Abstract: This invention discloses a method for measurement and 3D reconstruction of precipitation particles based on orthogonal dual-view imaging. An orthogonal 3D sampling space are formed by a pair of line camera and continuum light source, two pairs of planar cameras and pulse light sources placed orthogonally. The line camera scans with a speed no less than 20,000 lines per second, two cameras and pulse light sources are triggered when the line camera detects the particles in sampling area, two orthogonal images are recorded by two planar cameras using the double-exposure or multiple-exposure in one frame. The 3D images of particles are obtained by pixel matching and grid reconstruction method, based on which the 3D sizes, axis ratio, orientation, fall velocity, and other characteristics of particles are calculated. This method can measure the 3D micro-physical characteristics of precipitation particles automatically and precisely.

Abstract: This invention discloses a method for measurement and 3D reconstruction of precipitation particles based on orthogonal dual-view imaging. An orthogonal 3D sampling space are formed by a pair of line camera and continuum light source, two pairs of planar cameras and pulse light sources placed orthogonally. The line camera scans with a speed no less than 20,000 lines per second, two cameras and pulse light sources are triggered when the line camera detects the particles in sampling area, two orthogonal images are recorded by two planar cameras using the double-exposure or multiple-exposure in one frame. The 3D images of particles are obtained by pixel matching and grid reconstruction method, based on which the 3D sizes, axis ratio, orientation, fall velocity, and other characteristics of particles are calculated. This method can measure the 3D micro-physical characteristics of precipitation particles automatically and precisely.

Abstract: A method and video sensor for precipitation microphysical features measurement based on particle image velocimetry. The CCD camera is placed facing towards the light source, which forms a three-dimensional sampling space. As the precipitation particles fall through the sampling space, double-exposure images of precipitation particles illuminated by pulse light source are recorded by CCD camera. Combined with the telecentric imaging system, the time between the two exposures are adaptive and can be adjusted according to the velocity of precipitation particles. The size and shape can be obtained by the images of particles; the fall velocity can be calculated by particle displacement in the double-exposure image and interval time; the drop size distribution and velocity distribution, precipitation intensity, and accumulated precipitation amount can be calculated by time integration.

Abstract: A method and video sensor for precipitation microphysical features measurement based on particle image velocimetry. The CCD camera is placed facing towards the light source, which forms a three-dimensional sampling space. As the precipitation particles fall through the sampling space, double-exposure images of precipitation particles illuminated by pulse light source are recorded by CCD camera. Combined with the telecentric imaging system, the time between the two exposures are adaptive and can be adjusted according to the velocity of precipitation particles. The size and shape can be obtained by the images of particles; the fall velocity can be calculated by particle displacement in the double-exposure image and interval time; the drop size distribution and velocity distribution, precipitation intensity, and accumulated precipitation amount can be calculated by time integration.