Sonic densitometer

A sonic densitometer consists of a device for measuring the speed of sound in the liquid [4, 8]. The speed of sound c is given by Eq. (27), where E is the bulk modulus and p is the mass density [4]. Unfortunately the liquid must be clear of particles that might scatter the sound waves and limit the received signal. 

Velocity meters with density compensation. The signal from the velocity meter (e.g., turbine meter, electromagnetic meter, or sonic velocity meter) is multiplied by the signal from a densitometer to give a signal proportional to the mass flow rate. 

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See also in sourсe #XX -- [ ]

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