薄膜材料横向热扩散率的热辐射检测

利用薄膜材料横向尺寸远大于其厚度的特点，通过测量横向传播热波的幅值和相位来确定薄膜的热扩散率是可行的，本文介绍带有背衬的薄膜的横向热扩散率的检测理论，以及利用非接触的热辐射技术对金刚石－硅复合膜的检测结果。     

横向激光光热偏转相位法测量金刚石薄片的热扩散率

本文介绍横向激光光热偏转装置的优化设计及其利用相位信息测量CVD金刚石薄片的热扩散率,并和脉冲激光光热辐射方法测量的结果相比较.     

各向异性材料的热扩散率的分析

在理论上分析了各向异性材料的热扩散率，给出了沿表面任意方向的热扩散率与主热扩散率的关系，从而为实验确定材料中任意方向的热扩散率提供了理论依据。     

线性调频光声检测薄膜材料的热扩散率

在光声检测中,对激光强度作线性调频调制是一种兼有脉冲和单频调制优点的一种宽带调制技术.它比伪随机噪声编码调制具有更宽的频带,它的自相关函数也更接近于δ函数.在光声检测中,它已用来检测试样的脉冲响应或频率响应,并由此而确定材料的力学、热学特性.本文将简述该方法的基本原理及对薄膜材料热扩散率的测量结果.     

采用激光光热透射技术测量材料的热扩散率

介绍利用激光光热透射技术测量材料热扩散率的方法，用该方法测量黄铜，纯铁、铝、纯铜及锗的热扩散率，其结果与能常采用的检测手段一致。     

PTR技术测量材料的热扩散系数的线性化方法

报道了一种用光热辐射 (PTR)技术测量不透明材料热扩散系数的优化方法。从光热辐射理论出发 ,在一定条件下 ,推导出位相信号和调制频率的关系表现为线性关系 ,分析实验数据得出材料的热扩散系数。     

碳纳米管纤维及薄膜的热导率和热扩散率研究

宏观碳纳米管(Carbon nanotube,CNT)薄膜的成功制备是发展有机热电材料的一个重要方向。由于CNT薄膜厚度仅为200 nm且多孔、粗糙度大,对其热学特性表征极为困难。本文提出应用3ω技术测量由单壁(Single-walled,SW)CNT薄膜卷曲成的宏观纤维的热导率和热扩散率,讨论了卷曲层数对结果的影响及估算薄膜面向热导率和热扩散率的思路。所研究的两个SWCNT薄膜的面向热导率为3.4 W/(m·K)和2.0 W/(m·K),热扩散率为24 mm~2/s和21mm~2/s。结果表明SWCNT薄膜将为发展低成本有机热电材料领域做出贡献。     

光声技术在固体材料热扩散率测量中的应用

光声（光热）效应是由于物质吸收一强度随时间变化的光束而被时变加热时所引起的一系列热效应和声效应,研究了这些热效应和声效应,可以获得物质的热学和学学性质,光声技术正是探测由于吸收光辐射后样品的微小温度变化所引起的周围气体压力变化,具有灵敏度高、操作方便、应用广泛等独特的优点,已成为研究物质光谱特性、热学性质等的独特有力手段,文章主要介绍了光声技术在固体热扩散率测量中的原理及常规应用方法。     

红外热波成像法测量固体材料热扩散率

本文通过采用连续激光调制对试样周期加热产生稳定的温度波动和红外扫描动态测温的红外热波成像法获得温度波动的相位和幅值分布，测量固体材料热扩散率。介绍了红外热波成像法的测量原理和实验系统，推导了热扩散率测量的相位法、幅值法和相位－幅值复合法。对不锈钢和纯镍试样的热扩散率进行了测试。测量结果表明，该方法具有较高的精度。     

一种光声检测材料热扩散率的新方法

本文介绍采用前表面激发的光声检测材料热扩散率的新方法及其检测原理。用该方法对纯铁、纯铜、黄铜、铝以及人造金刚石砂粒的热扩散率测定结果表明,它与通常背激发的光声技术和激光导热仪的测量结果是一致的。     

Measurement of the normal thermal diffusivity of a dielectric film by a pulsed photoacoustic method

A method of determining the thermal diffusivity of a thin film of a transparent dielectric in the direction normal to the surface has been developed. It is based on excitation of reflecting dynamic gratings. The effectiveness of the method is checked experimentally with the example of a thermally oxidized submicron SiO₂ film on a silicon substrate. The temperature dependence of in the range 290–420 K is measured. The possibilities of setting up thermal measurements of films tens of nanometers thick and its problems are discussed.Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 71, No. 6, pp. 793–797, November–December, 2004.This revised version was published online in April 2005 with a corrected cover date.     

采用光热辐射计量术测量固体材料的光谱吸收系数

本文采用一种新的测试技术——光热辐射计量术(PTh),对固体材料进行非接触式光谱研究,文中介绍了光热辐射计量理论,并在实验上获得Ce_2O_3粉末和果树叶的相对光谱吸收系数.     

Noncontact measurement of the thermal diffusivity of IR semi-transparent and semiconducting n-CdMgSe mixed crystals by means of the photothermal radiometry

In this paper we present results of noncontact measurements of the thermal diffusivity of infrared semi-transparent n-CdMgSe mixed semiconductor crystals by means of the photothermal radiometry (PTR) in a transmission configuration. In order to overcome an influence of the infrared semi-transparency and plasma waves on the PTR signal from n-CdMgSe mixed crystals the samples were covered by thin aluminum foils on both sides. The thermal diffusivities of n-CdMgSe mixed crystals were estimated from PTR phase frequency characteristics using a well-known formula. It was found that the obtained results are underestimated in comparison to thermal diffusivities estimated from the PPE (photopyro-electric) measurements. A three layer model of a PTR signal was applied in order to estimate an error in determination of the thermal diffusivity of a sample caused by aluminum foils.     

用激光引发热反射栅方法测量固体热扩散率

阐述了用脉冲激光引发瞬态热反射栅的方法来测量固体材料热扩散率的理论、实验装置和实验技术．给出用该实验方法测得的纯硅和纯铜的热扩散率，并与文献数据进行了比较，结果表明该方法是一种适用于不透明固体材料热扩散率测量的无损、快速和准确的方法．     

Measurement of surface absorption in optical materials by the method of laser photothermal radiometry

The present work is devoted to the development of the method of laser photothermal radiometry with a view to increasing its spatial resolution over the depth of the specimen when surface layers of the substance of thickness about 1 μm or less are to be investigated. As an example, results of an investigation of radiation absorption in the surface layer of a lithium niobate crystal are presented. The absorption index measured at a wavelength of 1.08 μm was ∼0.6 cm⁻¹. “Polyus” Research Institute, 3, Vernadskii Ave., Moscow, 117342, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 82–84, January–February, 1997.     

Differential temperature sensors method for simultaneous determination of thermal conductivity and diffusivity

An attempt has been made to minimize the sources of error involved in the transient probe method for thermal conductivity determination. Two sensors (thermocouples) are mounted parallel to the needle probe at known distances. This modification makes it a device for simultaneous conductivity and diffusivity determination. Thermal conductivity and diffusivity for glycerine, dune sand and mustard seed are determined by this method. Results obtained are compared with those obtained by a calibrated transient probe for conductivity and by a parallel wire method for diffusivity. Analysis of the results prove it to be a better instrument over the traditional ones. The technique can also be used as a direct reading device for conductivity and diffusivity measurements.     

热蒸发YbF3薄膜的机械特性

 实验研究了热蒸发YbF₃薄膜在大气中的应力和附着力。利用Veeco干涉仪,测试了各种工艺条件下单层YbF₃薄膜的应力。结果发现:YbF₃薄膜的残余应力为张应力,热应力在残余应力中的比重较大;沉积方式对薄膜应力的影响不大;薄膜应力在大气中有一个释放的过程。热处理后,YbF₃薄膜应力增大。     

Measurement of thermal parameters of a heat insulating material using infrared thermography

The article presents results of research developing methods for determining thermal parameters of a thermal insulating material. This method applies periodic heating as an excitation and an infrared camera is used to measure the temperature distribution on the surface of the tested material. The usefulness of known analytical solution of the inverse problem was examined in simulation study, using a three-dimensional model of the heat diffusion phenomenon in the sample of the material under test. To solve the coefficient inverse problem an approach using an artificial neural network is proposed. The measurements were performed on an experimental setup equipped with a ThermaCAM PM 595 infrared camera and a frame grabber. The experiment allowed verification of the chosen 3-D model of the heat diffusion phenomenon and proved suitability of the proposed test method.