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3.5
Optical Specifications
3.5.1 Field of View
The field of view refers to the view angle of the ToF products. The T
OF sensor’s
aspect ratio is 4:3, typically the horizontal field of view is larger than the vertical field of
view. The DFOV (see figure below) is the angle subtended by the diagonal of the
camera sensor onto the center of the lens.
The definition of HFOV and VFOV can be exchanged, i. e. we can rotate the camera
sensor to have larger FOV at vertical direction.
Typical FOV of DCAM550 Series is 69°*51°, we can do FOV customization if the
customer requires, and reasonable NRE fee shall be charged.
3.5.2 Wavelength of the VCSEL
All our product are based on VCSEL laser. We have variety choices according to the
lens FOV and wavelength. The laser FOV must match to the lens FOV, and the wider
FOV products need stronger power, therefore higher power consumption. Even with
higher power supplied, the laser power per angle of the wider FOV product may be
reduced, so normally the maximum distance of wider FOV products is shorter than
narrower FOV products.
As for the wavelength, we have 850nm and 940nm laser selection. Because of the
silicon process
based ToF sensor, the ToF sensor’s QE of 850nm is much better than
it of 940nm. That means normally 850nm product can reach longer distance or the
same distance with lower power consumption;
But the 940nm wavelength has better performance under strong sunlight, especially
when the ambient light is stronger than 20K LUX.
Below are the laser choices we can provide, if you have other needs, please let us
know.
H69°, V51°--- 2W, 940nm
H110°, V85°--- 2W, 850nm
