Sensors are: optical sensors, temperature sensors, pressure sensors.
Optical sensors
Optical sensors are sensors that utilize the principles of refraction, reflection and diffuse reflection of light to monitor and detect objects. Commonly used to measure the brightness, color, shape and other parameters of the object. It is widely used in industrial production and automation fields, such as detecting product shape, color, surface defects, width and other information.
Two, temperature sensors
Temperature sensors are sensors used to measure temperature changes on the surface or inside an object. The working principle of these sensors can be based on thermal diffusion, thermoelectric effect, resistance temperature change and so on. Temperature sensors are widely used in a variety of industrial places and electronic devices, such as temperature control, heat treatment, high-precision measurements and so on.
Three, pressure sensors
Pressure sensors are a kind of sensor used to measure pressure changes. It can convert pressure signals into electrical signals to detect and monitor physical changes under various pressure conditions. Application areas for pressure sensors include manufacturing, healthcare, food processing and environmental monitoring.
Role of Sensors
I. Monitoring the Environment
Sensors can monitor and sense a variety of physical quantities in the environment, such as temperature, humidity, barometric pressure, light, and so on. Through these monitoring, we can better understand the environment and obtain the required information. Currently, many smart homes use various types of sensors to monitor indoor temperature and humidity to regulate devices such as air conditioners and humidifiers to provide a comfortable living environment for humans.
II. Controlling devices
Sensors can also be used to control various devices such as automobiles, robots, and factory equipment. Sensors control the operation of equipment by sensing changes in the environment and equipment and converting these changes into electrical signals. For example, when a car sensor detects low tire pressure, it sends a warning signal to the car's computer system so that the car driver can make timely repairs and ensure driving safety.
Three, safety and security
Door and window opening and closing sensors can detect whether the windows are opened, thus helping users to protect their homes and properties. In addition, the sensors can also play an important role for some situations such as fire or gas leakage. Once they detect the danger, they immediately send an alarm signal to the fire department or related organizations to protect people's lives and properties.