Direct mercury analyzer can directly test samples without sample pre-treatment, which leads to the advantages of no reagent pollution, less sampling volume, high sensitivity, good precision, and low cost. Therefore, it is widely used to analyze mercury in food, drinking water, cosmetics, soil, etc. As the key equipment for analyzing mercury, the accuracy of a direct mercury analyzer is essential to ensure the accuracy and reliability of the test results of mercury, which has great significance for environmental monitoring and protection. This article developed a calibration method to evaluate the metrological characteristics of a direct mercury analyzer by studying its working principle. Multiple different types of direct mercury analyzers were selected for pre-testing, and national-certified reference materials were chosen as references. Critical parameters such as linear error, detection limit, and repeatability were selected as test items. The experimental results show that the method proposed and reference materials selected can effectively evaluate the metrological performance of the instrument, which is of great significance for the quality control and quantity traceability of direct mercury analyzers.
This article developed a calibration method to evaluate the metrological characteristics of non-amplified nucleic acid quantitative fluorometers, by studying the working principle of non-amplified nucleic acid quantitative fluorometer. Multiple different types of non-amplified nucleic acid quantitative fluorometers were selected for pre-testing and national certified reference materials are chosen as reference. Critical parameters such as indication error, repeatability, and correlation coefficient are selected as test items. The experimental results shows that, the method proposed and reference materials selected can effectively evaluate the metrological performance of the instrument, which is of great significance for the quality control and quantity traceability of non-amplified nucleic acid quantitative fluorometers.
A dual-axis numerical control rotary table is designed in this article to calibrate a dual-axis tilt sensor. The device comprises a swing axis and a rotating axis, which are used to produce tilts in two perpendicular directions. To achieve precise control of the motion mechanism and enhance positioning accuracy, the time-grating angular displacement sensors have been adopted as the feedback and measurement components in both axes of the device. The experimental results indicate that the error of the swing axis of this calibration device is ±1.5 arcsec, while the error of the rotation axis is ±1.0 arcsec, with a repeatability of less than 0.5 arcsec, which is suitable for the calibration of the majority of dual-axis tilt sensors.
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