DToF single photon avalanche Diode (SPAD) sensor technology is the core technology to realize the miniaturization, low cost and mass production of LiDAR in the future. It directly measures the flight time of photons and then converts them into the flight distance of photons. Compared with iToF, dToF can obtain the time and quantity of photons reflected back to the sensor mainly through simple analog-to-digital conversion of pixel pulse output, which reduces power consumption and computation. And by adjusting pulse frequency and energy, the measurement range can be further than iToF. DToF SPAD technology will become the mainstream technology of 3D detection in the future and the eye of intelligent unmanned system.
For national major engineering, aerospace, unmanned systems, consumer electronics applications such as demand for long-distance three-dimensional perception, xi 'an university of electronic science and technology zhang-ming zhu, professor yin-tang Yang team issued dToF SPAD laser radar sensor, single chip core SPAD photosensitive device used to finishing the ranging accuracy and precise distance measurement circuit, a variety of functions such as optimization and ambient light interference algorithm, has 32 * 32 * 4, super resolution of 30 FPS refresh rate, can be achieved under the 200 mw power 12 to 15 meters high accuracy over a long distance detection, It is the furthest dToF SPAD detection distance reported so far.
The dToF SPAD lidar sensor chip is in the charge of Professor Liu Maliang and jointly developed by Xidian University of Science and Technology and Ningbo Xinhui Technology Co., LTD., which is the first in China to achieve a breakthrough in the whole process of dToF SPAD lidar sensor without the participation of relevant foreign personnel.