Fig. 5: Evaluation of measurement precision and imaging depth.
From: High-precision time-domain stereoscopic imaging with a femtosecond electro-optic comb
a Comparison measurement between our TDS imager (without averaging) and a CW laser interferometer. The offset distance is 1.3 m. b Measurements with 500-fold averaging. c Standard deviation (SD) evolving with signal-to-noise ratio (SNR). d Allan deviation of measurement versus averaging time (averaging number). The standoff distance is ~ 2 m. Note that the data in (a, b, and d) are calculated for imaging points with SNR > 300. e Balanced signal and EO comb pulse full width at half maximum (FWHM) recorded with tuning fr from 90 to 300 MHz. f Imaging of reflections from parts of a positive (front) and a negative 1951-USAF target (behind). They separate at 1.85 m, limited by our optical platform.
