Optical sensing applications are usually reliant on the intensity of the measured signal. For remote sensing applications where a target is probed with a laser beam, the sensitivity will be limited by the amount of backscattered light returned from the target to the detector. We demonstrate a method of increasing the signal returned to the detector by illuminating the target with a number of independently controlled beams, where both the position and phase are optimised. We show an improvement in the backscattered signal that is proportional to the number of beams used. The method is demonstrated within a laser microphone, measuring audio signal due to vibrations in surfaces, showing a significant improvement in the signal-to-noise of the measurement.

中文翻译：

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优化多光束干扰造成的反向散射

光学传感应用通常依赖于被测信号的强度。对于使用激光束探测目标的遥感应用，灵敏度将受到从目标返回到检测器的反向散射光量的限制。我们演示了一种方法，该方法通过使用多个独立控制的光束照亮目标来增加返回到检测器的信号，其中位置和相位都得到了优化。我们显示出反向散射信号的改善与所使用的光束数量成正比。该方法在激光麦克风中进行了演示，可以测量由于表面振动而产生的音频信号，从而显着改善了测量的信噪比。