Abstract
High speed imaging with improved resolution and wide area scanning are the ultimate targets for designing a MEMS mirror based LiDAR. Simultaneous improvements of above parameters are critical and yet pose design tradeoff among system complexity, cost and compatibility. Here, we propose a high resolution LiDAR for wide area scanning with improved frame rate by allowing minimum design constrains. Extended area scanning is achieved by simplified transmitter design with off-the-shelf low cost optics such as a beam splitter cube and a plane mirror. In addition, an effective scanning strategy is applied to improve the imaging speed for the extended coverage area, which involves sub-pixel imaging of selectively and sequentially shined target areas. Then, a high resolution image can be reconstructed after merging all the sub-pixel values. The proposed architecture is experimentally demonstrated to reconstruct a high resolution image of 1020 × 500 pixels at the fast refresh rate of 20 fps in extended FoV 52° × 26°. The system is also characterized in terms of linearity of extended optical angles, intensity distribution of light beam profile at several angular positions, and quality of scanned objects in the high resolution reconstructed image.
Highlights
It is always interesting to see our surrounding in 3D view with enough resolution
It may be noted that CCD camera based light detection and ranging (LiDAR) is extensively investigated recently for 3D imaging due to its mature technology, high resolution pixels and low cost optical receiver [21], [22]
Each of the measured values are fitted by an equation y = a.x + b, where a indicates the slop of the fitted line and b provides a constant value
Summary
It is always interesting to see our surrounding in 3D view with enough resolution. Sensors typically play an important role to build such multi-dimensional scenario by acquiring different attributes of the target objects. Beside the optical scanning angle, the image frame rate and resolution are crucial performance parameters for the MEMS based LiDAR. It is necessary to consider both scanning angle and imaging seed to design a high resolution MEMS based LiDAR.
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