Tobacco Science & Technology, 2009, 7, p. 5-8, ISSN.1002-0861
Non-destructive detection of strips density variation in case by X-ray attenuation
Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, Henan, China
A method for determining density variation ratio (DVR) of strips in a case was established basing on X-ray attenuation, and the accuracy (correctness and precision) of the method was investigated. The results showed that: 1) the fluctuation of X-ray intensity and strips density indications of the device was less than 1% in 24 hours, which meets the requirements of strips density test; 2) the precision range of strips density (S r, r) determined by X-ray was from 0.012 kg/m3 to 0.301 kg/m3, and its relationship with strips density was 1 n (S r,r) = - 6.31+2.15 l n; 3) the absolute value of relative error was less than 5% when strips density in the case was over 200kg/m3, and it would decrease with the increase of strips density; the precision of DVR (sDVR, r) was 0.0141%-0.0719% and independent of DVR; 4) comparing with the method of sampling from 9 points, the density determined by X-ray device was higher, and the value of DVR was lower and more accurate.