Proposed a novel scheme to measure the Brillouin frequency shift and power change, and analyzed the measurement accuracy of Brillouin frequency shift.

提出了一种同时测量布里渊频移和功率变化的新方案，同时对系统的布里渊频移测量精度进行了分析。

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A new device which can change the optical frequency shift is described. It consists of a rotating grating, a synchro motor and a power supply whose frequency can be adjusted.

本文描述一台能改变光频移频率的新装置，它由旋转光栅、同步电机和调频电源组成。

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However, many devices work in the environment which the temperature changes in a larger range, the change of temperature will cause the crystal oscillator's frequency shift.

但是，许多设备工作在温度范围变化较大的环境中，由于石英晶体谐振器自身特殊的物理特性，温度的变化会导致晶体振荡器的频率发生偏移。

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And since a moving object causes a tiny change (known as a Doppler shift) in the frequency of the reflected signal, Silent Sentry can also calculate how fast it is moving.

ECONOMIST: Remote sensing