Thermal Conductivity, Diffusivity Instrument

在这个SBIR项目中，Vatell公司正在设计、建造和测试一台同时测量导热系数和扩散系数的原型仪器。该仪器结合了一个热通量微型传感器探头来测量热流和热电偶来测量表面温度。它是基于微处理器的，执行将探头和热电偶的瞬时信号分解为导热系数和扩散系数值所需的所有计算。为了测量材料的这些热物性，在仪器的试验室中放置一小块材料样品(大约2“正方形和1/2”厚)。操作员为测量探头选择初始温度。这种选择确定了样品的热性能将被确定的温度范围。将探头预热到该温度，然后自动与样品表面接触。微型传感器的信号代表进入样品的瞬时热流，热电偶信号代表探头表面温度的下降和样品表面的温度上升，由仪器数字化并记录下来。然后，微处理器计算并显示样品的导热系数和扩散系数。

In this SBIR project, Vatell Corporation is designing, constructing and testing a prototype instrument for simultaneously measuring thermal conductivity and diffusivity. The instrument incorporates a Heat Flux Microsensor probe to measure heat flow and thermocouples to measure surface temperatures. It is microprocessor-based, performing all calculations needed to resolve transient signals of the probe and thermocouples into values of thermal conductivity and diffusivity. To measure these thermal properties for a material, a small sample (approximately 2" square and 1/2" thick) of the material is placed in the test chamber of the instrument. The operator selects an initial temperature for the measuring probe. This selection establishes the range of temperatures over which the sample's thermal properties will be determined. The probe is preheated to this temperature and then automatically makes contact with the surface of the sample. The signal of the microsensor, representing transient heat flow into the sample, and the thermocouple signals representing the decreasing temperature at the probe face and the sample's surface temperature rise, is digitized and recorded by the instrument. The microprocessor then calculates and displays the thermal conductivity and diffusivity of the sample.