The working principle of ToF sensor : the sensor emits modulated pulsed infrared light, which is reflected after encountering an object. ToF sensor calculates the time difference or phase difference between light emission and reflection to convert the distance of the photographed scene to generate depth information; ToF sensor has the following The advantages:
(1) Low software complexity, simple design and application;
(2) Performs good in dark and strong light environments;
(3) Low power consumption
(4) Long detection distance;
ToF sensor can be divided into IToF and DToF according to the modulation method of the emitting light source. IToF is a way to obtain the distance by indirectly calculating the phase difference between the emitted light and the received light wave. Its downward subdivision can be divided into CW-IToF and PM- IToF; CW-IToF is based on sine wave modulation, while PM-IToF is based on square wave modulation, but they are all based on phase measurement to obtain depth information; for DToF, pulse waves are emitted by the light source and reflected on the object. The receiving end is a technology that records the flight time of the light pulse in this process, and then calculates the depth information of the scene based on the flight time.
