A comparative study on the use of laser scanners for construction quality control and progress monitoring purposes

The two scanners used in this study are adopting

two different scanning technologies: pulsed-time-

of-flight-PTOF-(obtaining the distance to an

object by timing the round-trip traveling-time of

the laser) and amplitude modulated continuous

wave-AMCW-(comparing the phases of emitted

and received signals for indirect measurement of the

laser traveling time). These two types of scanners

are the two major-stream terrestrial scanners widely

used in the construction industry.