An optical displacement measurement device in which variations in interference light by stray light are suppressed to improve interpolation accuracy and detection accuracy. According to an embodiment, the present invention provides a method for fabricating a copper indium diselenide semiconductor film. Once the data field is displayed, the GUI can receive a tag from the user labeling the data field. The channel estimate is determined based on the training signal set, where the channel estimate includes an m-by-n description of the communication channel. Interceptor guidance uses the initialization and the propagated states and typing information to command the interceptor. The invention involves coating the hyperbolic or cylindrical surfaces of quadrupole systems with thin insulating layers and metal films thereupon and generating axial potential gradients or saddle ramps using appropriate electrical supply of DC potentials and superimposed RF voltages to the metal films.