How do sensors accurately identify ambient temperature and humidity?

    In principle, humidity sensors for measuring ambient humidity fall into two main categories: resistive and capacitive.

    Resistive humidity measurement: The key lies in the polymer humidity-sensitive material. As humidity increases, the polymer swells, increasing its internal free volume and the number of charge carriers. Simultaneously, the activation energy of the polymer polyelectrolyte counterions decreases, improving mobility and lowering the material's impedance. Conversely, when humidity decreases, water molecules escape from the ionic polymer, increasing the material's resistance. By measuring this change in impedance, the relative humidity can be monitored.

    Capacitive humidity measurement: Humidity-sensitive capacitors are generally made of polymer film capacitors. When the ambient humidity changes, the dielectric constant of the humidity-sensitive capacitor changes, causing the capacitance value to also change. This change exhibits a linear relationship with humidity. MEMS technology further enhances its advantages of small size, low power consumption, and good consistency.

    Humidity sensors are often used in conjunction with a thermistor in temperature and humidity sensor modules to simultaneously measure both temperature and humidity.

Tensensor Temperature and humidity detection solutions

 WHT20 MEMS type Temperature and Humidity Sensor

Production advantage:
High accuracy: Temperature ±0.5°C, Humidity ±3%RH

Wide measurement range: -40°C to 85°C, Humidity 0% to 100%RH

Digital IIC output with strong anti-interference capabilities

SMD package, suitable for reflow soldering applications

Application of temperature and humidity sensors

    Due to its precision, reliability, and flexibility, our temperature and humidity sensor have been widely used in smart homes, car cockpits, portable temperature and humidity devices, smart agriculture, and other fields.

    Tensensor has deeply cultivated the core technology of temperature and humidity sensing and has the ability to independently develop a full stack of temperature and humidity sensors. Its temperature and humidity sensor series not only has excellent performance, but also supports deep customization. It can provide customized sensor solutions for specific product forms, harsh environmental requirements or special functional requirements.