scholarly journals Study of Ultrasonic Near-Field Region in Ultrasonic Liquid-Level Monitoring System

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 763
Author(s):  
Wanjia Gao ◽  
Wenyi Liu ◽  
Yanjun Hu ◽  
Jun Wang
Keyword(s):  
Near Field ◽  
Liquid Level ◽  
Minimum Length ◽  
Ultrasonic Probe ◽  
Factors Affecting ◽  
Probe Diameter ◽  
Blind Area ◽  
Near Field Effect ◽  
Level Monitoring ◽  
Buffer Block

In the method of monitoring the liquid level based on ultrasonic impedance, the near-field effect can seriously affect the validity of the results. In this paper, we explore the factors affecting the length of the ultrasonic near field. Based on that, we propose the optimal length and the minimum length of the buffer block to avoid the near field. The evaluations show that when the parameters of the ultrasonic probe are 15 mm in diameter, 1 MHz in frequency, and ±15 V in emitted ultrasonic wave amplitude, the best results are obtained when the length of the buffer block is 22 mm. When the probe diameter is 10 mm, the buffer block length should be ≥5 mm to ensure the validity of the measured results. The evaluation precision is 1 mm. This research can effectively avoid the blind area of emitted waves when using ultrasonic to measure the liquid level. It provides an effective basis for the selection and design of ultrasonic probes.

scholarly journals Analysis and Validation of Ultrasonic Probes in Liquid Level Monitoring Systems

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1320
Author(s):  
Wanjia Gao ◽  
Wenyi Liu ◽  
Fei Li ◽  
Yanjun Hu
Keyword(s):  
Liquid Level ◽  
Wave Excitation ◽  
Experimental Conditions ◽  
Average Deviation ◽  
Ultrasonic Probe ◽  
Reflection And Transmission ◽  
Excitation Signal ◽  
Parameters Selection ◽  
Simulation And Experiment ◽  
Level Monitoring

Selecting and designing the optimum ultrasonic probe is vital for ultrasonic measurements and experiments. The amplitude of the emitted ultrasonic wave excitation signal as well as the diameter and the natural frequency of the probe seriously affect the validity of the probe results. In this paper, we analyze the significance of the key parameters of the ultrasonic probe theoretically. Further, an external fixed-point liquid level monitoring system was assembled according to the principle of ultrasonic reflection and transmission. On this experimental platform, we study the key parameters of the ultrasonic probe that affect the system evaluation through a simulation and experiment, and select the optimal sensor parameters for this experiment. The evaluations show that under the experimental conditions where the tested container is made of aluminum alloy and its wall thickness is 3 mm, the best results are obtained when the diameter of the ultrasonic sensor is 15 mm, the amplitude of the emitted excitation signal is ±15 V, and the frequency is 1 MHz. The results’ average deviation is less than ±0.22 V. The evaluations are consistent with the simulation results. This research can effectively monitor the liquid in the closed, ultra-thin-walled container, and can realize non-contact measurement. It provides an effective basis for the parameters selection and design of the ultrasonic probe in the ultrasonic-based experiments and tests.

Near field effect in nonlinear optics of surfaces

1996 ◽  
Author(s):  
Oleg N. Gadomsky ◽  
I. V. Gadomskaya ◽  
S. V. Emelyanov
Keyword(s):  
Nonlinear Optics ◽  
Field Effect ◽  
Near Field ◽  
Near Field Effect

The near-field effect in a system of two-level dipole particles

2000 ◽  
Vol 67 (3) ◽  
pp. 517-522 ◽  
Author(s):  
O. N. Gadomskii ◽  
Yu. Yu. Voronov
Keyword(s):  
Field Effect ◽  
Near Field ◽  
Near Field Effect

Near field effect on the evaluation of site attenuation

1989 ◽  
Vol 12 (3) ◽  
pp. 331-339 ◽  
Author(s):  
Horng‐Dow Chuang ◽  
Chi‐Fang Huang
Keyword(s):  
Field Effect ◽  
Near Field ◽  
Near Field Effect

Near-field effect in the optics of a surface

1994 ◽  
Vol 61 (1-2) ◽  
pp. 541-545
Author(s):  
O. N. Gadomskii ◽  
S. V. Emel'yanov
Keyword(s):  
Field Effect ◽  
Near Field ◽  
Near Field Effect

scholarly journals THE TESTING SCHEME FOR STEEL CORROSION IN THE REINFORCED CONCRETE VIA NEAR FIELD EFFECT OF METER-BAND WAVE

2017 ◽  
Vol 66 ◽  
pp. 127-134 ◽  
Author(s):  
Ruiqiang Zhao ◽  
Hong Zhang ◽  
Jianting Zhou ◽  
Leng Liao ◽  
Runchuan Xia
Keyword(s):  
Reinforced Concrete ◽  
Field Effect ◽  
Near Field ◽  
Steel Corrosion ◽  
Testing Scheme ◽  
Near Field Effect

Design of a Sensor System Using Fiber Bragg Grating for Liquid Level and Liquid Density Measurement

2020 ◽  
Vol 18 (12) ◽  
pp. 889-893
Author(s):  
Kalyan Biswas
Keyword(s):  
Fiber Bragg Grating ◽  
Density Measurement ◽  
Sensor System ◽  
Liquid Level ◽  
Bragg Grating ◽  
Liquid Density ◽  
Bragg Wavelength ◽  
Sensing System ◽  
System A ◽  
Level Monitoring

In this work, a simple but versatile sensing system for very accurate sensing of liquid level and liquid density is presented. The sensor works based on basic strain sensitivity of Fiber Bragg Grating (FBG) and principle of liquid obeying Archimedes’ law of buoyancy. In this system, a cylindrical shaped mass suspended from a Fiber Bragg Grating and partially immersed in the liquid to be sensed. If the liquid level in the container or liquid density varies, that change the up thrust on the suspended mass and load on the Fiber will be changed accordingly. The change in the load on Fiber changes strain on the FBG and the reflected Bragg wavelength also changes. The proposed device with proper calibration should be able to carry out real time and nonstop liquid level and liquid density measurements. A mathematical analysis of the system considering liquid properties and geometrical structure of the suspended mass is presented here. Sensitivity of the system for liquid level monitoring is also reported. Achieved results shows the path for the utilization of the proposed sensor system for precise liquid density measurement and liquid level sensing in very large storage tanks used for commercial/residential applications.

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