sentence1: as is shown from our theory of dual phase grating interferometry , x-ray irradiance at detector entrance is a result of cross-modulation between the fringe patterns generated by phase gratings g 1 and g 2 respectively .
sentence2: as is shown from a quantitative theory of dual phase grating interferometry , x-ray irradiance at detector entrance is a result of cross-modulation between the intensity patterns generated by the two phase-gratings g 1 and g 2 respectively .