1 overview of sensor technology
People in order to obtain information from the outside world must use sensory organs, in the process of information transmission, the first thing to solve is to get accurate and reliable information, sensor (transducers) is to obtain the natural environment and the corresponding information of the main ways and means in the process of work.
1.1 typical sensors
(1) pyroelectric infrared sensor: the pyroelectric infrared sensor (passivelnfrared ray) is a thermosensitive infrared sensor made of pyroelectric materials, which can convert the infrared radiation energy of the transparent and filtered optical wafer into electrical signals.
(2) light sensor: photosensitive sensor (photovaristor) photosensitive diode, is a kind of through the perception of ambient light and will light signal into electrical signal semiconductor device, photosensitive resistance through the core part using semiconductor photoelectric effect form resistance, can with the strength of the incoming light to change the impedance of the resistor value, brightness is strong, its resistance is small, weak light, its resistance.
(3) acoustic control sensor: microphone array is composed of sound control sensor, audio amplifier, channel selection circuit, time-delay switching circuit and silicon-controlled control circuit.
1.2 "LED+ intelligent" lighting and sensing technology
The Internet of things is a hot spot of global information application. Every object or scene that needs to be identified and managed needs to be equipped with corresponding sensors to realize information collection and transmission. The program of "LED+ intelligent" lighting system adopts modular integrated circuit and sensor application software design with main program as the core. During operation, the information collected by the sensor is processed and the instruction is conveyed to the terminal LED lamp through the functional unit of the subroutine from the main program instruction.
2 "LED+ intelligent" lighting and sensing technology combined application
2.1 "sharp tools" of intelligent lighting
"+ LED intelligent lighting System composed of sensors, Micro control unit (MCU), to control execution and LED lamp, sensor is responsible for a variety of signal acquisition and transfer of an electronic device, with MEMS (Micro - company - Mechanical System, MEMS) technology has become increasingly mature, the sensor is miniaturization, multi-functional and intelligent, and hand in hand with the development of industrialization.
2.2 commercial lighting
"+ smart LED lighting combined with sensors in offices, shopping malls, buildings, integrated buildings and public places have a large number of applications, through the sensor can manage all the particular range of LED lights, select wireless remote control or site control mode, change the traditional pattern of one-to-one switch control, improve the leds in the digital and networked systems control ability.
2.3 plant factory lighting
The solution of food, resources, environment and population problems is closely related to agricultural production, and plants can receive less and less solar energy. Therefore, the intelligent control system for agricultural lighting is widely valued by countries all over the world.
Key points and trends of sensor technology application
3.1 key points of sensor application
With the progress of Internet of things technology, sensors not only have the basic information collection function, but also the information processing ability of intelligent lighting system has become an important basis for judging its performance. In practical application, appropriate sensors should be selected according to the purpose of use, dynamic characteristics and environment.
3.2 application trend of sensor technology
As "+ smart LED lighting and mature application of sensing technology, the control function, scene control, signal processing, electronic control and intelligent control system of actuators, add Wireless, TCP/IP, GP, RS, wi-fi, ZigBee and the application of Wireless communications and networking technology to realize remote transmission and control, will be the mainstream of LED lighting technology development and the trend of the market demand.