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Tidal Gravity: gPhones

Portable Tidal Gravimeters

A gPhone is a metal spring relative gravimeter manufactured by Micro-g LaCoste. It is derived from geophysical survey instruments but specifically optimised for measurements in the tidal frequency band by component screening, improved the temperature stability with double oven controls and better vacuum seals for improved pressure stability. In addition the gPhone is equipped with a precise GPS locked Rubidium clock for accurate timing of the phase of tidal constituents.

Three gPhones are being used to improve the accuracy of ocean tide loading models around Australia. One has just finished observing at Jabiru in the Northern Territory and two are deployed near Katherine and Tennant Creek

Record of AuScope gPhone deployments

Tidal gravimeters gPhone81 and gPhone85 being tested at Mt Stromlo.

gPhone81 at Broome

Insulated installation

Updated:  19 May 2014/Responsible Officer:  Director, RSES /Page Contact:  Web Admin