Minimizing effect of Sun-Earth-probe angle for RF / optical hybrid telescope

2020 ◽  
Author(s):  
Makan Mohageg ◽  
Mary C. Lorio ◽  
Daniel J. Hoppe ◽  
John N. Huleis ◽  
Alexander Abramovici ◽  
...  
Keyword(s):  
Probe Angle

Analysis of Pitot Tube Static Probe Angle in the Experimental Chamber Conditions

2018 ◽  
Vol 87 (1) ◽  
pp. 369-375
Author(s):  
Pavla Hlavatá ◽  
Jiří Maxa ◽  
Petr Vyroubal
Keyword(s):  
Pitot Tube ◽  
Experimental Chamber ◽  
Probe Angle

scholarly journals 2B31 Laparoscopic ultrasound and endoscopic image overlay system using probe angle detection

2014 ◽  
Vol 2014.26 (0) ◽  
pp. 313-314
Author(s):  
Ryo OGUMA ◽  
Toshiya NAKAGUCHI ◽  
Ryoichi NAKAMURA ◽  
Tadashi YAMAGUCHI ◽  
Hiroshi KAWAHIRA ◽  
...  
Keyword(s):  
Laparoscopic Ultrasound ◽  
Endoscopic Image ◽  
Probe Angle ◽  
Image Overlay

scholarly journals In Situ Measurement of Spindle Radial and Tilt Error Motions by Complementary Multi-probe Method

2019 ◽  
Vol 2 (4) ◽  
pp. 225-234 ◽  
Author(s):  
Fei Ding ◽  
Xichun Luo ◽  
Wenlong Chang ◽  
Zhengjian Wang
Keyword(s):  
Probe Method ◽  
Displacement Sensor ◽  
Air Bearing ◽  
Harmonic Suppression ◽  
Radial Error ◽  
Tilt Error ◽  
Measurement Results ◽  
Probe Angle ◽  
Measurement Approach

Abstract This paper presents a complementary multi-probe method for measurement of radial and tilt error motions of a spindle. Neither indexing of artefact nor rotating of spindle housing is required and thus make it suitable for in situ evaluation of spindle performance effectively. In order to minimize the harmonic suppression problems commonly encountered in the multi-probe measurement approach, three sets of probe angle combinations were optimized and the harmonics of the three measurements were extracted and composed to reveal the true artefact errors in a complementary way. The exact probe angles were identified by the correlation function of the probe signals after the sensors are mounted onto the fixture and the requirement of high-precision fixtures was alleviated. The evaluation of measurement results showed that the erroneous harmonics were greatly reduced by 70%. Using this method, the radial error motions of the precision air bearing spindle were measured at seven axial positions and then the synchronized tilts error motions were calculated. This demonstrated an effective approach for measuring four degree-of-freedom error motions in one setup with a small number of displacement sensor probes.

scholarly journals Evaluation of Defects in Multilayer Carbon Fibre Epoxy for Aeronautics Applications

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
M. Buonsanti ◽  
M. Cacciola ◽  
S. Calcagno ◽  
G. Megali ◽  
F. C. Morabito ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Incidence Angle ◽  
Ultrasonic Probe ◽  
Reinforced Polymers ◽  
Proposed Model ◽  
Probe Angle ◽  
Carbon Fibre Reinforced Polymers ◽  
Defects Identification ◽  
Simulation Parameters ◽  
Method Approach

Production of carbon fibre reinforced polymers is an elaborate process unfree from faults and problems. Problems during the manufacturing, such as plies' overlapping, can cause flaws in the resulting material, so compromising its integrity. Compared with metallic materials, carbon epoxy composites show a number of advantages. Within this framework, ultrasonic tests are effective to identify the presence of defects. In this paper a Finite Element Method approach is proposed for evaluating the most effective incidence angle of an ultrasonic probe with regard to defects' identification. According to our goal, the analysis has been carried out considering a single-line plane emitting source varying the probe angle of inclination. The proposed model looks promising to specially emphasize the presence of delaminations as well as massive breaking in a specimen of multilayer carbon fibre epoxy. Subsequently, simulation parameters and results have been exploited and compared, respectively, for a preliminary experimental in-lab campaign of measurements with encouraging results.

The Pre-Travel Error Study of Electrical Trigger Probe in On-Machine Measurement

2016 ◽  
Vol 693 ◽  
pp. 1466-1473 ◽  
Author(s):  
Yong Lin Cai ◽  
Ning Ning Cui ◽  
Xiang Mo ◽  
Xiang Kai Yao ◽  
Wei Qing Sun
Keyword(s):  
Mathematical Model ◽  
Machine Tool ◽  
Measurement Accuracy ◽  
Nc Machining ◽  
Efficient Measure ◽  
High Efficient ◽  
Probe Angle ◽  
Moving Direction ◽  
The Mathematical Model ◽  
Error Study

On-machine measurement is a high-efficient measure method in NC machining, and there are pre-travel errors during measurement. What is more, these errors tend to present anisotropy, and affect the measurement accuracy. This paper aimed at measuring the anisotropy of probe’s pre-travel error. First, the standard ball is measured by changing the probe angle with the same machine tool moving direction, and the pre-travel errors with different probe angles under the same machine tool errors are obtained. Then, the machine tool backlash errors are measured and compensated, and the pre-travel errors with different probe angle are obtained. Finally, the mathematical model of pre-travel error is established. The method proposed in this paper can be used to determine probe’s pre-travel error with anisotropy.

Deformation of the cell nucleus under indentation: Mechanics and mechanisms

2006 ◽  
Vol 21 (8) ◽  
pp. 2126-2135 ◽  
Author(s):  
A. Vaziri ◽  
H. Lee ◽  
M.R. Kaazempur Mofrad
Keyword(s):  
Nuclear Envelope ◽  
Cell Nucleus ◽  
Computational Models ◽  
Biological Response ◽  
Nuclear Lamina ◽  
Systematic Analysis ◽  
Force Microscopy ◽  
Probe Angle ◽  
Elastic Layers

Computational models of the cell nucleus, along with experimental observations, can help in understanding the biomechanics of force-induced nuclear deformation and mechanisms of stress transition throughout the nucleus. Here, we develop a computational model for an isolated nucleus undergoing indentation, which includes separate components representing the nucleoplasm and the nuclear envelope. The nuclear envelope itself is composed of three separate layers: two thin elastic layers representing the inner and outer nuclear membranes and one thicker layer representing the nuclear lamina. The proposed model is capable of separating the structural role of major nuclear components in the force-induced biological response of the nucleus (and ultimately the cell). A systematic analysis is carried out to explore the role of major individual nuclear elements, namely inner and outer membranes, nuclear lamina, and nucleoplasm, as well as the loading and experimental factors such as indentation rate and probe angle, on the biomechanical response of an isolated nucleus in atomic force microscopy indentation experiment.

Sign in / Sign up

Export Citation Format

Share Document