The basic principle of ToF is to transmit a modulated light pulse through an infrared transmitter. After encountering an object reflection, the receiver receives the reflected light pulse, and calculates the distance to the object based on the round-trip time of the light pulse. This kind of modulation method has higher requirements for the transmitter and receiver, the speed of light is so fast, and it has extremely high precision requirements for time measurement.
Early ToF sensor high cost, so it is mostly used in the industrial field.In recent years, breakthroughs in integrated circuit and sensor technology have made it possible to measure the phase of light pulses on CMOS chips.tof accuracy is getting higher and the cost is lower.It is widely used in AR & VR and drones, smart home, medical, industrial, etc.
DOMI current smallest ToF module DMOM2501A, the entire tof module (including sensor, lens IR transmitter and circuit) size is 21.60mm * 9.10mm * 5.40mm. It has smaller form factor than previous chips.