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This paper presents a rotational temperature map of a leading-edge separation in a low-density hypersonic flow, obtained using imaged fluorescence of nitric oxide (NO). A flow condition with a total specific enthalpy of 3.8 MJ/kg, and for which the continuum assumption should hold, is generated using the T-ADFA free-piston shock tunnel. A leading-edge separated flow, known as the ‘tick’model configuration and first suggested by Chapman et al.[1] for the study of laminar flow separation, is placed in this facility’s test section to produce the leading-edge separation. This model geometry is chosen for the study because it produces a near zero-thickness boundary layer prior to separation. The planar laser-induced fluorescence (PLIF) thermometry technique was chosen to generate a spatially resolved rotational temperature map using multi-line fluorescence images [2]. This technique involves making multiple …