For months after his discovery Dr Bhathal scanned the skies for a second signal to see whether it was just a glitch in his instrumentation but his search came to nothing.
So, the pyroelectric sensor that is located on the moving track of the infrared focus is scanned by the infrared focus signal continuously and generates the autonomous sampling pyroelectric signal.
这样，安装在红外光焦点运动轨迹上的热释电敏感元件被红外光焦点不断扫描而产生自主采样的热释电信号。
3
For large probe beam divergence the SNR is relatively poor, and even a streaky signal process is predicted if a point target is scanned across.