Moisture measurement in masonry walls using a non-invasive reflectometer

Hauschild, T.; Menke, F.

doi:10.1049/el:19981694

Cited by 16 publications

(5 citation statements)

References 2 publications

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“…TDR has been used for monitoring moisture content of roads; however, also in this case, a multitude of probes must be installed [39]. Also, in [40], a TDR-based method for measuring the average moisture content along the thickness of walls (in which the thickness of the layers has to be known).…”

Section: Introductionmentioning

confidence: 99%

Hydration Monitoring and Moisture Control of Cement-Based Samples Through Embedded Wire-Like Sensing Elements

2015

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In this paper, a time-domain reflectrometry (TDR)-based solution for monitoring moisture content in cement-based samples is presented. The proposed system employs a simple flexible bi-wire, which acts as a 'distributed' sensing element (as opposed to traditional, local moisture content sensors). Once embedded, the sensing element (SE) remains permanently inside the cement-based sample and can be used both for monitoring the hydration process of the sample structures (ex-ante monitoring) and, successively, for monitoring possible water infiltration during the service life of the structure (ex-post monitoring). In practical applications, the SE could be employed inside building structures at the time of construction, and it could be used for the aforementioned moisture content monitoring purposes. As a preliminary validation of the practical feasibility of the proposed system, in this work, two cement-based samples (made of mortar and concrete, respectively) were equipped with a SE, and their water content was monitored through TDR measurements, over a 28-day period (thus mimicking the ex-ante monitoring conditions). Furthermore, to verify the potential of the proposed method also for the ex-post monitoring, the air-dried mortar sample was intentionally subjected to wetting conditions and the resulting rising damp was observed through the proposed TDRbased system.

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Section: Introductionmentioning

confidence: 99%

Hydration Monitoring and Moisture Control of Cement-Based Samples Through Embedded Wire-Like Sensing Elements

2015

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“…Existing technologies for remote reading of humidity levels in hidden locations such as inside walls are based on different microwave technologies [22]- [23] For some locations and especially thick multi-layer walls it can however be difficult to accurately read a moisture value. Proposals for in-situ water content sensors have also been made utilizing SAW-based transponders [24].…”

Section: Open and Embedded Tagsmentioning

confidence: 99%

RFID Antennas – Possibilities and Limitations

Sidén¹,

Nilsson²

2010

Radio Frequency Identification Fundamentals and Applications Design Methods and Solutions

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“…In this circuit, which is particularly simple, two monochromatic signals e 1 and e 2 such as e 1 (t) = E 1 e jxt and e 2 (t) = E 2 e j(xt+}) are applied to two couplers (3 dB, 908) which are followed by two sub-systems made of a coupler (3 dB, 908) and two quadratic diode detectors (D 1 , D 2 ). The first sub-system gives two values V 1 and V 2 which lead to a d.c. signal which can be written as S R = E 1 E 2 cos} while the second one, where a phase shift of 908 has been added, gives two values V 3 and V 4 which lead to a d.c. signal S I = E 1 E 2 sin}. So, for a constant value E 1 , these signals S R and S I permit the easy detection of the variations of E 2 and }, which lead to the measurement of the scattering parameters.…”

Section: S-parameters Measurement Systemsmentioning

confidence: 99%

“…In fact, around 2 and 10 GHz the mass production of systems dedicated to telecommunications has lowered the cost of microwave components so that competitive devices in terms of price and reliability might be considered for applications such as moisture content determination. Hence many efforts have been made to conceive and develop devices necessary to carry out measurements outside laboratories [2,3]. The aim of this chapter is to present an original indirect moisture measurement apparatus based on the use of a S-parameters measurement system (SPMS) constructed for practical use.…”

Section: Introductionmentioning

confidence: 99%