Abstract: A microarray spotter printhead is mounted to a bracket with a semi-kinematic mounting system for avoiding the need for calibration when replaced.

Abstract: An system for orienting optical components comprises a spherical mirror support that rests in an indentation and a separate fixture for aligning the support. The alignment fixture engages the support for alignment and then is removed once the desired orientation has been secured by a simple clamp.

Abstract: A variable-capacitance transducer detects the angular position of a rotatable member. The transducer includes a first capacitance plate having a plurality of electrically conductive capacitance electrodes, a second capacitance plate spaced therefrom, and a dielectric element located between the plates. At least two of the electrodes are interconnected by a conductive trace. The dielectric element or one of the plates is fixedly mounted on the rotatable member. The electrodes on the first capacitance plate, in conjunction with the second capacitance plate, form a plurality of capacitances that vary as the angular position of the rotatable member changes. A conductive guard partially envelopes the conductive trace and a conductive guard partially envelopes the electrodes on the first capacitive plate.