Development of Amplifier Circuit by Active-Dummy Method for Atmospheric Corrosion Monitoring in Steel Based on Strain Measurement

Abstract

This paper describes an amplifier circuit fabricated by the active-dummy method for atmospheric corrosion monitoring based on strain measurement. The circuit was used to determine the relationship between the voltage and strain. Experiments involving the thickness reduction of low-carbon steel test pieces induced by galvanostatic electrolysis were carried out with the amplifier circuit. The circuit was capable of accurately measuring signals induced by the thickness reduction of the test piece. Moreover, the circuit was assessed for the effects of environmental temperature drift, and was found to exhibit a high tolerance. The proposed amplifier circuit would be suitable for atmospheric corrosion monitoring in many types of infrastructure.

Atmospheric Corrosion Sensor Based on Strain Measurement with an Active Dummy Circuit Method in Experiment with Corrosion Products

“…The gain of the strain measurement circuit using the gain resistor (R G ) of 4 Ω with the active dummy method was 12,500. The relationship between the voltage and strain in the master curve was measured [31]. Using the R G of 4 Ω, relationship between the strain and voltage was linear, following the equation ∆ε = -11 + 27 ∆V, where ∆V is the output voltage of the strain measurement circuit before it is converted to ∆ε.…”

“…According to [30,31], the strain on the compressive surface of a low-carbon (mild) steel test piece under a bending moment can be expressed by:…”

“…∆ε between ε A and ε D is used to evaluate the thickness reduction from the corrosion. The strain measurement circuit having an active circuit, dummy circuit and differential circuit [31] were fabricated by authors. As strain gauge, FLA-5-11 (Tokyo Sokki, Tokyo, Japan), the ACSSM were used.…”

“…A strain measurement method using strain gauges for in situ corrosion monitoring was proposed in our previous study [30,31]. However, precise monitoring was difficult because the strain measurement method was very sensitive to temperature drift.…”

Performance evaluation of a reticulated shell with atmospheric corrosion damage

“…Atmospheric corrosion can change the physical and chemical properties of the metals as well as weaken the usefulness of construction materials. If the damage accumulation induced by atmospheric corrosion cannot be detected timely, the structural safety will be threatened, and the damage may finally cause partial destruction or even the whole loss of structural function, resulting in huge economic losses and casualty (Chen and Xu, 2007; Cowell and Apsimon, 1996; Purwasih et al, 2018).…”