Analysis of the causes of poor measurement accuracy of ultraviolet radiation luminometer

"Analysis of the Reasons for the Poor Measurement Accuracy of the Ultraviolet Illuminometer" written by Li Zhenguo, a scholar from the School of Light Industry, Hebei University of Technology, describes five reasons for the low measurement accuracy of the ultraviolet illuminometer, including: (1) UV-based (standard) standards The uncertainty of the luminosity is several times higher than the uncertainty of the luminosity. (2) The spectral response characteristics of ultraviolet measuring instruments have no strict unified regulations at home and abroad. For visible light, as early as 1924, the International Commission on Illumination (CIE) announced the photopic spectral luminous efficiency V(λ), which can be corrected to be consistent with V(λ) by the combination of photoDetectors and filters, so , the measurement accuracy is high. (3) The probe of the ultraviolet radiation illuminance meter is less stable than the visible light probe under long-term ultraviolet light (especially strong ultraviolet light) irradiation and long-term storage. (4) There are many kinds of ultraviolet radiation sources, and the composition of their spectral components is often quite different, while the calibration of the ultraviolet radiation illuminance meter is carried out under the irradiation of a specific radiation source, which lacks universality for various ultraviolet radiation sources . (5) The geometric conditions in the application measurement are various, which are generally quite different from the geometric conditions in the calibration of the irradiance meter.

In addition, scholars focus on giving detailed quantitative evaluation methods for nonlinear response errors, directional response errors, temperature-dependent response errors, fatigue errors, and responses to visible radiation generated during measurement.

In the concluding remarks, the scholars put forward that in addition to the reasons for the poor measurement accuracy of the ultraviolet radiation illuminance meter described above and the quantitative evaluation of the measurement error, there are also the instability of the absolute spectral responsivity ; zeroing drift; the influence of the magnetic field; the range The error caused by the change ; the instability of the test instrument caused by the change of the power supply; the response time; the non-quantitative error caused by the shading of the observer, etc., should also be avoided and eliminated as much as possible.