Lens Performance in a Nonstandard or Unstable Thermal Environment.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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Analytic techniques for determining the optical performance of a camera lens under the influence of steady state and transient thermal conditions are developed. A computer program using a simplified model of the lens to determine certain key physical and optical parameters is developed. The steady state analysis finds these parameters at a new temperature directly, while the transient analysis employs finite difference equations which are solved numerically to find the temperature inside the lens as a function of position and time prior to determining the parameters. With this information, the Modulation Transfer Function MTF, a measurement of lens performance, is determined using existing methods. Based on limited experimental evidence, correct trends of lens performance under various thermal conditions can be predicted.
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