Countermeasures and Solutions to the Current Situation of Illuminance Metering in China
In response to this chaotic situation, the best solution is to unify standards. As far as the UV irradiance meters used in industrial production are concerned, most of them are used in UV curing and UV exposure to measure the irradiance or energy of UV furnaces or UV lamps. The wave bands are in UVA and UVB for measuring UV radiation energy. There are a little more instruments, commonly known as UV energy meters. For use and calibration we recommend:
1. The same company uses the same model of instruments from the same manufacturer as much as possible, so as to facilitate the unification of measurement values, and facilitate the company's internal records and comparisons. The measurement results may also be quite different when using different models of illuminance meters from the same company.
2. The irradiance of industrial UV lamps is not very stable and uneven, it is best to measure several times when measuring. Generally, it takes a period of time after the UV lamp is turned on before the light emission becomes stable.
3. For many instruments used to measure curing energy, in many cases, only one reading is concerned. For example, according to production experience, under the energy of 1000mJ/cm2 measured by a certain instrument, the curing is good. Maybe this instrument is very different from the national standard, but you As long as you know that the instrument measures 1000mJ/cm2, it is normal. At this time, you should only pay attention to the annual rate of change of the instrument, or add a correction factor to the instrument according to the data given in the calibration certificate, and record a reading again after correction.
4. Not all instruments can be calibrated according to the existing national standards, so when the instrument is detected to have a large measurement error, please confirm whether the measurement band of the instrument is consistent with the national standard, if not, or send it back to the original Factory inspection, or after correction according to the calibration certificate, use as reference.
5. Due to the particularity of the detector material of the ultraviolet radiation meter, the annual change rate is still relatively large (especially domestic instruments, foreign instruments are relatively good), coupled with frequent use, it is easy to produce value drift, If there is doubt about the value, it is best to send it for inspection in time.
6. Pay attention to the service life of the ultraviolet radiation meter, especially for the ultraviolet radiation meter that is close to the service life or used beyond the period, it should be used as a reference.
7. For some special radiometers that measure large range (such as W or J level) and special wave bands (such as UVV band visible light radiation), there is no verification procedure for the time being, and they can be sent to the original factory, the National Metrology Institute and other units for inspection calibration.
Finally, let me briefly talk about C-band instruments. This type of instrument is mainly used in the medical field, because short-wave ultraviolet rays are effective, and the measurement range is relatively small. Most of these instruments are domestically produced and have a high degree of consistency with the national standard.
