固体材料热扩散率测量系统研究

Research on Thermal Diffusion Rate Measurement System of Solid Materials

研制了基于激光闪光法的热扩散率测量装置,利用机械泵和分子泵对炉内抽真空,之后对炉膛进行加热,采用大功率脉冲激光仪激励被测样品,样品受激光照射的面温度升高,热量开始传导向另一面,红外探测器实时记录此温升变化过程,温升信号经放大器放大后转换成电压信号输入至采集卡,采集卡与电脑软件进行通讯,自行编写的测量软件实时计算处理数据,分析得到样品的热扩散率值。利用该系统对标准样品在300~1300℃温度范围内进行了实验,测量重复性小于0.85%。

A device for measuring thermal diffusivity based on laser flash method is developed.The furnace is vacuum-pumped by a mechanical pump and a molecular pump, then heated.The measured sample is stimulated by high-power pulsed laser instrument.The temperature of the sample increases on the laser irradiation surface, and the heat begins to transmit to the other side.The infrared detector records the temperature rise process in real time and converts it into electrical signal to input in an amplifier.After amplification, the voltage signal is input to the acquisition card and communicates with the computer software.The self-compiled measurement software calculates and processes the data in real time, and then gets the thermal diffusivity value of the sample.The system is used to test the standard sample in the temperature range of 300 ~1300 ℃.The repeatability of the measurement is less than 0.85%.