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Search Publications by: Bala Muralikrishnan (Fed)

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Displaying 1 - 25 of 170

A method to calibrate angular positioning errors using a laser tracker and a plane mirror

March 20, 2025
Author(s)
Balasubramanian Muralikrishnan, Katharine Shilling, Vincent Lee, Olga Ridzel, Glenn Holland, John Villarrubia
We describe a method to calibrate angular positioning errors of a rotation stage using a laser tracker (LT), a plane mirror mounted on the stage, and stationary registration nests placed around the stage. Our technique involves determining the direction of

Laser tracker and terrestrial laser scanner range error evaluation by stitching

May 7, 2024
Author(s)
Balasubramanian Muralikrishnan, Braden Czapla, Vincent Lee, Craig Shakarji, Daniel S. Sawyer, Saure Matthias
Laser trackers (LTs) are dimensional measurement instruments commonly employed in the manufacture and assembly of large structures. Terrestrial laser scanners (TLSs) are a related class of dimensional measurement instruments more commonly employed in

VDI/VDE 2634-2 and ISO 10360-13 Performance Evaluation Tests, and Systematic Errors in Structured Light Systems

April 29, 2024
Author(s)
Octavio Icasio Hernandez, Alex Rocha De La Cruz, Balasubramanian Muralikrishnan, Vincent Lee, Wei Ren, Jose-Joel Gonzalez-Barbosa
Structured light projection systems (SLSs) are commonly used for precision dimensional measurements. These are active systems in that the projected pattern is used to establish correspondence between the projector and the camera to provide more accurate 3D

Laser tracker interim testing per the ASME B89.4.19-2021 and ISO 10360-10:2021 standards

June 28, 2023
Author(s)
Marcos Motta de Souza, Bala Muralikrishnan, Vincent Lee, Daniel S. Sawyer
The recently revised ASME B89.4.19-2021 and ISO 10360-10:2021 standards for laser trackers include a new interim test that is comprehensive and more sensitive to systematic errors than the interim tests in the previous versions of the standards, i.e., the

X-ray Computed Tomography Instrument Performance Evaluation, Part III: Sensitivity to Detector Geometry and Rotation Stage Errors at Different Magnifications

September 29, 2021
Author(s)
Prashanth Jaganmohan, Bala Muralikrishnan, Meghan Shilling, Ed Morse
With steadily increasing use in dimensional metrology applications, especially for delicate parts and those with complex internal features, X-ray computed tomography (XCT) has transitioned from a medical imaging tool to an inspection tool in industrial

Performance Evaluation of Terrestrial Laser Scanners - A Review

January 27, 2021
Author(s)
Balasubramanian Muralikrishnan
Terrestrial laser scanners (TLSs) are increasingly used in several applications such as reverse engineering, digital reconstruction of historical monuments, geodesy and surveying, deformation monitoring of structures, forensic crime scene preservation

Performance evaluation of laser trackers using the network method

July 30, 2020
Author(s)
Ling Wang, Balasubramanian Muralikrishnan, Octavio Icasio Hernandez, Craig M. Shakarji, Daniel S. Sawyer
Due to their accuracy, portability, and large working volume, laser trackers (LTs) are widely used for dimensional metrology in a variety of large-scale manufacturing and assembly operations. Their performance evaluation is a key concern for users