In actual operation, the vibration directions of the upper and lower polarizers of the polarizing microscope should be orthogonal to each other, or the east-west or north-south directions, respectively consistent with the horizontal and vertical directions of the eyepiece reticle. Sometimes only one lower polarizer is used for observation, and the vibration direction of the lower polarizer must be determined, so the polarizer must be corrected during operation.
1. Detection of eyepiece reticle
It is necessary to check whether the reticle of the eyepiece is orthogonal and whether it is consistent with the vibration direction of the upper and lower polarizers. At the same time, choose a piece of biotite that has been completely cleaved, move it to the center of the eyepiece crosshair, and make the cleavage seam parallel to a thread of the crosshair, record the scale number of the stage, and then turn the stage to make the cleavage seam parallel to For the other crosshair, record the scale number of the objective stage, the difference between the two scale numbers is 90 degree , indicating that the crosshair is orthogonal.
2. Determination and correction of the vibration direction of the lower polarizer
3. Orthogonal correction of the upper and lower polarizers
Après la direction du polariseur inférieur est calibré, retirer la feuille, pousser le haut polariseur dans, et observer si le champ de vue est complètement noir, que is, si it est dans an extinction état. Si it est complètement noir, it signifie que les vibrations directions de la supérieure et inférieure polarisée lumières sont orthogonales à chaque autre. Autrement, le haut polariseur doit être corrigé, que is, turn the upper polarizer to make the field of view reach the darkest. When turning, the stop screw of the upper polarizer must be loosened first, and then tighted after calibration.
