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What is the use of UV sensors?

by:Rika Sensors     2021-10-29
What is the use of UV sensors?
The working principle of the ultraviolet sensor

The ultraviolet sensor is a sensor that uses a photosensitive element to convert the ultraviolet signal into an electrical signal. Its working mode is usually divided into two categories: photovoltaic mode and light guide mode. Photovoltaic mode means that there is no need to connect batteries in series, and there is current in the series resistance, while the sensor is equivalent to a small battery with output voltage, but it is difficult to make and the cost is relatively high; photoconductive mode means that a battery needs to be connected in series to work, and the sensor is equivalent to a resistor , The resistance value changes with the change of light intensity, this kind of production is easy and the cost is low.

The development history of ultraviolet sensors

The earliest ultraviolet sensors were based on pure silicon, but according to the research of the National Institute of Standards and Technology, pure silicon diodes also respond to visible light and form electrical signals that are not needed. , Resulting in low accuracy.

More than ten years ago, a Japanese company produced GaN-based crystals and became a pioneer in GaN-based systems, and thus opened up the GaN-based market, and thus produced GaN-based ultraviolet sensors with accuracy. The accuracy is much higher than that of single crystal silicon, making it the most commonly used material for ultraviolet sensors.

Later, ZnS materials of Group 26 have also been developed and applied to the field of ultraviolet sensors. 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.

The role of the ultraviolet sensor

1. The role in the medical field

Scientists have found that ultraviolet light with a wavelength of about 310nm has a strong dark spot effect on the skin, which can accelerate the skin’s metabolism and improve the skin’s metabolism. Growth ability, which can effectively treat photo-induced skin diseases such as vitiligo, pityriasis rosea, polymorphic sun eruption, chronic actinic dermatitis, photoprurigo, etc. Therefore, in the medical industry, ultraviolet light therapy is currently more and more used . When in use, the intensity of ultraviolet light must be well controlled, which requires the use of ultraviolet sensors for monitoring.

2. The role in the field of flame detection

The ultraviolet flame detector is the common name of the ultraviolet flame detector. Ultraviolet flame detectors detect fires by detecting ultraviolet rays generated by the burning of substances. In addition to ultraviolet flame detectors, there are infrared flame detectors on the market, which are termed linear beam smoke detectors. Ultraviolet flame detectors are suitable for places that are prone to open flames when a fire occurs. Ultraviolet flame detectors can be used in places where there is strong flame radiation or no smoldering stage when a fire occurs. The flame detection ultraviolet sensor requires the sensor itself to be resistant to high temperature and sensitive. High.

3. Role in the field of arc detection

High-voltage equipment will produce arc discharge due to insulation defects, which will be accompanied by a large amount of light radiation, which contains rich ultraviolet light, which is generated by detecting arc discharge Ultraviolet radiation can determine the safe operation of high-voltage power equipment. Ultraviolet imaging is an effective arc discharge detection method, which is intuitive and has good detection and positioning capabilities. However, the signal of ultraviolet light is relatively weak, and there are still some difficulties in detection.

4. Banknote recognition

Ultraviolet recognition technology mainly uses ultraviolet sensors to detect the fluorescent imprint anti-counterfeiting signs of banknotes and the matte light reaction of banknotes. This type of identification technology can identify most counterfeit currency (such as washed, bleached, and pasted banknotes). It is not only used in the recognition of deposits in ATM machines, but also in financial machines such as currency counters and currency detectors. Under normal circumstances, fluorescence and violet light are used to carry out all-round reflection and transmission detection of banknotes. According to the different absorption and reflectivity of banknotes and other papers to ultraviolet light, the authenticity can be distinguished.

The ultraviolet transmitter is based on a photosensitive element to convert ultraviolet rays into measurable electrical signals, and realizes online monitoring of ultraviolet rays. The circuit adopts American imported industrial-grade microprocessor chip and imported high-precision ultraviolet sensor to ensure the excellent reliability and high precision of the product. The product shell is a wall-mounted high-grade shell, with a protection grade of IP65, rain and snow proof. This product can be widely used in environmental monitoring, weather monitoring, agriculture, forestry and other environments to measure ultraviolet rays in the atmosphere and under artificial light sources.

Product features:

1. The ultraviolet measurement device is highly sensitive to 240-370 nm to accurately measure the ultraviolet intensity.

2. The see-through window adopts high-quality light-transmitting materials, and the ultraviolet light transmittance exceeds 98%, which avoids the problem of low ultraviolet measurement values u200bu200bdue to the absorption of ultraviolet rays by traditional PMMA and PC materials.

3.4-20mA/0-10V/0-5V A variety of analog output signals are optional.

4. Wall-mounted waterproof shell, high protection level, can be used in outdoor rain and snow environment for a long time.

5.10-30V DC wide voltage power supply.

With the development of new mechatronics technology, the performance of the ultraviolet sensor will be further improved, its detection results will be more accurate, the detection distance will be longer, and the dynamic detection performance will be better. Therefore, the ultraviolet sensor The application prospect of will be broader.

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