Popular science: explain in detail the principle and functional application of ultraviolet sensors
The human five pipes are very complex and sensitive 'sensors'. However, most people's five senses can only perceive information from the outside world qualitatively, but not quantitatively. In addition, there are many physical quantities that cannot be felt by the human five senses, like infrared and ultraviolet spectra. The earliest ultraviolet sensor was based on pure silicon, but according to the instructions of the National Institute of Standards and Technology, pure silicon diodes also respond to visible light and form unwanted electrical signals, resulting in low accuracy. More than ten years ago, Nichia Corporation of Japan grew GaN-based crystals and became a pioneer of GaN-based systems, and thus opened up the GaN-based market, and thus produced GaN-based ultraviolet sensors. The accuracy is much higher than that of single crystal silicon, making it the most commonly used material for ultraviolet sensors. ZnS materials of group 26 have also been developed and applied to the field of ultraviolet sensors. Currently, Suzhou Hengye Technology New Materials Co., Ltd. has been developed in China. From the perspective of research and development and performance testing, its accuracy is nearly 10^5 times higher than that of GaN-based sensors. To a certain extent, ZnS-based ultraviolet sensors will be on par with GaN-based UV sensors. Ultraviolet sensor is a kind of sensor, which can use photosensitive element to convert ultraviolet signal into measurable electrical signal through photovoltaic mode and light guide mode. The working modes of UV sensors are generally divided into two categories: photovoltaic mode and light guide mode. The so-called photovoltaic mode means that there is no need to connect batteries in series, there is current in the series resistance, and the sensor is equivalent to a small battery, the output voltage, but the production is more difficult, the cost is relatively high; the photoconductive mode means that a battery needs to be connected in series, and the sensor is equivalent to one The resistance, the resistance value changes with the intensity of the light, this kind of production is easy and the cost is low. Ultraviolet sensor is also called ultraviolet photosensitive tube (ultraviolet tube for short), which is a photoelectric tube that utilizes the photoelectron emission effect. It has the characteristics of high sensitivity, high output, high response speed, etc., and has strong anti-interference ability, stability and reliability, long life, integrated temperature and humidity sensor in one, and more comprehensive measurement data. Protect against rain and snow. With the widespread application of electronic computers, various sensing technologies serving computers have received more and more attention. The ultraviolet sensor can detect ultraviolet rays that are not detectable by human senses. When ultraviolet rays are irradiated on the ultraviolet sensor, more than 98% of the ultraviolet rays pass through the transparent window made of high-quality light-transmitting materials, and irradiate the measuring device that is sensitive to ultraviolet rays with a wavelength of 240~370nm. Through the monitoring and analysis of the imported high-precision ultraviolet sensor, after processing by the circuit with the American imported industrial-grade microprocessor chip, the ultraviolet intensity is output as an RS485 signal and displayed on the background to achieve the purpose of monitoring the ultraviolet intensity. It can be widely used in environmental monitoring, weather monitoring, agriculture, forestry and other environments. Measure ultraviolet rays in the atmosphere and under artificial light sources.
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