scholarly journals A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis

Sensors ◽  
2013 ◽  
Vol 13 (1) ◽  
pp. 703-720 ◽  
Author(s):  
Aljaž Pogačnik ◽  
Tomaž Požar ◽  
Mitjan Kalin ◽  
Janez Možina
Keyword(s):  
Laser Interferometer ◽  
Deformation Analysis ◽  
Asperity Deformation

Deformation Analysis of Box Shape Injection Mouldings in Consideration of Moulding Process.

1993 ◽  
Vol 42 (475) ◽  
pp. 359-363
Author(s):  
Mitomo HIRAI ◽  
Tsuneo HIRAI ◽  
Tsutao KATAYAMA ◽  
Takeshi ISHIKAWA
Keyword(s):  
Deformation Analysis ◽  
Moulding Process

Deformation Analysis for Coal and Gas Outburst Cavity

2011 ◽  
Vol 121-126 ◽  
pp. 2607-2613
Author(s):  
Qian Ting Hu ◽  
Wen Bin Wu ◽  
Guo Qiang Cheng
Keyword(s):  
Damage Zone ◽  
Coal And Gas Outburst ◽  
Gas Content ◽  
Combination Method ◽  
Deformation Analysis ◽  
Failure Zone ◽  
Finite Element Code ◽  
Cavity Volume ◽  
Gas Emission ◽  
Gas Outburst

Outburst cavity formed during coal and gas outburst can be pear shaped, elliptical, or just like an irregularly elongated ellipsoid, its capacity is always smaller than the volume of ejected coal. And the gas emission quantity is almost 4 to 10 times as gas content in ejected coal. These are two different expressions of the same problem. To find the reasons for the decrease of outburst cavity volume and the increase of gas emission quantity per ton, by using the finite element code ANSYS, the damage zone and the failure zone of the outburst cavity were determined based on the static and dynamic combination method. In this paper, the reason for the decrease of the outburst volume was explained.

scholarly journals LIGO: the Laser Interferometer Gravitational-Wave Observatory

2009 ◽  
Vol 72 (7) ◽  
pp. 076901 ◽  
Author(s):  
B P Abbott ◽  
R Abbott ◽  
R Adhikari ◽  
P Ajith ◽  
B Allen ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Laser Interferometer

scholarly journals Analysis of errors in measuring displacement by a laser interferometer used as a feedback sensor precision lathe module feed drive

2021 ◽  
Vol 1889 (5) ◽  
pp. 052039
Author(s):  
A A Ignatiev ◽  
E A Sigitov ◽  
V A Dobryakov ◽  
S A Ignatiev ◽  
A A Kazinsky ◽  
...  
Keyword(s):  
Laser Interferometer ◽  
Feed Drive

scholarly journals Time-delay interferometry

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Massimo Tinto ◽  
Sanjeev V. Dhurandhar
Keyword(s):  
Time Delay ◽  
Laser Interferometer ◽  
Laser Light ◽  
Space Antenna ◽  
Phase Measurements ◽  
Laser Noise ◽  
Future Space ◽  
Laser Interferometer Space Antenna ◽  
Overall Performance ◽  
Mathematical Foundations

AbstractEqual-arm detectors of gravitational radiation allow phase measurements many orders of magnitude below the intrinsic phase stability of the laser injecting light into their arms. This is because the noise in the laser light is common to both arms, experiencing exactly the same delay, and thus cancels when it is differenced at the photo detector. In this situation, much lower level secondary noises then set the overall performance. If, however, the two arms have different lengths (as will necessarily be the case with space-borne interferometers), the laser noise experiences different delays in the two arms and will hence not directly cancel at the photo detector. To solve this problem, a technique involving heterodyne interferometry with unequal arm lengths and independent phase-difference readouts has been proposed. It relies on properly time-shifting and linearly combining independent Doppler measurements, and for this reason it has been called time-delay interferometry (TDI). This article provides an overview of the theory, mathematical foundations, and experimental aspects associated with the implementation of TDI. Although emphasis on the application of TDI to the Laser Interferometer Space Antenna mission appears throughout this article, TDI can be incorporated into the design of any future space-based mission aiming to search for gravitational waves via interferometric measurements. We have purposely left out all theoretical aspects that data analysts will need to account for when analyzing the TDI data combinations.

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