Abstract:

In order study cotton color more accurately and completely, a novel cotton colorimeter based on multi-wave band sensors is presented. The instrument applies Y() sensor and Z() sensor composed of multi-wave band to measure the chromatic parameters of cotton. An algorithm for combination of multi-wave band has been presented specially for cotton color measurement and the structure of the multi-wave band sensors has been designed. Moreover, the instrument applies the 45/0 optical system and microprocessor to control the multi-channel amplifier and ADC to sample the tristimulus value of Y and Z. Finally, the Y and Z measured from the instrument can be used to compute the reflectance ratio (Rd) and yellowness (+b) through Nickerson-Hunter equation. The accuracy of the measurement results reaches ΔRd≤1(%) and Δ(+b)≤0.5 when measuring the standard cotton from USDA.