Small Angle Measurement in a Turbulent Environment Using Position-Sensitive Detectors
A LEP and a 4Q position-sensitive detector are evaluated in terms of resolution. The properties of the detectors are examined by calculating the theoretical system noise equivalent power (SNEP) for both and comparing the results with measured values. The SNEP of the 4Q detector is shown to be about 30 times lower than that of the LEP. The theoretical SNEP of the 4Q detector is increased by the background radiation in an outdoor environment, but is still 6… 15 times lower than that of the LEP. The inherent sensitivity of the 4Q detector in turbulent environment is corrupted by the turbulences, and the resolution of the LEP is 8… 25 times better. Turbulence sensitivity is not inherent to a 4Q detector, but is due to the defocusing needed to achieve a certain measurement span.
KeywordsNoise Source Shot Noise Light Spot Detector Surface Turbulent Environment
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