Abstract: A method of volumetric additive manufacturing, comprising rotating a vial of photocurable resin; creating patterns of structured light images of an object to be manufactured so that the shape of the light dose distribution matches a desired shape of the object; correcting for diffusion within the vial; projecting the patterns of structured light images via a projector onto the rotating vial of photocurable resin thereby printing the object corrected for diffusion; and removing the printed object from the vial.

Abstract: A method and apparatus are set forth for volumetric additive manufacturing (VAM) wherein light rays that are used to determine tomographic projections are modelled using ray tracing, in order to account for projector non-telecentricity and etendue in all three dimensions. The path of rays from each light source (e.g. pixel) are computed as they propagate through the VAM system. Optical effects such as refraction, transmission loss, absorption, etendue, and non-telecentricity are intrinsically accounted for via ray tracing. Using these rays, the required dose to solidify the photosensitive resin is computed.

Abstract: A system for forming an object having a three-dimensional structure, the system comprising: a container for providing a photo-curable material to be polymerized; a rotatable stage for supporting the container; a light source for providing light rays having at least one light pattern to be guided into the container via an optical assembly; a processing unit for determining the light source's degree of non-telecentricity, and determining an optimally pre-distorted set of the at least one light pattern based on at least the photo-curable material's refractive index; correcting at least one distortion of the light rays caused by refraction at the container interface and/or correcting at least one distortion of the light rays caused by non-telecentricity; and whereby the correction of the at least one distortion of the light rays is performed without altering the calibration of the optical assembly.

Abstract: Volumetric Additive Manufacturing allows for the rapid printing of objects by transmitting images into a reservoir holding resin, using wavelengths of light associated with a photocuring characteristic of the resin. Feedback based control can be enabled through the use of optical scattering tomography based imaging of the object during the printing process. Through capturing a set of images representing the scattering of a non-curing light, an isosurface representing the object during printing can be generated. The differences between the isosurface and the expected shape of the object can be used as an input into a control process or they can be displayed to an operator so that printing can be terminated when the printing of the object is complete.

Abstract: A system for forming an object having a three-dimensional structure, the system comprising: a container for providing a photo-curable material to be polymerized; a rotatable stage for supporting the container; a light source for providing light rays having at least one light pattern to be guided into the container via an optical assembly; a processing unit for determining the light source's degree of non-telecentricity, and determining an optimally pre-distorted set of the at least one light pattern based on at least the photo-curable material's refractive index; correcting at least one distortion of the light rays caused by refraction at the container interface and/or correcting at least one distortion of the light rays caused by non-telecentricity; and whereby the correction of the at least one distortion of the light rays is performed without altering the calibration of the optical assembly.

Abstract: A technique for calibrating a 3D imaging system (3D-IS) that has a large field of view (FoV?1 m3) involves: a metrological target mounted for fixed positioning with respect to an origin of the 3D-IS; a movable target plate (MTP) with at least one fiducial mark provided on a marked surface thereof; and a range and orientation measurement system (ROMS) on the MTP for measuring a distance and orientation of the MTP relative to the metrological target. The MTP is designed so that when the MTP is manipulated within the 3D-IS's FoV at an angle at which the ROMS can determine its position and orientation relative to the metrological target, at least a majority of the at least one fiducial marks is presented for coordinatization by the 3D-IS. Using such equipment, calibration involves using the measured data and the simultaneous coordinatization to calibrate.