Patent ID: 7876456
Filing Date: 2011-01-25
Classification: G01B,G02B

Abstract:
1. A method for operating at least a source+detector subsystem of a chromatic point sensor (CPS), the method comprising: (a) providing CPS electronics including a CPS source+detector subsystem comprising a CPS light source and a CPS wavelength detector; (b) inputting light from the CPS light source into a bypass optical path that bypasses at least a portion of a normal operation optical path that is directed through a CPS optical pen of the CPS during normal workpiece measuring operations, and inputting the bypass light that is output from the bypass optical path to the CPS wavelength detector; (c) forming a raw intensity profile of the bypass light distributed over a plurality of pixels along a measurement axis of the CPS wavelength detector; (d) operating the CPS wavelength detector to provide a set of raw intensity profile signals corresponding to the plurality of pixels along the wavelength detector measurement axis; (e) determining error-compensation factor data based on the set of raw intensity profile signals, the error-compensation factor data corresponding to the plurality of pixels along the wavelength detector measurement axis, wherein the error-compensation factor data are determined such that they are applicable to reduce an amount of wavelength-dependent variation for at least one of short-range variations and long-range variations included in the set of raw intensity profile signals; and (f) storing the determined error-compensation factor data in correspondence to the CPS source+detector subsystem.