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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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Proceedings ArticleDOI
23 May 2004
TL;DR: A second generation 80/spl times/60 pixels arbitrated address-event imager has been designed and fabricated in a 0.6 /spl mu/m CMOS process and its pixel has been improved for image quality, power consumption and dynamic range.
Abstract: A second generation 80/spl times/60 pixels arbitrated address-event imager has been designed and fabricated in a 0.6 /spl mu/m CMOS process. Its pixel has been improved for image quality, power consumption and dynamic range. The improved pixel dynamic range is 203 dB. The array has a dynamic range of 119 dB. The power consumption is 1.7 mW in uniform indoor light and a mean event rate of 142 K events/s (2.8 K effective fps). The imager is capable of updating its images 10.4 K times/s.

28 citations

Patent
08 Aug 1985
TL;DR: In this article, a black body signal source, fiber optic signal coupling, and extension of the transducer dynamic range with optical multiplexing are employed; the instrument operates in the range of 1.6 micrometers of optical energy wavelength.
Abstract: Fiber optic probe apparatus usable for measuring temperatures with increased dynamic range and frequency domain response and desirable measurement accuracy. A black body signal source, fiber optic signal coupling, and extension of the transducer dynamic range with optical multiplexing are employed; the instrument operates in the range of 1.6 micrometers of optical energy wavelength and preferably employs recently improved indium gallium arsenide photodiode transducer devices and transducer frequency domain compensation. Use of the instrument in measuring combustion flame transient temperatures is disclosed.

28 citations

Proceedings ArticleDOI
21 May 2006
TL;DR: A CMOS image sensor with nonlinear analog-to-digital converter (ADC) which performs analog gamma correction and the test results show the improved image quality than digital gamma correction.
Abstract: A human eye has the logarithmic response over wide range of light intensity. Although the gain can be set high to identify details in darker area on the image, this results in saturation in brighter area. The gamma correction is essential to fit the human eye. However, the digital gamma correction degrades image quality especially for darker area on the image due to the limited ADC resolution and the dynamic range. This paper proposes a CMOS image sensor (CIS) with nonlinear analog-to-digital converter (ADC) which performs analog gamma correction. The CIS with the proposed nonlinear ADC conversion scheme was fabricated with a 0.35-/spl mu/m CMOS process. The test results show the improved image quality than digital gamma correction.

28 citations

Journal ArticleDOI
TL;DR: In this paper, a biphase Legendre sequence with 6211 pulses was used in conjunction with polarization diversity scheme and a PM fiber for dynamic strain sensing with very low probability of fading.
Abstract: Rayleigh scattering-based dynamic strain sensing with high spatial resolution, fast update rate, and high sensitivity is highly desired for applications such as structural health monitoring and shape sensing. A key issue in dynamic strain sensing is the tradeoff between spatial resolution and the Signal-to-Noise Ratio (SNR). This tradeoff can be greatly relaxed with the use of coding. A sequence of optical pulses is injected into the fiber and the detected backscattered signal is cross correlated with the original signal. With the use of coding, SNR is indeed improved, but if the sequence is not well chosen, the resulting Peak to Sidelobe Ratio (PSR) can be rather low. An excellent choice of codes are biphase Legendre sequences which offer near Perfect Periodic Autocorrelation (PPA). Other common issues in Rayleigh scattering-based sensing techniques are signal fading and dynamic range. The former issue can occur due to destructive interference between lightwaves that are scattered from the same spatial resolution cell and, in coherent detection schemes, when the polarization states of the backscattered light and the reference light are mismatched. The latter issue is a concern in phase sensitive schemes which require signal jumps not to exceed $2\pi$ . In this paper, a biphase Legendre sequence with 6211 pulses is used in conjunction with polarization diversity scheme and a PM fiber. The setup provides two independent measurements of the sensing fiber complex profile and achieves highly sensitive, distributed dynamic strain sensing with very low probability of fading. In addition, the system can handle both very large perturbation signals and very small perturbation signals. The system operated at a scan rate of $\sim$ 107 kHz and achieved spatial resolution of $\sim$ 10 cm and sensitivity of $\sim 1.1\text{mrad}/\sqrt{\text{Hz}}$ . The ratio between the powers of the maximum and minimum excitations that can be measured by the system is 136 dB.

28 citations

Proceedings ArticleDOI
TL;DR: A version of the new fMux readout includes features such as low power consumption and radiation-hard components making it viable for future space-based millimeter telescopes such as the LiteBIRD satellite.
Abstract: Frequency domain multiplexing (fMux) is an established technique for the readout of transition-edge sensor (TES) bolometers in millimeter-wavelength astrophysical instrumentation. In fMux, the signals from multiple detectors are read out on a single pair of wires reducing the total cryogenic thermal loading as well as the cold component complexity and cost of a system. The current digital fMux system, in use by POLARBEAR, EBEX, and the South Pole Telescope, is limited to a multiplexing factor of 16 by the dynamic range of the Superconducting Quantum Interference Device pre-amplifier and the total system bandwidth. Increased multiplexing is key for the next generation of large format TES cameras, such as SPT-3G and POLARBEAR2, which plan to have on the of order 15,000 detectors. Here, we present the next generation fMux readout, focusing on the warm electronics. In this system, the multiplexing factor increases to 64 channels per module (2 wires) while maintaining low noise levels and detector stability. This is achieved by increasing the system bandwidth, reducing the dynamic range requirements though active feedback, and digital synthesis of voltage biases with a novel polyphase filter algorithm. In addition, a version of the new fMux readout includes features such as low power consumption and radiation-hard components making it viable for future space-based millimeter telescopes such as the LiteBIRD satellite.

28 citations


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