The "Five Senses" of the Internet of Things: Application Classification and Popular Research Directions of Sensors

• Categories:Industry information
• Time of issue:2017-05-05 17:20

(Summary description)　　As an important entry point for data in the Internet of Things system, the role of sensors is too important. For the Internet of Things, sensors are like the eyes, ears, mouth, nose, tongue, skin, and the human body. Human beings rely on the above body senses to perceive the environment and make appropriate responses. Similarly, the Internet of Things also needs to perceive surrounding objects and the physical environment through sensors, so as to provide a basis for data analysis at the application layer of the Internet of Things.     Sensors can be divided into two categories according to their working principles, physical sensors and chemical sensors. 1. Physical sensors 　　Force sensors: pressure sensors, torque sensors, speed sensors, acceleration sensors, displacement sensors, position sensors, flow sensors, hardness sensors, density sensors, etc.; 　　Light sensor: visible light sensor, infrared sensor, ultraviolet sensor, image sensor, optical fiber sensor, etc.; 　　Acoustic sensors: acoustic wave sensors, ultrasonic sensors, infrasonic wave sensors, etc.; 　　Electric sensors: current sensors, voltage sensors, electric field intensity sensors, etc.; 　　Thermal sensor: temperature sensor, heat flow sensor, thermal conductivity sensor, etc.; 　　Magnetic sensors: magnetic field intensity sensors, magnetic flux sensors, etc.; 　　Ray sensor: X-ray sensor, gamma-ray sensor, beta-ray sensor, etc. 2. Chemical sensors: ion sensors, humidity sensors, biological sensors, gas sensors, etc. 　　Sensors and sensor network technology are the basis for the development of the Internet of Things. From the above classification, it can be seen that the sensing range of sensors is far beyond your imagination. As the top priority of the perception layer of the Internet of Things, the research on sensors in the industry has been a hot field that is difficult to conquer in recent years. This has also become an important factor in the implementation of the Internet of Things. In other words, China's achievements in this area are particularly weak.   Popular direction of sensor research 1. Wireless sensor 　　As far as the actual application of the Internet of Things is concerned, it is often necessary for the aircraft to spread a large number of sensors to the environment that needs to be monitored, and these sensors cannot be connected to the circuit one by one. At this time, it is necessary to send data through a wireless channel.     2. MEMS sensor 　　Compared with traditional sensors, it has the characteristics of small size, light weight, low cost, low power consumption, high reliability, suitable for mass production, easy integration and realization of intelligence. At the same time, the feature size on the order of micrometers allows it to perform functions that cannot be achieved by some traditional mechanical sensors. 3. Wireless Ad Hoc Network 　　This is a "peer-to-peer structure" mobile communication mode that does not require base stations. All networked devices in the network can realize dynamic networking during the movement. It has the characteristics of dynamic topology, no central control node, and multi-hop routing. 　　Eventually, sensors will develop in the direction of wireless sensor networks (WSN). Previously, the dynamic networking of the Internet of Vehicles was also based on such considerations.