The projected beam radiance of several common ophthalmologic instruments was measured, and potential hazard to the patient from light exposure was analyzed with reference to safety standards for coherent light. The indirect ophthalmoscopes tested appear to be "safe" under moderate voltage settings, provided exposure is reasonably brief. Slit-lamp biomicroscopy of the fundus, however, merits cau...

Ronald Mahler’s Probability Hypothesis Density (PHD) provides a promising framework for the passive coherent location of targets observed via multiple bistatic radar measurements. We apply a particle filter implementation of the Bayesian PHD filter to target tracking using both range and Doppler measurements from a simple non-directional receiver that exploits non-coöperative FM radio transmitt...

This paper analysis the characteristics and ambiguity function of the single-channel and multichannel DVB-T signals, and choose the multi-channel DVB-T signal as opportunity illuminators to do the research of ISAR imaging. Firstly, the target’s echo using single-in-multi-out mode for passive ISAR image is derived, together with the analysis of the composition of the echo’s spatial spectrum. Con...

Most gaze tracking systems are based on the pupil center corneal reflection (PCCR) method using near infrared (NIR) illuminators. One advantage of the PCCR method is the high accuracy it achieves in gaze tracking because it compensates for the pupil center position based on the relative position of corneal specular reflection (SR). However, the PCCR method only works for user head movements wit...

Passive Coherent Location (PCL) is a low-cost system for tracking of air targets clandestinely using illuminators of opportunity such as FM broadcast and digital TV. Due to an increased interest in PCL systems, researchers have been working on different configurations of available sources of opportunity and receivers capable of extracting plots from reflected signals of opportunity. The configu...

Multi-static passive radar (MPR) systems typically use narrowband signals and operate under weak signal conditions, making them difficult to reliably estimate motion parameters of ground moving targets. On the other hand, the availability of multiple spatially separated illuminators of opportunity provides a means to achieve multi-static diversity and overall signal enhancement. In this paper, ...

This article serves both as survey of illuminated manuscripts the Institutiones and an analysis links between iconography criminal law model Judas hanged. investigation is based on study all digitalised Institutiones. The corpus composed ranging from fifth to fifteenth century, produced over Europe. elucidates how manuscript boomed during thirteenth with Bologna at its heart. production continu...

Finite difference time domain electromagnetic simulation of asymmetrical grating structures is used to identify promising plasmon enhanced illuminators (PEI). Such PEIs have important applications in microscopy, surface enhanced Raman scattering, and even heat-assisted magnetic recording. The design of PEIs is complicated by the need for directional coupling and low re-radiation of previously c...