① Perform visual inspection of the standard color palette. If it is damaged or contaminated, stop using it; if it is slightly contaminated or floating dust, clean it up and perform measurement;

②The measurement should be carried out under the specified geometric conditions;

③Use a spectrophotometer specially designed for color measurement to measure the spectral reflectance of the standard plate. This kind of spectrophotometer usually has an integrating sphere accessory or several other accessories.

④The wavelength range of the first-level standard color plate is 380nm to 780nm; the wavelength range of the second-level standard color plate should not be less than 400nm to 700nm, and the wavelength error should be less than 0.5nm. The half-width of the spectral passband should be within 10nm.

⑤The instrument should use a higher-level standard white board as a reference standard, and can only be used to measure the standard color board after calibration.

⑥ After measuring the spectral reflectance of the standard color plate, calculate the tristimulus value under a certain designated standard illuminator, and then calculate the color coordinates x, y.

The verification period of standard color swatches is generally one year, but if there is an obvious surface on the surface of the standard color swatch, and the accuracy of its measurement value is doubted, it should be sent to the measurement department for verification in time.

For different UV energy meters, the spectral response range is different, and the best induction peak spectral output is 365 nanometers. The peak spectrum of UV energy meters on the market is generally 365nm, that is, it can only be used to detect high-pressure mercury lamps for curing and drying, not LED lamps. A UV energy meter with a spectral response range of 340-420 nanometers can be used to detect LED light sources.

Linshang UV Energy Meter

Like Linshang LS130UV energy meter, it is used in optoelectronic products industry, furniture and wood industry, hardware industry, printing and silk screen industry, etc. The LS131UV energy meter is used in UV exposure, UV curing, UV flatbed printing, optical communications and other industries. In addition, Linshang Technology has four UV energy meters: LS120, LS128, LS130, and LS131 for customers to choose from.

2. UV intensity meter
Ultraviolet irradiance meter is also called ultraviolet intensity meter, UV intensity meter, UV irradiance meter, and its spectral range is 250-410 nanometers. It is suitable for ultraviolet light source, integrated circuit lithography, photochemistry, polymer material aging, coating, Ultraviolet irradiance measurement in precision devices, optical communications and other fields can detect germicidal lamps and UV curing lamps. However, there is a shortcoming that, for example, some closed inspection boxes have limitations in using UV intensity meters.

Linshang Technology has recently upgraded the multi-probe UV intensity meter LS125. For some customers’ workplaces that need to monitor the UV curing lamp and the intensity of the UV germicidal lamp, LS125 can meet a variety of needs. And economical and affordable.

3. After the upgrade, the maximum value, real-time value, minimum value and average value will be recorded, which is more conducive to customer data analysis.
4. After the upgrade, all probes can display energy values, which solves the problem of customers who need to test energy values outside the UVA band.
5. After the upgrade, the power unit of the three probes of UVA, UVALED, and UVALED-X1 can be switched between mw/cm2 and w/m2, and the power units of the remaining 6 probes can be uw/cm2, mw/cm2, w/m2 Switch between. After the power unit is switched, the energy unit will also be switched automatically.

Fourth, coating thickness testing requirements
Coating thickness gauges are again called thick film gauges, coating thickness gauges and paint film thickness gauges. The fine detection of coating thickness is helpful to confirm the best life of the coating and to understand the relationship between coating thickness and roughness. Therefore, standardizing coating thickness detection requirements has both practical and theoretical significance.

It is necessary to pay attention to the metal characteristics of the substrate when testing the coating thickness, and it is required to choose the film thickness meter to be as similar or consistent as possible with the metal magnetic properties and roughness of the test piece substrate. In addition, it is necessary to check whether the thickness of the base metal exceeds the critical value of the coating thickness measuring instrument, and pay attention to the edge effect, surface cleanliness, curvature, reading times, magnetic field and probe orientation during the test.

LS220 is a dual-purpose automotive paint meter for magnetic and eddy current. It is suitable for the measurement of non-magnetic coatings such as paint, varnish, enamel, chromium, and zinc plating on ferromagnetic metal substrates such as steel. It can also be used for copper, aluminum, die-cast zinc, yellow Measurement of non-conductive coatings on non-magnetic metal substrates such as copper, such as paint, anodic oxide or ceramics. It is especially suitable for detecting the coating thickness of automobile paint.

The LS220 automotive paint meter is a coating measuring instrument with a host and probe integrated, which is very portable. The paint film meter only needs 0.5 seconds to complete a measurement without calibration, and the operation is extremely simple.
LS220B automotive paint meter with Bluetooth is also called car paint meter, which is an integrated instrument with host and probe. The instrument is widely used in the used car industry. When buying a used car, you will encounter a lot of accidental cars that have been repainted or even made sheet metal. It is difficult to judge the overall condition of the car by visual inspection, so most used car appraisers will choose to use a car paint meter with Bluetooth to measure the painted surface thickness of the car.

LS220B automotive paint meter has Bluetooth data transmission function. When testing the painted surface thickness in different places of the used car, the test data can be saved on the mobile phone APP and the test report can be exported. The report can be used to scientifically and objectively analyze the overall condition of the used car painted thickness.

First, select category

There are low-pressure mercury lamps on the market, as well as LED UV lamps.

The low-pressure mercury lamp is currently the mainstream product with a life span of 8000 hours. The main wavelength is 253.7nm with high sterilization efficiency. The radiation efficiency is 18W single-ended as an example, which is above 23%, and the high power can reach 30-40%. The power is from 1W to 300W, which can meet the needs of different usage scenarios, and the light maintenance rate is high.

LEDs have long lifespan, current efficiency is low, about 3%, low power, mainly in the milliwatt level; the current mainstream wavelength is 275nm. Generally speaking, LED UVC has a promising future. It is currently suitable for disinfection in small spaces such as contact lens disinfection. Other scenarios are more suitable for experimental use by professionals due to the lack of cost-effectiveness. UVC irradiance meter is used to test the irradiation intensity of the uvc led light sources.

Second, choose materials

Take the mainstream low-pressure mercury lamp as an example. There are two types of low-pressure mercury lamps on the market: quartz tube and high boron glass.

Quartz tube ultraviolet germicidal lamp:

1. The material with the highest ultraviolet transmittance can transmit more than 90% of 253.7nm ultraviolet rays;

2. High ultraviolet intensity, long life, low light decay, good sterilization effect, lamp life is generally greater than 8000 hours.

High boron tube ultraviolet germicidal lamp:

1. High boron glass can only transmit about 50% of 253.7nm ultraviolet light;

2. Its ultraviolet radiation intensity is small and its life span is short. Several established international companies are doing well, such as Philips/OSRAM.

Third, choose whether to contain ozone

Quartz UV lamps are divided into ozone and ozone-free.

Need to make a choice for specific use scenarios. Such as disinfection box or warehouse goods disinfection, need to use ozone. (Note: Since ozone is harmful to cultural relics/calligraphy, etc., you need to consult a professional before use.)

Doped (Ti, Ce) quartz glass for ozone-free ultraviolet lamps;

Natural quartz glass, used for ozone ultraviolet lamps;

Synthetic quartz glass has a higher cost and is used for ultraviolet lamps with higher requirements. General household. Don't choose the ozone function, which is harmful to human health.

Fourth, select power

For space disinfection, one square can be configured with 1W, and for high-demand ones, one cubic can be configured with 1.5W. Taking the floor height of 3 meters as an example, 4.5 watts per square meter is required.

Dosage considerations

The structure of the pneumonia coronavirus is similar to the SARS virus, and it is also sensitive to ultraviolet radiation. In the later period of SARS in 2003, CCTV pointed out in a corresponding report: 30-watt ultraviolet light, at a distance of 1m, will kill the virus in 30 minutes. The ultraviolet illuminance at 1 meter is 90 microwatts/cm². The dose is: 90X30X60=162,000 microwatts·sec/cm² Illuminance*time=UV energy value.

Illumination time calculation

Comparison calculation: Take a 30W wall-mounted ultraviolet germicidal lamp as an example, the ultraviolet illuminance measured at a certain distance is the divisor, and the calculated value is the required time. For example, at 20cm, the actual measurement is 1000 microwatts/square centimeter (of course, the illuminance distribution is related to the position of the corresponding lamp), and the calculated irradiation time is 2.7 minutes. (Illumination is inversely proportional to the square of the distance.)

Viruses are much harder to kill than bacteria. One of the reasons is that the (volume) area of ​​viruses (different light and high temperature, considering more area factors) is much smaller than bacteria. For example, the area of ​​Escherichia coli used in general experiments is about 10 times larger than that of general viruses. Of course, there are differences in their DNA/RNA and outer wall factors.

Radiation dose (recommended)

• There are only four types of ferromagnetic metal elements at room temperature: iron, cobalt, nickel, and thorium.
• Common non-ferromagnetic metals: copper, aluminum, magnesium, zinc, chromium, etc.
• Hall effect: can be used for the measurement of non-ferromagnetic coatings on ferromagnetic metal substrates.
• Eddy current: can be used for the measurement of non-conductive coatings on non-magnetic metal substrates.

The actual anti-corrosion operation is based on the specific conditions of the inner wall pipeline and the outer wall pipeline. Since the inner wall pipeline is in close contact with natural gas and oil, the frictional resistance should be as small as possible. A thinner anti-corrosion coating can strengthen the adhesion of the coating to the inner wall of the pipeline, and occupy as little as possible the internal volume of the pipeline. In most cases, we will find that the thickness of the anticorrosive coating on the inner wall of the pipeline is about 0.2mm by using a coating thickness gauge.
　　 Because the outer wall pipeline is in contact with nature or soil, it needs relatively strong wear resistance. In addition, the temperature dissipation and hardness of the outer wall pipeline are also important considerations. A slightly thicker anti-corrosion coating can substantially increase the overall hardness of the pipeline. The actual thickness of the anti-corrosion coating can be known by measuring with a coating thickness gauge, which can give strong guidance for maintenance work.
The high-performance coating thickness gauge can help people determine whether the thickness of the pipeline anticorrosive coating meets the requirements. Linshang Technology's LS223 coating thickness gauge has strong corrosion resistance and wear resistance, and is used for long-term underground pipeline anticorrosion The coating thickness measurement is very suitable. At the same time, its operation is quite simple, and the instrument can be used directly after zeroing.