A microprocessor-based on-line optical transfer function (OTF) measurement system

The development of a microprocessor-based optoelectronic system for the measurement of the optical transfer function (OTF) is considered. The method used is based on the edge image analysis. The edge intensity distribution data are stored in the microprocessor, and the computation of OTF from these data is made using the process software. The present technique avoids the differentiation and makes a clever use of edge data as such. The practical difficulty of instrumentation of the FFT technique for the required Fourier transformation has been avoided by the use of Walsh block expansion of the function to be Fourier transformed. The details of the programming as well as some experimental results using standard lens are also reported