iGrav™
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5 iGrav™ SG Meter SIMPLIFIED SUPERCONDUCTING
GRAVIMETER
Figure 1: iGrav™ System
Superconducting persistent currents (i) produce the most stable relative gravity meter in existence. • Super stable:
Drift less than 0.5 microGal/month INTRODUCTION The iGrav™ Superconducting Gravity Meter is portable, easy to us, and much more affordable than the GWR Observatory Superconducting Gravimeters (OSG) in use worldwide observatories in the Global Geodynamics Project.1,2 The iGrav™ is designed specifically for geophysical applications that require much higher stability and precision than provided by mechanical spring-type gravity meters, but which can be set up easily and quickly without the need for an expensive platform, housing or infrastructure. The iGrav™ sg meter has an ultra-low drift of less than 0.5 microGal/month and a virtually constant scale factor. In its cryogenic environment, the iGrav™ sg sensor is totally insensitive to local changes in temperature, relative humidity, or pressure. With these properties, the iGrav™ sg meter provides a precise and continuous record of gravity variations that occur over periods of days, months, years, or even decades with a stability and precision that sets the highest industry standard. In contrast, spring-type gravity meters are limited by large, variable, and non-linear drifts greater than several microGal/day and are sensitive to both temperature and pressure. These characteristics obscure and interfere with the analysis of non-periodic gravity signals, which are vital for interpreting and analyzing geophysical processes. Reference: 1. Global Geodynamics Project (http://www.eas.slu.edu/GGP/ggphome.html) Reference: 2. Goodkind J M (1999) The superconducting gravimeter. Review of Scientific Instruments 70(11): 4131-4152
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