Dynamic measurement of three-dimensional absolutedisplacements using dual-camera multiplexed digitalholography

2022 ◽  
Author(s):  
Yun Pan ◽  
Kaifu Wang
Keyword(s):  
Three Dimensional ◽  
Dynamic Measurement

scholarly journals The utility of intra-operative three-dimensional transoesophageal echocardiography for dynamic measurement of stroke volume

Anaesthesia ◽  
2014 ◽  
Vol 70 (2) ◽  
pp. 150-159 ◽  
Author(s):  
K. Suehiro ◽  
K. Tanaka ◽  
T. Yamada ◽  
T. Matsuura ◽  
T. Funao ◽  
...  
Keyword(s):  
Stroke Volume ◽  
Three Dimensional ◽  
Transoesophageal Echocardiography ◽  
Dynamic Measurement

Three-dimensional dynamic measurement of irregular stringy objects via digital holography

2018 ◽  
Vol 43 (6) ◽  
pp. 1283 ◽  
Author(s):  
Longchao Yao ◽  
Jun Chen ◽  
Paul E. Sojka ◽  
Xuecheng Wu ◽  
Kefa Cen
Keyword(s):  
Digital Holography ◽  
Three Dimensional ◽  
Dynamic Measurement

Three Dimensional Measurement System for the Dynamic Deformation of Aero-engine Blade Profile

2020 ◽  
Vol 29 (07n08) ◽  
pp. 2040014
Author(s):  
Yongchao Wei ◽  
Chunyan Deng ◽  
Xingkun Wu ◽  
Liangzhong Ao
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Technical Problem ◽  
Three Dimensional ◽  
Dynamic Measurement ◽  
Profile Measurement ◽  
Profile Information ◽  
Aero Engine ◽  
Phase Calibration ◽  
And Performance

In order to solve the technical problem of three-dimensional profile measurement of aero-engine blades with high speed rotation, an optical dynamic measurement system for aero-engine blades was developed. Firstly, the system is calibrated by the algorithm of spatial truncation phase calibration to establish the index between truncation phase and spatial coordinates. During the measurement, the deformation map of the rotating measured blade is obtained by synchronous projection and snapshot. By using the fast Fourier algorithm, the truncation phase is obtained, and then the profile information of blade can be obtained through the truncation phase and spatial coordinate index. Through the design and construction of the blade simulation platform and dynamic measurement experiment system, the three-dimensional profile data of the blade at different rotating speeds are obtained, compared and analyzed, and then the overall profile deformation law is discovered, which verifies the effectiveness and feasibility of the algorithm. The system can obtain the dynamic profile information of the whole blade completely, and provide innovative technical means for blade design verification and performance analysis.

scholarly journals Surface Profilometry

2021 ◽  
pp. 39-88
Author(s):  
Christopher Taudt
Keyword(s):  
Three Dimensional ◽  
Dynamic Measurement ◽  
Measurement Range ◽  
Dimensional Measurement ◽  
Surface Profilometry ◽  
Novel Approach ◽  
Three Dimensional Measurement ◽  
Measurement Capabilities

AbstractAs outlined in the previous chapter, existing technologies for surface profilometry show certain drawbacks in terms of resolution, dynamic measurement range, three-dimensional measurement capabilities and speed. The following chapter introduces a novel approach to surface profilometry which aims to provide solutions to the problems named. The basic setup for all experiments is centered around a two-beam interferometer of the Michelson type.

scholarly journals A computer-vision-based system for at-home rheumatoid arthritis rehabilitation

2019 ◽  
Vol 15 (9) ◽  
pp. 155014771987564
Author(s):  
Javier Dorado ◽  
Xavier del Toro ◽  
Maria J Santofimia ◽  
Alfonso Parreño ◽  
Ruben Cantarero ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Three Dimensional ◽  
Dynamic Measurement ◽  
Microsoft Kinect ◽  
Exercise Session ◽  
Limited Mobility ◽  
Physical Exercises ◽  
Natural Interface ◽  
Rehabilitation Exercise ◽  
At Home

People suffering from rheumatoid arthritis are normally prescribed with physical exercises. The realization of these exercise routines should be supervised to prevent wrongly adopted postures or bad movements that end up harming the affected articulations. The motivational component associated with a supervised session is also important. On the contrary, having access to qualified supervision is not always possible due to different reasons, such as tight schedules, limited mobility, or economic reasons. This article presents a system for at-home rehabilitation, based on Microsoft Kinect, that resembles the role played by the physiotherapist during the supervision of an exercise session. The system not only supervises the realization of exercises but it also collects and manages information about the exercise-session history. Additionally, and despite affecting young people, rheumatoid arthritis is a disease that mainly affects seniors. For this reason, the system provides a natural interface to ease the interaction. Finally, the performance of the proposed system has been evaluated using a three-dimensional dynamic measurement system as a gold standard to validate the accuracy of the measurements. Obtained results demonstrate the potential of the Kinect-based system for at-home rehabilitation exercise routines.

scholarly journals INFORMATION MINING OF SPATIO-TEMPORAL EVOLUTION OF LAKES BASED ON MULTIPLE DYNAMIC MEASUREMENTS

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 1137-1142
Author(s):  
W. Feng ◽  
J. Chen
Keyword(s):  
Comprehensive Evaluation ◽  
Three Dimensional ◽  
Dynamic Measurement ◽  
Dynamic Evolution ◽  
Natural Ecosystem ◽  
Jianghan Plain ◽  
Evaluation Indexes ◽  
Lake Evolution ◽  
Spatio Temporal ◽  
Fragmentation Dynamic

Lakes are important water resources and integral parts of the natural ecosystem, and it is of great significance to study the evolution of lakes. The area of each lake increased and decreased at the same time in natural condition, only but the net change of lakes’ area is the result of the bidirectional evolution of lakes. In this paper, considering the effects of net fragmentation, net attenuation, swap change and spatial invariant part in lake evolution, a comprehensive evaluation indexes of lake dynamic evolution were defined,. Such degree contains three levels of measurement: 1) the swap dynamic degree (SDD) reflects the space activity of lakes in the study period. 2) the attenuation dynamic degree (ADD) reflects the net attenuation of lakes into non-lake areas. 3) the fragmentation dynamic degree (FDD) reflects the trend of lakes to be divided and broken into smaller lakes. Three levels of dynamic measurement constitute the three-dimensional "Swap - attenuation – fragmentation" dynamic evolution measurement system of lakes. To show its effectiveness, the dynamic measurement was applied to lakes in Jianghan Plain, the middle Yangtze region of China for a more detailed analysis of lakes from 1984 to 2014. In combination with spatial-temporal location characteristics of lakes, the hidden information in lake evolution in the past 30 years can be revealed.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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