The CHUM (Cross Hole Ultra sonic Monitor) uses the Crosshole Sonic Logging (CSL) method to perform high-resolution quality control of deep foundations.
The system uses an ultra sonic wave sent from a transmitter to a receiver pulled through water filled access tubes embedded in the concrete. The measured arrival time and energy are strongly dependent on the concrete quality.
Additional methods supported by the CHUM are Single Hole Ultra sonic Testing (SSL/SHUT) and Tomography (two- and three-dimensional).
The CHUM is fully compliant to ASTM D6760 – 16, AFNOR NF P 94-160-1 and additional standards.