Method and device for measuring air density in weight mass measurement

Abstract

The invention provides a method for measuring an air density in weight mass measurement and a method for correcting a mass measurement result, which belong to the measurement field. The method comprises the following steps that: parameters of air surrounding a weight are firstly measured, then the air parameters are used for obtaining an air density, the air parameters include temperature, humidity and pressure and also include a content of carbon dioxide (CO2). By adopting a way that a plurality of temperature collecting points and at least two humidity collecting points are arranged inside a wind cap, the temperature and the humidity gradient parameters above a balance in the wind cap are obtained, so an accurate value of the air temperature and the accurate air humidity can be calculated to further obtain an accurate value of the air density; and the measurement of the CO2 content is further added in the method, and the influence factor of the CO2 is considered in the test result, so the test result is more accurate.

Description

technical field [0001] The invention belongs to the field of measurement, and in particular relates to a method and a measuring device for measuring air density in weight mass measurement. Background technique [0002] In the high-accuracy weight mass measurement test, in addition to obtaining accurate weight mass results, it is also necessary to use the air parameters in the test environment to correct the mass results, mainly considering the air buoyancy factor. The correction coefficient of air buoyancy is mainly through measuring the air temperature, humidity and pressure in the test environment, calculating the air density, and then obtaining the mass correction coefficient of air buoyancy. [0003] In the existing weight measurement tests, thermometers, hygrometers, and aneroid manometers are usually used to measure the corresponding temperature, humidity, and pressure parameters. High-accuracy weight mass measurement tests require a windshield outside the mass compar...

AI Technical Summary

Problems solved by technology

The air parameter measuring instrument is usually placed outside the windshield, or even placed far away from the mass comparator, so that the measured result is not the air parameter value above the mass comparator

Moreover, the existing tests did not take into account the influence of the temperature and humidity gradient changes on the measurement results due to the change of height above the mass comparator in the test environment.

Therefore, the measured air parameter results are not accurate enough, resulting in a large error in the mass correction coefficient

[0004] Additionally, existing trials do not include CO 2 part of the content measurement, while the CO 2 The proportion of components in the air is relatively large, and the influence weight is large, which needs to be measured and reflected in the calculation of air density

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