Výsledky vyhledávání - "Prem K. Rachakonda"

Metrological evaluation of contrast target center algorithm for terrestrial laser scanners

Autor: Balasubramanian Muralikrishnan, Prem K. Rachakonda, Daniel S. Sawyer

Publikováno v: Measurement. 134:15-24

Terrestrial Laser Scanners (TLSs) are used in a variety of large scale scanning applications such as reverse engineering, assembly of aircraft or ships and surveying. Contrast targets are used with such instruments for enabling scene registration or

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e68d95afce62f5ddbcd48368af86c9c0
https://doi.org/10.1016/j.measurement.2018.08.039

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Terrestrial laser scanner geometric error model parameter correlations in the Two-face, Length-consistency, and Network methods of self-calibration

Autor: Daniel S. Sawyer, Prem K. Rachakonda, Balasubramanian Muralikrishnan, Ling Wang

Publikováno v: Precision Engineering. 52:15-29

Terrestrial laser scanners (TLSs) are increasingly used in a variety of applications where accuracies on the order of few tenths of a millimeter or smaller are routinely demanded. Self-calibration is a quick and cost-effective way to improve the accu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0985b27d2a4d72c90a760704d1b0a095
https://doi.org/10.1016/j.precisioneng.2017.08.004

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Sources of errors in structured light 3D scanners

Autor: Balasubramanian Muralikrishnan, Daniel S. Sawyer, Prem K. Rachakonda

Publikováno v: Dimensional Optical Metrology and Inspection for Practical Applications VIII.

Structured light scanners have been commercially available for over a decade and some commercial scanners are evaluated using one of two German guidelines – VDI/VDE 2634 parts 2 and/or 3. Several other research groups have developed physical artifa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bc5afd9c319106f752302bee8ab66c5f
https://doi.org/10.1117/12.2518126

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A first realization of ASTM E3125-17 test procedures for laser scanner performance evaluation

Autor: Bala Muralikrishnan, Vincent D. Lee, Ling Wang, Prem K. Rachakonda, Joe Gleason, Daniel S. Sawyer

Publikováno v: Measurement. 153:107398

Spherical coordinate three-dimensional (3D) imaging systems, such as Terrestrial Laser Scanners (TLS), are already used widely in different fields. Their measurement performance evaluation is a topic of active research. In 2017, the first comprehensi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1de6fda02d1895820f1f944db323341d
https://doi.org/10.1016/j.measurement.2019.107398

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Methods to calibrate a three-sphere scale bar for laser scanner performance evaluation per the ASTM E3125-17

Autor: Prem K. Rachakonda, Daniel S. Sawyer, Joe Gleason, Ling Wang, Bala Muralikrishnan, Vincent D. Lee

Publikováno v: Measurement. 152:107274

A scale bar with sphere targets is one way of realizing the symmetric and asymmetric length tests to evaluate Terrestrial Laser Scanner (TLS) performance per the ASTM E3125-17 standard. The length of the scale bar is required to be known with an expa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::42dc0a4f36d6c8c5922b4a8c744d06d5
https://doi.org/10.1016/j.measurement.2019.107274

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Toward the development of a documentary standard for derived-point to derived-point distance performance evaluation of spherical coordinate 3D imaging systems

Autor: Meghan Shilling, Wei Ren, Bala Muralikrishnan, Daniel S. Sawyer, Vincent D. Lee, Prem K. Rachakonda

Publikováno v: Journal of Manufacturing Systems. 37:550-557

This paper describes ongoing research work at the National Institute of Standards and Technology (NIST) in support of the development of a documentary standard for derived-point to derived-point distance performance evaluation of spherical coordinate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a0c5b6bff85dac864f4d49baefa5e17e
https://doi.org/10.1016/j.jmsy.2015.04.002

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Methods and considerations to determine sphere center from terrestrial laser scanner point cloud data

Autor: Luc Cournoyer, Prem K. Rachakonda, Bala Muralikrishnan, Geraldine S. Cheok, Meghan Shilling, Daniel S. Sawyer, Vincent D. Lee

The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) is performing research to support the development of documentary standards within ASTM E57 committee. This committee is addressing the point-to-point p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd7ce7f2e23e67959bfce570c763b156
https://nrc-publications.canada.ca/eng/view/object/?id=3f856b36-a2cf-4f99-b40c-a7671845ad42

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In-situ Temperature Calibration Capability for Dimensional Metrology

Autor: Daniel S. Sawyer, Christopher J. Blackburn, Balasubramanian Muralikrishnan, Gregory F. Strouse, Prem K. Rachakonda, Steven D. Phillips, Craig M. Shakarji

Publikováno v: NCSLI Measure. 9:40-45

The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) has developed a new in-situ temperature calibration system. This paper discusses the system compon...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::03e9eb1aef4c04ed15645ac7bdefbe91
https://doi.org/10.1080/19315775.2014.11721704

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