A combined Q and heterodyne sensor incorporating real-time DSP for reinforcement imaging, corrosion detection and material characterisation

Miller, Graham; Gaydecki, Patrick; Quek, Sung; Fernandes, Bosco; Zaid, Muhammad

doi:10.1016/j.sna.2005.02.023

Cited by 24 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lower frequencies, in the order of 10 to 100 Hz, are often preferred for their greater penetration, where absolute or differential eddy-current probes are often used [ 10 , 11 , 23 ]. However, there are also studies using higher frequency excitation fields, in the range of 1 to 100 kHz, but these are mostly based on the transient behaviour of coil probes [ 12 , 13 , 14 , 17 , 24 , 33 , 34 ]. Although penetration is small at higher frequencies, corrosion is generally a surface effect and therefore detectable [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Magnetic Induction Tomography System and Algorithm for Imaging Metallic Objects

Dingley

Soleimani

2021

Sensors

View full text Add to dashboard Cite

Magnetic induction tomography (MIT) is largely focused on applications in biomedical and industrial process engineering. MIT has a great potential for imaging metallic samples; however, there are fewer developments directed toward the testing and monitoring of metal components. Eddy-current non-destructive testing is well established, showing that corrosion, fatigue and mechanical loading are detectable in metals. Applying the same principles to MIT would provide a useful imaging tool for determining the condition of metal components. A compact MIT instrument is described, including the design aspects and system performance characterisation, assessing dynamic range and signal quality. The image rendering ability is assessed using both external and internal object inclusions. A multi-frequency MIT system has similar capabilities as transient based pulsed eddy current instruments. The forward model for frequency swap multi-frequency is solved, using a computationally efficient numerical modelling with the edge-based finite elements method. The image reconstruction for spectral imaging is done by adaptation of a spectrally correlative base algorithm, providing whole spectrum data for the conductivity or permeability.

show abstract

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Magnetic Induction Tomography System and Algorithm for Imaging Metallic Objects

Dingley

Soleimani

2021

Sensors

View full text Add to dashboard Cite

show abstract

“…In recent years, ultrasonic waves [3,4] are used for early detection and assessment of localized damage in bare rebars in the form of corrosion pits. Electromagnetic induction (AC field) method [5][6][7][8][9], Microwave radar system [10][11][12], thermography technology [13,14], and X-ray method [15] have also been used to evaluate the corrosion of the steel rebar in concrete. For the microwave radar systems, the water or moisture in the concrete structures may have big influence to the detection accuracy.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Evaluation of Steel Rebar Using Electromagnetic Induction Method

He¹

2020

Studies in Applied Electromagnetics and Mechanics

View full text Add to dashboard Cite

Corrosion of steel reinforcing bar (rebar) reduces the strength capacity of concrete, and also causes the crack of concrete due the volume increase of the corrosion products. Detection of corrosion at its early stage is important for the safety evaluation and repairment of the concrete structures. An electromagnetic induction method was developed to evaluate the corrosion of steel rebar. By measuring the electromagnetic response of steel rebar, it was possible to judge the corrosion of steel rebar in concrete. A small compact system, suitable for field experiments was also developed.

show abstract

“…Ultrasonic method [1,2], X-ray method [3,4], magnetic flux leakage (DC field) method [5][6][7], electromagnetic induction (AC field) method [8][9][10][11][12][13], microwave radar system [14][15][16], and thermography technology [17][18] have been used to evaluate the break, the location, or the corrosion of the steel rebar in concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Steel Rebar in Concrete Using Electromagnetic Method

He¹

2019

Failure Analysis

View full text Add to dashboard Cite

The corrosion of steel reinforcing bar (rebar) is the leading cause of deterioration of concrete. In Japan, many railway bridges were built 40 years ago. It is necessary to develop easy-operation method to evaluate the corrosion of steel rebar. A project about the corrosion evaluation of steel rebar was started in 2015. In this project, we have two objectives: one is to evaluate the depth and the diameter of steel rebar in concrete; another is to evaluate the corrosion of steel rebar in concrete. We developed electromagnetic methods to do nondestructive evaluation of the steel reinforcing bar (rebar) in concrete. Using two probes and lower excitation frequencies of 3.8 and 4.2 kHz, the depth and the diameter of the steel reinforcing bar can be evaluated. Using higher excitation frequency of about 80 kHz, and the X, Y signals of the lock-in amplifier, where the X signal is the same phase signal with the AC excitation magnetic field and Y signal is the 90°phase different signal with the AC excitation magnetic field, we could evaluate the corrosion of steel rebar. A compact system with low power consumption of 0.5 W was developed, and we also did some field experiments using this system.

show abstract

A combined Q and heterodyne sensor incorporating real-time DSP for reinforcement imaging, corrosion detection and material characterisation

Cited by 24 publications

References 5 publications

Multi-Frequency Magnetic Induction Tomography System and Algorithm for Imaging Metallic Objects

Multi-Frequency Magnetic Induction Tomography System and Algorithm for Imaging Metallic Objects

Corrosion Evaluation of Steel Rebar Using Electromagnetic Induction Method

Evaluation of Steel Rebar in Concrete Using Electromagnetic Method

Contact Info

Product

Resources

About