scholarly journals APPLICATION OF CATHODOLUMINESCENCE FOR ON-LINE MONITORING OF REGIME OF AN INDUSTRIAL ELECTRON ACCELERATOR

2019 ◽  
pp. 168-171
Author(s):  
R.I. Pomatsalyuk ◽  
S.K. Romanovsky ◽  
V.A. Shevchenko ◽  
A.Eh. Tenishev ◽  
V.Yu. Titov ◽  
...  
Keyword(s):  
Electron Accelerator ◽  
Absorbed Dose ◽  
Beam Current ◽  
Critical Parameters ◽  
Line Measurement ◽  
On Line ◽  
Current Electron ◽  
The Mean ◽  
Contact Free

Continuous monitoring of critical parameters of an industrial electron accelerator provides quality of product processing. For that purpose, the methods of contact-free diagnostics of processing regime are developed. One of them is based on application of a wide-aperture stack-monitor for on-line measurement of beam current, electron energy, and also the mean absorbed dose over the plain of beam scanning in an irradiated object [1]. In the work, the conditions of application of cathodoluminescence (CL), accompanied action of accelerated electrons on amorphous dielectrics, for adjustment of the stack-monitor, and also for measuring in on-line mode the dose in a point of control as well as of distribution of the electron flux density on the surface of the object, is studied. It is shown, that titanium dioxide, keeping the radiation-optical yield at an accumulated dose of up to 4 MGy, can be considered as a promising material for manufacturing of CL detector.

On-line measurement of proton beam current in pA range

2006 ◽  
Vol 249 (1-2) ◽  
pp. 760-763 ◽  
Author(s):  
V. Auzelyte ◽  
F. Andersson ◽  
M. Elfman ◽  
P. Kristiansson ◽  
J. Pallon ◽  
...  
Keyword(s):  
Proton Beam ◽  
Beam Current ◽  
Line Measurement ◽  
On Line

Pulsed Electron Beam Propagation in Oxygen

2016 ◽  
Vol 712 ◽  
pp. 31-36
Author(s):  
Galina Kholodnaya ◽  
Roman Sazonov ◽  
Denis Ponomarev ◽  
Artyem Poloskov
Keyword(s):  
Electron Beam ◽  
Drift Tube ◽  
Electron Accelerator ◽  
Reverse Current ◽  
Absorbed Dose ◽  
Beam Propagation ◽  
Drift Chamber ◽  
Beam Current ◽  
Electron Beam Current ◽  
Pulsed Electron Beam

The paper presents the results of the experimental investigation of the pulsed electron beam propagation propagated in a drift tube filled with oxygen. The pressure was 50, 300, and 760 Torr in the drift tube. The experiments were carried out using a TEA-500 pulsed electron accelerator (450 kV accelerating voltage; 10 kA electron beam current; 80±1 ns pulse duration to the base; up to 200 J pulse energy; and 5 cm diameter beam). The electron beam was propagated in the drift tube (40 cm long), 14 cm in diameter composed of two sections equipped with two reverse current shunts. The experiments were carried out which fixed the absorbed dose registered on the walls of the drift chamber.

scholarly journals Experimental Study on the Performance of Hydraulic Vibration Assisted Broaching (HVAB) Based on Piezoelectric Sensors

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2417
Author(s):  
Zhen Meng ◽  
Jing Ni ◽  
Yu Shi ◽  
Chuan-Yu Wu ◽  
Xiang-Qi Liu
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Cutting Force ◽  
Surface Quality ◽  
Piezoelectric Sensors ◽  
Vibration Frequencies ◽  
Line Measurement ◽  
On Line ◽  
Flank Face

In order to improve the keyway broaching process and verify the feasibility of vibration-assisted broaching process, an experimental study on a novel hydraulic vibration assisted broaching (HVAB) system with double-valve electro-hydraulic exciter (DVEHE) is proposed in this paper. The performances of HVAB at different excitation frequencies were compared from three aspects: (a) the cutting force under the different vibration frequencies, (b) the surface roughness of the workpiece, and (c) the flank face wear of the tool. For precision on-line measurement of larger broaching forces, four piezoelectric sensors were fixed on the broaching machine. The experimental results show that HVAB can effectively improve the performance of the broaching process, approximately reduce the broaching force by as much as 9.7% compared to conventional broaching (CB) and improve the surface quality of workpiece. Some explanations are offered to support the observations.

scholarly journals Measurement of Period Length and Skew Angle Patterns of Textile Cutting Pieces Based on Faster R-CNN

2019 ◽  
Vol 9 (15) ◽  
pp. 3026 ◽  
Author(s):  
Geng ◽  
Meng ◽  
Xiao ◽  
Liu
Keyword(s):  
Period Length ◽  
Critical Parameters ◽  
Average Error ◽  
Segmentation Method ◽  
Skew Angle ◽  
Precise Position ◽  
The Mean ◽  
Period Pattern ◽  
Average Position

The skew angle and period length of the multi-period pattern are two critical parameters for evaluating the quality of textile cutting pieces. In this paper, a new measurement method of the skew angle and period length is proposed based on Faster region convolutional neural network (R-CNN). First, a dataset containing approximately 5000 unique pattern images was established and annotated in the format of PASCAL VOC 2007. Second, the Faster R-CNN model was used to detect the pattern to determine the approximate location of the pattern (the position of the whole pattern). Third, precise position of the pattern (geometric center points of pattern) are processed based on the approximate position results using the automatic threshold segmentation method. Finally, the four-neighbor method was used to fill the missing center points to obtain a complete center point map, and the skew angle and period length can be measured by the detected center points. The experimental results show that the mean average position (mAP) of the pattern detection reached 84%, the average error of the proposed algorithm was less than 5% compared with the error of the manual measurement.

scholarly journals The Assessment of Cross Machine Openness Uniformity of a Fiber Feed Matt

2000 ◽  
Vol os-9 (4) ◽  
pp. 1558925000OS-90
Author(s):  
Ayad Oumera ◽  
Abdelfattah M. Seyam ◽  
William Oxenham
Keyword(s):  
Thickness Measurement ◽  
One Dimensional ◽  
Line Measurement ◽  
On Line ◽  
Compression Data ◽  
The One ◽  
Compression Characteristics ◽  
Input Level

The one-dimensional characteristic of yarn has resulted in very little attention being given to the uniformity of carded web in the cross machine direction. The development of nonwovens has prompted researchers to reconsider the importance of cross machine uniformity in determining the total uniformity of the carded web. It is therefore important to develop manual and online techniques to quantify cross machine uniformity at both the input and output of the card. At the card input, uniformity is taken as representing both mass and openness characteristics of the feed matt. While at the card output, there are many available techniques that allow the on-line measurement of the mass uniformity of the carded web, determination of uniformity at the input level is more difficult. The approach that was taken was to use an off-line technique to find the mass and openness of the feed matt at different locations across the card. While traditionally mass as a property has been given a lot of importance, much less attention has been given to the concept of openness. This is due in part to the difficulty in quantifying openness. Openness is believed to have great significance in determining the overall quality of the carded web, especially with regard to the formation of neps. In order to make the concept of openness more clear, it was found necessary to develop a way of quantifying it. This was done by performing a compression test on the feed matt, and then fitting the compression data with an exponential curve. The coefficient of the exponent was used to represent openness. This approach was used to find the effect of the feed roller (pin type) on cross machine uniformity. It was found that the squeezing of the feed roller did not have an effect in redistributing the mass of the feed matt, but did have an effect in changing the openness of the feed matt. Because of the difficulty involved in the handling of the feed matt, a newly developed technique is suggested to characterize openness. While this method still relies on the compression characteristics of the feed matt, it is more appropriate because it is performed on-line. Preliminary results are reported. It was found that thickness measurement under carefully selected pressure value could be used to characterize openness precisely.

scholarly journals CALIBRATION OF A SYSTEM FOR ON-LINE MONITORING OF ELECTRON ENERGY AND ABSORBED DOSE AT AN INDUSTRIAL ACCELERATOR LU-10

2020 ◽  
pp. 131-135
Author(s):  
R.I. Pomatsalyuk ◽  
V.Yu. Tytov ◽  
D.V. Titov ◽  
V.L. Uvarov ◽  
V.A. Shevchenko
Keyword(s):  
Electron Energy ◽  
Beam Energy ◽  
Operating Experience ◽  
Absorbed Dose ◽  
Particle Beam ◽  
Processing Parameters ◽  
Critical Parameters ◽  
Electron Accelerators ◽  
On Line ◽  
Industrial Accelerator

Particle beam energy and absorbed dose are critical parameters of product processing at industrial electron accelerators. For on-line monitoring of those parameters, a method based on measuring of distribution of the charge induced by irradiation in a wide-aperture stack-monitor, positioned behind an irradiated object, has been developed. A brief review of a control system for monitoring of the processing parameters created with the use of the EPICS package as well as the data of its operating experience at an LU-10 Linac of NSC KIPT are presented in the article. The procedure and results of calibration of the measuring channels within the electron energy range 8…10 MeV are described.

On-Line Measurement of Rheological Properties of LDPE, HDPE and LDPE/MICA Systems in Single-Screw Extrusion

2014 ◽  
Vol 941-944 ◽  
pp. 1788-1791
Author(s):  
Hong He ◽  
Jian Guo Zhou
Keyword(s):  
Rheological Properties ◽  
Extrusion Process ◽  
Multiphase System ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Single Screw Extruder ◽  
Line Measurement ◽  
Screw Extrusion ◽  
On Line

The quality of extrudate is closely related to its rheological properties during extrusion. Therefore, on-line measurement of rheological properties of polymer is important in extrusion process. In the present work, comparisons between the on-line viscosities of LDPE in single screw extruder and that in lab under the same condition were made by using online rheometer. Effects of set temperature of on-line rheometer, screw configuration and different positions, as well as weight proportions of filler, size of MICA particles of LDPE/MICA multiphase system on the melt viscosity in single screw extrusion are discussed.

Thickness Measurement in the AEM by Macintosh-Based Analysis of Two-Beam Convergent Beam Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 504-505
Author(s):  
John F. Mansfield ◽  
Douglas C. Crawford
Keyword(s):  
Electron Microscope ◽  
Video Camera ◽  
Thickness Measurement ◽  
Specimen Thickness ◽  
Crystalline Materials ◽  
Beam Dynamic ◽  
Line Measurement ◽  
On Line ◽  
Image Position ◽  
Convergent Beam

A method has been developed that allows on-line measurement of the thickness of crystalline materials in the analytical electron microscope. Two-beam convergent beam electron diffraction (CBED) patterns are digitized from a JEOL 2000FX electron microscope into an Apple Macintosh II microcomputer via a Gatan #673 CCD Video Camera and an Imaging Systems Technology Video 1000 frame-capture board. It is necessary to know the lattice parameters of the sample since measurements are made of the spacing of the diffraction discs in order to calibrate the pattern. The sample thickness is calculated from measurements of the spacings of the fringes that are seen in the diffraction discs. This technique was pioneered by Kelly et al, who used the two-beam dynamic theory of MacGillavry relate the deviation parameter (Si) of the ith fringe from the exact Bragg condition to the specimen thickness (t) with the equation:Where ξg, is the extinction distance for that reflection and ni is an integer.

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