New noninvasive measurement method of optics parameters in a storage ring using bunch-by-bunch 3D beam position measurement data

Beam signal stretch is significant for bunch-by-bunch position measurement on storage ring in SSRF. This paper deduced a new expression to get beam position according to the relationship between BPM signals and beam position. The simulation has been done to stretch the BPM signal using square processing with matlab/simulink tool. The comparison is given between square process and original difference over sum method(Δ/Σ) using data acquired by oscilloscope and off-line processing.

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Beam Position Measurement in the Photon Factory Storage Ring

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1983.4332814 ◽

1983 ◽

Vol 30 (4) ◽

pp. 2353-2355 ◽

Cited By ~ 2

Author(s):

T. Katsura ◽

H. Nakagawa ◽

S. Shibata

Keyword(s):

Storage Ring ◽

Position Measurement ◽

Beam Position ◽

Photon Factory

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Detection and Analysis of Rats’ Bioelectromagnetic Signal

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.536-537.13 ◽

2014 ◽

Vol 536-537 ◽

pp. 13-17

Author(s):

Hong Long Cao ◽

Fen Ju Qin ◽

Xue Guan Liu ◽

He Ming Zhao

Keyword(s):

Standard Deviation ◽

Automatic System ◽

Measurement Method ◽

Measurement Accuracy ◽

Biological Activities ◽

Measurement Data ◽

Measured Data ◽

The Mean ◽

Frequency Window ◽

Window Effects

In this paper, we designed an automatic system and automatic test software, and they can carry out Kunming rats bioelectromagnetic measurement in standard status and anesthesia automatically in anechoic chamber where the electromagnetic field outside is shielded, the reflection wave is absorbed, and the measurement accuracy will be improved. We get a great number of measurement data with frequency-sweep measurement method. The mean and standard deviation of amplitudes vs. frequencies is calculated and analyzed. The results show the measurement method is feasible. We have plotted the means of measured data as multiple sets of Y values in a series of bars with standard deviations bars included and distributed in the frequency axis of X. It is found that the fluctuation of the mean and standard deviation in some frequencies is not evident which may explain frequency window effects, while in other frequencies, such a fluctuation can be obviously observed, which may suggest that bioelectromagnetic signal is influenced by biological activities (standard and anaesthesia status) in these frequency points.

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A New Rotor Position Measurement Method for Permanent Magnet Spherical Motors

Applied Sciences ◽

10.3390/app8122415 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2415 ◽

Cited By ~ 3

Author(s):

Yin Lu ◽

Cungang Hu ◽

Qunjing Wang ◽

Yi Hong ◽

Weixiang Shen ◽

...

Keyword(s):

Permanent Magnet ◽

High Speed ◽

Measurement Method ◽

Coordinate Frame ◽

Feature Points ◽

Position Measurement ◽

Experimental Platform ◽

Rotor Position ◽

Straight Line ◽

The World

This paper proposes a new high-precision rotor position measurement (RPM) method for permanent magnet spherical motors (PMSMs). In the proposed method, a LED light spot generation module (LSGM) was installed at the top of the rotor shaft. In the LSGM, three LEDs were arranged in a straight line with different distances between them, which were formed as three optical feature points (OFPs). The images of the three OFPs acquired by a high-speed camera were used to calculate the rotor position of PMSMs in the world coordinate frame. An experimental platform was built to verify the effectiveness of the proposed RPM method.

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High Precision Position Measurement Method for Laguerre-Gaussian Beams Using a Quadrant Detector

Sensors ◽

10.3390/s18114007 ◽

2018 ◽

Vol 18 (11) ◽

pp. 4007 ◽

Cited By ~ 3

Author(s):

Qian Li ◽

Jiabin Wu ◽

Yunshan Chen ◽

Jingyuan Wang ◽

Shijie Gao ◽

...

Keyword(s):

Maximum Error ◽

Least Square ◽

New Method ◽

Beam Radius ◽

Engineering Practice ◽

Gaussian Beams ◽

Good Prospect ◽

Position Measurement ◽

Beam Position ◽

Mean Square Errors

In this paper, we propose a new method to improve the position measurement accuracy for Laguerre-Gaussian beams on a quadrant detector (QD). First, the error effects of the detector diameter and the gap size are taken into account, and the position error compensation factor is introduced into the conventional formula. Then, in order to reduce the number of parameters, the concept of effective radius is proposed. Thus, a new analytical expression is obtained with a best fit using the least square method. It is verified by simulation that this approach can reduce the maximum error by 97.4% when the beam radius is 0.95 mm; meanwhile, the root mean square errors under different radii are all less than 0.004 mm. The results of simulation show that the new method could effectively improve the accuracy of the QD measurement for different radii. Therefore, the new method would have a good prospect in the engineering practice of beam position measurements.

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Measurement experiences with FluxSet digital D/I station

Geoscientific Instrumentation Methods and Data Systems ◽

10.5194/gi-6-279-2017 ◽

2017 ◽

Vol 6 (2) ◽

pp. 279-284 ◽

Cited By ~ 2

Author(s):

László Hegymegi ◽

János Szöllősy ◽

Csaba Hegymegi ◽

Ádám Domján

Keyword(s):

Measurement Method ◽

Measurement Data ◽

Digital Form ◽

New Instrument ◽

Measurement Results ◽

Inclination Angles ◽

Flux Gate

Abstract. Geomagnetic observatories use classical theodolites equipped with single-axis flux-gate magnetometers known as declination–inclination magnetometers (DIM) to determine absolute values of declination and inclination angles. This instrument and the measurement method are very reliable but need a lot of handwork and experience. The authors developed and built a non-magnetic theodolite which gives all measurement data in digital form. Use of this instrument significantly decreases the possibility of observation errors and minimises handwork. The new instrument is presented in this paper together with first measurement results in comparison to the classical DIM.

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A phase-space beam position monitor for synchrotron radiation

Journal of Synchrotron Radiation ◽

10.1107/s1600577515007390 ◽

2015 ◽

Vol 22 (4) ◽

pp. 946-955 ◽

Cited By ~ 4

Author(s):

Nazanin Samadi ◽

Bassey Bassey ◽

Mercedes Martinson ◽

George Belev ◽

Les Dallin ◽

...

Keyword(s):

Phase Space ◽

Synchrotron Radiation ◽

Incident Angle ◽

Operating Conditions ◽

Photon Beam ◽

Profile Measurement ◽

Beam Position Monitor ◽

Position Measurement ◽

Beam Position ◽

X Ray

The stability of the photon beam position on synchrotron beamlines is critical for most if not all synchrotron radiation experiments. The position of the beam at the experiment or optical element location is set by the position and angle of the electron beam source as it traverses the magnetic field of the bend-magnet or insertion device. Thus an ideal photon beam monitor would be able to simultaneously measure the photon beam's position and angle, and thus infer the electron beam's position in phase space. X-ray diffraction is commonly used to prepare monochromatic beams on X-ray beamlines usually in the form of a double-crystal monochromator. Diffraction couples the photon wavelength or energy to the incident angle on the lattice planes within the crystal. The beam from such a monochromator will contain a spread of energies due to the vertical divergence of the photon beam from the source. This range of energies can easily cover the absorption edge of a filter element such as iodine at 33.17 keV. A vertical profile measurement of the photon beam footprint with and without the filter can be used to determine the vertical centroid position and angle of the photon beam. In the measurements described here an imaging detector is used to measure these vertical profiles with an iodine filter that horizontally covers part of the monochromatic beam. The goal was to investigate the use of a combined monochromator, filter and detector as a phase-space beam position monitor. The system was tested for sensitivity to position and angle under a number of synchrotron operating conditions, such as normal operations and special operating modes where the photon beam is intentionally altered in position and angle at the source point. The results are comparable with other methods of beam position measurement and indicate that such a system is feasible in situations where part of the synchrotron beam can be used for the phase-space measurement.

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