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.
Papers published on a yearly basis
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TL;DR: It is shown that the z(-2)dependence from the lidar equation can be converted to almost constant signal amplitude for distances up to 3 km by suitable and realistic choice of the geometric parameters.
Abstract: The dynamic range of lidar return signals has been calculated for coaxial transmitter–receiver geometries via the spatial distribution of irradiance in the detector plane as a function of distance z. It is shown that the z−2 dependence from the lidar equation can be converted to almost constant signal amplitude for distances up to 3 km by suitable and realistic choice of the geometric parameters. On the other hand, no signal degradation with respect to the lidar equation occurs at large distances. This geometrical compression of lidar return signal amplitudes is rated superior to electronic compression methods such as gain switching or logarithmic amplification.
51 citations
Patent•
07 Oct 1999
TL;DR: In this paper, the integration time of each pixel is controlled as a function of light intensity received by each individual pixel, by resetting the pixel after a predetermined threshold for the output signal, has been reached.
Abstract: Method and apparatus for expanding the dynamic range of an optical imager, comprising individually controlling the integration time of each pixel of a sensor array, and providing a corresponding scaling factor for the electrical output of each individual pixel during the frame time. The integration time of each pixel is controlled as a function of light intensity received by each individual pixel, by resetting the pixel after a predetermined threshold for the output signal, has been reached.
51 citations
Patent•
11 Nov 2003TL;DR: In this article, a DAC system and a mode selector are used to select a mode of operation for the digital-to-analog converter system from a plurality of modes associated with an instantaneous dynamic range and quantization noise level of the DAC system.
Abstract: A conversion system converts an input signal from a digital signal to an analog signal over an extended dynamic range. The system includes a DAC system and a mode selector. The mode selector selects a mode of operation for the digital-to-analog converter system from a plurality of modes. The mode selector selects a mode according to a characteristic of the input signal. Each of the modes is associated with an instantaneous dynamic range and quantization noise level of the DAC system. The ensemble of modes provides an improvement in total or effective dynamic range compared to any single DAC component within the DAC system.
51 citations
TL;DR: The promising results support future applications of smart 3D-printed systems with embedded sensory elements being used for dynamic measurements in areas where currently piezo-crystal-based sensors are used.
Abstract: 3D-printing technology is opening up new possibilities for the co-printing of sensory elements. While quasi-static research has shown promise, the dynamic performance has yet to be researched. This study researched smart 3D structures with embedded and printed sensory elements. The embedded strain sensor was based on the conductive PLA (Polylactic Acid) material. The research was focused on dynamic measurements of the strain and considered the theoretical background of the piezoresistivity of conductive PLA materials, the temperature effects, the nonlinearities, the dynamic range, the electromagnetic sensitivity and the frequency range. A quasi-static calibration used in the dynamic measurements was proposed. It was shown that the temperature effects were negligible, the sensory element was linear as long as the structure had a linear response, the dynamic range started at ∼ 30 μ ϵ and broadband performance was in the range of few kHz (depending on the size of the printed sensor). The promising results support future applications of smart 3D-printed systems with embedded sensory elements being used for dynamic measurements in areas where currently piezo-crystal-based sensors are used.
51 citations
02 Nov 1991
TL;DR: In this article, a high-energy X-ray computed tomography system with an electron linear accelerator was developed to image cross-sections of large-scale and high-density materials.
Abstract: A high-energy X-ray computed tomography system with an electron linear accelerator was developed to image cross-sections of large-scale and high-density materials. An electron linear accelerator is used for the X-ray source. The maximum X-ray energy is 12 MeV and the average energy is around 4 MeV. The intensity of an X-ray fan beam passing through the test object is measured by a 15-channel detector array. CWO (CdWO/sub 4/) scintillators and photodiodes are employed for the X-ray detectors. The crosstalk noise due to scattering at X-ray photons by adjacent detectors is reduced to less than 1.6% by installing a tungsten shield between the scintillators. Extra channels are used to compensate for the baseline shift of the circuits. These techniques allowed attainment of a dynamic range of more than 85 dB and a noise level comparable to the signal amplitude of X-ray transmitted in a 420 mm-thick iron block. A spatial resolution of 0.8 mm was confirmed with an iron test piece 200 mm in diameter. >
50 citations