5 OpenSCAD 3D 测试装置

OpenSCAD 是一款免费提供的 CAD 工具，可以参数化生成 3D 模型，并将其导出以用于 3D 打印。本文档中使用的参数化 3D 测试装置可从 TI 获取。

这些实验中使用的 OpenSCAD 参数化设计如下所示：

TRANSDUCER_RADIUS=8.25;
PIPE_RADIUS=8.5;
PIPE_LENGTH=70;
CHANNEL_WIDTH=6;
CHANNEL_HEIGHT=12;
ULTRASONIC_ANGLE=35;
ULTRASONIC_LENGTH=60;

union(){
difference(){
    
    union(){
    	translate ([0, 0, -25]) 
        rotate([0, 0, 0])
   		cylinder (h = PIPE_LENGTH, r = PIPE_RADIUS);
                
        translate ([-(PIPE_RADIUS+9), .1, -14.9]) 
        rotate([0, ULTRASONIC_ANGLE, 0])
   		cylinder (h = ULTRASONIC_LENGTH, r = TRANSDUCER_RADIUS+2);
    }
    
union(){     
        translate ([-(CHANNEL_HEIGHT/2), -CHANNEL_WIDTH/2, -25]) 
        rotate([0, 0, 0])
   		cube ([CHANNEL_HEIGHT,CHANNEL_WIDTH,PIPE_LENGTH]);    
  
        translate ([-(PIPE_RADIUS+9), 0, -15]) 
        rotate([0, ULTRASONIC_ANGLE, 0])
   		cylinder (h = 150, r = TRANSDUCER_RADIUS);
    }
}
union(){
        translate ([-(CHANNEL_HEIGHT/2), -CHANNEL_WIDTH, -15]) 
        rotate([0, 0, 0])
   		cube ([CHANNEL_HEIGHT,CHANNEL_WIDTH/2,PIPE_LENGTH-20]);

        translate ([-(CHANNEL_HEIGHT/2), CHANNEL_WIDTH/2, -15]) 
        rotate([0, 0, 0])
   		cube ([CHANNEL_HEIGHT,CHANNEL_WIDTH/2,PIPE_LENGTH-20]);
    
}}