1 June 1974 Rapid Real-Time MTF Measurements In A Field Environment
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Abstract
It was first shown by H. H.Hopkins that the optical transfer function can be directly measured by means of a shearing interferometer. With the advent of lasers in the past ten years, and the need for very high-quality optics both in the laboratory and in field environments, the interferometric technique appears to be ideally suited to single-wavelength measurements. Several laboratory-type interferometers have been described in the literature,2-'7 although in most cases these instruments were not suitable for either routine optical testing or for field use. More recently, a cornercube shearing interferometer was constructed for making MTF measurements on board a KC-135 jet aircraft.8 However, all these past instruments were relatively slow. Very rapid real-time OTF measurements are required in field environments. A new rapid-scanning interferometer has been developed, which requires no adjustments in use and is extremely stable, even in environments where large vibrations are encountered.
© (1974) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Kelsall, D. Kelsall, } "Rapid Real-Time MTF Measurements In A Field Environment", Proc. SPIE 0046, Image Assessment and Specification, (1 June 1974); doi: 10.1117/12.953992; https://doi.org/10.1117/12.953992
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