Modeling and analysis of the bending strain across the lever arm based on auto collimation

In the high-precision vector aeromagnetic survey, to ensure the carrier´s interference in the magnetic sensor is smaller, it requires the carrier´s attitude information to keep pace with the magnetic sensor. For the problem of the deformation of the lever arm between the carrier and the magnetic sensor, the way of auto collimation is used to measure bending strain across the lever arm. By studying the system model, and proposing a modeling method for the system to analyze, the relationship among the spot coordinates light position and mirror deflection angle are discussed. What´s more, to ensure that the system can work well, the working conditions of the finite size of the system are studied. The analysis results of this system model may provide theoretical basis for the development of the real system, with some guidance for the design of the system, the errors analysis and compensation.