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Measuring Repeatability of the Focus-variable Lenses
(Czech Technical University in Prague, 2014)
In the field of photogrammetry, the optical system, usually represented by the glass
lens, is used for metric purposes. Therefore, the aberration characteristics of such
a lens, inducing deviations from projective imaging, ...
Calibration of the 3D Coil System's Orthogonality
(IEEE, 2013)
Two methods were tested for calibration procedures of the 3D coil system which is used as a source part of the magnetic tracker. Precise magnetometer’s positions with respect to the coil system were used for determining ...
Magnetic Calibration System With Interference Compensation
(IEEE, 2019)
This paper describes a novel method for calibrating dc-precise magnetometers in the low field range (± 100 μT), which gives acceptable results even in laboratory conditions with significant magnetic interference. By ...
Calibration of unipolar high current impulses for resistance spot welding
(Czechoslovakia Section IEEE, 2020)
Requirement from practice is the need for quality and precise measurement of unipolar high current impulses, which are applied in resistance spot welding. The reason is the high dependence of weld quality on the shape and ...
A Reconfigurable Four Terminal-Pair Digitally Assisted and Fully Digital Impedance Ratio Bridge
(IEEE, 2018)
A reconfigurable digital bridge for calibrating four terminal-pair (4-TP) defined impedance standards in the whole complex impedance plane by means of fully digital (FD) operation of the bridge and for R-R, C-C calibration ...
Characterization of a precision modular sinewave generator
(IOP Publishing, 2020)
At the Czech Metrology Institute (CMI) we have developed a precision modular sinewave generator for impedance ratio bridges. The generator was developed to improve previously available designs regarding amplitude and phase ...
Estimation of Angular Deviations in Precise Magnetometers
(IEEE, 2019)
Capabilities for calibrations of angular deviations of sensor triplets in precise magnetometers were evaluated in a 2.5-meter, triaxial Helmholtz-coil facility. The coil system is located in a magnetically quiet environment ...
Determination of the Overhauser magnetometer uncertainty
(FEI, Slovak University of Technology, 2015)
Overhauser magnetometers are the basic instruments for scalar measurements; however, their accuracy is determined at the time of manufacture only. Because of various effects affecting the gyromagnetic ratio of the used ...
Precise calibration method for triaxial magnetometers not requiring Earth's field compensation
(IEEE, 2015)
A calibration procedure for calibrations of triaxial magnetometers is presented. The procedure uses a triaxial Helmholtz coil system and an Overhauser scalar magnetometer and is performed in the an Earth's field range. The ...