针对激光制造过程中的高温金属熔池光谱特征分析,提出采用CCD光栅检测光谱技术检测其分布。检测了钨灯、钠灯、氘灯和汞灯的光谱曲线,得到了其在对应特征波长处光强随波长的分布,根据检测结果对系统进行了波长校准。结果表明,系统有比较高的波长准确度,对连续光谱、线光谱均能实现较稳定的检测。结合激光制造的实际情况,避开强激光反射的影响,该系统将能用于激光制造过程中的熔池光谱检测,为进一步分析激光熔池动态信息提供新的技术手段。

In order to analyze spectrum characteristic of metal molten pool in laser fabricating,the method of CCD and raster measurement technique was developed. Spectrum of wolfram lamp,sodium lamp,deuterium lamp and mercury lamp were measured. The relation of light intensity distribution and wavelength was acquired. Wavelength calibration was carried out by the measurement results. It is shown that the system could measure constant spectrum and line spectrum at high precision. It can be used to measure and analyze molten pool characteristic in laser fabricating after further development.