Високочутливий радіовимірювальний прилад індукції магнітного поля на основі реактивних властивостей транзисторних структур

Abstract

In the dissertation work the results of researches which are directed on increase of sensitivity of measurement of induction of a magnetic field are stated. The analysis of the current state of development of radiomeasuring devices of a magnetic field which in the structure use various sensors and schemes of transfor-mations of measuring value into other measuring values is carried out. The most optimal for practical implementation is the frequency method of measuring the induction of the magnetic field based on the dependence of the reactive properties of semiconductor structures with differential resistance on the induction of the magnetic field. Devices based on this method increase the sensitivity. Mathematical models of radiomeasuring frequency converters, which are the main components of magnetic radiomeasuring devices of magnetic field induction, have been improved. They mainly determine the sensitivity of the radio measuring device of magnetic field induction on transistor structures with differential resistance. Their theoretical transformation functions and sensitivity equations were obtained. Three different circuits was conducted: the first - a Hall sensor with a frequen-cy converter based on two bipolar and one field-effect transistors; the second is a two-collector bipolar magnetotransistor with frequency converters based on two bipo-lar and one field-effect transistors; third - two-collector bipolar magnetotransistor with frequency converters based on three bipolar transistors.For the developed device the systematic component of the main error was cal-culated, which takes into account the error of temperature instability of capacity, er-ror of deviation of power supply parameters, temperature dependence, intrinsic insta- 22 bility, frequency meter error, quantization error, bit error. The limit value of the sys-tematic component of the main error is the value: ± 3 ± 0.75%.