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Brief analysis of UVC LED application

linshang — Mon, 10 Aug 2020 09:15:43 GMT

Brief analysis of UVC LED application

Deep-ultraviolet LEDs have gradually been recognized by the market with many advantages such as safety, environmental protection, compactness, high efficiency, and low consumption. They have been initially used in water treatment, air sterilization, food preservation and other fields.

1. Deep UV LED Market

Deep UV LEDs have been recognized by the market for their performance advantages such as safety, environmental protection, compactness, high efficiency, and low consumption. They have already seen clues in the fields of water purifiers, maternal and child products, air conditioners, refrigerators and other high-end consumer products. The principle of deep ultraviolet sterilization and disinfection is that deep ultraviolet rays can destroy the genetic material DNA or RNA molecular structure in microorganisms, causing bacteria to be unable to reproduce or even inactivate, thereby achieving the purpose of sterilization and disinfection. According to BIS Research Analysis data, by 2023, the market scale of UVC will be It will be close to 500 million US dollars in 2023, with an average annual growth rate of 41.9%. The main parameter to measure the sterilization efficiency is the radiation dose received by the bacteria (radiation dose (mJ/cm2) = radiation time (s) * deep ultraviolet radiation intensity (mW/cm2)). The greater the radiation dose, the higher the sterilization efficiency . UV radiometer is used to test the uv irradiation intensity.

Second, the advantages of deep ultraviolet LED sterilization

Compared with other sterilization methods such as chlorination, ozone and ultraviolet mercury lamp sterilization, deep ultraviolet LED sterilization has many advantages:

Efficient sterilization, the UVC segment ultraviolet light emitted by the deep ultraviolet LED generally kills bacteria and viruses within a few seconds. The traditional water sterilization methods such as chloride and ozone generally take 20 minutes to 1 hour;

Wide range of bactericidal properties, because bacteria, virus antigens and other microorganisms are not resistant to ultraviolet light, deep ultraviolet light can kill almost all bacteria and viruses with high efficiency, and deep ultraviolet LED sterilization technology can also be used to a certain extent Inhibit the growth of some higher aquatic organisms, such as algae, bloodworms, paramecium, etc.;

Safe and environmentally friendly (without mercury), the most obvious advantage of deep-ultraviolet LED devices over the mercury-excited UV lamps currently on the market is that the germicidal light source does not contain mercury. Mercury is a heavy metal substance, commonly known as mercury, which can be used at room temperature. Evaporation, mercury vapor and mercury compounds are highly toxic (chronic). In the sterilization process of traditional ultraviolet mercury lamp germicidal lamps, once the lamp tube breaks, it will cause serious water pollution. Deep ultraviolet LED devices are a safe and reliable device. Does not contain heavy metals, simple operation, safe and reliable operation;

Energy saving, long life, low maintenance costs, deep ultraviolet LED sterilizers are gradually replacing the common mercury lamp ultraviolet sterilizers on the market. One of the important reasons is that ultraviolet LEDs have low power consumption and are very energy-saving. The power of deep ultraviolet LEDs is about mercury lamps. One tenth, this ratio greatly saves costs;

Small size, flexible design, easy installation, deep ultraviolet LED device, small size, and flexible design of its sterilization device, which can be used in small spaces where traditional ultraviolet mercury lamps cannot be used.

UV intensity meter test uvc lamp

linshang — Fri, 07 Aug 2020 02:08:39 GMT

Therefore, the UV intensity meter is very important. Unqualified UV lamps will produce a large amount of ozone, causing great harm to human health. Through the test data monitored by the UV intensity meter, it is possible to screen the unqualified UV lamps in the UV lamp production process in time, prevent the bad products from being sold in the market, and find the UV lamps of poor quality in time. This is one of the important functions of the UV intensity meter
Monitoring the ultraviolet lamp through the ultraviolet intensity meter can effectively reduce the damage to the human body caused by excessive ultraviolet rays. Prolonged exposure to ultraviolet rays can cause cancer in the skin. Prolonged exposure will not only affect the epidermis, but also damage the internal tissue structure. Excessive UV exposure can cause conjunctivitis. In the case of some bad ultraviolet lamps, when the switch is turned on, the human body is allowed to be exposed to ultraviolet rays for more than 10 seconds. Too much ozone causes long-term dispersion.
According to news reports, the eyes were burned due to the sterilization of ineffective ultraviolet lamps. The reason for the burns of such inappropriate UV lamps is that the UV lamps are not tested in time and are not replaced, and the intensity of the UV lamps is out of control.
Therefore, the UV lamp must be tracked together with the UV intensity meter during use, and the abnormal data of the inspection result should be analyzed and investigated while the problematic UV lamp should be disabled.
When using the UV intensity meter LS126C, before using a new UV lamp, self-measure the intensity of the survey to check whether it is qualified. The UV lamp that lasts for more than 1000 hours every 2 months will be self-tested every month. Through the test results, the operating intensity of the lamp can be grasped in time to ensure the quality of air disinfection. Exceeding the prescribed time limit, using ultraviolet lamps or purple lamps with weak sterilization intensity may be the cause of insufficient ultraviolet radiation intensity. It should be distinguished by UV intensity meter monitoring.

Principle of UVC sterilization

linshang — Tue, 04 Aug 2020 05:57:28 GMT

Ultraviolet germicidal lamps are mainly in the UVC band, of which the strongest germicidal power is in the range of 250-270nm. The UVC ultraviolet radiation intensity of the corresponding band needs to use a UVC light meter.
　　 1. The principle of UVC sterilization
Because the resonance spectrum of mercury is 253.7nm, this kind of germicidal lamp can produce 253.7nm-based ultraviolet rays, which denature bacterial and viral DNA and RNAV, and cells cannot reproduce. Ultraviolet disinfection lamps are effective against any bacteria or viruses, and concentrated high-intensity UVC ultraviolet rays can kill bacteria in a short time. It is widely used for disinfection and sterilization of air, various material surfaces, water or other liquids. The effect of UVC ultraviolet sterilization is not only related to the wavelength, but also to the radiation dose. The increase in the radiation dose increases the sterilization amount, but it is not linear, that is, the sterilization rate (percentage) is not proportional to the radiation dose (the ultraviolet radiation dose is equal to the ultraviolet irradiance value multiplied by the time).
　　2, UVC generation
The best disinfection and sterilization effect is c-band ultraviolet rays with a wavelength of 254 ~ 257nm. How to obtain economical sterilization ultraviolet? Low-pressure mercury lamp is an efficient 254nm ultraviolet light source. There are many types of ultraviolet low-pressure mercury lamps, which are divided into: arc discharge low-pressure mercury lamps and glow discharge low-pressure mercury lamps; according to cathode types: hot cathode low-pressure mercury lamps and cold cathode low-pressure mercury lamps; classified according to the amount of ozone produced : There are ozone lamps and ozone-free lamps. At present, the most commonly used sterilization is the hot cathode low pressure mercury lamp. Ozone-free lamps are used for sterilization in human areas, and ozone lamps can be used for sterilization in unmanned areas. Ozone itself also has a sterilization effect. The disadvantage of the low-pressure mercury lamp is that it is not easy to make a high-power lamp, generally not more than 100W. After the power is greater than 40W, the 254nm ultraviolet conversion will decrease. This limits its scope of application. When a high-power sterilization ultraviolet source is required, a long arc high-pressure mercury lamp or a metal halide lamp (antimony neon lamp) can be used.
　　3. The influence of UVC ultraviolet radiation intensity, distance and time on sterilization
When using a straight tube-shaped linear light source low-pressure mercury lamp for sterilization, when the irradiation distance is less than 1/2L (L: the length of the low-pressure mercury lamp), the ultraviolet radiation intensity is approximately inversely proportional to the distance; when the irradiation distance is more than 1/2L, The intensity of ultraviolet radiation is approximately inversely proportional to the square of the irradiation distance; when the ruler> 4L, the irradiance calculation error is less than 5%. Ultraviolet radiation dose = ultraviolet radiation intensity (E) x exposure time (t). Therefore, the ultraviolet radiation dose is directly proportional to the exposure time. When a low-pressure mercury lamp is used for sterilization indoors, the total power of the lamp is fixed after the lamp is installed, the lamp position (that is, the distance) is fixed, and the ultraviolet radiation dose is only related to the exposure time. Controlling the irradiation time controls the irradiation dose, that is, the sterilization rate.
　　4, UVC ultraviolet ray sterilization of the surface of the object
Sterilize the surface of the object in a dust-free environment, and perform the sterilization according to the following conditions.
Ultraviolet radiation power: 2W/m2;
The distance between the lamp tube and the illuminated surface: 1.25～1.50m;
Irradiation time: 30rain;
Effective irradiation area (below the tube vertically): 1.5～2.0m2.

Flyer killer uv intensity test

linshang — Mon, 03 Aug 2020 08:01:54 GMT

UV intensity tester used in fly killer
Abstract: The fly-killing lamp is mainly used to kill mosquitoes. The text mainly talks about what is a fly-killing lamp, why is it necessary to use an ultraviolet light meter to detect the fly-killing lamp, and the ultraviolet light meter to detect the fly-killing lamp.
Fly killers are used by more and more people in killing mosquitoes. So how to better use the fly lamp to kill mosquitoes, this article will take you to better understand.
1. What is a fly lamp
The fly-killing lamp mainly has the effect of killing mosquitoes and flies. It mainly uses the special ultraviolet band to attract mosquitoes, and then kill the mosquitoes and flies by electric shock or stick trap. The fly killer mainly uses ultraviolet rays in the UVA band. The ultraviolet rays in the UVA band are also called black light. The usual wavelength range is 320-400nm. Ultraviolet rays in this band are more attractive to mosquitoes. High-voltage electric grids or fly paper are usually installed around the fly-killing lamp. When mosquitoes approach the fly-killing lamp, they will be directly electrocuted to death or stick to death.
2. Why use UV intensity tester to detect fly-killing lamps
Fly killers usually use LED ultraviolet rays (365nm commonly used) in the UVA band of 320-400 nanometers. This band of ultraviolet rays is often called an optical trap that attracts phototaxis. It is very attractive to mosquitoes. So in the process of killing flies with the fly-killing lamp. Trapping mosquitoes has become very important, and the process of trapping mosquitoes is not only related to the wavelength of ultraviolet light. It also has a great relationship with the energy intensity value of ultraviolet rays. UV intensity tester is usually used for detection, because the energy value of ultraviolet light source can attract more mosquitoes when the energy value of the ultraviolet light source reaches the standard under the same wave band, while the attraction of the fly killer with attenuated light source to mosquitoes is relatively small.

Coating thickness gauge for second hand car

linshang — Thu, 30 Jul 2020 06:01:14 GMT

With the continuous improvement of people's requirements for the quality of life, the development of the national economy is getting better and better, and the national purchasing power has been continuously rising. Nowadays, Chinese Volkswagen's tolerance for second-hand cars has become much higher than before. From the fear of resistance, including resistance to second-hand cars, to the continuous rectification of the industry norms, the tolerance for second-hand cars has also begun to change. Volkswagen began to look at second-hand cars rationally. After all, compared with new car purchase tax, second-hand cars are much more cost-effective than new cars after two years of use.
　　 However, in spite of this, the second-hand car market is still mixed. The quality of some employees in the second-hand car industry is uneven. The condition of second-hand cars is relatively opaque to buyers. These various reasons have become obstacles to the purchase of second-hand cars. Only when you learn the basics of identifying second-hand cars can you accurately assess the price of second-hand cars.
If you want to identify the condition of a second-hand car, the coating thickness gauge is an indispensable testing instrument. Although whether the vehicle cover is sheet metal or not, it is not particularly important to the value of the second-hand car, but we can use the paint film meter The values displayed on the screen provide a very direct and clear understanding of the severity of vehicle damage, and it is also more conducive to our in-depth vehicle condition inference.
　　 Under normal circumstances, if a used car has had an accident, there will definitely be traces of sheet metal or spray paint repair on the paint surface of the vehicle's body, and generally speaking, the scope of this repair will be very large. Therefore, in the second-hand car market, as long as it involves second-hand car inspection, it is generally necessary to use a paint film meter to conduct in-depth inspection of the car's paint surface. As long as you can accurately determine the specific situation of the paint finish of the car, you can get a rough idea of the accident history of the used car.

Electric welding arc light intensity detection

linshang — Tue, 28 Jul 2020 07:16:36 GMT

Electric welding arc light is a very harmful light. The national occupational health standard GZB/T 189.6-2007 clarifies the method for measuring the ultraviolet radiation of electric welding arc light by physical factors in the workplace, and measures the surface, eyes, limbs and other exposed parts of the operator. Irradiance or exposure.
The application of ultraviolet irradiance meter in electric welding arc industry is everywhere. When passing by the repair shop, workers can always be seen holding their masks doing welding. It hurts my eyes to see a shining arc. This is probably the most common impression of arc welding in many people. Through the application of our UV irradiometer in the detection of welding arc industry, we can understand this industry.

Electric welding arc light is a very harmful light, which can be said to be a source of work pollution. The pressure reducer in the electric welding machine reduces the voltage and enhances the current, so that the electric energy generates huge arc heat to melt the electrode, and produce such a moment of strong light Light. Due to the widespread use of electric welding, our country defines the method of measuring ultraviolet radiation for physical factors in the workplace in the occupational health standard GZB/T 189.6-2007. Measure the irradiance or exposure of the operator's face, eyes, limbs and other exposed parts. If a protective mask is used, the intensity of ultraviolet radiation on the eyes and face inside the mask should be measured. The standard also mentions that the main frequencies of arc welding are 365nm, 290nm and 254nm.

The LS125 uv light meter is a multi-channel device that can support nine kinds of probes. The operation is relatively simple. If you want to measure the ultraviolet intensity of any band, you can directly change the ultraviolet probe of the corresponding band. This is also the most comprehensive multi-channel UV irradiometer with UV probes on the market. Need to measure the UV intensity of electric welding arc, UVC, UVB, UVA-X1 probes of LS125 multi-channel UV light meter are the best choice!

Difference between Linshang UV light intensity meters

linshang — Mon, 27 Jul 2020 03:18:59 GMT

Users who often purchase Linshang UV light intensity meters know that, in addition to LS126C, Linshang Technology’s UV light intensity meters for UV germicidal lamp detection also include LS125 ultraviolet irradiance meters and several different probes. There are 9 types of LS125 probes, so how do we choose between the 9 types of LS126C and LS125?
Three of the nine probes of the LS125 ultraviolet irradiator are used for the detection of the radiation intensity of the germicidal lamp. They are LS125+UVC, LS125+UVC-WP, and LS125+UVCLED. It is used for the detection of the irradiance intensity of the germicidal lamp with a peak wavelength of 254nm. The third paragraph is mainly used for the irradiance detection of the germicidal lamp of UVC LED light source. The main differences are as follows:
UV Irradiance Meter LS126C
1. LS126C ultraviolet irradiator is suitable for detecting the intensity of ultraviolet germicidal lamps in hospitals, disease control centers, transmission windows and other occasions. A 1-meter measuring rod is provided as a gift. The instrument can be connected to mobile phones via Bluetooth to avoid ultraviolet burns to inspectors. Suitable for low-pressure mercury lamp type germicidal lamps.
2. LS125+UVC ultraviolet radiation meter uses a large range of probes with a range of 0-200000μW/cm², which is suitable for measuring the ultraviolet intensity of high-power germicidal lamps. Such as the common low-pressure mercury lamp for sterilization.
3. The LS125+UVC-WP ultraviolet irradiator is an enhanced version of UVC, which can be measured under 1 meter underwater and is waterproof. It is suitable for the detection of sewage treatment and some UV germicidal lamps placed in a relatively humid environment.
4. LS125+UVC-LED is a professional to detect the intensity of UVC LED germicidal lamp.
Through the above introduction of several UV irradiance meters suitable for germicidal lamp detection by Linshang Technology, I believe that most users must have a certain understanding of these UV irradiance meters for germicidal lamps. Then you can follow their own The industry needs to choose a suitable UV irradiator.

253.7nm germicidal lamp intensity test

linshang — Fri, 24 Apr 2020 03:41:34 GMT

In the Wuhan area where the epidemic is severe, and in designated hospitals where other patients gather, ensuring the stability and standards of UV lamp irradiation is of great practical significance for ensuring the health of the people and stabilizing the epidemic. The measuring instrument we must use is an ultraviolet irradiance meter, because the irradiance value of the ultraviolet lamp is in nanometers, and it is a wrong way to observe its brightness by naked eyes, so it is impossible to correctly evaluate the use of the lamp. Different levels of ultraviolet radiation will affect the effect of killing pathogens, and it is also not conducive to the smooth work of medical staff.
Generally speaking, among the ultraviolet disinfection lamps used in all walks of life, the most commonly used is the UV-C model. Their common working principle is to use the powerful energy of different wavelengths of ultraviolet to kill germs. Regarding the currently popular new coronavirus, the UV-C model ultraviolet disinfection lamp has a wavelength of 253.7nm, which has the most obvious killing effect and can be applied to a variety of scenarios and occasions.
The UV meter is a high-precision, wide-range ultraviolet intensity value measuring instrument. Its function is to help quality inspectors calibrate and replace the UV lamp. In the current winter when the epidemic situation is tight and the ambient temperature is low, the UV meter can automatically compensate for the temperature and ensure the accuracy and stability of the data. In terms of measurement, its sensitivity is very high, and it is also convenient for the hospital's inspectors to work extremely efficiently.
The new type of coronavirus is coming fiercely, is ultraviolet light a good way to kill it? The answer is self-evident, and of course it is yes. As for the specific killing situation, it is necessary for our medical institution technicians to cooperate with professional testing equipment-ultraviolet radiation illuminance meter to conduct standardized testing and standardized application of ultraviolet lamps.