Concentration H&lt;inf&gt;2&lt;/inf&gt; measurement and uncertainty analysis using ultrasonic transducer

Costa, Maxwell Moura; Freire, Raimundo C. S.; Villanueva, Juan Moisés Maurício; Martins, Viviane S. G.

doi:10.1109/i2mtc.2012.6229542

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The principle of ultrasonic gas detection is based on sound velocity measurements. Sound velocity measurement methods can be divided into threshold detection (TH) methods and phase difference (PD) methods [21]. The difference between the two types of methods is that TH methods send an ultrasonic pulse group, while PD methods send a continuous ultrasonic wave, and the gas concentration is indicated by measuring the signal delay between the transmitter and the receiver.…”

Section: Methodsmentioning

confidence: 99%

An Ultra-Low-Power-Consumption Urban Sewer Methane Concentration Monitoring System Based on Ultrasound

et al. 2023

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Methane is the main cause of sewer explosion accidents, and the available monitoring methods mainly use portable gas sensors for on-site detection. However, these methods cannot grasp the dynamic changes in methane in a sewer in real time or make good predictions of methane explosion accidents. Here, we present a low-power online monitoring system for sewer methane in order to ensure the safety of urban sewers. A low-power ultrasonic gas sensor was used to monitor the methane content in biogas. Due to the impacts of changes in CO2, temperature, and humidity in the sewer on the ultrasonic methane measurement results, a corresponding compensation method was proposed. The effectiveness of the compensation method was verified through experiments, which measured the methane concentration under different influences, and the methane values measured before and after compensation were compared. The power consumption was only 1.28 mW when the system worked in intermittent operation mode, and it could operate for about 1.5 years using a lithium battery with a capacity of 5 Ah. The experimental results showed that gas detection accuracy could meet commercial requirements and compensated for the impacts of carbon dioxide, temperature, and humidity.

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Section: Methodsmentioning

confidence: 99%

An Ultra-Low-Power-Consumption Urban Sewer Methane Concentration Monitoring System Based on Ultrasound

et al. 2023

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“…These devices are widely used in industry for continuously monitoring gas leakages [ 26 , 27 , 28 , 29 ] or manufacturing processes [ 30 , 31 , 32 , 33 ]. Gas detectors can be classified according to their operation principles: electrochemical devices [ 34 , 35 , 36 , 37 ], photoionization−based types [ 38 , 39 , 40 , 41 ], ultrasonic detectors [ 42 , 43 , 44 , 45 ], and semiconductor−based devices [ 46 , 47 , 48 , 49 ]. Among the various detector types, semiconductor−based devices allow rapid gas detection because the electrical resistance changes when it comes into contact with the target gas.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Photo−Activated Chemical Sensors

Lee

Yoo

2022

Sensors

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Gas detectors have attracted considerable attention for monitoring harmful gases and air pollution because of industry development and the ongoing interest in human health. On the other hand, conventional high−temperature gas detectors are unsuitable for safely detecting harmful gases at high activation temperatures. Photo−activated gas detectors improve gas sensing performance at room temperature and enable low−power operation. This review presents a timely overview of photo−activated gas detectors that use illuminated light instead of thermal energy. Illuminated light assists in gas detection and is classified as visible or ultraviolet light. The research on photo−activated gas detectors is organized according to the type of gas that can be intensively detected. In addition, a development strategy for advancing photo−activated gas detectors is discussed.

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Development of a multiple-scattering acoustic sensor for process monitoring: Application to monitoring milk coagulation

Sotelo

Pérez

Budelli

et al. 2017

2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Concentration H<inf>2</inf> measurement and uncertainty analysis using ultrasonic transducer

Cited by 3 publications

References 5 publications

An Ultra-Low-Power-Consumption Urban Sewer Methane Concentration Monitoring System Based on Ultrasound

An Ultra-Low-Power-Consumption Urban Sewer Methane Concentration Monitoring System Based on Ultrasound

Recent Advances in Photo−Activated Chemical Sensors

Development of a multiple-scattering acoustic sensor for process monitoring: Application to monitoring milk coagulation

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