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Optical sensor to monitor and control temperature and build height of the laser direct-casting process

机译:光学传感器,用于监视和控制激光直接铸造过程的温度和高度

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摘要

A nonintrusive optical sensor system is applied to real-time process control of the recently developed laser direct-casting process, in which a stream of metal powder is introduced into the beam of a high-power (500-W) cw laser to fabricate complex three-dimensional structures. The sensor system allows two critical parameters, temperature and build height, associated with this process to be monitored and controlled continuously. We achieved a height-sensing resolution of +/-0.25 mm and temperature control with a resolution of +/-10 degrees C at a typical working temperature of 1500 degrees C with an evident improvement in process quality, especially for complex workpieces comprising relatively high, thin walls at which the conductive heat transfer varies substantially as the process proceeds. (C) 1998 Optical Society of America OCIS codes: 140.3390, 060.2370, 120.6780. [References: 5]
机译:一种非侵入式光学传感器系统应用于最近开发的激光直接铸造工艺的实时过程控制,该工艺中,将金属粉末流引入到高功率(500 W)连续波激光器的光束中,以制造复杂的三维结构。传感器系统允许连续监测和控制与此过程相关的两个关键参数,温度和成型高度。在典型的1500摄氏度的工作温度下,我们实现了+/- 0.25毫米的高度感应分辨率和+/- 10摄氏度的温度控制,明显改善了工艺质量,特别是对于包含相对较高工件的复杂工件薄壁,随着过程的进行,传导热传递的壁会显着变化。 (C)1998年美国光学学会OCIS编码:140.3390、060.2370、120.6780。 [参考:5]

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