polarizing microscopeEquipped with accessories such as polarizer and analyzer. The light emitted by the light source becomes linearly polarized light after passing through the polarizer. If the object being inspected is an isotropic birefringent object, no matter how the stage is rotated, the direction of polarized light vibration remains unchanged, perpendicular to the direction of the polarizer vibration, and the field of view remains dark; If the object being inspected is an anisotropic body with birefringence, linearly polarized light will produce two types of linearly polarized light with different vibration directions after entering. One of the beams of light is not orthogonal to the polarization direction of the analyzer and can pass through the analyzer to brighten the field of view. When a birefringent object rotates on a stage, there will be four changes in brightness and darkness.

　　polarizing microscopeThrough the interaction between polarized light and the sample, the following functions are achieved:

Birefringence detection: Distinguishing between single refractive (isotropic) and birefringent (anisotropic) materials. For example, crystals can change the direction of polarized light due to differences in internal structural symmetry, resulting in interference patterns or extinction phenomena.

Observation of color rendering properties: Samples exhibit different colors under different polarization states, providing rich information. If biotite appears dark brown or light yellow under polarized light, it can be used to determine the direction of polarizer vibration.

Microstructure analysis: By observing polarized images, reveal the crystal structure, phase transition process, lattice defects, and fiber orientation of the sample. For example, in materials science, the microstructure of metals, ceramics, and polymers can be analyzed to guide material preparation and performance optimization.