Fig. 2: Illustration of 2 data processing modes and coordinate axes and main definitions.
From: Nano-precision metrology of X-ray mirrors with laser speckle angular measurement
F and G are, respectively, the speckle image at the reference position and at the measured position on the SUT. f and g are corresponding subsets of F and G. u and v are, respectively, the horizontal and vertical coordinates of the camera. x and y are, respectively, the tangential and sagittal coordinates of the mirror’s SUT. ∆x is the scanning step size
