We describe a new design for an astronomical polarimeter optimized for use in the 8 to 13p spectral region based on an earlier visible wavelength instrument. The combination of a special infrared ZnSe birefringence modulator and a background-limited fast photoconductive detector permits carry-over of many of the digital signal processing advantages of the earlier instrument. Within a single measurement sequence, this instrument will measure the photometric intensity, the circular polarization, and both components of the linear polarization. Used with a 2.5 meter class infrared telescope, the device should permit a 3u detection of 1% linear or circular polarization at 10u in less than 400 seconds of any compact source brighter than 1.2 mag.
P. A. Ekstrom,
R. A. Stokes,
G. M. Stokes,
J. A. Hackwell,
"A New 10 Micron Astronomical Polarimeter," Optical Engineering 20(1), 200119 (1 February 1981). https://doi.org/10.1117/12.7972656