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PHASECam is the Large Binocular Telescope Interferometer's (LBTI) phasesensor, a near-infrared camera which is used to measure tip/tilt and phasevariations between the two AO-corrected apertures of the Large BinocularTelescope (LBT). Tip/tilt and phase sensing are currently performed in the H(1.65 $\mu$m) and K (2.2 $\mu$m) bands at 1 kHz, and the K band phase telemetryis used to send tip/tilt and Optical Path Difference (OPD) corrections to thesystem. However, phase variations outside the range [-$\pi$, $\pi$] are notsensed, and thus are not fully corrected during closed-loop operation.PHASECam's phase unwrapping algorithm, which attempts to mitigate this issue,still occasionally fails in the case of fast, large phase variations. This cancause a fringe jump, in which case the unwrapped phase will be incorrect by awavelength or more. This can currently be manually corrected by the observer,but this is inefficient. A more reliable and automated solution is desired,especially as the LBTI begins to commission further modes which require robust,active phase control, including controlled multi-axial (Fizeau) interferometryand dual-aperture non-redundant aperture masking interferometry. We present amulti-wavelength method of fringe jump capture and correction which involvesdirect comparison between the K band and currently unused H band phasetelemetry.

A two-band approach to n$\lambda$ phase error corrections with LBTI's PHASECam