Abstract: The need for a Time Domain Integration line scan camera to change a workpiece's height in z to relocate an ROF (Range Of Focus) of fixed excursions about a fixed POLB (Plane Of Least Blur) is removed by making the location of the POLB movable, thus making the location of the associated ROF variable, while leaving the actual z height of the workpiece unchanged. This can be accomplished by ensuring that, for a desired new location of the POLB, the rate at which the physical ?ys transpire for the motion of the workpiece (which may be a PCA) matches the rate at which the optical ?ys are clocked for the TDI image sensor. That may be achieved by varying the value for physical ?y as function of the POLB's location in z regardless of Vscan, but while also adjusting Vscan if that is necessary or desirable to keep such things as sensor cell exposure levels, and contrast from moving away from their optimum values.

Abstract: The need for a Time Domain Integration line scan camera to change a workpiece's height in z to relocate an ROF (Range Of Focus) of fixed excursions about a fixed POLB (Plane Of Least Blur) is removed by making the location of the POLB movable, thus making the location of the associated ROF variable, while leaving the actual z height of the workpiece unchanged. This can be accomplished by ensuring that, for a desired new location of the POLB, the rate at which the physical ?ys transpire for the motion of the workpiece (which may be a PCA) matches the rate at which the optical ?ys are clocked for the TDI image sensor. That may be achieved by varying the value for physical ?y as function of the POLB's location in z regardless of Vscan, but while also adjusting Vscan if that is necessary or desirable to keep such things as sensor cell exposure levels, and contrast from moving away from their optimum values.

Abstract: A scanning X-ray system minimizes frequency artifacts by capturing a first and a second image that are offset in at least one direction.

Abstract: The magnification Mref for a line scan camera can be found by exploiting a difference in the way Mref affects the notion of ‘focus’ in the x and y directions. Mref enters into the calculations for selecting z while focusing in the y direction, but not in x. A thin opaque calibration target is provided at a convenient height in z called the reference plane, and has straight edges aligned parallel to the x and y directions. To find Mref the line scan camera forms images of the calibration target over a range of trial z values known to include the height of the calibration target. An arbitrary and possibly incorrect trial value Mi of Mref is then assumed and many slices of the calibrations target are calculated. Within these slices the edge parallel to the x direction will be sharply defined for some zx, while at some other zy the edge parallel to the y direction will be sharply defined. Make a note of ei=zy. Repeat these steps for some number different trial Mi that cover the plausible range of Mref.