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目的为评价传感器在不同颗粒物浓度下的准确度、精密度、稳定性及一致性,对其性能进行比对研究,并在比对的基础上对传感器的测试误差进行优化。方法在室内采用气溶胶发生器产生氯化钾粒子,用光散射法PM_(2.5)传感器和重量法进行平行测量,并对测量结果进行比对。实验共选取了5款常见的传感器,每款2台。用称重法仪器采集了20个人工尘样本,其PM_(2.5)质量浓度在70~300μg/m3范围内,相对湿度分为50%和75%两个水平。结果被测光散射法传感器的总不确定度在60%~100%之间,相对湿度对测试准确度有明显的影响,通过重量法和相对湿度的校正,大部分传感器的总不确定度能下降20%~30%。结论对于被测的5款光散射法传感器,其测量总不确定度没有达到GB/T 18204.2—2014《公共场所卫生检验方法:第2部分》的要求,通过实验校正能部分改善测量准确度,但仍需重视传感器本身精密度的提升。
OBJECTIVE To evaluate the accuracy, precision, stability and consistency of sensors under different particle concentrations, the performance of the sensors was compared and the error of the sensors was optimized based on the comparison. Methods The potassium chloride particles were produced by aerosol generator indoors. The PM_ (2.5) sensor and gravimetric method were used for parallel measurement and the results were compared. The experiment selected a total of 5 common sensors, each 2. Twenty artificial dust samples were collected by weighing method. The PM_ (2.5) mass concentration was in the range of 70 ~ 300μg / m3 and the relative humidity was divided into two levels of 50% and 75%. Results The total uncertainty of the sensor under light scattering was between 60% and 100%. The relative humidity had obvious influence on the test accuracy. Through the calibration of gravimetric method and relative humidity, the total uncertainty of most sensors Decline 20% ~ 30%. Conclusion For the five light scattering sensors tested, the total uncertainty of measurement did not meet the requirements of GB / T 18204.2-2014 Public Health Sanitation Test Method: Part 2, and the accuracy of measurement can be partially improved by experimental calibration. But still need to pay attention to the sensor itself to enhance the precision.