Complex diffractive lens arrays for passive infrared detection systems have been designed and fabricated by laser beam writing and injection moulding. Continuous relief profiles with depths up to 20 μm were originated, characterised and replicated. 1999 Optical Society of America OCIS codes: (050.1970, 120.1880)

In most countries, radon is the dominant contributor among natural radiation sources to the radiation exposure dose of the general population. Numerous case-control studies of residential radon and lung cancer have been conducted using passive radon (Rn-222) detectors. These studies showed that radon may increase lung cancer risk, but most of them did not show a significant risk. Recently it wa...

We report on the design and laboratory testing of a prototype imaging CZT detector intended for balloon flight testing in April 2000. The detector tests several key techniques needed for the construction of large-area CZT arrays, as required for proposed hard X-ray astronomy missions. Two 10 mm × 10 mm × 5 mm CZT detectors, each with a 4 × 4 array of 1.9 mm pixels on a 2.5 mm pitch, will be mou...

We discuss the difficulties of photon-counting at extremely high rates and introduce a scheme for a photon-counting detection system that addresses these difficulties. The method uses an array of N detectors and a 1-by-N optical switch with a control circuit to direct input light to live detectors. We compare performance of our system to other, passive detection systems and show that our detect...

This project aims to demonstrate how the detection process of broadband clicks can be modeled for different marine mammal species and detectors and assess the magnitude of error on the estimated density due to various commonly used simplifying assumptions in the modeling process. Our main purposes are to quantify potential biases in the population density estimate for selected species and detec...