Level indicator for liquid hydrogen tank

A cryogenic tank assembly for storing a liquid, said tank assembly comprising:

• an inner tank holding the liquid;
• an outer tank provided outside of the inner tank;
• a vacuum insulation layer provided between the inner tank and the outer tank;
• a capacitive level indicator positioned within the inner tank, said level indicator detecting the level of the liquid within the inner tank;
• an inner coil positioned within the inner tank and being electrically coupled to the level indicator, wherein the capacitive level indicator and the inner coil define an LC oscillator;
• an outer coil positioned outside of the outer tank;
• and
• a signal conditioning circuit electrically coupled to the outer coil, wherein the signal conditioning circuit provides an AC signal to the outer coil so as to match the frequency of the AC signal with the resonant frequency of the LC circuit to provide an indication of the level of the liquid within the inner tank.

A cryogenic tank assembly for storing liquid hydrogen, said tank assembly comprising:

• an inner tank holding the liquid hydrogen;
• an outer tank provided outside of the inner tank;
• a vacuum insulation layer provided between the inner tank and the outer tank;
• a capacitive level indicator positioned within the inner tank, said level indicator detecting the level of the liquid within the inner tank;
• an inner coil positioned within the inner tank and being electrically coupled to the level indicator, wherein the capacitive level indicator and the inner coil define an LC oscillator;
• an outer coil positioned outside of the inner tank;
• and
• a signal conditioning circuit electrically coupled to the outer coil, wherein the signal conditioning circuit provides an AC signal to the outer coil so as to match the frequency of the AC signal with the resonant frequency of the LC circuit to provide an indication of the level of the liquid hydrogen within the inner tank.