Abstract: An ion implanter, including an ion source generating an ion beam, a set of beamline components directing the ion beam to a substrate along a beam axis, normal to a reference plane, a process chamber housing the substrate to receive the ion beam, and a conoscopy system. The conoscopy system may include: an illumination source directing light to a substrate position, a first polarizer assembly, comprising a first polarizer element and first pair of lenses, disposed on opposite sides of the first polarizer element, and arranged to focus the light at the substrate position; a second polarizer assembly, disposed to receive the light after passing through the substrate position, including a second polarizer element and a second pair of lenses disposed on opposite sides of the second polarizer element, and arranged to focus the light at a sensor, disposed in a detector plane of a detector.

Abstract: A foot operated vehicle having a frame with a flat foot support platform supported by front and rear wheels for the support of one foot of the operator while the vehicle is propelled by the other foot of the operator and wherein turning is accomplished by a leaning motion of the operator in the intended direction of the turn. A steerable front wheel assembly of the vehicle includes a front axle, a front wheel mounted on the front axle, a steering shaft connected to the front axle and assembled to the frame for pivotal rotation of the front wheel about a generally upright axis. Bias means are connected between the steering shaft and the frame operable to bias the front wheel in a straight ahead or centered position with respect to the frame whereby upon execution of a turn, the front wheel pivots in the direction of the turn against the influence of the bias means, and is returned to the straight ahead position by the bias means upon completion of the turn.