Abstract
This research put forward an exogenous liquid level measurement method based on continuous sound wave amplitude. The distribution of round piston transducers in the sound field of a metal solid was analyzed by building 15 Multi-Gaussian Beam superposition models; the calculation method for echo sound pressure was worked out according to the reflection and refraction properties of ultrasonic wave. The continuous wave with three amplitudes was used as the driving source of ultrasonic sensor, and two single-crystal sensors with the same diameter were used as the transmitting terminal and receiving terminal of ultrasonic waves to carry out experiments for four groups of containers of different wall thickness and to compare the characteristics of echo energy of driving sources with three amplitudes above and below the liquid levels with different wall thickness. Two groups of sensors of different diameters were used to measure the liquid levels of experimental models, and the measuring errors of the two groups of sensors were analyzed and compared. The experimental result shows that the measuring error of the model is less than 5 mm, so it is applicable to the level measurement of liquids or liquid mixtures in many sectors.
Highlights
Height and volume measurements of material in stocking cans and other containers are usually taken in storage of chemicals, food, and petroleum in the production process to make sure of material supply [1,2].Factors influencing measurement accuracy are to be considered to be the sealing medium of the container, materials of corrosive substance, toxicity, and explosiveness [3,4]
Commercial liquid level measurements include radar, ultrasonic, isotope or radioactive, electronic, thermal, optical meters, and hydraulic meters. They achieve successful application, they have to be set into the container connecting with liquid directly, or in need of sound waves and electromagnetic waves [5,6]
Special applicant conditions in petroleum, chemicals, energy, aerospace and other industries call for specialized measurement and equipment of liquid levels
Summary
Factors influencing measurement accuracy are to be considered to be the sealing medium of the container, materials of corrosive substance, toxicity, and explosiveness [3,4]. In order to meet requirement of various kinds of influencing factors, liquid level sensors are developed. Commercial liquid level measurements include radar, ultrasonic, isotope or radioactive, electronic, thermal, optical meters, and hydraulic meters. They achieve successful application, they have to be set into the container connecting with liquid directly, or in need of sound waves and electromagnetic waves [5,6]. Special applicant conditions in petroleum, chemicals, energy, aerospace and other industries call for specialized measurement and equipment of liquid levels. For the conditions of flammables and explosives, ultra-low temperature, high pressure, and other application characteristics of the Sensors 2018, 18, 2516; doi:10.3390/s18082516 www.mdpi.com/journal/sensors
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