Combination of mechanical athermalization with manual in IR zoom telescope

Details Combination of mechanical athermalization with manual in IR zoom telescope Combination of mechanical athermalization with manual in IR zoom telescope

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1540..724c&link_type=abstract

Proc. SPIE Vol. 1540, p. 724-728, Infrared Technology XVII, Bjorn F. Andresen; Marija S. Scholl; Irving J. Spiro; Eds.

Computer Science

Scientific paper

An infrared zoom telescope possessing the lenses made of germanium and working at -10 degree(s) to 40 degree(s)C and at 8 - 12 micrometers has been designed. The main problem to be solved is that the refraction index of Ge changes with the temperature, resulting in decollimation. For the purpose of lower production cost and reduced size and weight, a combination of mechanical passive athermalization by the collimating lens group with manual athermalization by the front lens which is chiefly utilized to focus the object is adopted. The lens mount is made of aluminum alloy. A pair of elements of mechanical passive athermalization, nylon/indium steel, is used to partially compensate the effect of variation of refraction index of Ge and expansion or contraction of aluminum alloy on the distance between the fixed and the collimating lens groups. The manually additional adjustment of the focusing lens, i.e., the front lens, is to partially compensate the distance between the front lens and the second lens group.

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