Recently, Apple released a new iPad pro. The main hardware upgrade is not the 'Yuba double camera' behind it, but the dtof laser radar beside the camera. Therefore, iPad Pro has become the first platform of Apple's TOF technology.

Dtof lidar has more advantages in TOF Technology
In fact, the light detection and ranging on iPad pro and TOF camera on mobile phone belong to radar technology. They capture 3D images by time of flight. The main principle is to use the radar to transmit light waves, which will reflect when encountering an impenetrable object. By recording the time when the reflected light reaches the receiver, the distance between the light source and the object can be calculated quickly, and then a 3D image of the measured object can be obtained.
However, the light waves emitted by different radars are different, and the resolution and resolution of the image obtained are also different.
The TOF technology commonly used in mobile phones uses the radar wavelength, which also belongs to the infrared surface light source. The depth plane information is received, and the imaging accuracy is limited, so it is still unable to capture high-precision dynamic 3D images. The laser radar selected by iPad pro, which transmits pulse infrared laser, receives single point position, forms point cloud image and then turns into three-dimensional model, with higher accuracy.

▲ Principle of TOF camera

▲Distance and depth information map of objects obtained through TOF
In addition, there are two modulation methods for the light wave emitted by lidar: direct TOF measurement and indirect TOF measurement. Direct ranging is to determine the distance by transmitting and receiving light and measuring the photon flight time. Instead of direct ranging ITO F, it is to convert by measuring the phase difference between the transmitting and receiving waveforms, from The advantages of direct ranging are fast response, low power consumption and so on.
