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What is the working principle of the illuminance sensor? What should I pay attention to when using it?
The illuminance sensor is a commonly used detection device, which has certain applications in many industries. We see light-controlled switches in many places, such as street lights on the street, various automated weather stations, and agricultural greenhouses, but when we see this kind of box with a small ball, we know that it is the illuminance. Sensor, but I still don’t know much about it. Today we will take a look at the illuminance sensor. The working principle of the illuminance sensor The illuminance sensor adopts the principle of hot spot effect, and the most important thing is to use detection components that have a high response to low light. These sensing elements are actually like the photosensitive of a camera. Like the matrix, there is a wire-wound electroplating type multi-contact thermopile inside, and the surface is coated with a high-absorptive black coating. The hot junction is on the sensing surface, and the cold junction is located in the body, and the hot and cold junctions generate a thermoelectric potential. In the linear range, the output signal is proportional to solar irradiance. The visible light through the filter irradiates the imported photodiode, and the photodiode converts into an electrical signal according to the visible illuminance, and then the electrical signal enters the sensor's processor system to output the binary signal that needs to be obtained. Of course, there are many categories of illuminance sensors, and some categories even optimize the structure described above, especially to reduce the influence of temperature. The illuminance sensor also uses temperature compensation circuits, which are largely Improve the sensitivity and detection ability of the illuminance sensor. How to use the illuminance sensor The illuminance sensor should be installed in an open surrounding area without any obstacles above the sensing surface. Adjust the horizontal position of the sensor and fix it firmly. It is best to fix the sensor firmly on the mounting frame to reduce breakage or intermittent interruption in windy days. The installation method of the wall-mounted illuminance sensor: first drill a hole on the wall, then put the expansion plug into the hole, and screw the self-tapping screw into the expansion plug. The installation method of the louver box type illuminance sensor: The louver box type illuminance sensor is generally used in outdoor weather stations, and can be directly installed on the beam of the weather station through a bracket or a bending plate. Wide voltage power input, 10-30V can be used. When wiring the 485 signal, note that the A/B lines cannot be reversed, and the addresses of multiple devices on the bus cannot be conflicted. Precautions for the use of illuminance sensor 1. Be sure to check whether the packaging is intact, and then check whether the model and specifications of the transmitter are the same as the product you purchased ; If you have any questions, you must contact the seller as soon as possible. 2. When using the illuminance sensor, there must be no external pressure stamping light detection sensor to avoid damage to the measuring element under pressure stamping, affecting the use of the illuminance sensor or causing the illuminance sensor to be abnormal or crush the shading film to cause water leakage. Be sure to avoid using the illuminance sensor in a high temperature and high pressure environment. 3. When using the illuminance sensor, users are prohibited from disassembling the sensor by themselves, let alone touching the sensor diaphragm, so as to avoid damage to the illuminance sensor. 4. Before using the illuminance sensor, be sure to confirm whether the output voltage of the power supply is correct; the positive and negative of the power supply and the positive and negative wiring of the product to ensure that the measured range is within the corresponding range of the illuminance sensor and detailed Read the product manual or consult the seller. 5. When installing the illuminance sensor, make sure that the light-receiving surface is clean and placed on the measured surface. 6. It is strictly prohibited for the housing of the illuminance sensor to be scratched, knocked or slammed by a knife or other sharp metal connecting wires and objects, which may cause water damage to the transmitter.
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