1) “Compact Precision Laser Inclinometer, an innovative instrument for angular microseismic stabilization of interferometric gravitational-wave antennas”.

Methods to reduce the overall size of the Precision Laser Inclinometer (PLI) for its application in the small-size vacuum chambers of sensitive elements of gravitational-wave antennas were developed. It was shown that the position sensitive method, a divider plate method for detection of angular inclinations of the PLI laser beams, allowed reducing the PLI overall size to a cube of 11x11x11 cm or a cylinder 15 cm in diameter and 11 cm in height, which simultaneously increased the detection sensitivity for angular inclinations of the Earth’s surface by a factor of 1.9.

2) “Methods creating the thermal resistivity of the small-size Precision Laser Inclinometer”.

To increase the thermal resistivity of the PLI, substantial design changes were elaborated and implemented. It was demonstrated that the proposed methods of increasing the thermal resistivity ensured the long-term sensitivity of 2.8·10-11 rad at allowable ambient temperature changes of ±0.1°С.