Measurement of slight angle of ship board dynamic platform based on bi-Fresnel prisms

Ocean space tracking ship will produce dynamic elastic deformation due to many factors such as solar radiation, mechanical vibration, shock waves and so on, which can affect the measurement accuracy of shipboard mesurement equipments. So investigating the slight angle measurement system of shipboard dynamic platform has practical significance. In order to resolve this problem, the noncontact small angle optical measurement technology with high accuracy and measurement resolution is selected, and a setup based on a unique Fresnel double-prism and a high- resolution CCD camera is proposed. Using image processing technology the measurement accuracy of the system can be improved. The setup we proposed here is compact, easy to install, with good reliability and high precision, which has important reference value on the designing of second-class angle measurement system of the ability to detect angle smaller than one second.