Economic high resolution fringe counting for heterodyne interferometers using FPGA technology

Felix Meli
Simple FPGA PCI boards are capable of capturing digital signals up to 40 MHz and analogue signals up to 200 kHz, making them suitable to replace whole machine controllers of multi-axis measuring machines. Unfortunately capturing a 4 MHz heterodyne signal (beat frequency) at a 40 MHz rate will result in a poor phase interpolation. We present a statistical approach to the phase evaluation while maintaining a reasonably high data rate and synchronicity with acquired analogue...
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