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High Resolution Acoustic Televiewer

The HRAT (High Resolution Acoustic Televiewer) provides a continuous high-resolution oriented ultrasound image of the borehole wall.

The probe uses a fixed acoustic transducer and a rotating acoustic mirror to scan the borehole walls with a focussed ultrasound beam. The amplitude and travel time of the reflect

Features such as fractures reduce the reflected amplitude and appear as dark sinusoidal traces on the log. The travel-time log is equivalent to a high-precision 360-arm caliper and shows diameter changes within open fractures and ‘break-outs’. Directional information is also recorded and used to orient the images in real time.


  • Fracture identification and orientation
  • Stratigraphic studies
  • Local stress studies (break-out)
  • Core orientation
  • Cased-hole studies


Diameter: 42mm
Length: 1.62m
(2.06m with natural-gamma option)
Weight: 6.5kg
Transducer type: 1.5MHz piezo-composite
 Rotation rate:  5 – 20rev/s
 Sample rate:  up to 360/rev

Sales Information

I002184 HRAT probe (4-core version)
I002192 HRAT including natural-gamma

Download High Resolution Acoustic Televiewer sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

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