“impact echo testing and the cheops pyramid” larry d. olson, p.e., principal engineer olson...
TRANSCRIPT
“Impact Echo Testing and the Cheops Pyramid”
Larry D. Olson, P.E., Principal EngineerOlson Engineering, Inc.Olson Instruments, Inc.
Wheat Ridge (Denver), Colorado USARutherford, New Jersey (metro New York City)
San Francisco, CaliforniaSocorro, New Mexico
www.olsonengineering.com and www.olsoninstruments.com
Concrete Thickness Gauge CTG-1TF for QA of Thickness of Highway Pavements
• CALTRANS study on Pavement found 0.16 inch thick CTG-1TF accuracy on 8 inch thick pavement (Maser et al, 2003)
Typical Concrete Thickness Gauge Display
• Resonant thickness echo peak at 5.78 inches for a 6 inch thick concrete pavement
• Easy to use push-button Gauge for field technicians
• High quality data saved for engineer analysis
Impact Echo Test
D = Vp/(2*f)D = Thickness/Echo Vp = Compressional Wave Velocityf = Frequency = Beta Shape Factor
Giza Pyramid and Sphinx
Olson Instruments Concrete Thickness Gauge used on Robot in the Cheops Pyramid by iRobot for a
National Geographic 2002 TV Special “ Behind the Closed Door”
Cheop’s (Khufu’s) Pyramid where CTG was used
Stairs ascending from the King’s tomb in the Cheops Pyramid
Vault going up into the internal chambers of the Cheops Pyramid
Sarcophagus in the Pharoah’stomb of the Cheops Pyramid
Vault going into the Queen’s Chamber in the Cheop’s pyramid – Fox Television and National Geographic Investigation of what was behind a small stone door at the end of a 250 foot long, 40 degree angled air shaft with a cross-secton of 8 x 8 inches
CTG Test Head Mounted to Pyramid Rover Robot of iRobotLink to National Geographic Special at www.olsoninstruments.com
The robot crawled up to the stone door for 75 m at a 40 degree angle
CTG Test Head on Gaterbrinck’s Door – Impact Echo predicted2-2.5 inches thick and drilling found door was 2 inches thick –
Note 2 copper pins at top of 8 x 8 inch stone door