I want to use the CH101 sensor to measure the height of the garbage in the trash can to detect whether the trash can is full. The length, width and height of the trash can are 42cm, 21cm, and 78cm respectively. The sensor will be placed 78cm directly above the trash can. After calculation , I need to make an Acoustic Housing with a horizontal angle of 30° and a vertical angle of 15°. How do I make this Acoustic Housing?