As everyone knows, in 'Empire Strikes Back' they freeze Han Solo by using carbonite. We then see Lando Calrissian check the side of the carbonite block which has a heap of lights and buttons, which tells him he was still alive after the freezing process.
Minha pergunta é, what is the in-universe explanation as to how they were getting life signs from Han while being frozen solid in carbonite.
At least one of the gauges was a temperature monitor for the inhabitant.
Kneeling, Lando turned some knobs on the device and checked the gauge measuring the temperature of Han’s body. He sighed with relief and nodded his head. “He’s alive,” he informed Han Solo’s anxious friends, “and in perfect hibernation.”
There also seems to be some sort of sensor that measures the temperature of the carbonite.
A huge mechanical tong lifts the steaming metal-encased space pirate out of the vat and stands him on the platform. Some Ugnaughts rush over and push the block over onto the platform. They slide the coffinlike structure to the block and lift the metal block, placing it inside. They then attach an electronic box onto the structure and step away. Lando kneels and adjusts some knobs, measuring the heat. He shakes his head in relief.
And something that measures the flux(?) of the carbonite
Control panels were set along the outer side edges of the carbonite frame. Boushh pressed a button beside the carbonite flux monitor, then slid the decarbonization lever and watched a green light flicker on the life system monitor.
Star Wars Episode VI: Return of the Jedi (junior novelization)