Abstract
Time-dependent numerical simulation of diffraction and absorption effects in diagnostics of short high-power microwave pulses using wide-aperture liquid calorimeters
Highlights
To measure the energy of high-power microwave pulses, calorimeters with disc-shaped wide-aperture absorbing loads filled with a working liquid based on ethanol are used [1, 2]
In experiments [3, 4] it was found that the measured shape of the microwave signal depends on the registration point and can differ significantly from the observed in the absence of a calorimeter
The modeling demonstrated that, depending on the position of the registration point, the shape of the recorded pulse undergoes a distortion compared to that measured in the neck of the horn antenna, both because of the diffractive rounding of the calorimeter load by the electromagnetic wave, and because of the effect of frequencydependent spatial attenuation of the wave passing through the load
Summary
To measure the energy of high-power microwave pulses, calorimeters with disc-shaped wide-aperture absorbing loads filled with a working liquid based on ethanol are used [1, 2]. Their principle of operation is based on an increase in the volume of the liquid due to the absorption of the energy of the microwave pulse. The modeling demonstrated that, depending on the position of the registration point, the shape of the recorded pulse undergoes a distortion compared to that measured in the neck of the horn antenna, both because of the diffractive rounding of the calorimeter load by the electromagnetic wave, and because of the effect of frequencydependent spatial attenuation of the wave passing through the load.
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