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造岩矿物的光轴角是重要的光学常数之一,在2v较大时,可用旋转台直测法、贝瑞克法和扎瓦里茨基法测定。当2V很小时,可采用厚薄片锥光法和瓦尔丹年茨法。后者是瓦尔丹年茨1948年提出的测法。该法在我国各地质院校费氏台教材中都有介绍。由于其测法交待不确切、很繁琐,所以该法未能推广使用。现在我们将该法改进后,采用五轴法定位,直接测出2v的“8”字消光影的长短半径,用公式计算出2v值,一般不需投影作图。
The optical axis angle of rock-forming minerals is one of the important optical constants. When 2v is large, it can be measured by rotating table direct method, Berwick method and Zarvitz method. When 2V is very small, can be used thick slice cone method and Vardan Tan method. The latter is the method proposed by Valdarnienz in 1948. This law has been introduced in all Geological Institutions in China. Due to its measurement is not accurate, it is cumbersome, so the law failed to promote the use of. Now we will improve the law, the use of five-axis positioning, direct measurement of the 2v “8” the length of the extinction shadow radius, the formula used to calculate the 2v value, generally do not need projection mapping.