scholarly journals Velocity Measurement by Coherent Spatial Filter System

1972 ◽  
Vol 8 (4) ◽  
pp. 440-447
Author(s):  
Haruo OGIWARA
Keyword(s):  
Velocity Measurement ◽  
Spatial Filter ◽  
Filter System

Perception of contour from motion and contextual modulation signals in human visual cortical areas recorded by 3D magnetometer-spatial filter system

1998 ◽  
Vol 31 ◽  
pp. S271
Author(s):  
Kenji Yoshikawa ◽  
Keisuke Toyama ◽  
Yoshio Ohtani ◽  
Shu Wakoh ◽  
Yoshimichi Ejima ◽  
...  
Keyword(s):  
Spatial Filter ◽  
Contextual Modulation ◽  
Filter System ◽  
Cortical Areas ◽  
Visual Cortical

scholarly journals Characteristics of Local Modulation Beam Propagating through Spatial Filter System

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Kewei You ◽  
Yanli Zhang ◽  
Xuejie Zhang ◽  
Jianqiang Zhu
Keyword(s):  
Beam Quality ◽  
Spatial Filter ◽  
Defect Size ◽  
Local Defect ◽  
Safe Operation ◽  
Systematic Analysis ◽  
Filter System ◽  
Local Defects ◽  
Local Modulation ◽  
Modulation Degree

As local defects may significantly harm beam quality and affect safe operation, a systematic analysis of the ability of a spatial filter to alleviate these adverse effects is required. Thus, the evolutional characteristics of a beam modulated by a local defect propagating through a spatial filter system at an image reply plane and a downstream plane are analyzed in detail. Modulation stripes appear at the image reply plane; these are caused by the pinhole cutoff effect. The modulation degree increases with increasing defect size. The maximum intensification factor can reach 3.2 under certain conditions. Thus, the defect size should be restricted to a reasonable size for safe operation with a specified pinhole size. Moreover, a maximal value appears at the downstream plane, and the intensity enhances with increasing defect size. To ensure beam quality, the maximum allowable defect size and angle of the spatial filter should meet special constraints. The maximum allowable defect size is calculated based on practical configuration parameters.

Velocity Measurement for Flow Particles by Using Spatial Filtering Technique Based on Sensor Array

2012 ◽  
Vol 508 ◽  
pp. 263-266 ◽  
Author(s):  
Zeng Xi Lu ◽  
Gang Yang ◽  
Zeng Shuang Wang
Keyword(s):  
Particle Velocity ◽  
Velocity Measurement ◽  
Sensor Array ◽  
Spatial Filtering ◽  
Spatial Filter ◽  
Capacitance Sensor ◽  
Filtering Method ◽  
Filtering Technique ◽  
Moving Particle ◽  
Particle Velocity Measurement

In comparison with cross correlative method based particle velocity measurement, the spatial filtering method for particle velocity measurement has the advantages of simplicity of the measurement system and convenience of data processing. In the paper a capacitive velocimeter, based on the spatial filtering method, is described. In this approach a capacitance sensor array has been used as a spatial filter for particle velocity measurements. Experiments were performed on a test rig and the experimental results show that the system relative error is within ±4% over a velocity range of 2-5m/s for a moving particle.

Laser beam wavefront diagnostics by a three-plate ring interferometer and a grating spatial filter system

1981 ◽  
Vol 17 (9) ◽  
pp. 1768-1771 ◽  
Author(s):  
Wang Zi-jiang ◽  
Cai Xi-jie ◽  
Wang Gui-ying ◽  
Bai Jian-rong
Keyword(s):  
Laser Beam ◽  
Spatial Filter ◽  
Filter System ◽  
Ring Interferometer

scholarly journals A Novel Spatial Filter System Compensates the Measurement Error Caused by Object's Pattern.

1992 ◽  
Vol 112 (11) ◽  
pp. 1056-1063 ◽  
Author(s):  
Masayuki Terashima ◽  
Masakatu Nomura ◽  
Michitaka Hori ◽  
Jyunichi Shimomura
Keyword(s):  
Measurement Error ◽  
Spatial Filter ◽  
Filter System
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