Image Measurement Of Cotton Length Distribution

The achievement exists in that a new method which can be used to measure the cotton length distribution is offered in this paper. The prototype machine is mainly composed of a CCD and a near-micro optical system which can grab fiber image, recognize every fiber and measure their lengths. At the same time a new Hertel sampling method is invented for the measuring system, and the sampling method is quite helpful in reducing testing time. This new sampling method also means we have solved problem of Hertel sample's measurability , a problem which has frustrated us for more than 60 years. In order to cancel the random effect in cotton sampling, a medieval filtering tool is introduced in our machine. The whole system is controlled by a PC, and one cotton testing result can be obtained in about 10 minutes.Another important work accomplished is comparative experiment with Y111, where the testing items are majority length, short fiber content and quartile length. With the confidence of 95%, the results obtained by image method and Y111 method are highly correlated, where we have R2=0.94 for majority length, R2=0.97 for quartile length and R2=0.8 for short fiber content. We also analyze the results'variances which shows that the two methods have no evident differences in precision when measuring quartile length and short fiber content, whereas the image method is more accurate than Y111 when measuring majority length. Finally we make a comparative experiment on cotton length distribution, and the curves drawn from the data attained by the two methods are pretty similar. All these mean that the image method put up here is valid in measuring cotton length distribution.The original work I have done are as follows1. A new Hertel sampling method has been invented.2. The image measurement of cotton length distribution has been put forward,by which fibers on fibrogram can be accurately measured.3. A math model has been constructed for calculating cotton length distribution from Hertelish curve4.A prototype instrument has been made.