Holland Stephen D, Roberts Ron, Chimenti D E, Song Jun Ho
Center for Nondestructive Evaluation, Iowa State University, Ames, IA 50011, USA.
Ultrasonics. 2006 Dec;45(1-4):121-6. doi: 10.1016/j.ultras.2006.07.020. Epub 2006 Aug 17.
We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m(2) plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit board. Cross-correlations of signals from the array elements with signals from the single reference element provide a measurement of the leak noise passing through the spacecraft skin under the array. A spatial Fourier transform reveals the dominant direction of propagation. Triangulation from multiple sensor locations can be used to find the source of the leak.
我们已经开发出一种可用于定位载人航天器空气泄漏位置的超声阵列传感器，并发现该传感器能将1平方米板材上的泄漏位置定位在2厘米范围内。该传感器由一个63元件的多路复用阵列加上一个参考元件组成，所有这些都由单个PZT圆盘和一块印刷电路板构建而成。阵列元件的信号与单个参考元件的信号进行互相关，可测量通过阵列下方航天器蒙皮的泄漏噪声。空间傅里叶变换揭示了传播的主导方向。通过多个传感器位置进行三角测量可用于找到泄漏源。
