Title :
High-performance front-end electronics for frequency-modulated continuous-wave interferometers
Author :
Minoni, U. ; Rovati, Luigi
Author_Institution :
Dept. of Electron. for Autom., Brescia Univ., Italy
Abstract :
A high-performance analog electronic circuit for processing the signal from an absolute distance meter based on a frequency-modulated continuous-wave (FMCW) interferometer is presented. The front-end electronics includes a derivative block followed by a the time-variant baseline restoration of the photodetector current. A high signal-to-noise ratio is ensured by avoiding the use of a resistive transimpedance preamplifier and subsequent voltage processing. The paper details the electrical scheme of the preprocessing chain as well as the experimental results from an actual prototype of a distance meter.
Keywords :
analogue processing circuits; distance measurement; light interferometers; measurement by laser beam; photodetectors; absolute distance meter; analog electronic circuit; derivative block; frequency-modulated continuous-wave interferometers; front-end electronics; photodetector current; preprocessing chain; resistive transimpedance preamplifier; signal-to-noise ratio; time-variant baseline restoration; voltage processing; Amplitude modulation; Diode lasers; Frequency; Interferometers; Laser beams; Optical interferometry; Optical modulation; Optical sensors; Optical signal processing; Photodiodes;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
