Abstract: A security system for determining if a screened individual is a potential perpetrator of a crime. The following scanning devices are connected to a scanning system control computer: a physiological sign scanning device for measuring the physiological signs of the individual, an iris scanner for scanning the individual's iris, and an identification card scanner for scanning the individual's identification. The scanning system control computer is connected to a master database located on a master computer. A predetermined set of baseline normal values of physiological signs and vital signs for the general population is installed on the master database forming a general population database. Each individual who is scanned has their own personal data file created, in which their individual physiological set of norms, plus their iris scan would be attached and compared for future scans forming an individual database.

Abstract: In a method of evaluating the thermal stability of hydrocarbon liquid fuels, the fuel flows over a heated tube that causes the fuel to decompose and deposit a residue as a film on the surface of the heated tube. The thickness of that residue film is a measure of the fuel's thermal stability. To measure the film's thickness, the film is illuminated with light that is substantially monochromatic. The light reflected from the surface of the heater tube interferes with the light reflected from the overlying surface of the residue film on that tube and thereby causes variations in the intensity of the reflected light. Those variations in intensity of the reflected light are detected to obtain a measure of the thickness of the film. In one embodiment of the invention, the heated tube is situated in an enclosed housing through which the fuel is caused to flow and the thickness measurement is made while the film builds up on the heated tube.