Linear array scanning brillouin scattering elastic imaging device

A linear array scanning Brillouin scattering elastic imaging device, comprising a signal generating system, a signal receiving system and an eight-channel spectrometer, wherein

• the signal generating system consists of a narrow linewidth continuous wave laser, a half-wave plate, a beam expander, a Y-direction scanning galvanometer, a microlens array, a pinhole array filter, a first plano-convex lens, a polarization beam splitter, a quarter-wave plate and a microscope objective;
• in the signal generating system, a laser beam emitted by the continuous wave laser passes through the half-wave plate, and then is expanded by the beam expander and reflected to the microlens array by the Y-direction scanning galvanometer;
• after passing through the pinhole array filter and being focused by the first plano-convex lens, the laser beam passes through the polarization beam splitter and the quarter-wave plate, and is incident on the microscope objective to form eight focused beams on a sample;
• the signal receiving system consists of the microscope objective, the quarter-wave plate, the polarization beam splitter and an eight-channel optical collimator array;
• in the signal receiving system, a plurality of backward Brillouin scattering signal beams excited by the eight focused beams at the sample pass through the microscope objective and the quarter-wave plate and are reflected by the polarization beam splitter, and reflected signal beams are focused to the eight-channel optical collimator array by a second plano-convex lens;
• each channel of the eight-channel spectrometer consists of an optical collimator, a convex lens, a scanning Fabry-Perot interferometer, a photomultiplier tube and an eight-channel photon collection card;
• a plurality of backward Brillouin scattering signal beams received by the signal receiving system enter the eight-channel spectrometer, and each beam enters different spectrometer channels according to different longitudinal positions;
• in each spectrometer channel, collimated signal beams output by the optical collimator are focused into the scanning Fabry-Perot interferometer through the convex lens, and the signal beams after frequency discrimination are detected by the photomultiplier tube;
• and the detected scattered signals are collected by the eight-channel photon collection card and stored in a computer for processing, and a collected Brillouin spectrum is displayed.