Abstract We introduce a two-dimensional tiltmeter based on a cylindrical pendulum body and an arc cylindrical plate; we theoretically analyze the arc cylindrical plate differential capacitor. The analysis shows that to improve the sensitivity of the tiltmeter, it is necessary to appropriately increase the radius, the height of the cylindrical pendulum body and the length of the hanger wire, and to reduce the central angle of the arc cylindrical plate and the distance between the moving plate and the fixed plate; to reduce the non-linearity of the tiltmeter, it is necessary to appropriately increase the radius of the cylindrical pendulum body and the distance between the moving plate and the fixed plate, and reduce the central angle of the arc cylindrical plate, the height of the cylindrical pendulum body, the length of the hanger wire. Based on the above principles, we select a set of typical parameters, and the theoretical calculation shows that the sensitivity of the tiltmeter is 0.028 5 V/(″), and the non-linearity is 0.001 2%.
