Abstract
An acoustic measurement system detects solids within a fluid includes a sample cell 10 for containing the fluid, a first transducer 20 for outputting a first acoustic detection signal at a first frequency, a first acoustic receiver 20 responsive to the first acoustic detection signal, and a second acoustic transducer 20 for outputting an acoustic second mixing signal at a second frequency to mix the solids in the fluid within the sample cell. Controller 40 may vary the “on” time of the second transducer with respect to the measurement of the first acoustic signal. The fluid within the cell may be tested under a wide range of temperatures and pressures. The acoustic measurement system may also be used to measure the bulk modulus of the liquid. The method of the invention allows for the detection of crystallization for a portion of the fluid in the sample cell under widely varying conditions.
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