Patent ID: 6611326
Filing Date: 2003-08-26
Classification: G01N

Abstract:
An apparatus for measuring the effectiveness of a wafer drying operation, comprising:a laser for applying laser energy; a focusing lens for directing the laser energy onto a patterned surface of a wafer; a dichroic mirror for directing fluorescent energy emanating from the surface of the wafer; a first photomultiplier for capturing an image of detected fluorescent energy; a partial reflector for directing reflected laser energy from the surface of the wafer; and a second photomultiplier for capturing an image of the reflected laser energy received from the partial reflector; the image of the detected fluorescent energy and the reflected laser energy used to produce a composite image used to evaluate the effectiveness of the wafer drying operation, wherein the laser directs laser energy through each of the partial reflector, the dichroic mirror, and the focusing lens before the laser energy is received on the patterned surface of the wafer and the reflected laser energy and the fluorescent energy emanating from the surface of the wafer return through the focusing lens to the dichroic mirror through which the reflected laser energy passes, the reflected laser energy continuing to the partial reflector.