Measurement of humidity

Green, Joel D.; Dyer, Ian

doi:10.1016/j.mpaic.2008.11.016

Cited by 20 publications

(4 citation statements)

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“…The sample was acquired with a flow of 150 mL/min. The aim was to simulate sampling inside the lung, choosing 37°C as the reference temperature and ~ 100% relative humidity for gas sampling [ 32 ], as body temperature does not change much during normal clinical conditions [ 33 ] resulting in the maximum concentration of humidity during ventilation, not including active humidification.…”

Section: Methodsmentioning

confidence: 99%

Humidity and measurement of volatile propofol using MCC-IMS (EDMON)

Teucke

Maurer

Müller-Wirtz

et al. 2022

J Clin Monit Comput

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The bedside Exhaled Drug MONitor – EDMON measures exhaled propofol in ppbv every minute based on multi-capillary column – ion mobility spectrometry (MCC-IMS). The MCC pre-separates gas samples, thereby reducing the influence of the high humidity in human breath. However, preliminary analyses identified substantial measurement deviations between dry and humid calibration standards. We therefore performed an analytical validation of the EDMON to evaluate the influence of humidity on measurement performance. A calibration gas generator was used to generate gaseous propofol standards measured by an EDMON device to assess linearity, precision, carry-over, resolution, and the influence of different levels of humidity at 100% and 1.7% (without additional) relative humidity (reference temperature: 37°C). EDMON measurements were roughly half the actual concentration without additional humidity and roughly halved again at 100% relative humidity. Standard concentrations and EDMON values correlated linearly at 100% relative humidity (R²=0.97). The measured values were stable over 100min with a variance ≤ 10% in over 96% of the measurements. Carry-over effects were low with 5% at 100% relative humidity after 5min of equilibration. EDMON measurement resolution at 100% relative humidity was 0.4 and 0.6 ppbv for standard concentrations of 3 ppbv and 41 ppbv. The influence of humidity on measurement performance was best described by a second-order polynomial function (R²≥0.99) with influence reaching a maximum at about 70% relative humidity. We conclude that EDMON measurements are strongly influenced by humidity and should therefore be corrected for sample humidity to obtain accurate estimates of exhaled propofol concentrations.

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Section: Methodsmentioning

confidence: 99%

Humidity and measurement of volatile propofol using MCC-IMS (EDMON)

Teucke

Maurer

Müller-Wirtz

et al. 2022

J Clin Monit Comput

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“…Calibration, Data Analysis and Discussion. The design calibration of the Arduino Atmega 328P-based temperature and humidity measuring instrument was carried out at the BMKG office, Sanglah Region III Geophysics Station, Denpasar (Green & Dyer, 2009;Rittersma, 2002). Figure 3.…”

Section: Methodsmentioning

confidence: 99%

Design of air temperature and humidity measurement based on Arduino ATmega 328P with DHT22 sensor

Wibawa

Putra

2022

ijpse

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The Arduino ATmega 328P-based temperature and humidity measuring instrument have been successfully designed. The ATmega 328P microcontroller functions to process data which is the output of the DHT22 sensor which receives data signals in the form of temperature and humidity. The results detected by the design of this tool are displayed on the LCD keypad shield. The calibration process for the design tool was carried out at the BMKG Sanglah Denpasar. The results of the calibration of the design tool with reference tools at BMKG show a good level of accuracy, namely 97.97% for air temperature and 99.35% for air humidity.

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“…Fredriksson et al [ 20 ] and Björngrim et al [ 21 ] applied conductivity measurement methods to evaluate the moisture content of wooden structures. Similarly, radio frequency techniques [ 22 , 23 , 24 , 25 , 26 ], capacitance measurements [ 27 , 28 , 29 , 30 , 31 , 32 ], fiber optics [ 33 , 34 , 35 ], and X -ray techniques [ 36 , 37 , 38 , 39 , 40 ] were all used to assess the moisture content of wood, and provide new ideas for nondestructive evaluation of wood moisture contents. Recently, Rodriguez–Abad et al [ 41 ] and Reci et al [ 42 ] employed the wave signal, based on the ultrasonic method, and the Ground Penetrating Radar (GPR) method to estimate the moisture content of wood, respectively, and they discovered noticeable changes in measurement data when the wood moisture content changed.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study on Timber Moisture Monitoring Using Piezoceramic Transducer-Enabled Active Sensing

Zhang

Huang

et al. 2018

Sensors

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In recent years, the piezoceramic transducer-enabled active sensing technique has been extensively applied to structural damage detection and health monitoring, in civil engineering. Being abundant and renewable, timber has been widely used as a building material in many countries. However, one of the more challenging applications of timber, in construction, is the potential damage caused by moisture. Increased moisture may cause easier warping of timber components and encourage corrosion of integrated metal members, on top of potentially causing rot and decay. However, despite numerous efforts to inspect and monitor the moisture content of timber, there lacks a method that can provide truly real time, quantitative, and non-invasive measurement of timber moisture. Thus, the research presented in this paper investigated the feasibility of moisture-content monitoring using an active sensing approach, as enabled by a pair of the Lead Zirconate Titanate (PZT) transducers bonded on the surface of a timber specimen. Using a pair of transducers in an active sensing scheme, one patch generated a designed stress wave, while another patch received the signal. While the active sensing was active, the moisture content of the timber specimen was gradually increased from 0% to 60% with 10% increments. The material properties of the timber correspondingly changed under varying timber moisture content, resulting in a measurable differential in stress wave attenuation rates among the different specimens used. The experimental results indicated that the received signal energy and the moisture content of the timber specimens show a parabolic relationship. Finally, the feasibility and reliability of the presented method, for monitoring timber moisture content, are discussed.

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Measurement of humidity

Cited by 20 publications

References 0 publications

Humidity and measurement of volatile propofol using MCC-IMS (EDMON)

Humidity and measurement of volatile propofol using MCC-IMS (EDMON)

Design of air temperature and humidity measurement based on Arduino ATmega 328P with DHT22 sensor

A Feasibility Study on Timber Moisture Monitoring Using Piezoceramic Transducer-Enabled Active Sensing

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