Impedance-Based Moisture Sensor Design and Test for Gas-Phase Biofilter Applications

Yang, Liangcheng; Wang, Xinlei; Funk, T. L.; Gates, Richard S.; Zhang, Yuanhui

doi:10.13031/trans.56.10141

Cited by 2 publications

(6 citation statements)

References 28 publications

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“…The sensor design ( fig. 2) was composed of a conditioning circuit and a sensing unit (Yang et al, 2013a(Yang et al, , 2013b. The circuitry consisted of a voltage-divider circuit and a peak-detector circuit.…”

Section: Sensor Constructionmentioning

confidence: 99%

“…The impedance of the biofilter media can be regarded as a simplified parallel connection of a resistor and capacitor with a single time constant (Kandala et al, 1996;Yang et al, 2013a). Equations 1 through 3 define the impedance sensing principle of the impedance-based moisture sensor:…”

Section: Mathematical and Statistical Model Constructionmentioning

confidence: 99%

“…When the volume percentage of small particles decreased from 50% (1:1 volume ratio) to 20% (1:4 volume ratio), the small particles had fewer chances to contact with the sensor plates, which led to a decrease in the total contact area and resulted in higher impedance, thus the lower sensor reading. Another possible reason may be due to the compaction effect (Yang et al, 2013a). A volume with small particles has more surface area and thus can adsorb more water than larger particles.…”

Section: Sensor Response To Particle Size and Moisture Contentmentioning

confidence: 99%

“…Using impedance allows generalization of the key controlling factors in gas-phase ammonia biofiltration. Recently, an impedance-based moisture sensor was developed that performed better than a capacitive parallel-plate moisture sensor (Yang et al, 2013a(Yang et al, , 2013b. The principle of this sensing method takes advantage of the dielectric characteristic of the biofilter media.…”

mentioning

confidence: 99%

“…This study sought to improve the moisture sensing methods of Yang et al (2013aYang et al ( , 2013b. The objectives were to:…”

mentioning

confidence: 99%

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Impedance-Based Moisture Content Sensor Assessment for Gas-Phase Biofilter Media

Zhao

Yang

Gates

et al. 2017

Transactions of the ASABE

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Abstract. A woodchip-based gas-phase biofilter is capable of mitigating livestock airborne ammonia efficiently with low cost. Control of the moisture content (MC) of biofilter media is critical for ammonia mitigation and limiting nitrous oxide generation. It is important to monitor the real-time biofilter MC to maintain biofilter performance. The objectives of this study were to further develop and evaluate impedance-based MC measurement and to improve methodologies to monitor the MC of gas-phase biofilters. A sensor consisting of a sensing unit (three perforated parallel plates) and a circuit generating DC voltage output was used to measure MC. The sensor readings changed significantly with stepwise MC increases, particle size distribution, and nitrogen (ammonia-nitrogen, nitrate-nitrogen) concentrations in biofilter media. A mathematical model was developed for the relationship between the sensor reading and MC. A statistical model was established to predict the MC in biofilter media based on the sensor reading, ammonia-nitrogen concentration, and nitrate-nitrogen concentration. Keywords: Gas-phase biofilter, Impedance, Moisture sensor, Nitrogen compounds, Particle size distribution.

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Section: Sensor Constructionmentioning

confidence: 99%

Section: Mathematical and Statistical Model Constructionmentioning

confidence: 99%

Section: Sensor Response To Particle Size and Moisture Contentmentioning

confidence: 99%

mentioning

confidence: 99%

“…This study sought to improve the moisture sensing methods of Yang et al (2013aYang et al ( , 2013b. The objectives were to:…”

mentioning

confidence: 99%