Airgun firing

Gundalf Calibration data, January 2004

Index of contents

Note that all data were modelled with a sample interval of 0.5 msec and a flat sea surface was assumed with a reflection coefficient of -1.0.

Bolt 1500LL, 1900LLX, 8500 APG

Source of data

These data were supplied by Mike Saunders of Bolt in December 2003. They are high-quality data recorded at a specialist facility. For the 1500LL and 1900LLX guns, the Gundalf model is displayed concurrently with the recorded data. For the 8500 APG gun, the Gundalf model and recorded signatures are shown accompanied by graphs of signature parameters over the full range of volumes.

Data parameters

Signatures

Gun type

Modelled and recorded signatures
1500 LL, 200 cu.in.
1500 LL, 380 cu.in.
1900 LLX, 80 cu.in.
1900 LLX, 200 cu.in.
8500 LL (APG), 80 cu.in.
8500 LL (APG), 200 cu.in.
8500 LL (APG), 380 cu.in.

Gun and data type

Modelled and recorded signature parameters
APG Gun bubble periods
APG Gun zero -> peak amplitude (bar-m.)
APG Gun zero -> peak primary to bubble ratio

Sleeve and Sodera G gun

Source of data

These high-quality data were supplied by Alain Regnault of CGG in May 2003. A range of single guns were used and the data are showed as zero - Peak amplitude, zero - Peak primary to bubble and bubble period for a range of guns from 45-250 cu.in.

Data parameters

Signatures

Gun and data type

Modelled and recorded signature parameters
G Gun bubble periods
G Gun zero -> peak amplitude (bar-m.)
G Gun zero -> peak primary to bubble ratio
Sleeve Gun bubble periods
Sleeve Gun zero -> peak amplitude (bar-m.)
Sleeve Gun zero -> peak primary to bubble ratio

Clustered sleeve guns

Source of data

These data were acquired by Mike Hall of Horizon in the late 1980s. They are high-quality data acquired in a measurement facility in Loch Linnhe in Scotland. A cluster of 2 identical 40 cu.in. sleeve guns was deployed at different separations 0.5m - 2.5m. and the zero - Peak amplitude, zero - Peak primary to bubble and bubble period for these separations.

Data parameters

Signatures

Gun set up

Modelled and recorded signature parameters
2x40 cu.in. sleeve guns - bubble periods
2x40 cu.in. sleeve guns - zero - peak amplitude
2x40 cu.in. sleeve guns - zero - peak primary to bubble