GB/T 7896-2008Test method for optical grade synthetic quartz crystal (English PDF)

3.1 Artificial optical crystal and the seed crystal size

Use accuracy of 0.02mm vernier caliper measurement of each dimension of artificial quartz crystal.

3.2 Artificial optical crystal orientation of the seed crystal

Artificial optical crystal orientation of the seed crystal X-ray direction finder should be used for testing.

3.2.1 instruments and appliances

X-ray direction finder, directional accuracy ± 30 ".

3.2.2 Test procedure

Directional instrument calibration, respectively, adjusted to the appropriate counter tube angle (2theta), the corresponding standard sheet discharge to the sample stage, and adsorption using a vacuum pump,

Shake the hand wheel forward or backward to find the peak, the display angle theta can be. The test sample is placed in a sample seed stage, measured three times.

3.2.3 Results

Calculate the average of three measurements.

3.3 rotation

3.3.1 original crystal according to FIG

1 rotation determination.

Figure 1 optical rotation synthetic quartz crystal 3.3.2 When the crystal plane is destroyed, discrimination method shown in Table 1.

Table 1 instruments discrimination crystal rotation method

L-D-measuring instruments quartz crystal

The cone of light polarization analyzer was contractile ring (eyepiece clockwise rotation) diverge ring (eyepiece clockwise rotation)

Polariscope polariser polarizer is rotated counterclockwise rotate clockwise […]