The assembly precision of the displacement sensor directly determines the measurement accuracy， and an auxiliary calibration system is crucial for achieving precise assembly. This study analyzed the spatial modulation function of the output signal and the assembly relationship based on the structural features and measurement principles of light field time-grid sensors. It proposed an auxiliary assembly calibration system that utilizes the measured signal of the sensor as an installation index. By considering the measurement principle of light field time-grid sensors and studying their influence on installation error， particularly in relation to roll angle calibration， a mathematical model related to the measurement signal was established. Subsequently， an auxiliary assembly calibration system was designed based on this model using original measurement signals to obtain calibration indicators. Experimental results demonstrate that this system provides intuitive roll angle calibration parameters， enabling users to calibrate effectively and reduce original errors in light field time-grid sensors to within ±1.3 μm with simple linkage and easy integration.