Schlieren processing methods are applied to a flared cone geometry in a Mach 6 quiet tunnel. High speed schlieren videos of laminar and transitional boundary layers over freestream unit Reynolds numbers ranging from 6.4*10^6/m to 10.4*10^6/m are used to analyze the characteristics of second-mode rope waves. The power of PSDs derived from schlieren video generally correlates with PCB RMS measurements at varying Reynolds numbers and axial positions. It is shown that a limited number of schlieren frames can be used to create frequency-based pixel disturbance contours that resemble contours created by schlieren PSDs. Lastly, the performance characteristics of an IC2 MHzPressure Model EP-1000 sensor is compared to that of a PCB. They are found to detect similar second-mode instability characteristics after a correction is applied.