基于激光热成像的局部导热系数测试
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浙江省自然科学基金项目(No.LY18F030011)资助


Local thermal conductivity measurement based on laser thermography
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    摘要:

    导热系数是表征材料传热能力的基本参数,与材料种类及成型过程中的温度、压力等工艺参数密切相关,因此制样测试可能无法反映真实产品特性,需要适用于不规则形状样品的局部导热系数测试技术。提出一种基于激光热成像的测试方法,通过减小传热时间来保证热响应仅对局部区域材料敏感,通过高分辨热像仪记录的温度场演变数据同时反演光斑分布和材料导热系数。使用粉末成型铁氧体样品进行实验验证,对规则样品进行10次重复实验,相对标准差为2.3 %,均值与Hot-Disk法测试结果的相对偏差为0.1 %;对不规则形状样品3个位置进行测试,最大相对偏差1.6 %。该方法有望用于不规则形状、小尺寸、非均匀材质部件的原位无损测试。

    Abstract:

    Thermal conductivity is a basic parameter to characterize the material′s heat transfer ability.It is closely related to the type of material and process parameters such as temperature and pressure during the molding process.Therefore,the sample preparation test may not reflect the characteristics of the real product,and it needs to be suitable for the local thermal conductivity of irregularly shaped samples.A test method based on laser thermal imaging is proposed to reduce the heat transfer time to ensure that the thermal response is only sensitive to materials in a local area.The temperature field evolution data recorded by high-resolution thermal imaging simultaneously inverts the spot distribution and material thermal conductivity.The powder-formed ferrite samples were used for experimental verification.Ten repeated experiments were performed on the regular samples.The relative standard deviation was 2.3 %,and the relative deviation between the mean and the test results of the Hot-Disk method was 0.1 %.For the irregular-shaped samples,3 positions tested with a maximum relative deviation of 1.6 %.This method is expected to be used for in-situ non-destructive testing of irregularly shaped,small-sized,non-uniform material parts.

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张绩松,王晓娜,侯德鑫,叶树亮.基于激光热成像的局部导热系数测试[J].激光与红外,2020,50(12):1426~1432
ZHANG Ji-song, WANG Xiao-na, HOU De-xin, YE Shu-liang. Local thermal conductivity measurement based on laser thermography[J]. LASER & INFRARED,2020,50(12):1426~1432

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  • 在线发布日期: 2021-01-05
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