Abstract
This paper is concerned with a method for measuring masses of the magnetic particles in a fluid such as a magnetic fluid. Two methods are proposed, one of which is the phase difference procedure by use of a laser, and the other is the nuclear magnetic resonance (NMR) procedure. Experimental tests have been carried out to find masses of the magnetic particles in the magnetic fluid with various densities by using the methods mentioned above. It is clarified that the present methods are applicable to measure the masses in a fluid, including a few particles.
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