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一、引言许多光测仪器,如分光光度计,红外可见吸收光谱仪,散射光谱仪等,在测量过程中,光源强度对测量结果有很大影响。被测信号(如吸收、散射、发射等)的输出,可以用下式表征: Uout=K·X·I_0+U_0 式中K为光接收器和放大器总的增益。U_0为放大器零点漂移输出值。X为待测信息,它与被测物质的性质,光波长等因素有关。I_0为光源强度值。从上式可以看出,若得到理想的测量结果,必须使用理想的光源(I_0≡C为常数),且使放大器的增益稳定(K≡C为常数),无温漂(U_0≡0)。于是上式可
I. Introduction Many optical instruments, such as spectrophotometer, infrared visible absorption spectrometer, scattering spectrometer, etc., in the measurement process, the light intensity of the measurement results have a great impact. The output of the measured signal (such as absorption, scattering, emission, etc.) can be characterized by: Uout = K · X · I_0 + U_0 where K is the total gain of the optical receiver and amplifier. U_0 is the amplifier zero drift output value. X is the information to be tested, it is related to the nature of the substance to be tested, the wavelength of light and other factors. I_0 is the light intensity value. As can be seen from the above equation, if the ideal measurement results, you must use the ideal light source (I_0≡C constant), and make the amplifier gain stable (K≡C is constant), no temperature drift (U_0≡0). So on the type can be