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作 者:王智宏[1] 刘杰[1] 孙玉洋[1] 滕飞[1] 林君[1]
机构地区:[1]吉林大学仪器科学与电气工程学院,吉林长春130026
出 处:《光谱学与光谱分析》2013年第4期963-967,共5页Spectroscopy and Spectral Analysis
基 金:吉林省科技发展计划项目(20116014);国家潜在油气资源(油页岩勘探开发利用)产学研用合作创新项目子课题(OSR-02-04)资助
摘 要:便携式近红外光谱仪器测量低反射率或透过率样品的漫反射率或透过率光谱时,由于仪器噪声的影响,光谱数据小、信噪比低,即使采用降噪数据处理,所得光谱数据仍无法满足分析精度的要求。因此研究了近红外等效光谱测量方法:根据低反射率或透过率样品在常规测量条件下反射信号的强度,增大仪器测量时光源电流以增大样品扫描信号、减小参比反射或透射光强以避免参比信号超量程,并计算得与常规测量方法相同的等效光谱,以提高样品近红外反射率或透过率光谱数据的信噪比。理论分析和实验结果表明采用近红外等效光谱测量方法,可获得与常规测量方法的光谱数据相同、且信噪比增大的等效光谱。When the spectra of the diffuse reflectance of low reflectivity samples or the transmittance of low transmisivity samples are measured by a portable near infrared(NIR) spectrometer,because there is the noise of the spectrometer,the smaller the reflectance or transmittance of the sample,the lower its SNR.Even if treated by denoise methods,the spectra can not meet the requirement of NIR analysis.So the equivalent spectrum measure method was researched.Based on the intensity of the reflected or transmitted signal by the sample under the traditional measure conditions,the light current of the spectrometer was enlarged,and then the signal of the measured sample increased;the reflected or transmitted light of the measure reference was reduced to avoid the signal of the measure reference over range.Moreover the equivalent spectrum of the sample was calculated in order to make it identical with the spectrum measured by traditional method.Thus the NIR spectral SNR was improved.The results of theory analysis and experiments show that if the light signal of the spectrometer was properly increased according to the reflected or transmitted signal of the low reflectivity or transmisivity sample,the equivalent spectrum was the same as the spectrum measured by traditional method and its SNR was improved.
关 键 词:便携式近红外光谱仪器 等效光谱 测量方法 信噪比 光源亮度可控
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