Renishaw Plc

Andrew Mark Woolfrey

Brian John Edward Smith

John Charles Clifford Day

Robert Bennett

Angus Bewick

An optical slit comprises two bladeswhich define a slit between them, each blade being independently movable. This enables both the slit position and the slit width to be adjusted. The slit may be aligned with the center of a light beam by aiming the light beam at a detector, traversing at least one edge of the slit across the beam path, measuring the intensity of transmitted light at the detector for each position of the slit, and feeding back a signal which adjusts the slit position for maximum light throughput. The width on the optical slit may be selected by placing the slit in the path of the light beam and measuring the light transmitted at the detector, calculating the percentage of light transmitted for that slit width and feeding back a signal which adjusts slit width to obtain the desired amount of light throughput.

Optical slit

An electron microscopeis adapted to enable spectroscopic analysis of a sample. A parabolic mirrorhas a central aperturethrough which the electron beam can pass. The mirrorfocuses laser illumination from a transverse optical pathonto the sample, and collects Raman and/or other scattered light, passing it back to an optical system. The mirroris retractable (within the vacuum of the electron microscope) by a sliding arm assembly

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Wotton-under-Edge, United Kingdom

Andrew Mark Woolfrey