Many fields, such as industry, agriculture, medicine and science, need to measure the volume of an object, and the shape of an object cannot be all regular. At present, the most commonly used method to measure the volume of irregular objects is to use Archimedes principle or three-dimensional laser scanning technology. Using Archimedes principle to measure the volume of an object can measure the volume of an object of any shape, which is easy to operate and low in cost. However, it is necessary to immerse the object in the water, and it cannot be used for many precise and non immersible objects. In addition, for many porous and water absorbing objects, the volume measured by Archimedes principle has a great error.

3D laser scanning has a large amount of data processing, which requires a large memory and a high-speed CPU computer, with a long scanning and data processing time. The surface of the object to be measured is required to be high. If the surface of the object is too dark, too bright or too rough, it will hinder the laser reading and affect the measurement accuracy. And the requirements for the working environment are relatively high, the environment is relatively constant temperature, there is no dust, and the vibration is small. In many industrial locations, these requirements are often not met. In addition, three-dimensional laser scanning can not be used to measure the volume of fragmentary objects, such as certain volume of pharmaceutical powder, industrial powder, wood chips for paper making, sand and gravel on buildings, etc. And people often need to measure the volume of fragmentary objects, so as to know the void ratio when objects are placed together.

The irregular volume measuring instrument creatively uses the change of gas pressure to measure the volume of the object. The measuring principle is protected by the national invention patent (ZL 2009 10180510.0). The volume instrument for measuring the volume of the gas in the measuring chamber when the pressure balance is reached under the same conditions is used to measure the volume difference of the irregular object without adding any measured object and adding the gas volume difference of the measured object. There is no need to submerge the object in water and no need for laser scanning. It is easy to operate, convenient, fast to measure, not limited by the shape of the object, and accurate to measure data. It can be used to accurately measure the volume of fragmentary objects, such as pharmaceutical powder, industrial powder, etc. It can be operated in any environment, such as scientific research, school, industrial place, etc., without environmental restrictions. The conversion and recording process is completely completed by microprocessor automatically, realizing automatic operation.