一般的检测干粉灭火剂中含水率的分析操作复杂、实验条件严格，难以满足消防产品监督执法部门对灭火剂产品质量快速检测需求.为此，提出了一种光纤漫反射近红外光谱快速、无损测量ABC干粉灭火剂含水率的方法.采用偏最小二乘法结合47个ABC干粉灭火剂样品光谱，建立了ABC干粉灭火剂含水率的校正模型，对光谱预处理和光谱区选择进行了讨论.含水率模型校正集相关系数为0.976，交互验证校正标准偏差为0.037 1，验证集相关系数为0.952，预测标准偏差为0.021 6，预测范围为: 0.075%~0.334%.随机抽取6个样品进行χ2检验，在95%置信水平下，重复性标准偏差属于同一总体，相对标准偏差均小于7.0%.结果表明，近红外光谱法可以用于干粉灭火剂含水率的快速检测.

Usual analytical methods are complex and require rigorous experimental condition. In order to meet the demand of fire product supervisory department in rapidly detecting the quality of dry chemical, a rapid and nondestructive method was proposed to determine the moisture content in ABC dry chemical using near infrared spectroscopy of fiber diffuse reflection. The calibration models were established for determination of moisture content of ABC dry chemical by partial least squares and 47 ABC dry chemical sample spectra. Spectral data preprocessing and Spectral region selection were discussed. Correlation Coefficient of Calibration Set of the model was 0.976, root mean square of error cross validation was 0.037 1, correlation coefficient of prediction set was 0.952, and root mean square error of prediction was 0.021 6 in the predicted rang of 0.075%~0.334% for moisture content of ABC dry chemical. Using the Chisquare test method, repeatability standard deviation measurements all belonged to the same overall at a 95% confidence level. All the relative standard deviations were less than 7.0%. The near infrared spectroscopy method is used to test the moisture content of ABC dry chemical is feasible.