Automatic Control of Interface Boundaries in Vertical FreezeProduction Processes

立式冷冻生产过程中界面边界的自动控制

• 批准号: 9001042
• 负责人: Michael Squillante
• 金额: $ 25万
• 依托单位: Radiation Monitoring Devices Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9001042&HistoricalAwards=false
• 关键词: Automatic; Control; Interface; Boundaries; Vertical

A key consideration in a variety of manufacturing processes is controlling either the position or shape of an interface defined as the boundary between liquid and solid materials of dissimilar composition or density to within certain allowable tolerances. Automating these processes requires the ability to monitor and maintain the critical growth interface parameters throughout an entire lengthy batch process using an appropriate process feedback control algorithm. A method will be developed to monitor and subsequently control an interface boundary using an appropriate gamma ray emitting radioisotope and a rugged semiconductor detector. Initial results obtained during the Phase I program indicated that this technique is effective. Further research on this method should lead to a commercially viable control system.

各种制造工艺中的一个关键考虑因素是将界面的位置或形状控制在某些允许的公差范围内，界面被定义为不同成分或密度的液体和固体材料之间的边界。 自动化这些过程需要能够使用适当的过程反馈控制算法在整个漫长的批处理过程中监控和维护关键的生长界面参数。 将开发一种方法，使用适当的伽马射线发射放射性同位素和坚固的半导体探测器来监测并随后控制界面边界。 第一阶段计划中获得的初步结果表明该技术是有效的。 对这种方法的进一步研究应该会产生商业上可行的控制系统。