## 6 Experiments and Results
### Heating Performance Test of the Conductive Center Pole at High Temperatures  
The oven was used to simulate an in situ high-temperature environment of 150 \({}^{\circ}\)C to verify the working performance of the conductive center pole in a high-temperature environment. The conductive center pole was placed in a high-temperature oven, and the rest of the connected electronic components were placed outside the oven to ensure normal operation. The principle of the experimental system is shown in Figure 25.  
The physical experiment platform is shown in Figure 26.  
The results of the high-temperature-resistance test of the conductive center pole are shown in Figure 27. Heating the same thermal oil to 90 \({}^{\circ}\)C took 2 min and 45 s longer in a high-temperature environment than at room temperature, taking 10 min and 45 s in total. On the one hand, it is considered that due to the increase in temperature, the resistance of the wires in the center pole increases, and the loss of power consumption increases. On the  
Figure 24: Heating curve of the different energization methods. Figure 25: High-temperature test experiment of the conductive center pole. other hand, the uniformity of the temperature distribution of the thermal oil is poor, and the position of the temperature sensor has great influence on its readings, which ultimately makes the heating curve of the two environments different. Long-Term Effectiveness and Stability Test of the Energy Supply Transmission and Signal Transmission of the Conductive Central Rod  
In order to verify the long-term effectiveness and stability of the conductive central rod in the process of power and signal transmission, the long-term work and temperature and pressure signal transmission test experiments were added on the basis of the above experiments. In the long-term energy supply stability test, the conductive central rod is used as the current-carrying middleware. The twisted conductive central rod is connected in series with the heating load, and the heating load is powered by a 0-30 V adjustable DC power supply. The heating medium is heat conduction oil, and the heating target temperature was set at 100 \({}^{\circ}\)C. When the target temperature was reached, the temperature was maintained by a paperless recorder and relay. The whole experiment process was set to maintain the temperature for more than 100 h. The experimental results are shown in Figure 28, which verify that the conductive central rod, as a current-carrying middleware, can stably supply power for a long time and meet the dynamic response when the voltage and current change. Figure 27: The results of the high-temperature-resistance test of the conductive center pole. Figure 26: The physical experiment platform. In addition, the signal transmission performance of the conductive central rod was verified by experiments. First, the signal transmission of the PT100 temperature sensor was tested. The temperature sensor was connected in series with the conductive central rod, and the heat conducting oil was used as the object of temperature measurement. The different temperatures of the heat conducting oil at different times were measured and recorded. The experimental results are shown in Figure 29. The temperatures measured by the temperature sensor in series with the conductive central rod and the standard temperature sensor have a high consistency. Due to the different placement positions of the sensors, the measured temperatures have slight differences, but basically meet the engineering application requirements. Later, the pressure sensor signal transmission was tested. The pressure sensor was connected in series with the conductive central rod, and connected with the hydraulic station for pressurization and pressure data acquisition.