Singh, Shyam2014-04-142014-04-142013Singh, S. 2013. Self-checking impurity method in liquids. International Science and Technology Journal of Namibia 1(1-2):7-10.2026-7673http://hdl.handle.net/11070/814We propose a very simple technique for the determination of impurity in liquids based on the refractive index. This technique requires two similar gratings, two similar low power lasers emitting same wavelength and a position detector. The change in refractive index of liquid determines the impurity in a liquid.enImpurity in liquidsRefractive indexGratingsArticle