scholarly journals Laser heterodyne interferometer with rotational error compensation for precision displacement measurement

2018 ◽  
Vol 26 (1) ◽  
pp. 90 ◽  
Author(s):  
Enzheng Zhang ◽  
Benyong Chen ◽  
Hao Zheng ◽  
Liping Yan ◽  
Xueying Teng
Keyword(s):  
Error Compensation ◽  
Displacement Measurement ◽  
Heterodyne Interferometer ◽  
Rotational Error ◽  
Laser Heterodyne

scholarly journals CycleGAN for interpretable online EMT compensation

2021 ◽  
Author(s):  
Henry Krumb ◽  
Dhritimaan Das ◽  
Romol Chadda ◽  
Anirban Mukhopadhyay
Keyword(s):  
Error Compensation ◽  
Qualitative Assessment ◽  
Electromagnetic Tracking ◽  
Invasive Procedures ◽  
Phantom Experiment ◽  
X Ray ◽  
Reduce Radiation Exposure ◽  
Rotational Error ◽  
Clinical Reality ◽  
Compensation Approach

Abstract Purpose Electromagnetic tracking (EMT) can partially replace X-ray guidance in minimally invasive procedures, reducing radiation in the OR. However, in this hybrid setting, EMT is disturbed by metallic distortion caused by the X-ray device. We plan to make hybrid navigation clinical reality to reduce radiation exposure for patients and surgeons, by compensating EMT error. Methods Our online compensation strategy exploits cycle-consistent generative adversarial neural networks (CycleGAN). Positions are translated from various bedside environments to their bench equivalents, by adjusting their z-component. Domain-translated points are fine-tuned on the x–y plane to reduce error in the bench domain. We evaluate our compensation approach in a phantom experiment. Results Since the domain-translation approach maps distorted points to their laboratory equivalents, predictions are consistent among different C-arm environments. Error is successfully reduced in all evaluation environments. Our qualitative phantom experiment demonstrates that our approach generalizes well to an unseen C-arm environment. Conclusion Adversarial, cycle-consistent training is an explicable, consistent and thus interpretable approach for online error compensation. Qualitative assessment of EMT error compensation gives a glimpse to the potential of our method for rotational error compensation.

scholarly journals Laser heterodyne interferometer for simultaneous measuring displacement and angle based on the Faraday effect

2014 ◽  
Vol 22 (21) ◽  
pp. 25587 ◽  
Author(s):  
Enzheng Zhang ◽  
Qun Hao ◽  
Benyong Chen ◽  
Liping Yan ◽  
Yanna Liu
Keyword(s):  
Faraday Effect ◽  
Heterodyne Interferometer ◽  
Laser Heterodyne ◽  
Simultaneous Measuring

19-picometer mechanical step displacement measurement using heterodyne interferometer with phase-locked loop and piezoelectric driving flexure-stage

2020 ◽  
Vol 304 ◽  
pp. 111880 ◽  
Author(s):  
Thanh Dong Nguyen ◽  
Quang Anh Duong ◽  
Masato Higuchi ◽  
Thanh Tung Vu ◽  
Dong Wei ◽  
...  
Keyword(s):  
Phase Locked Loop ◽  
Displacement Measurement ◽  
Heterodyne Interferometer

A Two-Color Heterodyne Interferometer Based on Diffraction Grating for Displacement Measurement

2005 ◽  
Vol 295-296 ◽  
pp. 189-194 ◽  
Author(s):  
G.H. Wu ◽  
Z.J. Cai ◽  
Li Jiang Zeng
Keyword(s):  
Diffraction Grating ◽  
High Accuracy ◽  
Displacement Measurement ◽  
Optical Diffraction ◽  
Fringe Order ◽  
Heterodyne Interferometer

A two-color heterodyne interferometer based on the movement of the optical diffraction grating is proposed. The method allows us to measure the phase of synthetic wavelength f s directly and with high accuracy to extend the range of unambiguity for interferometric measurements by using two close wavelengths. Our experiment results show that the uncertainty in displacement measurement caused by the uncertainty in f s is 0.20 µm, smaller than the half of a single wavelength we used. The fringe order of a single wavelength can be determined without ambiguity. The uncertainty in displacement measurement can be improved further by using a single wavelength.

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