Turbulence levels  are measured using hot wire anemometry. Small diameter wire or film sensors connected to specialized amplification equipment produce signals proportional to the fluctuating velocity, or turbulence. Probes are calibrated in a special facility setup where pressure, temperature, and airspeed can be independently varied.

Many Turbofan engines use lobed mixers to  promote mixing between the core and fan airstreams. Hot wire anemometry helps the engineer determine if the exhaust system (mixer, duct, and plug) design is producing the desired effect. A transverse pie shaped section downstream of the mixer is surveyed. The central region shows elevated levels from the wake of the central plug; the outer region shows the evolution of the mixing process downstream of the mixer lobes.