Real-time wide dynamic range spectrometer using a rapidly wavelength-switchable terahertz parametric source

2021 ◽  
Author(s):  
Sota Mine ◽  
Kodo Kawase ◽  
Kosuke Murate
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Wide Dynamic Range ◽  
Parametric Source

scholarly journals Development of real-time radioisotope imaging systems for plant nutrient uptake studies

2012 ◽  
Vol 367 (1595) ◽  
pp. 1501-1508 ◽  
Author(s):  
Satomi Kanno ◽  
Masato Yamawaki ◽  
Hiroki Ishibashi ◽  
Natsuko I. Kobayashi ◽  
Atsushi Hirose ◽  
...  
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Imaging Techniques ◽  
Ion Uptake ◽  
Imaging Systems ◽  
Wide Dynamic Range ◽  
Whole Plant ◽  
Uptake Studies ◽  
Set Up ◽  
Ionic Movement

Ionic nutrition is essential for plant development. Many techniques have been developed to image and (or) measure ionic movement in plants. Nevertheless, most of them are destructive and limit the analysis. Here, we present the development of radioisotope imaging techniques that overcome such restrictions and allow for real-time imaging of ionic movement. The first system, called macroimaging, was developed to visualize and measure ion uptake and translocation between organs at a whole-plant scale. Such a device is fully compatible with illumination of the sample. We also modified fluorescent microscopes to set up various solutions for ion uptake analysis at the microscopic level. Both systems allow numerical analysis of images and possess a wide dynamic range of detection because they are based on radioactivity.

Smart microfluidic analogue of Wheatstone-bridge for real-time continuous detection with ultrasensitivity and wide dynamic range

2021 ◽  
Vol 407 ◽  
pp. 127138
Author(s):  
Jian Peng ◽  
Ning Zhao ◽  
Shuo Lin ◽  
Wei Wang ◽  
Mao-Jie Zhang ◽  
...  
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Wheatstone Bridge ◽  
Wide Dynamic Range

scholarly journals Real-time Noise-suppressed Wide-Dynamic-Range Compression in Ultrahigh-Resolution Neuronal Imaging

2021 ◽  
Author(s):  
Bhaskar Jyoti Borah ◽  
Chi-Kuang Sun
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Contrast Ratio ◽  
Nerve Fibers ◽  
Wide Dynamic Range ◽  
Data Set ◽  
Dynamic Range Compression ◽  
Weak Intensity ◽  
Neuronal Imaging ◽  
Dedicated Hardware

SummaryWith a limited dynamic range of an imaging system, there are always regions with signal intensities comparable to the noise level, if the signal intensity distribution is close to or even wider than the available dynamic range. Optical brain/neuronal imaging is such a case where weak-intensity ultrafine structures, such as, nerve fibers, dendrites and dendritic spines, often coexist with ultrabright structures, such as, somas. A high fluorescence-protein concentration makes the soma order-of-magnitude brighter than the adjacent ultrafine structures resulting in an ultra-wide dynamic range. A straightforward enhancement of the weak-intensity structures often leads to saturation of the brighter ones, and might further result in amplification of high-frequency background noises. An adaptive illumination strategy to real-time-compress the dynamic range demands a dedicated hardware to operate and owing to electronic limitations, might encounter a poor effective bandwidth especially when each digitized pixel is required to be illumination optimized. Furthermore, such a method is often not immune to noise-amplification while locally enhancing a weak-intensity structure. We report a dedicated-hardware-free method for rapid noise-suppressed wide-dynamic-range compression so as to enhance visibility of such weak-intensity structures in terms of both contrast-ratio and signal-to-noise ratio while minimizing saturation of the brightest ones. With large-FOV aliasing-free two-photon fluorescence neuronal imaging, we validate its effectiveness by retrieving weak-intensity ultrafine structures amidst a strong noisy background. With compute-unified-device-architecture (CUDA)-acceleration, a time-complexity of <3 ms for a 1000×1000-sized 16-bit data-set is secured, enabling a real-time applicability of the same.

Demonstration of Real-Time Burst-Mode Digital Coherent Reception With Wide Dynamic Range in DSP-Based PON Upstream

2017 ◽  
Vol 35 (8) ◽  
pp. 1392-1398 ◽  
Author(s):  
Ryo Koma ◽  
Masamichi Fujiwara ◽  
Jun-ichi Kani ◽  
Sang-Yuep Kim ◽  
Takahiro Suzuki ◽  
...  
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Wide Dynamic Range ◽  
Burst Mode

Slow-Scan CCD Observation of Backscattering Patterns in SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1308-1309
Author(s):  
F. Ouyang ◽  
D. A. Ray ◽  
O. L. Krivanek
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Lens System ◽  
Wide Dynamic Range ◽  
Peltier Cooler ◽  
Diffraction Patterns ◽  
Scanning Electron

Electron backscattering Kikuchi diffraction patterns (BKDP) reveal useful information about the structure and orientation of crystals under study. With the well focused electron beam in a scanning electron microscope (SEM), one can use BKDP as a microanalysis tool. BKDPs have been recorded in SEMs using a phosphor screen coupled to an intensified TV camera through a lens system, and by photographic negatives. With the development of fiber-optically coupled slow scan CCD (SSC) cameras for electron beam imaging, one can take advantage of their high sensitivity and wide dynamic range for observing BKDP in SEM.We have used the Gatan 690 SSC camera to observe backscattering patterns in a JEOL JSM-840A SEM. The CCD sensor has an active area of 13.25 mm × 8.83 mm and 576 × 384 pixels. The camera head, which consists of a single crystal YAG scintillator fiber optically coupled to the CCD chip, is located inside the SEM specimen chamber. The whole camera head is cooled to about -30°C by a Peltier cooler, which permits long integration times (up to 100 seconds).

Design of an Offner convex grating radiation calibration light source with a wide dynamic range

2020 ◽  
Vol 13 (5) ◽  
pp. 1085-1093
Author(s):  
XU Da ◽  
◽  
YUE Shi-xin ◽  
ZHANG Guo-yu ◽  
SUN Gao-fei ◽  
...  
Keyword(s):  
Light Source ◽  
Dynamic Range ◽  
Wide Dynamic Range
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