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Improving the measurements at CZ variation stations - methods and results |
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Janosek, M. (1), Butta, M.(1), Vlk, M. (2), Bayer, T. (2) |
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(1) Dept. of Measurement, CTU in Prague (2) Institute of Geophysics, Czech Acad.Sci. |
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In this presentation, we summarize the performance an ongoing development of instrumentation and data processing at two Czech variometric sites at Polom (PLM) and Kelcany (KEL). The Polom station has been running since 2017 and Kelcany since 2015, both employing low-noise, race-track fluxgate variometers of CTU's construction.
The underground station at KEL has an advantage of being at a passively stabilized temperature (+-5°C during a year), but suffers from neigbouring car traffic, creating large peaks in the data. We present a method, employing a gradiometric measurement and numerical calculations, how to sucessfully remove most of the car traffic signatures and improve our daily signal to noise ratio.
The PLM station is unique that it until now runs at ambient temperatures, i.e. no sensor or electronic heating is maintained (this years low extrema was -17°C). However, by having the instrument calibrated and knowing the temperature drifts and monitoring the sensor temperature, we are able to largely supress the temperature effects on the measurements. An ongoing development of the non-magnetic, RF based heating which is planned for the site will be also presented. |
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Measurements |
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