摘要
基于平行热线法的测量原理,在加热电路中串联一个限流电阻,使加热过程中由于热线温升引起电阻增大造成的功率变化减小至0.6%,提高测量精度;采用铂电阻温度传感器代替传统的热电偶实现温度测量,用于低温下的温度测量,扩大导热系数测量范围。采用这种测量方法,搭建绝热材料导热系数的测量平台,测量硬质聚氨酯泡沫塑料的导热系数,与国家玻璃纤维产品质量监督检验中心的鉴定结果对比,其相对误差在5%以内,验证了改进的平行热线法的正确性。
Based on the measuring principle of parallel hot wire method,a current limiting resistor is cascaded in the heating circuit to reduce the power variation to 0. 6%,which is caused by resistance increases due to the hotline temperature rise in heating process,with the measurement accuracy improved. Platinum resistance temperature sensor is used to replace the traditional thermocouple to achieve temperature measurement,which can be used in low temperature and expand the scope of the thermal conductivity measurement. Ameasuring platform of insulation material＇s thermal conductivity is built,with the thermal conductivity of rigid polyurethane foam measured. Compared with the identification results of National Glass Fiber Product Quality Supervision and Inspection Center,the relative error is less than 5%,so the correctness of the improved parallel hot wire method is verified.
出处
《世界科技研究与发展》
CSCD
2015年第2期118-121,146,共5页
World Sci-Tech R&D
基金
工信部高技术船舶科研计划"新型液化天然气船液货围护系统预先研究"项目资助
关键词
平行热线法
绝热材料
测量
导热系数
限流电阻
铂电阻
parallel hot-wiremethod
insulating material
measure
thermal conductivity
current-limiting resistance
platinum resistance
