Measurement of humidity

Dyer, Ian

doi:10.1016/j.mpaic.2011.12.011

Cited by 12 publications

(5 citation statements)

References 1 publication

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“…Such, the amount of humidity in clinical samples is influenced by patient conditions, heat-and-moisture-exchanging filters, ventilation settings, active humidification, oxygen concentration, fresh mixture volume, inspiratory and expiratory settings, lung-protective ventilation, etc. [46][47][48][49][50]. EDMON measurements will thus be inaccurate unless corrected for humidity.…”

Section: Open Access Funding Enabled and Organized Bymentioning

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: Open Access Funding Enabled and Organized Bymentioning

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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“…As a significant parameter of atmosphere, humidity has influenced on human life. And achieving a humidity sensitive structure with high accuracy, low cost and a wide range of applications has always been the domestic and international difficult problem [1,2].…”

Section: Introductionmentioning

confidence: 99%

Optimization of dew point sensitive structure based on a quartz resonant sensor

Yang¹,

Meng

Wang

2015

Proceedings of the 4th International Conference on Information Technology and Management Innovation

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Abstract:A new design of dew point sensitive structure based on a quartz resonant humidity sensor is proposed. The resonant frequency of the quartz crystal is considered as a humidity sensitive parameter in Humidity measurement method. Combined with Peltier module, active condensation occurs in the surface of quartz crystal, the variation of its resonant frequency identifies the time of dew point. Optimization of dew point sensitive structure based on a quartz resonant sensor is mainly discussed, the mechanical properties and temperature characteristics of the combination mode consist of the quartz crystal, semiconductor refrigerator and the temperature sensor was analyzed, which was in different medium and with different viscous material. For the optimization of the sensitive structure, the design of the sensitive structure, the software simulation of the sensitive structure and a test experiment system of the sensitive structure mode was considered as the main work.

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“…Humidity measurements are crucial in many fields, such as industrial uses, textiles, agriculture, etc. And the dew point temperature measurement is regarded as the most accurate method for measuring humidity [1,2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

Wang¹,

Meng²,

Yang³

2015

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering

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In this paper, based on the phenomenon that Colpitts oscillation circuit is hard to work when condensation occurs on the surface of the quartz crystal, a new dew point measurement device is developed, and it is mainly composed of a quartz crystal and a Peltier module. This measurement way is both rapid and reversible compared to the traditional methods. Wet sensitive characteristics of the quartz crystal, which is regarded as the humidity sensing element in Colpitts oscillator, is analyzed. The electrical parameters of the quartz crystal are changed due to proactive condensation, then vibration of oscillator will stop if the magnitude of the reactance of the quartz crystal is lower than the reactance threshold of the Colpitts circuit. Combining the theoretical analysis with experiment data, it indicates that the Colpitts circuit is feasible to measure dew point.

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Measurement of humidity

Cited by 12 publications

References 1 publication

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

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

Optimization of dew point sensitive structure based on a quartz resonant sensor

Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

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