光譜儀通過光纖可測量物體表面反射的光線。陽光中的七色光是肉眼能分的部分(可見光),但若通過光譜儀將陽光分解,按波長排列,可見光只占光譜中很小的范圍,其余都是肉眼無法分辨的光譜,如紅外線、微波、紫外線、X射線等等。通過光譜儀對光信息的抓取、以照相底片顯影,或電腦化自動顯示數值儀器顯示和分析,從而測知物品中含有何種元素。
The spectrometer can measure the light reflected by the surface of the object through the fiber. The sunlight in the seven-color light is the part of the naked eye (visible light), but if the decomposition of the sun by the spectrometer, according to the wavelength, visible light only a small range of the spectrum, the rest are indecent resolution of the spectrum, such as infrared, , Ultraviolet rays, X-rays, and the like. Through the spectrometer to capture the optical information to the photographic film development, or computerized automatic display of numerical instruments display and analysis, so as to know what kind of elements in the article.