ABSTRACT
Two methods are described for the design of antireflection coatings that act in two widely separated spectral regions. Design results are presented for coatings on ZnS, ZnSe, and Ge substrates that reduce the reflectance in a broad region at approximately 10 microm, as well as in a band of wavelengths in the visible or near-infrared part of the spectrum. Experimental results are given for one system.
ABSTRACT
A wide-angle Michelson Doppler imaging interferometer (WAMDII) is described that is intended to measure upper atmospheric winds and temperatures from naturally occurring visible region emissions, using Spacelab as a platform. It is an achromatic field-widened instrument, with good thermal stability, that employs four quarterwave phase-stepped images to generate full images of velocity, temperature, and emission rate. For an apparent emission rate of 5 kR and binning into 85 x 105 pixels, the required exposure time is 1 sec. The concept and underlying principles are described, along with some fabrication details for the prototype instrument. The results of laboratory tests and field measurements using auroral emissions are described and discussed.
