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Today, the strengths of electric fields over thunderstorm clouds and their spatiotemporal structure are measured with the use of either sensing balloons or drones. Such techniques are inefficient and quite expensive. At the same time, the parameters of these electric fields are of great importance for geophysics. In this work, we consider the possibility of using the Kerr effect in the remote sensing of electric fields.

We propose and describe the use of a system with PT-symmetry properties in resonator optical gyroscopes. It is shown that this makes it possible to increase the limiting sensitivity and does not introduce disadvantages typical of PT-symmetric laser gyroscopes. In the example considered in the paper, the inclusion of a system with PT-symmetry properties in the composition of a resonator optical gyroscope allows one to increase the limiting sensitivity by a factor of 750.

The paper considers the construction of a piezoelectric accelerometer capable of measuring constant linear acceleration. A number of designs are proposed that make it possible to achieve high sensitivity with small dimensions and a wide frequency band (from 10−5 Hz). The finite element model of the proposed design was investigated, and its output characteristic and scale factor (36 mV/g) were obtained.