In this work, the design of a low-cost, field programmable gate array (FPGA)-based digital hardware platform that implements image processing algorithms for real-time distance measurement is presented. Using embedded development kit (EDK) tools from Xilinx, the system is developed on a spartan3 / xc3s400, one of the common and low cost field programmable gate arrays from the Xilinx Spartan fami...

A simple, economic and successful design for distance and cable length detection is presented. The measurement system is based on the continuous repetition of a pulse that endlessly travels along the distance to be detected. There is a pulse repeater at both ends of the distance or cable to be measured. The endless repetition of the pulse generates a frequency that varies almost inversely with ...

Abstruct-The effects of measurement distance in distorting low sidelobe difference patterns are examined; this is a sequel to a paper on low sidelobe sum pattern effects. Previous calculations have used obsolete suboptimum aperture distributions. The Bayliss linear distribution is a versatile highly efficient and robust optimum distribution; its use here allows a single curve of sidelobe measur...

We propose simple schemes that can perfectly identify projective measurement apparatuses secretly chosen from a finite set. Entanglement is used in these schemes both to make possible the perfect identification and to improve the efficiency significantly. Based on these results, a brief discussion on the problem of how to appropriately define distance measures of measurements is also provided.

Recently, various technologies for conserving and using energy resources efficiently have been developed worldwide, among which wind energy and fuel cells have been receiving much attention as renewable energy, and LED application field has received attention in the aspect of energy usage. This study aims to build an IPC network among technologies using patent information on wind energy, fuel c...

Quantum key distribution (QKD) promises unconditional security for sharing secret keys by relying on the laws of quantum physics. Its practical implementation, however, faces some challenges. For instance, that we need to trust some of the equipment used by our legitimate users poses a threat that has partly been remedied by recently proposed measurement-device-independent QKD (MDI-QKD) schemes...

Peter de Groot Zygo Corporation Research and Development Department 21 Laurel Brook Road Middlefield, Connecticut 06455 Abstract. I describe four unusual laser systems for absolute measures of linear distance. All employ the familiar techniques of multiple wavelengths, chirped wavelength, optical feedback and intensity modulation, but in somewhat unfamiliar architectures. These examples serve t...

We propose a new fiber lens structure for large distance measurement in which a polymer layer is added to a conventional fiber lens. The proposed fiber lens can adjust the working distance by properly choosing the refractive index and thickness of the polymer layer. In our numerical analysis for the fiber lens radius of 120 μm, the working distance of the proposed fiber lens is about 10 mm whic...