| 摘要 |
A method and apparatus for measuring the particle concentration of suspensions, especially suspensions having high particle concentration. Light is directed into the suspension, and light scattered by the particles, preferably back-scattered light, is detected at a first and a second position located at different distances from the position where the light is sent into the suspension. The concentration is then calculated as arctanh (Ef/En), or preferably <IMAGE> where En is the detected light intensity at the first relatively near position and Ef is the light intensity at the second relatively far position. The intensity of the light directed into the suspension is controlled by means of the relation EfxEn=1. The mean value of Ef and En is then compared with 1 in order to determine whether the calculated concentration corresponds to the concentration of the suspension being measured. |
