Представлены результаты реализации высокочувствительного датчика токов наносекундного диапазона индукционного типа для измерения импульсов тока, протекающих на стержневом молниеприемнике. Проведен анализ современных достижений в области измерений слабых импульсных токов. Представлены результаты расчета датчика,
показано влияние паразитных параметров на вид переходной характеристики датчика. Описаны основные особенности конструкции. Приведены параметры созданного датчика и результаты калибровки.
Представлено результати реалізації високочутливого датчика струмів наносекундного діапазону індукційного типу
для детектування імпульсів струму, що протікають на стрижньовому блискавкоприймачі. Аналіз останніх досягнень
в галузі вимірювань слабких імпульсних струмів наведено. Представлено результати розрахунку датчика, показано
вплив паразитних параметрів на вигляд перехідної характеристики датчика. Зроблено опис основних особливостей
конструкції. Наведено параметри створеного датчика та результати калібрування.
Purpose. A current meter based on the principle of electromagnetic induction is designed to register the current flowing in the
rod lightning. The aim of the article is to describe the way of
increasing the sensitivity of the converter by means of their serial communication. Methodology. The recorded current is in
the nanosecond range. If compared with other methods, meters
based on the principle of electromagnetic induction have several
advantages, such as simplicity of construction, reliability, low
cost, no need in a power source, relatively high sensitivity. Creation of such a meter is necessary, because in some cases there
is no possibility to use a shunt. Transient properties of a meter
are determined by the number of turns and the constant of integration. Sensitivity is determined by measuring the number of
turns, the coil sectional area, the core material and the integration constant. For measuring the magnetic field pulses with a
rise time of 5 ns to 50 ns a meter has turns from 5 to 15. The
sensitivity of such a meter is low. When the number of turns is
increased, the output signal and the front increase. Earlier described dependencies were used to select the main parameters of
the converter. It was based on generally accepted and widely
known equivalent circuit. The experience of created earlier
pulse magnetic field meters was considered both for measuring
the magnetic fields, and large pulse current. Originality. Series
connection of converters has the property of a long line. The
level of the transient response of the meter is calculated. The
influence of parasitic parameters on the type of meter transient
response is examined. The shown construction was not previously described. Practical value. The results of meter implementation are given. The design peculiarities of the given measuring
instruments are shown.
