Modeling of optical-acoustic detectors with cylindrical resonators of variable cross-section

The results of a numerical study of the characteristics of a resonant optical-acoustic detector (OAD) with two coupled cylindrical resonators of variable cross-section using a dynamic model are presented. The dependences of the pressure amplitude in the center of the resonator (where the antinode of the standing acoustic wave is located) are obtained, and it is shown that an increase in the resonator cross-section in the region of the antinode of the acoustic wave relative to their initial cross-section leads to an increase in pressure in this region, which can be used to increase the sensitivity of the OAD. It is also shown that the sensitivity estimates obtained using the widely used analytical formula for calculating the sensitivity of resonant OAD are fundamentally different from the results of calculations of the dynamic model for OAD with resonators of variable cross-section. This indicates that the analytical expression is inapplicable for assessing the sensitivity of resonant OADs with resonators of variable cross-section.