ToF can be divided into iToF (indirect time of flight) and dToF (direct time of flight). The principle difference between dToF and iToF is mainly the difference between emitted and reflected light. The principle of dToF is relatively straightforward, that is, a light pulse is directly emitted, and then the time interval between the reflected light pulse and the emitted light pulse is measured, and the flight time of the light can be obtained.
The principle of iToF is more complicated.In iToF.what is emitted is not a light pulse, but modulated light. There is a phase difference between the received reflected modulated light and the emitted modulated light. By detecting the phase difference, the flight time can be measured and the distance can be estimated.
