Patent ID: 7075660
Filing Date: 2006-07-11
Classification: G01B

Abstract:
1. A multi-beam probe for interferometrically measuring compound surfaces of a test object comprising: a probe body having a reference axis; a beamsplitter that divides a beam into first and second measuring beams propagating within the probe body; a first deflector that directs the first measuring beam from the probe body at a given angle with respect to the reference axis for measuring one of the compound surfaces; a second deflector that directs the second measuring beam from the probe body at one of a plurality of variable angles with respect to the reference axis for measuring other of the compound surfaces; and a beam adjuster associated with the second deflector that changes the variable angle between: a first variable angle at which the second measuring beam is directed from the probe body for measuring a second of the compound surfaces, and a second variable angle at which the second measuring beam is directed from the probe body for measuring a third of the compound surfaces.