Ultraviolet irradiance meters are often referred to as UV energy meters. With the development of economy, the ultraviolet radiation illuminance meter (UV energy meter) is used more and more in industry, and the traceability of the ultraviolet radiation illuminance meter becomes more and more important. The international division of UV bands is not uniform. At present, the division of ultraviolet radiation bands in China is divided into four bands: A1, A2, B, and C. The ultraviolet light sources corresponding to the above four wavelength bands include high-pressure mercury lamps, black-light type high-pressure mercury lamps, and low-pressure mercury lamps. Lifting Column,Lifting Column For Furniture,Lifting Desk Column,Height Adjustable Desk Legs Ningbo Yinzhou Beilian Machinery And Equipment Co., Ltd. , https://www.astandingdesk.com
The working standard of China's ultraviolet radiation illuminance is mainly composed of a spectroradiometer, a standard ultraviolet radiation illuminance meter, various ultraviolet light sources, etc., which are used to store and reproduce the ultraviolet radiation measurement values. However, because the above standards were built in 1989, they can no longer fully meet the traceability requirements of the modern market for UV radiation meters. With the gradual introduction of such instruments abroad, the calibration of UV irradiance meters has emerged with the coexistence of multiple national standards, which has caused problems for the majority of users of UV irradiance meters.
Second, the market with multi-national standards coexisting At present, the domestic market share of the irradiator produced by the three countries of the United States, Germany, and Japan is still quite large. Relatively speaking, the instrument is also doing well, with good stability and long life. But there is a big problem. Even the standards of the same country cannot be completely unified. For example, the American standard, UV irradiance is traceable to NIST, but it has produced different measurement results. The two most typical manufacturers of irradiance meters, EIT and International Light, also use A-band instruments to verify with national standards. The indication error of EIT is 30% ~ 70%, while the indication error of International Light can be Control within 10%, which is basically consistent with national standards. The instruments in Germany and Japan also have the same problem. There are instruments that are consistent with national standards and instruments that have far-distance measurement results. For example, two instruments with different models from the same manufacturer in Germany have the same measurement band, but the measured results are very different. This may be caused by the inconsistent spectral response of the calibration light source or instrument detector. In short, there is no unified standard for ultraviolet irradiance in the world to restrict manufacturers. This has caused the situation of multi-national standards coexisting, which also makes it difficult to measure ultraviolet irradiance.
Here it is necessary to talk about China's UV irradiance standards in the international comparison. In December 2002, the Chinese Academy of Metrological Sciences (NIM) participated in the first international “APMP ​​PR-S1 International Comparison of Illuminance Response of UVA Detectors†organized by the Asia-Pacific Metrology Planning Organization (APMP). The comparison results show that: in the seven participating laboratories, the magnitude of NIM is closest to the international reference value, and the deviation of the UV365 illumination response of the narrow band UVA and the UVA illumination response of the wide band is -0.57% respectively from the international reference value ( k = 2) and -0.53% (k = 2). Under certain conditions, the uncertainty of the recurrence of the magnitude of the ultraviolet radiation in the broad band has also been improved from 10% (k = 1) to 2.0% (k = 1). It should be said that China's existing UV radiation illuminance standards are trustworthy.