| 摘要 |
A new high precision volume gauging system for measuring the volume of a propellant VL enclosed at a first pressure PU within a propellant tank ( 40 ) of a volume VT. The improved precision compared with prior art is achieved in that it comprises a high precision pressure sensor ( 90 ) which is comprised of a reference chamber ( 115 ) that is connected to the propellant tank ( 40 ) by a communication line ( 140 ), a valve ( 150 ) for controlling the gas flow through the line ( 140 ), and a high precision differential pressure sensor ( 95 ) that is arranged to record the pressure difference between the reference chamber ( 115 ) and the propellant tank ( 40 ) to which it is connected through a communication line ( 130 ). |
