A REFINED RECONSTRUCTION-BASED CORRELATION ESTIMATOR FOR 2-CHANNEL, NON-COINCIDENCE LASER-DOPPLER ANEMOMETRY

A new estimator is introduced for correlation functions between two or more channels of a laser Doppler anemometer. The estimator is based o n a sample-and-hold reconstruction and resampling of each channel, thu s eliminating the coincidence requirement between channels. The estima tor is applicable to two-component or three-component laser Doppler an emometry (LDA), but is particularily interesting for two-point or mult i-point LDA, where coincidence is practically non-existent. The estima tor is fully derived in this paper and verified using simulated data s ets. An appropriate transformation of coordinate systems is introduced for the case of a rotated or non-orthogonal measurement system.