Development of novel cotton colorimeter based on multi-wave band sensors

In order to study cotton color more accurately and completely,a novel cotton colorimeter based on multi-wave band sensors is presented.The instrument applies Y(λ) sensor and Z(λ) 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.