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Sensor Bags Light The Main Principle
Sep 04, 2017

Scenery LED street light is a highly intelligent unattended road lighting, sensor bag light using wind, solar power, with battery energy storage, sensor bag lights, so automatic management of energy is very important. Photoelectric sensor for sun, dark (sunrise, sunset) when the lighting changes can control the circuit automatically switch the electronic sensor.

Light sensor, according to weather, time and area of automatic control, shopping malls LED lights open and close. In the bright day by reducing its output power to reduce power consumption, compared with the use of fluorescent lamps, store area of 200 square meters of convenience stores can reduce the maximum power consumption by 53%. Sensor bag light life can reach about 5-10 million hours. Under normal circumstances, LED lighting life of 40,000 hours or so; luminous colors can also be used to change the way RGB colorful, so that shopping malls more colorful, more active atmosphere; and supporting the use of fluorescent phosphor blue than the use of red, green, Fluorescent purple color is higher.

Infrared sensor is to detect the human body to launch infrared and work. The main principle is: the human body through the Fresnel filter to launch about 10um infrared, enhanced the thermoelectric element PIR, when the human body's infrared radiation emission location will change, the sensor bag will make the component loss of charge balance (PIR) will be infrared radiation Energy through the Fresnel filter into electrical signals, that is, sensor bag lights, that is, thermoelectric conversion. In the passive infrared detector detection area unmanned, infrared sensor sensor is only the background temperature, when the human body into the detection area, through the Fresnel lens, pyroelectric infrared sensor is the body temperature and background temperature difference, the sensor packaging signal collection signal, And in the detection data to find the system to determine whether someone really and other infrared sources into the detection area.

Passive infrared sensors have three key components: Fresnel filter, pyroelectric infrared sensor (PIR) and matching low noise amplifier. Fresnel lens has two roles: First, the sensor bag light focus on the role of PIR pyroelectric infrared signal refraction: Second, the detection area is divided into multiple shading areas, so that the detection area into moving objects (people ) Can change the pyroelectric infrared signal in the form of temperature changes in the PIR. Typically, low noise amplifiers match. When the ambient temperature on the detector rises, especially when approaching the body's normal body temperature (37 ° C), the sensitivity of the sensor bag light sensor is reduced and the gain is compensated to increase its sensitivity. The output signal can be used to drive the electronic switch, to achieve LED lighting circuit switching control. Figure 5 is the infrared sensor appearance, infrared sensor internal structure and internal circuit diagram. Sensor bag light source Infrared sensor with LED lighting, is E27 standard screw cap lamp, the power supply for the AC180V-250V (50 / 60Hz), infrared sensor detection range of about 3M-15M, the standard product IFS-Bulb 3W lamp to 80 lm, 5W Lights up to 140 lm. The infrared sensor is embedded in the center of the LED light source module. Once the infrared sensor detects the body temperature, the sensor bag light LED bulb will automatically turn on and off within 50 seconds.

Infrared sensors have similar applications, in recent years in the automatic detection of moving objects to get more applications. Ultrasonic sensor mainly uses Doppler principle, through the crystal outward launch more than human perception of high-frequency ultrasound, the general choice of 25 ~ 40kHz wave, and then control the module to detect the frequency of the reflected wave, the sensor bag if the region has object movement, The frequency will have a slight fluctuation, that is, the sensor bag illuminates the Doppler effect, the sensor bag lights in order to determine the lighting movement of the object area to achieve the purpose of the control switch.