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The paper considers schemes of pneumatic regulators, which operation principle is based on the jet force action effect on the flat plate. The main nodes of such regulators include the plate support and the compensatory circuit of the regenerative feedback forming the basis for building pneumatic control circuits that implement the basic laws of regulation. The proposed devices are able to improve static characteristics due to their linearity. Schemes are provided of aerostatic bearing, regenerative feedback, jet-pneumatic proportional and proportional-integral controllers, precession and differentiation block, proportional integral differential controller and semi-proportional controller.

The use of the aerodynamic jet force action effect became widespread in designing the automatic sensors for physical and technical parameters of gases and liquids, converters and control devices. This technical solution provides high sensitivity and accuracy of the measured parameters in the rapidly changing processes increasing the speed of work. Introduction of sensors built on the basis of such technical solution is especially important in the automated control systems for fast technological processes, where control over various parameters should be quick and accurate. The paper considers a jet pneumatic optical pressure transducer based on the jet force action effect on a plate, which dimensions are commensurate with those for the jet cross section. Static and dynamic characteristics of the pneumatic optical transducer were determined, where the cumulative parameters were accepted as the quality factor criterion combining the measurements sensitivity with the natural frequency square. Using this criterion, optimal parameters of the sensing element were derived based on the considered aerodynamic effect.

We analyse the electric field transverse distributions in light beams with a tripled frequency and with a frequency of 2ω1–ω2, which arise in the bulk of an isotropic cubic-nonlinear medium upon the propagation of nonuniformly polarised beams of fundamental radiation with a multimode transverse structure described by a superposition of Laguerre – Gaussian modes. A relation is found between the total topological indices of the circular polarisation singularity points in the transverse sections of the generated signal beams and the corresponding total indices in the beams of fundamental radiation.