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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
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Journal ArticleDOI
15 Feb 2021
TL;DR: In this article, the authors demonstrate distributed acoustic sensing (DAS) by interrogation of Rayleigh backscattering from fibers with long linearly frequency modulated pulses and coherent detection, which provides sustained real-time phase demodulation without inline amplification over a range of 148 km in standard single mode fiber and up to 171 km in low-loss OFS TeraWave SCUBA 125 fiber.
Abstract: We demonstrate distributed acoustic sensing (DAS) by interrogation of Rayleigh backscattering from fibers with long linearly frequency modulated pulses and coherent detection This system provides sustained real-time phase demodulation without inline amplification over a range of 148 km in standard single mode fiber and up to 171 km in low-loss OFS TeraWave SCUBA 125 fiber This is the longest reported range for DAS measurements The optical dynamic range of the recording is 57 dB With a 10 km fiber, we obtain a record-low interrogation noise above 50 Hz (rms average over position) of 134 and 89 µrad/√Hz with gauge lengths (equal to spatial resolution) of 10 and 34 m, respectively A total harmonic distortion of −42 dB (rms average over position) is demonstrated with a gauge length of 10 m

39 citations

Journal ArticleDOI
TL;DR: In this paper, an optical imager based on single photon avalanche diodes is reported, where the architecture of the imager is reduced to a minimum since no A/D converter is required.
Abstract: An optical imager is reported based on single photon avalanche diodes. The imager, fabricated in 0.8 μm CMOS technology, consists of an array of 1024 pixels each with an area of 58 μm × 58 μm for a total chip area of 2.5 mm × 2.8 mm. The architecture of the imager is reduced to a minimum since no A/D converter is required. Moreover, since the output of each pixel is digital, complex read-out circuitry, amplifiers, sample and hold, and other analog processing circuits are also not necessary. The maximum measured dynamic range is 120 dB and the minimum noise equivalent intensity is 1.3 mlx. The minimum integration time per pixel is 4 μs while optical and electrical crosstalk are negligible without the need for any post-processing or other non-standard techniques.

39 citations

Patent
27 Oct 1987
TL;DR: In this paper, a silicon photo-diode array is used to control a spatially varying AC voltage across a liquid crystal light valve, which can be used in a storage mode by erasing with AC voltage and writing with a constant voltage.
Abstract: In contrast to existing light addressed light valves for projection displays which use a homogeneous CdS or Se photoconductive layer as the control element for a liquid crystal cell, a silicon photo-diode array is disclosed which makes an effective control element capable of applying a spatially varying AC voltage across a liquid crystal light valve. Writing may be done with a miniature CRT in an optical or electron excitation mode. It is shown that for a video mode the ratio of diode capacitance to liquid crystal cell capacitance associated with the diode, and the frequency of the applied square wave voltage, define the buildup or decay time of the liquid crystal cell voltage. Thus, the frequency of the applied AC voltage can be used to control sensitivity and transient response and there is no lag. The dynamic range of the cell voltage is shown to depend on the ratio of diode capacitance to liquid crystal cell capacitance. The display can be used in a storage mode by erasing with an AC voltage and writing with a constant voltage. The silicon photodiode array is compatible with a CCD frame store using direct minority carrer injection for writing. This light addressed version thus represents a desirable milestone in achieving an all solid-state projection display.

39 citations

Journal ArticleDOI
TL;DR: In this article, a bound for shot and intensity noise is derived and compared to previously reported measurements. And for an ideal modulator transfer function (Class B), a substantial improvement in shot-noise limited spur-free dynamic range (e.g., 11.7 dB at 10% modulation) can be realized.
Abstract: Class-AB techniques are analyzed as a means to minimize the noise associated with the residual carrier in analog optical links. A bound for shot and intensity noise is derived and compared to previously reported measurements. It is found that for an ideal modulator transfer function (Class B), a substantial improvement in shot-noise limited spur-free dynamic range (e.g., 11.7 dB at 10% modulation) can be realized.

39 citations

Journal ArticleDOI
TL;DR: This paper addresses the problem of phase information loss in HDR scenes, in order to enable 3D reconstruction from saturated or dark images by deep learning by using a specifically designed convolutional neural network (CNN), which can accurately extract phase information in both the low signal-to-noise ratio (SNR) and saturation situations after proper training.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023176
2022383
2021189
2020265
2019325
2018334