Observation effect of polarizing stress meter

Polarization stress meterBLY-06 adopts a high-precision absolute angle encoder for measurement, with a measurement accuracy better than 2.0nm. The instrument has two experimental modes: qualitative and quantitative. Before qualitative measurement, it is necessary to place the full waveplate into the field of view by rotating the waveplate switching knob. Rotate the analyzer holder so that the numerical display window displays an angle of 0 (while the optical path difference is also displayed as 0). At this point, the field of view is observed through a polarizing mirror, and the field of view is purple red. When measuring quantitatively, it is necessary to rotate the waveplate switch knob to display the value at an angle of 0 (while also displaying the optical path difference as 0). At this point, observing the field of view through the analyzer reveals a dark field of view.

usePolarization stress meterBLY-06Observing the phenomenon of internal stress in colorless and transparent glass bottles is much simpler than observing and detecting internal stress in colored glass bottles. Recently, many laboratory users have consulted our technical engineers on how to observe and calculate internal stress in colored glass using a polarizing stress meter. Today we will briefly explain how to use a polarizing stress meter to detect the internal stress value of colored glass.

1、 Colored glass has blue and brown colors, but the transparency of the glass is still good. This observation method can refer to the detection method of colorless glass. The method is as follows: place a quarter wave plate in the field of view, adjust the zero point of the polarizing stress meter, and make it appear as a dark field of view. Place the test sample in the field of view, so that the axis of the test sample is at a 45 degree angle to the polarization plane. At this point, different areas of brightness and darkness appear on the sidewall. Rotate the analyzer until the dark area gathers on the side wall, just replacing the bright area. Rotate the test sample around the axis to determine the maximum stress zone. Record the placement angle of the polarizer in the maximum stress zone and measure the thickness of both walls separately (record the sum of the wall thicknesses on both sides).

2、 When the transmittance of colored glass is relatively low, it is difficult to determine the rotation endpoint of the analyzer when using a polarizing stress meter, especially for dark samples. In this case, the average method can be used to determine the accurate endpoint. The average value of the sum of the rotation angle of replacing the bright area with the dark area and the total rotation angle that causes the bright area to reappear.