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: A pair of strap adjustment assemblies for a bicycle helmet is provided. A first pair of straps is connected to one side of the helmet and a second pair of straps is connected to the other side of the helmet. A first strap adjustment assembly includes a release lever and a base for engaging the first pair of straps. The lever can be moved from a closed position to an open position. When the lever is in the open position, the user can move the strap adjustment assembly along the first pair of straps to adjust the location of the strap adjustment assembly. When the lever is in the closed position, the first strap adjustment assembly draws together the first pair of straps at a desired location. A second strap adjustment assembly is similar the first strap adjustment assembly and engages the second pair of straps, which are connected to the other side of the helmet.