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This paper describes the principle, structure and the self-calibration method of a new type of current comparator which is designed and constructed by NIM. This current comparator is based on “shield guiding structure”, and its ratio is from 0.1∶1 to 1∶1.
This paper introduces a calibration method for measuring the Miniature Current Transformer (MCT) which is based on sampling technology. In this way, we can measure the miniature current transformer with secondary current from 1mA to 100mA and different load accurately.
An improved two terminal-pair coaxial AC bridge with auto source balance is constructed at NIM for high precision capacitance measurement. The errors introduced by auto source balance in the bridge are at negligible level. The bridge can disseminate the calculable capacitance to 1 pF, and transmit capacitance from 1 pF to 10000 pF. A minimum standard uncertainty 7.7 × 10−9 is achieved at 1592 Hz.
Multichannel synthetic aperture radar (SAR) systems in azimuth can achieve high-resolution and wide-swath imaging. However, the quality of final SAR image can be degraded by the channel mismatch in phase which increases the energy outside the processed Doppler bandwidth (PDB). To address this problem, a calibration algorithm is proposed in this letter by minimizing the energy outside the PDB. Theoretical...
In this paper an improved bootstrap method used for the calibration of inductive voltage dividers(IVDs) is described which uses a special constructed reference transformer to decrease the system errors due to the screen current. The reference transformer is wound with a triaxial cable which was divided into two equal lengths by a break in the both of the outers. A initial measurement result shows...
Bayesian linear classifier is the basic scheme to solve model classification basing on statistics. Face with the classification of three different nectar plant, the near infrared spectrum data was acquired. The character of the near infrared spectrums is known as litter sample and higher dimension. In this paper, the method has developed to acquire the feature wavelength based on genetic algorithm...
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