Development of on-line detection device of dyebath absorbance based on dual wavelength spectrophotometry

Considering the turbidity and multicomponent of dye solution,as well as the influence of external factors such as background interference,a set of dye solution absorbance detection device,which is based on dual wavelength spectrophotometry and combines with ARM7 kernel processor,is developed.Without the need of reference solution,the device solves the problem that the single wavelength couldn't measure the multicomponent or interference dyeing liquid absorbance accurately.Measuring experiments of three kinds of dye solution were made,respectively,on the device,and the spectrum intensities of two wavelengths were measured.The absorbance curves of the dye solutions were drawn online,where the differences between the selected two highest absorbance values were calculated.In this manner,the influence of background interference was reduced to full extent.Through experiments,it is found that the device exhibits high accuracy and small error in the determination of dye solution absorbance,so it offers an effective approach for on-line detection of dye liquid concentration.