HIGH PRECISION SPECTROMETER SYSTEM CALIBRATION FOR JEFFERSON LAB HKS EXPERIMENT

2009 ◽  
Author(s):  
Lulin Yuan ◽  
Liguang Tang ◽  
Keyword(s):  
High Precision ◽  
System Calibration ◽  
Jefferson Lab ◽  
Spectrometer System

scholarly journals Deformation Detection Method of Mine Tunnel Based on Mobile Detection System

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5400
Author(s):  
Jian Sun ◽  
Haili Sun ◽  
Ruofei Zhong ◽  
Yulong Han
Keyword(s):  
High Precision ◽  
High Efficiency ◽  
Detection System ◽  
Repeated Measurements ◽  
Structural Safety ◽  
Measurement Unit ◽  
Scanning System ◽  
Control Points ◽  
System Calibration ◽  
Tunnel Section

Subway structure safety detection is an important method to ensure the safe operation of trains. Efficient, high-precision, and automatic tunnel clearance detection is the key to ensure safe operations. This study introduces a mobile tunnel scanning system that integrates a scanner, an inertial measurement unit (IMU), and a rail car. Global Navigation Satellite System (GNSS) time and system hardware calibration are used to synchronize time and space information of the system; the attitude and speed are corrected using the control points from the tunnel to improve the accuracy of absolute positioning. The section coordinate system is converted using the control points and system calibration parameters to complete the tunnel clearance inspection, and the distance between the nearest point of the section and the clear height of the vault is given. Taking Fengxi Road’s Bashan tunnel section of Chongqing Metro Line 5 as an example, the overall system accuracy was tested. The accuracy of chord line measurements was within 1 mm, the internal coincidence accuracy of repeated measurements of the vault clear height was 1.1 mm, the internal coincidence accuracy of repeated measurements of the closest gauge point was 4.8 mm, and the system calibration accuracy was approximately 2 mm. Compared with the existing scheme, the system combines absolute measurement and relative measurement mode to judge the structural safety of tunnel section from multiple angles, high precision, and high efficiency.

FIRST EXPERIMENT TO PRODUCE Λ-HYPERNUCLEI USING ELECTRON BEAM AT JLAB

2003 ◽  
Vol 18 (02n06) ◽  
pp. 112-115 ◽  
Author(s):  
◽  
L. TANG
Keyword(s):  
Electron Beam ◽  
High Precision ◽  
Energy Resolution ◽  
General Technique ◽  
Preliminary Results ◽  
Yield And Quality ◽  
The Future ◽  
Zero Degree ◽  
Spectrometer System ◽  
New Phase

The first experiment producing Λ-hypernuclear spectroscopy using the high-precision electron beam has been carried out at Jefferson Laboratory (JLab). A zero degree tagging technique for the scattered electrons was applied and the hypernuclear spectrometer system (HNSS) was successfully used to measure spectra from the (e, e′ K+) reaction. The best energy resolution obtained thus far in hypernuclear spectroscopy with magnetic spectrometers, near or below 1 MeV, was achieved. This paper describes the general technique of HNSS and the preliminary results for the [Formula: see text] and [Formula: see text] systems. A new phase of experiment on hypernuclear spectroscopy is approved for the future with much higher yield and quality and even better energy resolution.

Calibration Method Using Concentric Circles Planar Template and its Application

2011 ◽  
Vol 460-461 ◽  
pp. 111-116
Author(s):  
Guang Yu Zhu ◽  
Jian Qing Zou ◽  
Peng Guo ◽  
Huai Ceng Zheng
Keyword(s):  
High Precision ◽  
Calibration Method ◽  
Random Errors ◽  
Cable Line ◽  
System Calibration ◽  
Vision Measurement ◽  
Dimension Measurement ◽  
Industrial Dimension ◽  
Concentric Circles ◽  
Scene Depth

This article introduces a new calibration method for machine vision measurement system--calibration method using concentric circles planar template. This method not only considering lens distortion and random errors introduced by the process of calibration, but also overcome limitation of strict demands for the standard parts’ position and complexity in stereovision computation, it also capable of conduct calibration to the whole scene depth space, effectively improve the efficiency of calibration with its simple and high precision mean. A relatively high precision can be achieved by applying this new method to diameter measurement of cable line, which is suitable to conduct on-field industrial dimension measurement calibration.

Calibration of Weights and Weight Sets Based on Micro-Mass Standard Measurement System

2014 ◽  
Vol 609-610 ◽  
pp. 1473-1477 ◽  
Author(s):  
Xiao Ping Ren ◽  
Jian Wang ◽  
Yue Zhang ◽  
Wilson Ombati
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Force Measurements ◽  
Robot System ◽  
System Calibration ◽  
Standard Measurement ◽  
Drive Trains ◽  
Set Up ◽  
Automatic Mass ◽  
Metrological Parameters

The growing and evolving dynamics in mass and force measurements has inevitably necessitated the need for high precision and accurate results. As a result, measurements in micro-gram (s) and nanoNewtons levels have increasingly attracted potential research interests. In an effort to develop such solutions, the National Institute of Metrology (NIM) has set up a new robot system CCR10 (readability 0.1μg) for accurate measurements of weight (s) ( 1 mg). This system is based on computer controls and linear-drive trains, and is used for calibration/verification of weight (s) below 10 g. A detailed description of the robots metrological parameters and calibration results thereof is presented in the current paper. Keywords: Micro Weights; nanoForce; Automatic Mass Comparator; Robot System; Calibration

Use of LaB6 for a High Quality, Small Energy Spread Beam in an Electron Velocity Spectrometer

1976 ◽  
Vol 34 ◽  
pp. 534-535 ◽  
Author(s):  
P. E. Batson ◽  
C. H. Chen ◽  
J. Silcox
Keyword(s):  
High Temperature ◽  
Energy Resolution ◽  
Electron Velocity ◽  
Electronic Excitations ◽  
Small Energy ◽  
Small Intensity ◽  
Good Energy ◽  
Spectrometer System ◽  
Electron Energy Loss ◽  
Very High

Electron energy loss experiments combined with microscopy have proven to be a valuable tool for the exploration of the structure of electronic excitations in materials. These types of excitations, however, are difficult to measure because of their small intensity. In a usual situation, the filament of the microscope is run at a very high temperature in order to present as much intensity as possible at the specimen. This results in a degradation of the ultimate energy resolution of the instrument due to thermal broadening of the electron beam.We report here observations and measurements on a new LaB filament in a microscope-velocity spectrometer system. We have found that, in general, we may retain a good energy resolution with intensities comparable to or greater than those available with the very high temperature tungsten filament. We have also explored the energy distribution of this filament.

Automatic measurement of SAED patterns from asbestos minerals

1988 ◽  
Vol 46 ◽  
pp. 846-847
Author(s):  
J. C. Russ ◽  
T. Taguchi ◽  
P. M. Peters ◽  
E. Chatfield ◽  
J. C. Russ ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
High Precision ◽  
Diffraction Data ◽  
Automatic Measurement ◽  
Automatic Method ◽  
Important Method ◽  
X Ray ◽  
Integrated Intensity ◽  
Asbestiform Minerals ◽  
True Center

Conventional SAD patterns as obtained in the TEM present difficulties for identification of materials such as asbestiform minerals, although diffraction data is considered to be an important method for making this purpose. The preferred orientation of the fibers and the spotty patterns that are obtained do not readily lend themselves to measurement of the integrated intensity values for each d-spacing, and even the d-spacings may be hard to determine precisely because the true center location for the broken rings requires estimation. We have implemented an automatic method for diffraction pattern measurement to overcome these problems. It automatically locates the center of patterns with high precision, measures the radius of each ring of spots in the pattern, and integrates the density of spots in that ring. The resulting spectrum of intensity vs. radius is then used just as a conventional X-ray diffractometer scan would be, to locate peaks and produce a list of d,I values suitable for search/match comparison to known or expected phases.

On effects of non-systematic reflections on weak-beam images of partial dislocations

1991 ◽  
Vol 49 ◽  
pp. 688-689
Author(s):  
K. Z. Botros ◽  
S. S. Sheinin
Keyword(s):  
High Precision ◽  
Stacking Fault ◽  
Important Application ◽  
Stacking Fault Energy ◽  
Sharp Peak ◽  
Weak Beam ◽  
Partial Dislocations ◽  
Deviation Parameter ◽  
Beam Diffraction

The main features of weak beam images of dislocations were first described by Cockayne et al. using calculations of intensity profiles based on the kinematical and two beam dynamical theories. The feature of weak beam images which is of particular interest in this investigation is that intensity profiles exhibit a sharp peak located at a position very close to the position of the dislocation in the crystal. This property of weak beam images of dislocations has an important application in the determination of stacking fault energy of crystals. This can easily be done since the separation of the partial dislocations bounding a stacking fault ribbon can be measured with high precision, assuming of course that the weak beam relationship between the positions of the image and the dislocation is valid. In order to carry out measurements such as these in practice the specimen must be tilted to "good" weak beam diffraction conditions, which implies utilizing high values of the deviation parameter Sg.

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