There are different types of 3D sensors, that can differ between different methods to acquire world data or how that data is processed in order to represent it in a convenient way.
These sensors can vary in many ways such as acquisition method, resolution, range, etc. One of our team members has put together a page with an overview of the different 3D sensor types and a small survey of what sensors are currently available.
Click here to see our overview of depth cameras in the market