Features of circuitry of acousto-optic laser measuring systems for controlling three-coordinate (3D) movements of products and equipment elements. Part 2

Abstract

The article discusses the noise, dynamic and accuracy parameters of acousto-optical (AO) laser measuring systems (LMS) for high-precision control of three-coordinate (3D) displacements of products. It is shown that now when using modern high-speed low-noise photodetectors makes it possible to achieve the resolution of AO LMS without special technical techniques  and  for longitudinal Δl_x and transverse Δl_y, Δl_z displacements, respectively, where λ and Λ_aom are the wavelength of light and sound in the AO modulator. The features of using PLL systems in AO LMS are discussed. The possibilities of increasing the resolution when measuring displacements using two photodetectors for one input optical signal: high-speed and low-noise, as well as by controlling the bandwidth of the PLL system are considered.