Remote detection of vibrational features from an object is important for many short-range civil applications, but it is also of interest for long-range applications in the defense and security areas. The well-established laser Doppler vibrometry technique is widely used as a high-sensitivity, noncontact method. The development of camera technology in recent years made image-based methods reliable passive alternatives for vibration and dynamic measurements. We investigate and discuss the potential of high-speed imaging technique for medium- and long-range vibration detection. The sensitivity and the limitations of the method are experimentally investigated in comparison to the well-established Doppler vibrometry technique. As atmospheric turbulence is expected to become a limiting factor for long-range applications, imaging in the short-wave IR (SWIR) to mid-wave IR (MWIR) rather than in the visual range is advantageous due to the longer wavelength. We present experiments on the vibration detection from SWIR and MWIR image sequences, as well as additional experiments on the extraction of vibration signature under strong local turbulence conditions.

中文翻译：

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基于高速图像检测远程物体的振动特征

对物体的振动特征进行远程检测对于许多短距离民用应用而言很重要，但对于国防和安全领域的远程应用而言也很重要。完善的激光多普勒振动测定技术已广泛用作高灵敏度，非接触式方法。近年来，摄像头技术的发展使基于图像的方法成为振动和动态测量的可靠替代方法。我们研究并讨论了高速成像技术在中远程振动检测中的潜力。与公认的多普勒振动测量技术相比，该方法的灵敏度和局限性已通过实验研究。由于预计大气湍流将成为远程应用的限制因素，由于波长较长，因此在短波IR（SWIR）到中波IR（MWIR）中而不是在可视范围内成像是有利的。我们介绍了从SWIR和MWIR图像序列进行振动检测的实验，以及在强局部湍流条件下提取振动特征的其他实验。