![]() ![]() After that, the mirror temperature is maintained at the sample gas dew point temperature. After this change is compared and amplified by the control loop, the thermoelectric pump excitation is adjusted to reduce the cooling power appropriately. The light has diffuse reflection on the mirror surface, and the reflection signal induced by the photoelectric sensor decreases with it. When the temperature of the mirror surface drops to the dew point of moisture, dew (frost) starts to appear on the mirror surface. The photoelectric sensor senses and outputs the photoelectric signal, compares and amplifies it through the control loop, and then drives the thermoelectric pump to cool the mirror surface. At this time, the light emitted by the light source in the photoelectric detection device is almost completely reflected on the mirror surface. When the temperature of the mirror surface is higher than the dew point temperature of moisture, the mirror surface is dry. When the measured moisture enters the dew point measurement room, it will pass through the cold mirror surface. The dew point meter is an instrument that measures the absolute moisture content of a gas based on this unit system. ![]() It can be seen that the dew point temperature is a unit system for measuring the moisture content of a gas. ![]() It is one of the ways to express the absolute humidity of a gas. Dew point can be simply understood as the temperature at which the water vapor content in a gas reaches a saturated state. ![]()
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