透射式烟度计检定中若干问题的讨论

Discussion on Some Problems in the Verifioation of Opacimeters

对某些透射式烟度计测量界面显示的吸收比进行了分辨,无论吸收比值符号是“N”或“N_(s)”,在该界面中,其实质都是“标准光通道有效长度的吸收比值”。分析了换算造成N值测量范围不符合规程要求的原因,并提出正确的判断方法。通过对比国家标准的限值要求,提出计量“N_(s)”的建议。指出JJG 976-2010《透射式烟度计》中,K值示值不一致性计算存在的问题,提出合理建议。有利于检定人员准确理解各指标参数,以正确实施透射式烟度计的检定。

The absorptance displayed by the measurement interface of some opacimeters is resolved,whether the symbol of absorptance is"N"or"N_(s)",at this time,the absoplance of the estandard efctive optical path lenth is es-sentially the same.This paper analyzes the reasons that the measuring range of N does not meet the requirements of the verification regulations because of conversion of N,and gives the correct judging method.Through the compari-son of the limis of the national standard,gives sone suggestions on the measurement of"N_(s)".This paper points out the problems in the inconsistency calculation of K value in JJG 976-2010"Opacimeers",and puts forward some reasonable suggestions.It is helpful for the verification ofcer to understand each index paraneter accurately so as to cay out the verification of the opacimeters correctly.