22 May 2015 2D MEMS scanning LIDAR with sub-Nyquist sampling, set-up and functionality
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Abstract
2D-MEMS scanners for the deflection of Laser light in two directions are used to illuminate a measurement volume within 40° in horizontal and vertical direction. This solid angle of about 0.02 is scanned by a 658nm Laser beam with a maximum repetition rate of 350MHz digital pulses with an intensity of about 50mW. Reflected light is detected through an objective by an APD with a bandwidth of 80MHz. The phase difference between the scanned Laser light and the light reflected from an object is analyzed by sub-Nyquist sampling allowing the calculation of its distance and velocity. Presently, the achieved accuracy of the system is between 5mm and 10mm and the measurement range is about 2m. The experimental set-up of the Lidar system is presented in detail and first measurements demonstrating the capability of the system are discussed.
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Joachim Janes, Joachim Janes, Thorsten Giese, Thorsten Giese, } "2D MEMS scanning LIDAR with sub-Nyquist sampling, set-up and functionality", Proc. SPIE 9495, Three-Dimensional Imaging, Visualization, and Display 2015, 94950S (22 May 2015); doi: 10.1117/12.2175855; https://doi.org/10.1117/12.2175855
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