Research On Measurement Method Of Ultrasonic Propagation Time For Density Measurement Of Crude Oil During Pipeline Transport

Density is the mass per unit volume of a substance, which is one of the basic physical variables describing the characteristic of a substance. Density measurement is an important measurement technique and plays an important role in studying the characteristic of a substance, which is widely used not only in many subjects such as physics, chemistry, metrology and oceanography, but also in petroleum industry, chemical industry, metallurgy industry, light industry, materials industry and so on. It also plays an important role in testing and controlling the process and quality of production.In this paper, an on-line density measurement technique of crude oil during pipeline transport is presented based on ultrasonic technology and liquid density measurement technology, which is applicable to petroleum and chemical industry. According to the measurement principle, a density measurement system for crude oil during pipeline transport is designed. The measurement of ultrasonic propagation time is the key point to the design. The density measurement principle, hardware design of measurement system and software design of MCU system are introduced in this paper. Advanced magnetic seed-metering structure for the installation of ultrasonic sensors is used in order to install the sensors in pipes of different diameters while pipe truncating is not necessary and normal operation of the pipe system will not be affected.The principle that ultrasonic velocity is different in various mediums is the basis for this system. The ultrasonic sensors are installed outside the pipe to emit and receive ultrasonic and ultrasonic propagation time is measured by FPGA. Then ultrasonic velocity is calculated. Oil density is measured through the relationship between liquid density and ultrasonic velocity in the liquid. In this paper, the experiments for ultrasonic emission and reception as well as measurement of ultrasonic propagation time are introduced and the results are analyzed.