A Human Body Pressure Distribution Imaging System Based on Wavelet Analysis and Resistance Tomography

Zhao, Shuanfeng; Wang, Wenbo; Guo, Wei; Zhang, Chuanwei

doi:10.3390/s17112634

Cited by 7 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the measured voltage value, the gray distribution of representative resistivity can be obtained, and the stress field distribution can be obtained. The device can be used as a sensing device for plane stress, such as sensing the stress distribution of human body pressure [ 42 ].…”

Section: Theorymentioning

confidence: 99%

Three Dimensional Distribution of Sensitive Field and Stress Field Inversion of Force Sensitive Materials under Constant Current Excitation

Zhao

Liu

Guo

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

Force sensitive conductive composite materials are functional materials which can be used as the sensitive material of force sensors. However, the existing sensors only use one-dimensional electrical properties of force sensitive conductive materials. Even in tactile sensors, the measurement of contact pressure is achieved by large-scale arrays and the units of a large-scale array are also based on the one-dimensional electrical properties of force sensitive materials. The main contribution of this work is to study the three-dimensional electrical properties and the inversion method of three-dimensional stress field of a force sensitive material (conductive rubber), which pushes the application of force sensitive material from one dimensional to three-dimensional. First, the mathematical model of the conductive rubber current field distribution under a constant force is established by the effective medium theory, and the current field distribution model of conductive rubber with different geometry, conductive rubber content and conductive rubber relaxation parameters is deduced. Secondly, the inversion method of the three-dimensional stress field of conductive rubber is established, which provides a theoretical basis for the design of a new tactile sensor, three-dimensional stress field and space force based on force sensitive materials.

show abstract

Section: Theorymentioning

confidence: 99%

Three Dimensional Distribution of Sensitive Field and Stress Field Inversion of Force Sensitive Materials under Constant Current Excitation

Zhao

Liu

Guo

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…To maximize the effect of the pressure relief through APAMs, a robust and reliable measurement of the body pressure is required simultaneously [1,5,8]. Usually, the main types of sensors to measure the interface pressure are based on the measurement of variations in resistance or capacitance from a deformable sensing component [9,10,11,12,13]. The capacitive pressure sensor measures changes in thickness between layers when pressed.…”

Section: Introductionmentioning

confidence: 99%

“…This sensor has thin and flexible structures, and the sensor needs simple circuitry. However, its output signal is nonlinear with a slow response, and it shows high power consumption [13,14]. Both capacitive and resistive sensors have been reported that they have hysteresis limitation of the measured value drifts over time [14,15].…”

Section: Introductionmentioning

confidence: 99%

Active Body Pressure Relief System with Time-of-Flight Optical Pressure Sensors for Pressure Ulcer Prevention

Lee

Kwon

Lee

et al. 2019

Sensors

View full text Add to dashboard Cite

A body pressure relief system was newly developed with optical pressure sensors for pressure ulcer prevention. Unlike a conventional alternating pressure air mattress (APAM), this system automatically regulates air flow into a body supporting mattress with adaptive inflation (or deflation) duration in response to the pressure level in order to reduce skin stress due to prolonged high pressures. The system continuously quantifies the body pressure distribution using time-of-flight (ToF) optical sensors. The proposed pressure sensor, a ToF optical sensor in the air-filled cell, measures changes in surface height of mattress when pressed under body weight, thereby indirectly indicating the interface pressure. Non-contact measurement of optical sensor usually improves the durability and repeatability of the system. The pressure sensor was successfully identified the 4 different-predefined postures, and quantitatively measured the body pressure distribution of them. Duty cycle of switches in solenoid valves was adjusted to 0–50% for pressure relief, which shows that the interface pressure was lower than 32 mmHg for pressure ulcer prevention.

show abstract

“…However, the seismic wave caused by TRT is relatively weak and easy to be absorbed by unfavorable geological bodies such as fracture zones during the transmission process, which might lead to a short detection length. Of course, it is possible to use empirical mode decomposition (EMD) analysis and wavelet analysis to process TRT wave signals to improve detection accuracy [18,19]. The HSP method is proposed by the China Academy of Railway Sciences.…”

mentioning

confidence: 99%

Coal Mine Inclined Shaft Advanced Detection Method and Physical Model Test Based on Shield Cutterhead Moving Array Electrodes

et al. 2019

Self Cite

View full text Add to dashboard Cite

Using tunnel boring machine (TBM) to construct inclined shafts in coal mines has become the main way for large-scale coal mines to enter deep mining faces. However, some engineering disasters such as water in rush and rock burst will occur when TBM crosses the aquifer and weak broken rock strata. For the sake of efficient tunneling and advanced optimization of the safety plan and supporting measures, it is critically important to detect the anomalous geological conditions in front of the driving face during the service of TBM. Based on the bore-tunneling electrical ahead monitoring (BEAM) system, this paper proposes a coal mine inclined shaft advanced detection method based on shield cutterhead moving array electrodes. First, as the BEAM system cannot image owing to its low utilization rate on spatial distribution information, a diversified excitation and measurement mode with the cutters on the cutterhead as the exciting electrode and measuring electrode is proposed to provide a calculation condition for inversion imaging of the geological condition in front of the driving face. Then, in order to improve the speed of inversion imaging, a virtual grounding electrode equivalent model is proposed to replace the original guard electrode model. Finally, in order to verify the effectiveness of the method, the influence of the virtual grounding electrode on the inversion results at different positions is studied through a physical model test and a numerical inversion test. The results show that the method can better reflect the position of anomalous body.

show abstract

A Human Body Pressure Distribution Imaging System Based on Wavelet Analysis and Resistance Tomography

Cited by 7 publications

References 16 publications

Three Dimensional Distribution of Sensitive Field and Stress Field Inversion of Force Sensitive Materials under Constant Current Excitation

Three Dimensional Distribution of Sensitive Field and Stress Field Inversion of Force Sensitive Materials under Constant Current Excitation

Active Body Pressure Relief System with Time-of-Flight Optical Pressure Sensors for Pressure Ulcer Prevention

Coal Mine Inclined Shaft Advanced Detection Method and Physical Model Test Based on Shield Cutterhead Moving Array Electrodes

Contact Info

Product

Resources

About