传感器原理传感器原理 (33).ppt

《传感器原理传感器原理 (33).ppt》由会员分享，可在线阅读，更多相关《传感器原理传感器原理 (33).ppt（6页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、Principle of Sensors传感器原理压电式传感器Inductive Sensors 6.2.1 石英晶体的切型及符号 Shapes and Symbols of Quartz Crystals 石英晶体的切型及符号石英晶体的切型及符号石英晶体的切型及符号石英晶体的切型及符号Shapes and Symbols of Quartz Crystals Shapes and Symbols of Quartz Crystals 石英晶体最常用的切型有二种：石英晶体最常用的切型有二种：石英晶体最常用的切型有二种：石英晶体最常用的切型有二种：x x切和切和切和切和y y切。切。切。切。Th

2、ere are two most commonly used cutting types of quartz There are two most commonly used cutting types of quartz crystals:x-cutting and y-cutting.crystals:x-cutting and y-cutting.切型：在晶体坐标中取某种方位的切割。Cutting:Cutting in a certain orientation in crystal 符号表示方法主要有符号表示方法主要有符号表示方法主要有符号表示方法主要有Symbolic represe

3、ntation methods mainly includeSymbolic representation methods mainly includeIREIRE符号表示法：是一种以厚度取向为切型的表示法。符号表示法：是一种以厚度取向为切型的表示法。符号表示法：是一种以厚度取向为切型的表示法。符号表示法：是一种以厚度取向为切型的表示法。IRE Symbolic Notation:It is a notation with thickness orientation as tangent type.IRE Symbolic Notation:It is a notation with thic

4、kness orientation as tangent type.用X、Y、Z中任意两个字母的先后排列顺序，表示石英晶片厚度和长度的原始方向；用字母t（厚度）、l（长度）、b（宽度）表示旋转轴的位置。旋转角度：当角度为正时,表示逆时针旋转；当角度为负时,表示顺时针旋转。The original direction of thickness and length of quartz wafer is expressed by the sequence of any two letters in X,Y and Z;Use the letters t(thickness),l(length)an

5、d b(width)to indicate the position of the rotation axis.Rotation angle:When the angle is positive,it means counterclockwise rotation;When the angle is negative,it means clockwise rotation.1、IRE标准规定的切型符号表示法 Symbolic representation of cut type specified in IRE standard;2、习惯符号表示法 Habitual symbolic repr

6、esentation.例：例：例：例：(YXl)35切型，含义：第一个字母Y表示石英晶片在原始位置(即旋转前的位置)时的厚度沿Y轴方向，第二个字母X表示石英晶片在原始位置时的长度沿X轴方向，第三个字母l和角度35表示石英晶片绕长度逆时针旋转35，如图。Example:Example:(YXl)35 cut type,meaning:the first letter Y indicates the thickness of the quartz wafer in the original position(i.e.the position before rotation)along the Y

7、axis,the second letter X indicates the length of the quartz wafer in the original position along the X axis,and the third letter l and angle 35 indicate that the quartz wafer rotates counterclockwise about the length 35,as shown in the figure.例：例：例：例：（XYtl）5/-50切型，含义：表示石英晶片原始位置的厚度沿X轴方向，长度沿Y轴方向，先绕厚度t

8、逆时针旋转5，再绕长度l顺时针旋转50，如图。Example:Example:(XYtl)5/-50 cut type,meaning:means that the thickness of the original position of the quartz wafer is along the X-axis direction and the length is along the Y-axis direction,first rotating 5 counterclockwise around the thickness t,and then rotating 50 clockwise around the length l,as shown in the figure.