Topic
Dynamic range
About: Dynamic range is a research topic. Over the lifetime, 7576 publications have been published within this topic receiving 101739 citations. The topic is also known as: DNR & DR.
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TL;DR: In this paper, it was shown that the readout noise for most arrays is limited by the MBE grown by the HAWAII-2RG material and not by the multiplexer or the data acquisition chain.
Abstract: Recently ESO has commissioned the HAWK-I camera which is equipped with a 2×2 mosaic of λc~ 2.5 µm HAWAII-2RG arrays. The arrays have high quantum efficiency and achieve photon shot noise limited performance on the telescope. Using reference pixels it can be shown that the readout noise for most arrays is limited by the MBE grown
HgCdTe material and not by the multiplexer or the data acquisition chain. Results obtained with the guide window of the
HAWAII-2RG multiplexer will be presented. Inter-channel crosstalk and fringing in the detector substrate will be
discussed. The dynamic range of detectors can be expanded by applying threshold limited integration (TLI) to the
follow-up-the-ramp nondestructive sampling scheme. For substrate removed arrays a calibration technique based on the
X-ray emission of Fe55 will be discussed.
31 citations
Patent•
29 Jun 2006
TL;DR: In this paper, an improved CMOS pixel with a combination of analog and digital readouts was used to provide a large pixel dynamic range without compromising low-light performance using a comparator to test the value of an accumulated charge at a series of exponentially increasing exposure times.
Abstract: An improved CMOS pixel with a combination of analog and digital readouts to provide a large pixel dynamic range without compromising low-light performance using a comparator to test the value of an accumulated charge at a series of exponentially increasing exposure times. The test is used to stop the integration of photocurrent once the accumulated analog voltage has reached a predetermined threshold. A one-bit output value of the test is read out of the pixel (digitally) at each of the exponentially increasing exposure periods. At the end of the integration period, the analog value stored on the integration capacitor is read out using conventional CMOS active pixel readout circuits.
31 citations
TL;DR: In this paper, a CCD array is used to detect the spatial fringes of optical interference and interesting features emerge in the output as the width of each fringe approaches the dimension of the CCD sensing cell.
Abstract: When a CCD array is used to detect the spatial fringes of optical interference, interesting features emerge in the output as the width of each fringe approaches the dimension of a CCD sensing cell. These features are theoretically studied and their application to the enhancement of the dynamic operating range of electrically scanned white-light interferometry is investigated. Preliminary experimental results are presented.
31 citations
TL;DR: In first experiments, the three-dimensional wave front of any light wave can be measured conveniently with a dynamic range and spatial resolution that exceed the performance of conventional wave front sensors of, e.g., the Shack-Hartmann type.
Abstract: Utilizing a rotatable thin birefringent crystal and two polarizers, the three-dimensional (3D) wave front of any light wave can be measured conveniently. In first experiments phase-front distortions as small as 15 mm are detected with a dynamic range of 3 mm and a spatial resolution of 50 mm. Such a dynamic range and spatial resolution exceed the performance of conventional wave front sensors of, e.g., the Shack-Hartmann type, significantly. Furthermore, the new system is rather insensitive against mechanical instabilities in opposition to interferometric and holographic techniques.
31 citations
TL;DR: In this article, a fiber optic surface plasmon resonance (SPR) sensor with a four-layer configuration is presented, which can achieve different dynamic ranges using the fourth layer which also gives toughness to the sensor configuration.
Abstract: A fibre optic surface plasmon resonance (SPR) sensor with a four-layer configuration is presented. Three-layer SPR sensors have been proposed before, but in many applications their dynamic range is not enough. Theoretical studies are carried out to achieve different dynamic ranges using the fourth layer which also gives toughness to the sensor configuration. Concentration data in different sensitivity and dynamic range situations are measured with four sensors in a fully automatized process where their operation is tested.
31 citations