a-scan in a sentence

1. The results are presented in the form of snapshots and a - scan plots
2. Comparison of c - scan of entire sample and the date of local point a - scan collected and processed with the metallorgaphs of sample cross section showed that the method could be used to determine the spot size of resistance spot welding
3. Studied the cluster and background reduction algorithm and , proposed an enhanced adaptive step average method based on the amplitude of a - scan signal ; 2 . improved the gpr data acquisition and processing software , some utilities have been added such as position wheel control program , data format translation etc . ; 3 . implemented 3d targets imaging using mixed programming of matlab and visual c + + ; 4
4. It's difficult to find a-scan in a sentence.