用于材料无损检测的毫米波多普勒传感器
Millimeter Wave Doppler Sensor for Nondestructive Evaluation of Materials
摘要：
共振模式是物体在这些频率下激发时的固有特性。探测共振特征可以揭示关于材料成分、几何形状、缺陷的存在以及被测物体的其他特性的有用信息。振动频谱可以使用毫米波（mmW）多普勒传感器和远程激励源以高灵敏度远程测量。这种新的无损评价（NDE）方法可以在非接触的方式作为替代或补充的方法，传统的NDE方法，如那些基于声学/超声和光学技术。毫米波振动测量可用于广泛的民用和国家安全应用。例子包括检测缺陷和退化，用于材料组件的诊断和特性分析，以及对屏蔽/密封容器进行违禁品的快速隔离检查。在本文中，我们评估的性能紧凑的毫米波测振仪在阿贡。我们的94 GHz的I-Q多普勒传感器监测的机械振动签名的对象在询问下，是由连续波激励引起的。对于原理验证演示，测试对象通过电子控制的振动器使用DC至200 Hz范围内的各种频率的正弦波进行机械激励。我们将提出一些实验室测试结果，并将讨论该方法的适用性，一些实际的无损检测应用。
英文摘要：
Resonance modes are intrinsic characteristics of objects when excited at those frequencies. Probing the resonance signatures can reveal useful information about material composition, geometry, presence of defects, and other characteristics of the object under test. Vibration spectra can be measured remotely with high degree of sensitivity using a millimeter wave (mmW) Doppler sensor and a remote excitation source. This novel nondestructive evaluation (NDE) method can work in a non-contact manner as an alternative or complementary approach to conventional NDE methods such as those based on acoustic/ultrasonic and optical techniques. Millimeter wave vibrometry can be used for a wide range of civil and national security applications. Examples include detection of defects and degradation for diagnostics and prognostics of materials components and rapid standoff inspection of shielded/sealed containers for contraband. In this paper, we evaluate the performance of a compact mmW vibrometer developed at Argonne. Our 94 GHz I-Q Doppler sensor monitors the mechanical vibration signature of the object under interrogation that is induced by continuous wave excitation. For proof-of-principle demonstrations, the test objects were mechanically excited by an electronically controlled shaker using sinusoidal waves at various frequencies ranging from DC to 200 Hz. We will present a number of laboratory test results and will discuss the method's applicability to some practical NDE applications.
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