Abstract: This invention discloses a system and method useful in moving labware between laboratory devices, such as liquid handlers, readers, washers, dispensers, sealers, incubators, microarrayers and labeling devices, such a bar code labelers, to aid in automation of laboratory tasks and assay procedures. Work cells addressing particular laboratory tasks comprise modular components such as stack links, track links, arm links and laboratory devices, such as washers or plate readers. Based upon the required flow of labware movement, the individual modular components are selected and interconnected to create a high-speed work cell. The work cells are easy to configure and setup and permit configuration on available bench top space or within other small spaces, such as laboratory fume hoods. All mechanical and electrical connections between the module components of the work cell are self-contained within the system.

Abstract: A variable attenuator includes a rotatable actuator and cam arrangement arranged to vary a length of an air gap between ends of fibers in a transmission line. The cam arrangement includes a cylindrically shaped cam member having an end surface cut to fit a curve representing normalized attenuation-to-gap-length data, the cam follower(s) being fitted in a sliding member that holds the end of the optical fiber and moves it relative to a fixed end of another fiber connector member. The cam surface includes multiple identical cam surface sections extending less than 180° around the cam to define movement of the cam follower(s) and the sliding member between a maximum position and a minimum position.