快速、高精度可见光-近红外透射光谱测量技术研究(英文)

Fast and High-Accuracy Measuring Technique for Transmittance Spectrum in VIS-NIR

基于传统分光光度测量方法的构架,提出了一种快速、高精度测量可见光-近红外透射光谱的新方法,在该方法的测量过程中,光栅单色器的出射波长保持匀速的连续变化,同时参考光探测器和测试光探测器保持连续的光强采集。初步实验研究表明,新方法可把测量耗时降低到传统分光光度法所需时间的50%以下,测量得到的透射光谱与传统分光光度法的相对误差为0.070%,三次重复性测量的统计误差为0.042%。与现有常见可见光-近红外透射光谱的测量方法(分光光度法、CCD光谱仪法、傅里叶变换光谱仪法)相比,新方法同时具有以下优点:(1)有望显著提高可见光-近红外透射光谱的测量速度,从而应用于透射光谱的动态测量环境中;(2)具有较高的测量精度(0.1%~0.3%);(3)在测量过程中,系统的机械部件始终保持匀速的运动状态,测试系统因而具有较高的机械稳定性。

In this paper ,based on the framework of traditional spectrophotometry ,we put forward a novel fast and high-accuracy technique for measuring transmittance spectrum in VIS-NIR wave range ,in which its key feature was that during the measurement procedure ,the output wavelength of the grating monochromator was kept increasing continuously and at the same time ,the photoelectric detectors execute d a concurrently continuous data acquisition routine .Initial experiment result showed that the newly proposed technique could shorten the time consumed for measuring the transmittance spectrum down to 50% that of the conventional spectro-photometric method ,and a relative error of 0.070% and a repeatability error of 0.042% were generated .Com-pared with the current mostly used techniques （spectrophotometry ,methods based on multi-channel spectrometer and strategy using Fourier transform spectrometer） for obtaining transmittance spectrum in VIS-NIR ,the new strategy has at all once the following advantages .Firstly the measuring speed could be greatly quicken , and fast measurement of transmittance spectrum in VIS-NIR is therefore promising ,which would find wide application in dynamic environment .Secondly high measuring accuracy （0.1% ~0.3% ） is available ,and finally the measuring system has high mechanical stability because the motor of the grating monochromator is rotating continuously during the measurement .