  In this paper we present the design, calibration method, and initial results
of the Dual-Beam Imaging Polarimeter (DBIP). This new instrument is designed to
measure the optical polarization properties of point sources, in particular
Main Belt asteroids. This instrument interfaces between the Tek 2048x2048
camera and the University of Hawaii's 88-inch telescope, and is available for
facility use. Using DBIP we are able to measure linear polarization with a
1-sigma Poisson signal noise of 0.03% per measurement and a systematic error of
order 0.06% +/- 0.02%. Additionally, we discuss measurements of the
polarization of the asteroid 16 Psyche which were taken as part of the
instrument commissioning. We confirm Psyche's negative polarization of -1.037%
+/- 0.006% but find no significant modulation of the signal with rotation above
the 0.05% polarization level.
