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Laser vibrometry from a moving ground vehicle

机译：移动地面车辆的激光测振

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We investigated the fundamental limits to the performance of a laser vibrometer that is mounted on a moving ground vehicle. The noise floor of a moving laser vibrometer consists of speckle noise, shot noise, and platform vibrations. We showed that speckle noise can be reduced by increasing the laser spot size and that the noise floor is dominated by shot noise at high frequencies (typically greater than a few kilohertz for our system). We built a five-channel, vehicle-mounted, 1.55 (mu)m wavelength laser vibrometer to measure its noise floor at 10 m horizontal range while driving on dirt roads. The measured noise floor agreed with our theoretical estimates. We showed that, by subtracting the response of an accelerometer and an optical reference channel, we could reduce the excess noise (in units of micrometers per second per Hz~(1/2)) from vehicle vibrations by a factor of up to 33, to obtain nearly speckle-and-shot-noise-limited performance from 0.3 to 47kHz.
机译：我们研究了安装在移动地面车辆上的激光振动计的性能的基本限制。移动激光振动计的本底噪声包括散斑噪声，散粒噪声和平台振动。我们表明，可以通过增加激光光斑的大小来减少散斑噪声，并且本底噪声主要由高频处的散粒噪声（对于我们的系统通常大于几千赫兹）主导。我们建造了五通道，车载式，波长为1.55μm的激光振动计，以在泥泞道路上行驶时测量其在10 m水平范围内的本底噪声。测得的本底噪声与我们的理论估计相符。我们发现，通过减去加速度计和光学参考通道的响应，我们可以将车辆振动中的多余噪声（以每秒Hz〜（1/2）的微秒/秒为单位）降低多达33倍，以获得从0.3到47kHz的近斑点和散粒噪声限制的性能。

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