A superlattice layer including a plurality of periods, each of which is formed from a plurality of sub-layers is provided. The pressure detection device detects a vehicle tire’s inflation pressure. By using a frequency selective detection technique, the Raman signal is amplified and extracted from the fluorescence background. Accordingly, time taken for filtering is reduced and unnecessary memory is not required. The obturators allow for the improved ease of insertion into the vessel or lumen. Distal movement of the tubular body relative to the dilating tip exerts a force on the segmented surface to thereby open the segmented surface.