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Ultrasonic arrays for monitoring cracks in an industrial plant athigh temperatures

机译:用于监测高温下工厂裂缝的超声波阵列

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A piezoelectric linear array structure has been designed tonoperate at temperatures up to 400°C for nondestructive testing ofnsteel components of a hot industrial plant. It is intended that thesenarrays be fixed permanently to the test subject so that known defectsncan be monitored by comparing measurements taken over a period of timenwithout needing to shut down the plant. The arrays are used in pairs:nthe transmitter is a phased array producing a variable angle steerednbeam, and a second array is used for receiving. The defect can benidentified from a series of scans collected from individual elements ofnthe second array. A simple monolithic array structure was used, based onna single crystal of lithium niobate and operating in the frequency rangen3 to 5 MHz. Prototype devices have 64 elements on a 0.5 mm pitch.nSimulated defects in steel blocks have been scanned at high temperaturesnto illustrate the arrays' capability for nondestructive testing. Thenresults suggest an accuracy better than 1 mm in finding the location ofncrack tips
机译:压电线性阵列结构已被设计成可在高达400°C的温度下进行操作,以对热工厂的钢部件进行无损检测。旨在将传感阵列永久性地固定在测试对象上,从而可以通过比较一段时间内进行的测量来监视已知缺陷,而无需关闭工厂。阵列成对使用:发射器是产生可变角度转向光束的相控阵,第二个阵列用于接收。可以从第二阵列的各个元素收集的一系列扫描中识别出缺陷。使用基于铌酸锂单晶并在3至5 MHz频率范围内工作的简单单片阵列结构。原型设备在0.5 mm的间距上具有64个元素。n已在高温下扫描了钢块中的模拟缺陷n以说明阵列进行无损检测的能力。结果表明,发现裂纹尖端的位置精度优于1毫米

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