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.

Truly Distributed Fiber Vibration Sensor Using Pulse Base BOTDA With Wide Dynamic Range

Abstract: We report on what we believe to be the first truly distributed fiber vibration sensor based on pulse base Brillouin optical time-domain analysis (BOTDA). The pulse base approach is used to realize one-end one-laser simplification of the BOTDA system, in which the modulated pulse creates the probe wave and interacts with the pulse pump. Short pulse ( 10 ns) is used to enhance the dynamic range for the sensed object. A signal acquisition system with a 1-GHz sampling rate and 2-kHz trigger rate is employed to measure the truly distributed vibrations along the sensing fiber. With 6.25-ns pulsewidth, 160-MHz dynamic range is verified and different vibrations with 0-, 1.4-, and 2.4-Hz frequency components are distinguished in a 168-m sensing range. The experimental results demonstrate that this proposed sensor may be applicable for distributed dynamic measurements of large structural components.

Adaptive digital receiver

Abstract: The present invention provides a high-performance adaptive digital receiver with adaptive background control that optimizes the performance in rapidly changing signal environments and provides 3.6 GH; instantaneous bandwidth, SFDR>90 dB, SNR=66 dB, with dynamic digital channelization. The receiver takes advantage of several levels of adaptivity that conventional approaches do not offer. In addition to a dynamic digital channelizer that is adaptively tuned based on detected signals, the present invention employs a powerful software reconfigurable digitizer that is adaptively optimized for the current signal environment to control important receiver parameters such as bandwidth, dynamic range, resolution, and sensitivity.

High-resolution, large dynamic range fiber-optic thermometer with cascaded Fabry-Perot cavities.

Abstract: The paradox between a large dynamic range and a high resolution commonly exists in nearly all kinds of sensors Here, we propose a fiber-optic thermometer based on dual Fabry–Perot interferometers (FPIs) made from the same material (silicon), but with different cavity lengths, which enables unambiguous recognition of the dense fringes associated with the thick FPI over the free-spectral range determined by the thin FPI Therefore, the sensor combines the large dynamic range of the thin FPI and the high resolution of the thick FPI To verify this new concept, a sensor with one 200 μm thick silicon FPI cascaded by another 10 μm thick silicon FPI was fabricated A temperature range of −50°C to 130°C and a resolution of 68×10−3°C were demonstrated using a simple average wavelength tracking demodulation Compared to a sensor with only the thick silicon FPI, the dynamic range of the hybrid sensor was more than 10 times larger Compared to a sensor with only the thin silicon FPI, the resolution of the hybrid sensor was more than 18 times higher

High dynamic range apparatus for separation and detection of polynucleotide fragments

Abstract: A high dynamic range apparatus for separation and detection of polynucleotide fragments has a housing adapted to receive an electrophoresis gel holder containing an electrophoresis gel loaded with fluorophore-labeled samples; one or more laser diodes for providing radiation of a frequency suitable for excitation of the fluorophore which irradiates an array of excitation/detection sites on the electrophoresis gel; an array of detectors aligned with the excitation/detection sites for collecting fluorescent emissions; and one or more components for increasing the dynamic range of the instrument by at least an order of magnitude. These components, which can be used individually or in combination include detectors that are connected to a signal processing system that modulates the period of signal integration employed so that large signals are totaled at short time intervals and smaller signals are totaled at longer time intervals; the use of a beam splitter to produce a high intensity beam of emitted light and a low intensity beam of emitted light from each excitation/detection site; and a device for modulating the intensity of the excitation beam can be used to improve the dynamic range of the instrument.

Dynamic range expanding apparatus of a video image

Abstract: The present invention relates to a dynamic range expanding apparatus. The dynamic range expanding apparatus realizes a wide dynamic range for a video image while reducing the quantization noise, by determining the brightness transform function based on the combined results of the differential and the integral operation with respect to a brightness distribution function. Moreover, the dynamic range expanding apparatus transforms the color difference signal by using the brightness transform ratio without losing the valance in a color tone.