The theory and experiment techniques about measuring the thermal diffusivity of solid materials by using laser induced transient reflecting grating is introduced.

阐述了用脉冲激光引发瞬态热反射栅的方法来测量固体材料热扩散率的理论、实验装置和实验技术。

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The article touches upon the principle of displacement measuring system consisting of diode laser focusing lens, reflecting main scale grating, quarternary index scale grating photosensor.

系统由半导体激光器、聚焦镜头、反射式标尺光栅、四裂相指示光栅和光电接收元件组成。

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As a sensor element, fiber optic and grating transformed the information into reflecting wavelength shift. It also named wavelength demodulation which is immune for light power waving and system loss.

作为传感元件，光纤光栅将被测的信息转化为其反射波长的移动，即波长解调，因此不受到光功率波动和系统损耗的影响。

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