Air buoyancy change measuring method and device

Abstract

The invention discloses an air buoyancy change measuring method and device and belongs to the measurement technical field. The method includes the following steps that: the first temperature of a weighing tank and the first mass difference value of the weighing tank with respect to a reference object under a first state are obtained, the second mass difference value of a substitute with respect tothe reference object is obtained, the first gravity difference value of the weighing tank with respect to the substitute is obtained according to the first mass difference value and the second mass difference value; the second temperature of the weighing tank and the third mass difference value of the weighing tank with respect to the reference object under a second state are obtained, the fourthmass difference value of the substitute with respect to the reference object is obtained, and the second gravity difference value of the weighing tank with respect to the substitute is obtained according to the third mass difference value and the fourth mass difference value; and the change value of the air buoyancy of the weighing tank from the first temperature to the second temperature is obtained according to the first gravity difference value and the second gravity difference value. According to the air buoyancy change measuring method, the reference object and the substitute are both objects with stable mass. The change value of the air buoyancy of the weighing tank under different temperatures is measured by means of the substitute with stable mass, and therefore, a result is moreauthentic, direct and reliable.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method and device for measuring air buoyancy changes. Background technique [0002] In the field of measurement technology, weighing tanks are often used to weigh the mass of gases. In practical applications, the gas weighing tank will bring changes in the temperature of the tank body during the process of inflation and deflation, and the temperature change will cause changes in the volume of the weighing tank, thereby bringing about changes in its air buoyancy. When measuring the mass of a weighing tank and the gas in it, the buoyancy of the air directly affects the measurement result. Therefore, when measuring the mass of the weighing tank and the gas in it, it is necessary to make measurement corrections for changes in air buoyancy due to changes in the temperature of the weighing tank. [0003] In the related art, the measurement of the change of air buoyancy is base...

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Problems solved by technology

[0005] The volume of the measuring tank required by the drainage method and the overflow cup method needs to be larger than the measured object, so the cost is high and the operability is low; and since the measured object must be completely submerged in water, if there is a temperature difference between the water and the measured object , will quickly change the temperature of the measured object, which will directly affect the measurement results; in addition, due to the freezing point and boiling point range of water, the temperature range of the measured object must be between 0-100 ° C, beyond the range, it will not be able to measure, and if If the temperature is too high, the water will evaporate quickly and cause errors, so the temperature range will be smaller in actual operation

The sand burial method is the same as the drainage method, but the cost is high and the operability is poor; although the heat conduction speed of sand is slower than that of water, there is still the problem of changing the temperature of the measured object, which affects the measurement results

Calculation rules For irregular objects, the measurement cannot be accurate, and there are large errors in the calculation; and the uneven temperature distribution cannot obtain the real temperature of the measured object, which affects the calculation results; in addition, the measured objects are made of various materials, and the measurement is difficult

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