The author takes light source of the rectangle optical spectrum as an example to calculate time relevant degree and briefly describes Fourier's spectroscopy principle.
以矩形谱线的光源为例，计算了时间相干度，简要介绍了傅里叶变换光谱学原理。
The system of the optical fiber sensor is designed using LED source as light source to obtain reflected spectrum.
建立了传感器系统，用LED作为白光光源得到反射光谱。
The six channel instantaneous optical pyrometer is used to measure the thermal radiation of the light source at six bands from visible to near infrared spectrum.
六通道瞬态光学高温计是在可见光和近红外光谱范围内，把光源的热辐射取出六个波段进行测量。
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