In addition to the actual sonar survey of the cavity using sonar it is essential to record in addition diverse physical parameters for ensuring the accuracy of the sonar data. Indeed, layering of media in caverns can be identified by an increased gradient in the temperature and acoustic velocity, and this leads to a deflection of the sonar beam. If this effect is not taken sufficiently into account, the results will be flawed. For this reason, logs are usually recorded during surveying to prevent precisely this from happening. The acoustic velocity in the medium, the pressure, temperature, CCL, M-CCL data, the tool tilt and - if measured - also natural gamma readings supply important and even vital physical data and information on the prevailing cavern conditions.

Erfassung von Logs