扫描开始时间应以74秒前后为佳，持续观察时，扫描间隔时间宜长，且不会错过观察时机。
The best scanning time is about 74 seconds. On continuing observation, the scanning interval should be a little longer and it will not lose the time of observation.
热像仪扫描摆镜通常采用锯齿波形运动曲线，扫描频率和效率取决于回扫间隔时间。
The zigzag waveform movement curve is often used in the scanning mirror of thermal imager, so its performance and frequency are limited by the delay time of returning movement.
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