Development of a High-Speed Spectrophotometer for the Diagnosis of High Temperature Materials and Flames in Actual Environments of Industry

本研究的目的是开发一种实验方法来研究实际工业环境中材料的热辐射特性的暂态行为。针对固体材料的特点，首先研制了高速光谱仪系统。该系统可由一个系统连续覆盖近紫外区到红外区的宽光谱区域。在小于1.5 S的周期内，重复测量了0.35-10.0&lt；u&gt；m的65个波长点的光谱，制备了近垂直入射镜面反射比和近半球入射正常反射比光学元件。研究了金属材料在高温氧化过程中热辐射特性的瞬变行为。在随后测量的镜面反射和漫反射光谱中，清楚地观察到了辐射的干涉和绕射。阐明了表面微观结构与光谱之间的相互关系，并讨论了这种转变的机理。该方法不仅适用于辐射换热的实验研究，而且适用于其他领域的实验研究、高温设备的安全管理和制造过程中的质量控制。另外，本文还开发了一套用于测量火焰中高温气体和颗粒的温度和浓度分布的系统。该系统覆盖2.2-4.5微米的光谱区域，根据第一个系统上的信号操作和电气控制子系统而定。对红外活性气体和粒子的光谱行为进行了精细测量。通过数值和实验分析，验证了该方法的可行性。

The purpose of the present research is to develop an experimental methodology to study the transient behaviors in thermal radiation characteristics of materials in actual environments of industry. High-speed spectrometer systems are developed firstly, for the characteristics of solid materials. The system is designed to cover a wide spectral region of the near-ultraviolet to infrared continuously by one system. It measures the spectra of 65 wavelength points at 0.35-10.0 <mu> m repeatedly within a period less than 1.5 s. Optics for the near-normally-incident specular reflectance and the near-hemispherically-incident normal reflectance are prepared. A study is performed on transient behaviors in thermal radiation characteristics of metallic materials in an oxidation process at high temperatures. The interference and diffraction of radiation are observed clearly in the subsequently measured spectra of the specular and diffuse reflection. Interrelations between the microscopic structure of surfaces and the spectra are clarified, and the mechanism of the transition is considered. The obtained knowledge on the systematic transition in radiation characteristics gives us a positive aspect for the applicability of the present method to the experimental studies not only on radiation heat transfer but those in other fields of heat transfer , safty management of high temperature installations and/or quality control in manufacturing processes.Another system is developed to apply the above methodology to the measurement of the distributions of temperature and concentration of high temperature-gases and particles in a flame. The system covers a spectral region of 2.2-4.5 <mu> m, with depending the signal-operating and electric-control sub-systems on the first system. The spectral behaviors of the infrared-active gases and the particles are measured finely. A numerical and experimental analyses are examined, todemonstrate the possibility of the proposed method.