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What principle and type of density meter is used?

First, the density meter is to use what principle

Density meter
The gravity of the object pulls the object toward the ground, but if the object is placed in liquid, a force called buoyancy will produce a force in the opposite direction. The buoyancy force is equal to the gravity of the liquid the object replaces, or the gravity of the drained water.
The densitometer floats or sinks according to changes in the balance of gravity and buoyancy. A well-functioning densitometer can only float, so the force pushing the buoyancy upwards is slightly larger than the force pulling it down.
Because the volume of the densitometer does not change, it has the same volume of boiling water*. However, it becomes heavier because it contains more water. When gravity is greater than buoyancy, the density meter sinks. The weight of the densitometer is less than the weight of the same volume of water, so the densitometer floats again. Densitometer readings are big, small and small. When it is immersed in different liquids, the volume does not change. The iron sand or lead particles at the bottom of the densitometer are used to maintain the balance!

Densitometer readings are larger and smaller because P = ρgh. The deeper the density meter enters the liquid, the greater the pressure, so the densitometer readings are larger and smaller.

Second, the type of density meter

Common densitometers and hydrometers include float densitometers, static pressure densitometers, vibratory densimeters, and radioisotope densitometers.

Float Densitometer Its working principle is that the buoyant force of an object in a fluid is related to the fluid density, and the greater the fluid density, the greater the buoyancy. Static pressure density meter Its working principle is: a certain height of the static pressure of the liquid column and the density of the liquid can be used as the scale value of the specific gravity value. The simplest of these instruments is the visual measurement of a float glass pyrometer, referred to as a glass hydrometer. Membrane box is a commonly used pressure measuring element. The densitometer for directly measuring the static pressure of the sample liquid column is called a capsule static pressure densitometer. Another commonly used is a single-tube blow densitometer. Instead of directly measuring the liquid column pressure, it uses measured air pressure. The blow pipe is inserted into a certain depth below the liquid surface to be measured, and the compressed air continuously escapes from the bottom of the pipe through the blow pipe. At this point, the pressure of air inside the tube is equal to the pressure of the sample liquid column at that height, and the pressure value can be converted into density. Two famous Austrian scientists, Hans. Stabinger and Hans Leopord, discovered the measuring principle of the oscillating tube densitometer: when the object is excited and oscillated, its vibration frequency or amplitude is related to the quality of the object itself.

U type oscillation tube

If a U-shaped glass tube is filled with a volume of a liquid sample, the change in its vibration frequency or amplitude reflects the mass or density and specific gravity of a certain volume of sample liquid. The two scientists later designed the prototype and handed it to Mr. Urich Santner and his company Anton Paar to design the earliest digital liquid density meter in 1967. At present, fully automatic liquid density meters are based on the principle of U-shaped oscillating tubes.

The radioisotope densitometer instrument is provided with a radioisotope radiation source. Its radioactive radiation (such as gamma rays) is received by the radiation detector after passing through a certain thickness of the measured sample. The absorption of radiation by a certain thickness of the sample is related to the density of the sample, and the signal of the radiation detector is related to the absorption, thus reflecting the density of the sample.

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