Confocal microscopic device capable of accurately measuring transverse and longitudinal acoustic phonon velocities of medium

Abstract

The confocal microscopic device capable of accurately measuring the transverse and longitudinal acoustic phonon velocities of the medium comprises a continuous laser, a three-dimensional translation stage and an F-P interferometer, a to-be-measured sample is placed on the upper side of the three-dimensional translation stage, and a measuring objective lens is arranged right above the to-be-measured sample; a lambda/2 wave plate, a polarizer, a light splitting plain film and a first reflecting mirror are sequentially arranged on one side of the continuous laser; and a confocal pinhole, a convergent lens, an analyzer, a rotary reflector and a second reflector are sequentially arranged on one side of the F-P interferometer. According to the invention, the angle between the incident light path and the scattered light path does not need to be changed in the measurement process, the acoustic phonon speed of the measured material is rapidly measured by dynamically switching the collected light paths, the in-situ property and accuracy of the measurement result are ensured, and the measurement efficiency is improved. The method has remarkable advantages in the aspects of measuring speed, measuring precision, measuring mode complexity and the like.

Description

Technical field [0001] The present invention belongs to the field of microspectral measurement technology, specifically relates to a confocal microscopy device that can accurately measure the lateral and longitudinal acoustic phonon velocity of the medium. Background [0002] The stiffness tensor of the material can be directly used to calculate a series of mechanical properties parameters such as the elastic modulus, shear modulus, poisson ratio of the material, etc., and the complete acquisition of the stiffness tensor of the material is of great significance for characterizing the mechanical properties of the material. The traditional measurement method is mainly calculated by measuring the stress-strain curve of the material, but this method has great limitations. First of all, contact measurement will lead to deformation of the plastic material, and in the process of measuring it, it is easy to introduce additional measurement errors, resulting in unstable measurement resul...

AI Technical Summary

Problems solved by technology

However, the existing Brillouin spectroscopy test methods generally use the combination of right-angle scattering and backscattering, which usually needs to rotate the direction of the illumination optical axis or collection optical axis, so that the system is in the backscattering configuration or right-angle scattering configuration. , and then detect the transverse acoustic phonon and longitudinal acoustic phonon velocity, therefore, in the measurement process, it is necessary to repeatedly rotate the optical path angle, which greatly increases the complexity of the measurement system and the measurement process

At the same time, rotating the optical path often brings a certain angle deviation, which makes it difficult to ensure the in-situ and accuracy of the right-angle scattering and backscattering measurement results

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