Development of DSP based signal acquisition and processing system for Extrinsic Fabry-Perot Interferometric (EFPI) sensors

The article presents the development of a DSP based signal acquisition and processing system for Fiber Optic - Extrinsic Fabry-Perot Interferometric (EFPI) sensors. It focuses on the implementation of a Wavelet-Hilbert Transform based EFPI cavity length estimation algorithm on DSP hardware. The proposed sensor system is based on White Light Interferometry (WLI). It uses a CCD spectrometer for spectral identification. The signal processing hardware includes a DSP and FPGA. The FPGA synchronizes all the devices on board while the DSP processes the signal using the aforementioned algorithm. Testing and experimentation of hardware has been carried out by interfacing an EFPI temperature sensor. The experimental results have been presented.