The temperature of the sensor core is related to the magnitudes of the positive and negative thermal energies loaded onto the core
Release time:
2025-09-25
The temperature of the sensor core is related to the magnitudes of the positive and negative thermal energies loaded onto the core.
The temperature of the sensor core is related to the magnitudes of the positive and negative thermal energies loaded onto the core. If the temperature of the sensor core is maintained above the ambient temperature, the positive heat energy loaded on the sensor core comes from electrical energy. According to Joule's law, if the heating current on a given resistor R is I and the heating time is T, then I2 * R* T of electrical energy is converted into thermal energy. The negative heat energy loaded on the sensor core can be the heat energy transfer caused by thermal convection and conduction resulting from the temperature difference between the sensor core and the surrounding environment. The influence of positive and negative heat energy on temperature is reflected in the heating power and cooling power of the sensor core, which jointly determine the stable temperature of the sensor core.
Assuming the operating environment temperature of the sensor core is 25℃, the optimal temperature for the gas concentration response of the sensor core is 80℃, and the negative heat energy lost due to heat conduction and convection is a measurable value that remains constant, then the core temperature at this point in the environment is only related to the heating power. As mentioned above, if an appropriate current is given to the core, it can maintain the set point temperature. If the ambient temperature fluctuates up and down, the heating and cooling power of the core will change with the temperature. To keep the core at the set point temperature, it is only necessary to adjust the size of the current on the core. At 25℃, the relationship between the actual measured heating power and the core temperature is shown in Figure 2. When the heating power is 0.45W, the core can stably operate at the set temperature of 80℃.
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