Real-time wide-field spectral-scanning FMCW coherent 3D imaging and velocimetry
Jingkai Zhang, Ruobing Qian, Kevin C. Zhou, Christian Viehland, Mark Draelos, Al-Hafeez Dhalla, Joseph A. Izatt
Abstract
We present a real-time spectral-scanning frequency-modulated continuous wave (FMCW) 3D imaging and velocimetry system that can produce 3D depth maps at 33 Hz, with 48° × 68° field of view (FOV) and 32.8-cm depth range. Each depth map consists of 507 × 500 pixels, with 0.095° × 0.14° angular resolution and 2.82-mm depth resolution. The system employs a grating for beam steering and a telescope for angular FOV magnification. Quantitative depth, reflectivity, and axial velocity measurements of a static 3D printed depth variation target and a moving robotic arm are demonstrated.
Topics & Concepts
OpticsVelocimetryMagnificationDepth of fieldField of viewPhysicsImage resolutionAngular resolution (graph drawing)GratingSpectral resolutionSpectral lineMathematicsAstronomyCombinatoricsAdvanced Optical Sensing TechnologiesOptical measurement and interference techniquesOptical Coherence Tomography Applications