Abstract: Provided herein are an optical test platform and corresponding method of manufacturing the same. The test platform may include a shell defining a cavity for receiving a sample tube, a first aperture, and a second aperture. The first aperture and the second aperture of the shell may each be configured to optically couple the cavity with an exterior of the shell. The test platform may further include a first window and a second window embedded in the shell. The first window may seal a first aperture and the second window may seal a second aperture. The first window and second window may each permit the optical coupling of the cavity with the exterior of the shell. The first window and the second window may be optically coupled via the cavity, and the shell may prohibit optical coupling between the first window and the second window through the shell.

Abstract: In one embodiment the invention provides an impact-absorbing unit comprising an outer wear-resistant casing (10) and one or a plurality of inner stress resistant envelopes (20) containing impact absorbing material. The outer envelope is provided with a plurality of interconnection means (65, 70) on at least one surface thereof, whereby a plurality of such units can be connected together in a closely adjacent relationship to define a substantially continuous surface. In another embodimentthe compressible elements are directly enclosed within the casing (10).In another embodiment the loose fill of compressible elements is replaced by at least one open cell foam element and valve means are provided for evacuating air from the foam, whereby to compress the foam and allow subsequent expansion thereof by exposure to ambient air pressure.