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Adaptive optics will almost completely remove the effects of atmosphericturbulence at 10 microns on the Extremely Large Telescope (ELT) generation oftelescopes. In this paper, we observationally confirm that the next mostimportant limitation to image quality is atmospheric dispersion, rather thantelescope diffraction. By using the 6.5 meter MMT with its unique mid-IRadaptive optics system, we measure atmospheric dispersion in the N-band withthe newly commissioned spectroscopic mode on MIRAC4-BLINC. Our results indicatethat atmospheric dispersion is generally linear in the N-band, although thereis some residual curvature. We compare our measurements to theory, and makepredictions for ELT Strehls and image FHWM with and without an atmosphericdispersion corrector (ADC). We find that for many mid-IR applications, an ADCwill be necessary on ELTs.

A Direct Measurement of Atmospheric Dispersion in N-band Spectra: Implications for Mid-IR Systems on ELTs