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Development of high temperature ultrasonic 2-D array sensor and its application to solidification monitoring for molten metals

高温超声波二维阵列传感器的研制及其在熔融金属凝固监测中的应用

基本信息

批准号：
17360351
负责人：
IHARA Ikuo
金额：
$ 9.66万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360351/
关键词：
ultrasound 2-D array sensor molten metals monitoring solidification high temperature measurement aluminum buffer rod sensor

项目摘要

Development of a high temperature ultrasonic 2-D array sensor and its application to solidification monitoring of molten metals have been studied. The main results obtained are the following:(1) Conventional ultrasonic 2-D array sensors have been examined to verify the capability and feasibility of ultrasonic imaging in a water environment at room temperature. The results have showed that the use of the conventional technique using a 2-D ultrasonic array transducer (8×8, 16× 16)coupled with a bulk buffer medium cannot be used for molten metal monitoring because of its poor spatial resolution and time consuming for imaging. It is therefore suggested that a high performance ultrasonic buffer rod and relating techniques should be used for fabricating a high temperature ultrasonic array sensor.(2) A high temperature ultrasonic sensor with a tapered clad buffer rod is designed using a numerical simulation technique (FDM) and its ability for a solidification process monitoring of a molten aluminum alloy has been demonstrated. The temperature distribution around the probing end of the buffer rod sensor in the molten aluminum has also been evaluated by a numerical calculation (FEM). It is found that the ultrasonic buffer rod sensor is a powerful element that can be used for fabricating the ultrasonic array sensor.(3) A long buffer rod sensor of 1 m length has been designed and fabricated, and then the laboratory validation of the use of such long sensor for molten metal monitoring has been examined. In addition, surface roughness evaluation methods based on reflection and scattering phenomena have been developed to evaluate surface topography quantitatively. It is expected that such roughness evaluation methods could be useful for monitoring and evaluating the surface morphology of a solidification interface of molten metals. It is therefore considered that the developed long buffer rod sensor is a promising candidate for constructing an effective array sensor.

研究了高温超声二维阵列传感器的研制及其在熔融金属凝固监测中的应用。主要研究结果如下：(1)对常规超声二维阵列传感器进行了测试，验证了在室温水环境下超声成像的能力和可行性。结果表明，使用传统的二维超声阵列传感器（8×8, 16× 16）与大块缓冲介质相结合的技术，由于其空间分辨率差且成像耗时长，不能用于熔融金属监测。因此，建议采用高性能的超声缓冲棒及相关技术来制作高温超声阵列传感器。(2)采用数值模拟技术（FDM）设计了一种带锥形包层缓冲棒的高温超声传感器，并验证了其对铝合金熔融物凝固过程监测的能力。采用数值计算方法对缓冲杆传感器探测端在铝液中的温度分布进行了分析。研究发现，超声波缓冲棒传感器是一种可用于制作超声波阵列传感器的强大元件。(3)设计并制作了1 m长的缓冲棒传感器，并对该长传感器用于熔融金属监测进行了实验室验证。此外，还发展了基于反射和散射现象的表面粗糙度评价方法来定量评价表面形貌。期望这种粗糙度评价方法可用于监测和评价熔融金属凝固界面的表面形貌。因此，认为所研制的长缓冲杆传感器是构建有效阵列传感器的理想选择。