CN103344523A - Liquid density real-time measurement method - Google Patents

Abstract

A liquid density real-time measurement method, which can accurately and quickly measure the density of various liquids, and can perform long-distance real-time measurement and transmission. A solid for measuring liquid density; Step 2: One end of the thin wire is tied to the solid, the other end _of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in a liquid with a known density of ρ0 , but not with The container holding the liquid is in contact with each other; Step 3: Amplify the electrical signal output by the force-sensitive sensor through the amplifier, read it from the secondary instrument or directly convert it through A/D, collect and display the data by the computer, adjust the magnification of the amplifier, and make the instrument It is directly displayed as the known density ρ ₀ value; Step 4: Submerge the solid in the liquid to be tested, but not in contact with the container holding the liquid, the meter will directly display the density ρ _x value of the liquid to be tested.

Description

A method for real-time measurement of liquid density

Technical field

The invention relates to a real-time measurement method for liquid density, which is mainly used in experimental teaching in universities and technical secondary schools.

Background technique

Density is a physical parameter of matter. The common liquid density measurement methods include: conventional method, density bottle method, densitometer method, buoyancy method, floating body method, etc. These methods have the disadvantages of low measurement accuracy and complicated measurement, especially Long-distance measurement and transmission cannot be performed.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a liquid density real-time measurement method, which can accurately and quickly measure the density of various liquids, and can perform long-distance real-time measurement and transmission.

，其中v为固体的体积，显然，悬挂物体的细线的张力为：

，因此，液体密度的变化将引起细线中张力的变化；步骤3：将力敏传感器输出的电信号通过放大器放大，由二次仪表读数或直接通过A/D转换，由微机进行数据采集和显示，因此，待测液体密度可通过仪表直接显示，调节放大器放大倍数，使仪表直接显示为已知密度ρ ₀值；步骤4：将固体浸没于待测液体中，但不与盛液体的容器相接触，则仪表直接显示待测液体的密度ρ _x值。 The technical scheme that the present invention adopts to solve its technical problem is, step 1: prepare a solid that volume is ν, insoluble in the liquid to be measured, its density is greater than the density of the liquid to be measured, and mass is m; Step 2: one end of thin line is To hold a solid with a volume of ν and a mass _of m, the other end of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in a liquid with a known density of ρ0 , but not in contact with the container containing the liquid, According to Archimedes' principle, the buoyant force on a solid submerged in a liquid of known density ρ0 is equal to the weight of the same _volume of liquid it displaces, namely:

, where v is the volume of the solid, obviously, the tension of the thin wire hanging the object is:

, therefore, the change of liquid density will cause the change of tension in the thin wire; Step 3: the electrical signal output by the force sensitive sensor is amplified by the amplifier, read by the secondary instrument or directly through A/D conversion, and the data is collected and processed by the microcomputer Display, therefore, _the density of the liquid to be measured can be directly displayed by the meter, adjust the magnification of the amplifier, so that the meter can directly display the known density ρ0 value; Step 4: Immerse the solid in the liquid to be measured, but not with the container containing the liquid If they are in contact with each other, the meter will directly display _the density ρx value of the liquid to be measured.

The beneficial effects of the present invention are: one end of the thin wire is tied to a solid which is insoluble in the liquid to be tested and its density is greater than the density of the liquid to be tested, the other end of the thin wire is fixed on the force sensitive sensor, and the solid is immersed in an already In the liquid with a known density of ρ0 , the electrical signal output by the force sensor is amplified by _the amplifier, and the magnification _of the amplifier is adjusted so that the meter directly displays the value of the known density ρ0 , and then the solid is immersed in the liquid to be tested, but Without contact with the container containing the liquid, the instrument directly displays the density ρx value of the liquid to be measured. The inventive method is simple, convenient, fast, has high measurement accuracy, and can perform long- _distance real-time measurement and transmission.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Embodiment 1 step of the present invention:

a. Prepare a solid that is insoluble in the liquid to be tested and whose density is greater than that of the liquid to be tested;

b. One end of the thin wire is tied to the above-mentioned solid, and the other end of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in water, but not in contact with the water container, and the electrical signal output by the force-sensitive sensor passes through _The amplifier is amplified, adjust the magnification of the amplifier, so that the meter directly displays the value of water density ρ0 ;

c. One end of the thin wire is tied to the above-mentioned solid, the other end of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in the liquid to be tested, but not in contact with the container containing the liquid, the value directly displayed by the meter is is the density ρ _x value of the liquid to be tested.

Embodiment 2 steps of the present invention:

a. Prepare a solid that is insoluble in the liquid to be tested and whose density is greater than that of the liquid to be tested;

b. One end of the thin wire is tied to the above-mentioned solid, and the other end of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in water, but not in contact with the water container, and the electrical signal output by the force-sensitive sensor passes through A/D conversion, data acquisition and display of water _density ρ0 value by microcomputer;

c. One end of the thin wire is tied to the above-mentioned solid, the other end of the thin wire is fixed on the force-sensitive sensor, and the solid is immersed in the liquid to be tested, but not in contact with the container containing the liquid, and the output of the force-sensitive sensor is The electrical signal is converted by A/D, and the data is collected and displayed by the computer to display _the density ρx value of the liquid to be measured.

Claims (1)

1. fluid density method for real-time measurement is characterized in that adopting following technical scheme, step 1: prepare one and be insoluble to testing liquid, its density greater than the solid of testing liquid density; Step 2: an end of fine rule hitches this solid, and the other end of fine rule is fixed on the force-sensing sensor, and with this solid immersion in a known density is ρ ₀Liquid in, but do not contact with the container of holding liquid; Step 3: the electric signal of force-sensing sensor output is amplified by amplifier, by the secondary instrument reading or directly by the A/D conversion, carry out data acquisition and demonstration by microcomputer, the resonance-amplifier enlargement factor makes instrument directly be shown as known density ρ ₀Value; Step 4: solid immersion in testing liquid, but is not contacted with the container of holding liquid, and then instrument directly shows the density of testing liquid ρ _xValue.