Comparison of the Moist Material Relative Permittivity Readouts Using the Non-Invasive Reflectometric Sensors and Microwave Antenna

The paper presents the linear regression model of moisture detection technique in the building material (clinker brick). In particular, the assumptions of linear regression model, which play very important role, are emphasized. The obtained data present the dependence between the moisture of clinker brick, evaluated gravimetrically and permittivity values determined by TDR technique. Using the achieved data, the optimal regression model is obtained and the advantages of applying the linear regression model are discussed.

Section: Introductionmentioning

confidence: 99%

The linear regression model to evaluate material moisture using reflectometric technique

Jastrzębska,

Futa,

Suchorab

2023

“…The apparent permittivity (ε) is a measure of matter particles behaviour in the alternating electric field and that's why for asymmetric water molecules it is higher (εwater = 80) from air (εair = 1) or solid phase (εsolid = 3-8) [6,7]. Apparent permittivity of the moist porous materials can be measured using two techniques of detection: microwave antennas (MW) or time domain reflectometry (TDR) [6,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Application of automatic image analysis to evaluate the anisotropy of autoclaved aerated concrete for moisture transport

Majerek,

Wośko,

Pasnikowska-Łukaszuk

et al. 2023

Autoclaved aerated concrete (AAC) is an artificial building material commonly applied in energy efficient buildings. Blocks of AAC are characterized by relatively homogenous distribution of pores and their dimensions. However, during manufacturing there occurs irregular pores positioning which may influence water transport processes. This phenomenon is called anisotropy which could be evaluated using standard gravimetric or electric methods of moisture detection. In this article we propose a method of level of anisotropy evaluation using image analysis. During the research a set of AAC samples was prepared and examined using time domain reflectometry (TDR) method for capillary uptake phenomenon and in parallel the cross-sections visual analyses were conducted. Both techniques confirmed the anisotropic features of the tested material.

“…Apparent permittivity can be evaluated by microwave measurements using two types of signal analysis methods: time domain (TD) and frequency domain (FD) [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison of microwave moisture evaluation quality in time and frequency domain

Suchorab,

Tabiś,

Szczepaniak

et al. 2023

The article presents the comparison of two methods of microwave data analysis for evaluation of moisture content in porous materials. The content of the paper covers the short description of microwave technique for moisture evaluation and the description of the two methods of microwave data analysis – the time domain and frequency domain. In the second part, the dependences between red brick moisture and apparent permittivity are presented. Apparent permittivity values are determined by microwave antenna and calculated in time and frequency domain. With the calculated values, regression models were estimated and quality of both evaluated. Using the analyzed data, the advantages and disadvantages of both techniques were defined and the measuring potential evaluated.