Content by David H. Parker
Subtle Sources of Error in Laser Trackers Due to Dispersion in the Internal Optical Elements Practical implications for electronic distance measurement
Wed, 05/20/2020 - 21:22
It is well known that the speed of light depends on the index of refraction of the medium in which the light is propagating. It is also well known that in a dispersive medium, the speed of an amplitude modulated wavefront depends on the group… Experimental Uncertainty Analysis for NDT on the CSX Wilbur BridgeElectronic distance measurements utilized to measure 3D coordinates of cardinal points
Tue, 04/23/2019 - 21:06
A 154-page report by Moreu and LaFave in 2012 explains unique problems railroad bridge engineers must contend with. The gross weight of cars went from 200,000 pounds to 263,000 pounds in the 1970s, and to 286,000 pounds in 1991. The ratio of live to… Using Electronic Distance Measurement Instruments in NDT and Structural Health-Monitoring Applications
Wed, 08/16/2017 - 16:23
Electronic distance measurement (EDM) instruments, such as laser trackers, total stations, and handheld laser distance meters, have been used in a limited number of nondestructive testing (NDT) and structural health monitoring (SHM) applications…
