Humidity Sensors

Conventional humidity sensors are primarily electronic devices. They can be designed to detect the amount of humidity present in the surrounding environment. These sensors measure the amount of humidity present in the environment by converting it to electrical signals, which is easily measurable. By comparing the live humidity with the maximum humidity at a given temperature at air, relative humidity is determined. The size and functionality of these sensors vary greatly ranging from some handheld device to larger embedded systems.
Most humidity sensors are used in meteorology, medical, automobile and manufacturing industries. Conventional humidity sensors are primarily divided into two groups: capacitive and resistive humidity sensors. While the capacitive sensors use two electrodes to monitor the capacitance which is a function of the change of humidity in the sensor’s environment, which is analysed using an embedded compute for processing. Resistive humidity sensors utilize a small polymer comb that increases and decreases in size as the humidity changes, which directly affects the system’s ability to store charge.
At Seed NanoTech International Inc, we use magneto-optic surface plasmon based sensors to monitor humidity in the air. Instead of pure electronics, as in the conventional sensors, our sensors use optical laser, magnetic field, and special designed sensor configuration.