Reliability at Sea of LaCoste-Romberg Surface-Ship Gravity Meter S-9 when Accelerometer Damping is 0.75 that of Critical.

摘要

Tests were made at sea with the LaCoste-Romberg surface-ship gravity meter S-9 while its horizontal accelerometers were 0.75 critically damped. These tests supersede those reported previously in which the accelerometers were overdamped. Performance of the meter with the new accelerometers is a very significant improvement over that with overdamped accelerometers. Both the systematic and random errors have been greatly reduced when Browne corrections are low to moderate. Measurements with the present meter at Browne corrections below 275 mgal were found to be reliable and required no empirical correction; those at Browne corrections greater than 275 mgal (300-500) were observed to be in constant error along any one profile in an unchanging sea. Presumably the error at the larger accelerations is of electronic origin, in which case it can be eliminated. Investigations will be made into the source of the difficulty; when corrected, further sea tests will be made at Browne corrections larger than 300 mgal.