Error analysis by numerical simulation for a three-color pyrometer assuming a blackbody spectrum and a wavelength- and temperature-dependent emissivity

A numerical method devised to test ratio pyrometers has been used to explore the fitting of a blackbody spectrum and an emissivity model that assumes linear wavelength dependence and arbitrary temperature dependence. The slope and intercept coefficients for the emissivity and the temperature form three unknowns. The equations for the output of the three channels can be solved simultaneously for the emissivity coefficients and the temperature at any given time using the corresponding measured channel outputs. The stability of the solution is tested as a function of the temperature and equipment characteristics.Paper presented at the Second Workshop on Subsecond Thermophysics, September 20–21, 1990, Torino, Italy.     

Time resolved temperature measurements in manufacturing

Fast surface temperature measurements are of high interest in manufacturing processes. They can be realised by radiation techniques. Main problems are various influences on the accuracy and the limited optical access of interesting measurement positions. Therefore a fast fibre-optic two-colour pyrometer with high local resolution has been developed which enables measurements of surfaces with unknown emissivities. This pyrometer has been applied in a turning process, where the fibre-optic enables different measurement positions to show the influences of cutting speed and tool wear on the temperatures.     

卧式真空热压烧结炉自动控制系统

介绍卧式真空热压烧结炉自动控制系统的组成、功能以及对科研、生产所产生的积极影响 ,并对系统的主要组成的调试作了较详细的说明 ,阐述了先进的检测技术和PLC在卧式真空热压烧结炉自动控制系统中的重要作用。     

基于OPC的凸度仪数据交互客户端开发

在凸度仪系统中,高温扫描仪用于实时测量热轧钢板的断面温度,所测得的温度数据用于对钢板厚度进行实时补偿,反馈给轧机调整板型。为实时获得钢板温度数据,需开发OPC客户端,与高温扫描仪的OPC服务器接口进行数据交互。本文介绍和分析了OPCDA规范,在VisualC++开发环境下,基于活动模板库实现了OPC客户端接口程序,可获取高温扫描仪的各数据项。温度数据传送给温度补偿模块进行厚度校正,获得了较好的校正效果。     

提高飞剪控制系统冬季稳定性的设计

介绍飞剪控制系统的控制原理和系统组成,重点阐述传统飞剪在冬季使用过程中准确性和稳定性降低的一般原因和国丰飞剪控制系统的程序设计经验。     

Studies on high-efficiency and high-precision orthogonal turn-milling-The effects of relative cutting speed and tool axis offset on tool flank temperature

The cutting-edge temperature on the flank face in dry turn-milling of medium carbon steel (ISO C45) is measured using a two-color pyrometer with an optical fiber. In turn-milling, undeformed chip geometry is complex due to its dependence on several factors including diameter of the cutting tool, number of tooth, diameter of the workpiece, tool-work revolution speed ratio, depth of cut, feed per tooth, tool axis offset, and the cutting distance. In this study, the undeformed chip is analyzed and visualized by the 3D-CAD system, and the effects of the cutting parameters in turn-milling, especially relative cutting speed and tool axis offset on tool flank temperature, are investigated. It is interesting that the relative cutting speed does not significantly affect the tool flank temperature, where it increases by approximately 20 °C at most when relative cutting speed increases from 124 m/min to 217 m/min. In addition, tool flank temperature varies by approximately 40 °C when the tool axis offset is changed from 0 mm to 9.2 mm due to the change in the undeformed chip geometry.     

中间包钢水红外连续测温系统研究

比较了钢水温度测量中的各类热电偶和辐射测温装置的优劣.报告了基于比色原理的红外钢水连续测温系统研究的理论成果和实验成果.     

应用高温固定点校准精密光电高温计

通过复现温度间隔相近的3个高温固定点黑体,可以实现0.65 μm高温计在900～2 500 ℃、0.9 μm 高温计在600～2 000 ℃范围内的内插,不确定度最好水平分别达到0.3～1.2 ℃和0.3～0.6 ℃(k=2)。通过其他非分度固定点黑体和高温变温黑体的验证,2种波长高温计与高温基准温标的一致性优于0.1 ℃。应用高温固定点可以满足精密光电高温计接近国际最高水平的校准,提升高温校准的不确定度水平。     

可调焦式光纤式比色温度计的研制

本文设计并研制了一种可调焦式光纤比色温度计，它与传统的光纤温度计相比有一重要特点：既可以精确瞄准与调焦，可测量非常小的目标。文中还介绍了仪器的其他部分设计与标定技术。     

快速凝固过程中的温度测量

设计了一种适用于深过冷液态金属快速凝固研究的宽量程简易外温度计，其测量范围为９２３－２２７３Ｋ，响应时间小于１ｍｓ，最小目标φ１．４ｍｍ，精度可达１％－２％，提出了一种分步恒温标定方法，在七种不同实验条件下对这一简易红外温度计和高精度ＮＱ０７／１３ＣＩＶ１２５－２Ｍ－ＥＳＰＵ红外测温系统进行了标定，由此导出一种简易标定法，并分析了提高快速凝固过程中测量精度的途径。