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We report the design concept and performance of a compact, light-weight, andeconomic imaging polarimeter, TRIPOL (the Triple Range Imager and POLarimeter),capable of simultaneous optical imagery and polarimetry. TRIPOL splits the beamfrom wavelength 400 to 830 nm into g'-, r'-, and i'-bands with two dichroicmirrors, and measures polarization with an achromatic half-waveplate and awire-grid. The simultaneity makes TRIPOL a useful tool for small telescopes forphotometry and polarimetry of time variable and wavelength dependent phenomena.TRIPOL is devised for a Cassegrain telescope of an aperture of ~1 m. This paperpresents the engineering considerations of TRIPOL and compares the expectedwith the observed performance. Using the Lulin 1-m telescope and 100 secondsintegration, the limiting magnitudes are g' ~ 19.0 mag, r' ~ 18.5 mag and i' ~18.0 mag with a signal-to-noise of 10, in agreement with design expectation.The instrumental polarization is measured to be ~ 0.3% at three bands. Twoapplications, one to the star-forming cloud IC 5146, and the other to the youngvariable GM Cep, are presented as demonstration.

Triple Range Imager and POLarimeter (TRIPOL) --- A Compact and Economical Optical Imaging Polarimeter for Small Telescopes