FIELD: measurement technology, various branches of industry and control over environmental parameters. SUBSTANCE: system establishing lateral stress includes light source, beam splitter, optical fiber connected to beam splitter and incorporating diffraction grating on which lateral stress acts and detector measuring spectral interval between two maxima of spectral intensity of optical beam reflected from diffraction grating and generating output signal showing lateral stress in optical fiber. Spectral interval between two maxima changes under action of lateral stress applied to diffraction grating. In compliance with second variant detector generates output signal demonstrating lateral stress applied to optical fiber across first optical diffraction grating. According to third variant diffraction grating in system establishing pressure is built on birefringence fiber. In correspondence with fourth variant first optical diffraction grating transmits part of light beam fed into optical fiber from radiation source. EFFECT: widened functional potential thanks to possibility of measurement of gradients of lateral deformation, pressure and temperature over entire length of optical fiber by detector showing lateral deformation. 25 cl, 20 dwg
