Angle measurement device and method

An angle measurement device for measuring an incident angle of an incident light ray, comprising:

• one or more light deflectors which is of a transmission type and has an electro-optic effect;
• a driving power supply configured to apply a voltage to the one or more light deflectors;
• one or more light receivers;
• and
• a processor, wherein the one or more light deflectors is configured to change an optical path of the incident light ray by the voltage applied from the driving power supply, so as to cause the incident light ray to enter the one or more light receivers, and wherein the processor is configured to calculate the incident angle based on the voltage at which an intensity of the incident light ray detected by the one or more light receivers is maximum.