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Instrumentation For Measuring The Refractive Index Structure Constant

One of the measurable parameters of interest to experimenters who evaluate resolution characteristics of optical systems is the refractive index structure constant, C. During the last five years, several research programs have addressed the subject of measuring average values of Cn over paths of various lengths rather than performing point measurements with differential thermometers to determine C. These research programs have resulted in workable designs of instruments, but little has been done to evolve these designs into reliable and available commercial products. This paper relates the experiences involved in converting a well developed laboratory instrument into a configuration for use in the field.