A copper tube placed on the substrate was used as one electrode, and a stainless steel yarn was used as the electrode connected with the elastic conductive webbing. The distance between the two electrodes was fixed at 50 mm. The change in resistance of the textile strain sensor during the stretching and recovering movements can thus be measured. Based on the relationship between the flexion angle and the resistance of the elastic conductive webbing in the flexion-recovery cycles, the relationship between the flexion angle and the resistance of the textile strain sensor during the stretching and recovering movements can thus be obtained.2.4. Design of the Wearable Gesture Sensing DeviceThe textile strain sensor was placed in the straight position of the limbs for monitoring the flexion angle during elbow or knee movement.
In order to ensure the stabil
Water is the most essential chemical compound for humans on the Earth. Life, as we know it, is impossible without water. More than 70% of the surface of our planet is covered by water. Water is present everywhere, in air, in soil, in rocks, in plants and an animals. In air or in other gasses water can exist in two different forms. The term moisture refers to water in liquid form that is suspended in air or gas in form of small droplets. The term humidity refers to the concentration of water vapor in air, where the water is in a gaseous phase.Humidity is a physical quantity that has significant importance in a number of areas ranging from life sciences [1,2] to building automation [3].
Hence humidity control, sensing and monitoring is important in a number of areas. Fast humidity sensors are required for the diagnosis of pulmonary diseases [4] and for mapping the human respiratory system [5] by monitoring the water vapor content of exhaled breath. For meteorological applications [6] sensing of humidity is important as it indicates the likelihood of precipitation, dew or fog. In the semiconductor industry, the performance of photo-resist is critically dependent on the humidity. In the electronics industry, humidity monitoring is important as electronic items may malfunction due to high humidity. Furthermore, humidity control is essential in some buildings where humidity sensitive materials are stored such as museums, archives, warehouses.
For human comfort and to maintain the quality of a number of food products, it is important to control humidity levels inside buildings, cars, shops and other places. Many different types AV-951 of humidity sensors are needed to cover all the previously mentioned applications. As a consequence, a wide range of sensor types (see Figure 1) has been proposed for humidity measurements.Figure 1.Types of humidity sensors.In Figure 1, humidity sensors have been organized into three groups. Electronic sensors are the most common type of sensors today.