本論文以FPGA建構超聲波影像掃描系統及設計非浸水式掃描機構來進行超聲波探傷。利用FPGA晶片之高整合度與靈活性來進行即時運動監控、聲波觸發、訊號擷取及資料分析。以最精簡資料量回傳降低系統負荷，可使主機專於與人機互動提升系統效能。在非浸水式掃描上為以簡潔機構設計來進行易鏽蝕物品之非破壞性檢測。
本掃描系統以FPGA實現可多分層及可平整度修正之超聲波訊號量測。在FPGA中使用兩段式訊號分析，利用表面偵測功能即時量測修正平整度0.23 mm或傾斜5.2度內之試片，並將訊號進行100連續窗格切割實現多層掃描。系統可使用掃描模式為A-scan、B-scan、P-scan、C-scan、X-scan、G-scan及S-scan。系統垂直掃描解析度為3 μm，水平解析度為20 μm，複雜大曲率試片為50 μm。系統掃描速度最高可達2 m/s，額定掃描取樣率最高為22 kHz，平均取樣率為8 kHz，不遜於市售一般超聲波掃描機台。
在非浸水式掃描上，量測試片表面只需極微量水耦合即可進行 220 mm×220 mm大範圍平面掃描，在小範圍內其解析度與影像品質與浸水式掃描相同，但大範圍試片如水平度不足時會有垂直訊號偏差發生。

This study constructs a Field Programmable Gate Array (FPGA) based non-destructive inspection system and a non-immersion ultrasonic scanning device. The inspection system exploits the high integration and flexibility of FPGA for real-time motion monitoring, acoustic trigger, data acquisition and signal analysis and reduces the host system loading by sending shortest data. Furthermore a concise concept of non-immersion ultrasonic scanning device is designed for non-destructive testing specimen that is apt to rust.
This scanning system realizes a multiple profile and flatness correction ultrasonic signal measurement with FPGA chip. The FPGA programs use 100 multiple gates to split signal for realizing multiple profiles and two-step analysis to fix the sample’s flatness problem. The available scanning modes include A-scan, B-scan, P-scan, C-scan, X-scan, G-scan, and S-scan. A horizontal deviation less than 0.23 mm or 5.2 degree can be fixed by the surface detection function in the FPGA.
The maximum scanning speed reaches 2000 mm/s. The vertical and horizontal scanning resolution of simple specimen is 3 μm and 20 μm respectively and the horizontal scanning resolution of complex large curvature specimen is 50 μm. The nominal sampling rate is 22 kHz and the average sampling rate is 8 kHz. Its performance is compatible with some commercial models of ultrasonic inspection systems.
For non-immersion scanning, a special device is developed in order to couple the specimen surface with very little water for scanning over a 220 mm × 220 mm large area. The results of non-immersion and immersion resolution and image quality are quite the same. However, if the specimen is not well leveled over a wide range, the signals will show vertical deviations.

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