contact Function Research Articles

Simple and accurate determination of sol–gel phase transition point using disk-type electromagnetically spinning viscosity measurement system

We performed viscosity measurements with ultrahigh sensitivity by combining our original electromagnetically spinning technique and a newly developed floating disk probe. This system is, in principle, a torque-control-type viscometer with a noncontact function that can apply an arbitrary low torque, and therefore, enables us to clearly distinguish between liquids and solids from the viewpoint of the mechanical property of materials. In our measurements, we examined the difference in the thermoreversible sol–gel transition of a methylcellulose solution to determine the precise transition points, and successfully observed the hysteresis behavior of the gelation and solation processes.

Palm Vein Authentication Based on the Coset Decomposition Method

The palm vein authentication technology is extremely safe, accurate and reliable as it uses the vascular patterns contained within the body to confirm personal identification. The pattern of veins in the palm is complex and unique to each individual. Its non-contact function gives it a healthful advantage over other biometric technologies. This paper presents an algebraic method for personal authentication and identification using internal contactless palm vein images. We use MATLAB image processing toolbox to enhance the palm vein images and employ coset decomposition concept to store and identify the encoded palm vein feature vectors. Experimental evidence shows the validation and influence of the proposed approach.