Laser Microphone
It’s all too easy to listen to someone’s conversation using little more than a laser beam. Laser microphones use a laser beam to measure the vibration of sounds on a surface, usually glass windows, transmitting those sounds back to the listener’s receiver. DIY instructions abound on the internet, including this tutorial by Lucid
激光竊聽器
用這個裝置發射激光束,通過監測窗戶玻璃的振動可以將其轉化為聲波,發送到監聽者的接收機上。印象中煎蛋發過但我找不到了。