Gasoline sensor based on piezoelectric lateral electric field excited resonator

We discuss a strategy capable of a quantitative long‐term monitoring of water saturation and volume variation of light non‐aqueous phase liquids in the soil. The goal was reached monitoring a controlled sand cell contaminated with classical gasoline over 124 days, using geophysical methods such as electrical resistivity tomography, induced polarization and ground penetrating radar. We show that empirical relations, linking the water saturation to the physical parameters measured as resistivity from electrical resistivity tomography and travel time from georadar with advanced processing, are good tools for this purpose. The consistence of the proposed process is validated by both good overlap of results carried out from electrical resistivity tomography and georadar and theoretical models simulating the actual experiment.

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“…; Rocha and Simoes‐Moreira ; Zaitsev et al . ) (Table ). The LNAPL causes 5 cm of water table rise, from 25 to 20 cm (Fig.…”

Section: Experiments Descriptionmentioning

confidence: 99%

“…2). LNAPL is characterized by a very high resistivity and a dielectric constant around 2, according to several authors (Lucius et al 1989;Rocha and Simoes-Moreira 2005;Zaitsev et al 2017) (Table 2). The LNAPL causes 5 cm of water table rise, from 25 to 20 cm (Fig.…”

Section: Cell Set-up and Data Acquisitionmentioning

confidence: 99%

Non‐invasive lab test in the monitoring of vadose zone contaminated by light non‐aqueous phase liquid

Alesse

Orlando

Palladini

2019

Geophysical Prospecting

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“…In industrial production, especially in coal mines, CO 2 is often a product of emissions, which is also a source of danger in the production process (there have been many carbon dioxide outburst accidents in the history of coal mining). Therefore, it is necessary to detect and control the CO 2 emissions in a distributed, real-time and accurate way (Ghosh et al, 2013;Zaitsev et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Improved Sensing Properties of Thermal Conductivity-Type CO2 Gas Sensors by Loading Multi-Walled Carbon Nanotubes Into Nano-Al2O3 Powders

et al. 2021

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Response time is the key index of on-line monitoring system. To improve the response speed of traditional bead thermal conductivity CO2 sensor, this paper proposes to use multi-walled carbon nanotubes (MWCNTs) to improve the performance of gas sensor carrier. Nano-sized γ-Al2O3/CeO2 powder was synthesized by chemical precipitation method under the action of ultrasonic wave. SEM morphology reveals a particle size of 20–50 nm. MWCNTs were hydroxylated and the solution was then prepared by adding a certain amount of dispersant under ultrasonic wave. The composite support of γ- Al2O3/CeO2/MWCNTs was prepared by wet mixing carbon nanotube solution into the above support materials. Using dynamic resistance matching and black component technology, the influence of radiation heat and environmental temperature and humidity is reduced. Results show that the designed thermal conductivity sensor has consistent response and recovery time to different concentrations of CO2, with a T90 response time of 9 s and a T90 recovery time of 13 s, which is faster compared to major commercial Carbon dioxide sensors. The average sensitivity of the sensor is 0.0075 V/10% CO2. Therefore, the high thermal conductivity and pore characteristics of carbon nanotubes can effectively improve the response speed of the thermal conductivity sensor.

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“…These include viscosity measurement using a Love wave [1], particle measurement in oil using a quartz crystal resonator (QCR) sensor [2], refractive index measurement using an optical fiber sensor [3], sensor utilizing the absorption of infrared light [4], complex permittivity measurement using an impedance spectroscopy [5][6][7], an ultrasonic transducer for monitoring the longitudinal wave velocity [8], water in oil [9], and free glycerol in biodiesel [10]. Also, the zero order shear horizontal plate acoustic wave [11] and lateral electric field exited resonator were applied to oil and related materials [12].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study on Shear Horizontal Surface Acoustic Wave Sensors for Engine Oil Evaluation

Kobayashi

Kondoh

2020

Sensors

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On site monitoring of engine oil is required. The features of a shear horizontal surface acoustic wave (SH-SAW) sensor include simultaneous detection of mechanical and electrical properties of liquids (such as viscosity, relative permittivity, and conductivity) and loaded mass on the sensor surface. In this paper, the used engine oil extracted from a motorbike was measured using the SH-SAW sensor. The degradation factors of the used engine oil were experimentally discussed. Especially, the influences of the particles in the engine oil, heating effect, and water contained in the engine oil were considered by comparing the differences between new and used engine oils. The results indicate that the influence of the water contained in the engine oil is the primary cause of the degradation of the used engine oil.

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Gasoline sensor based on piezoelectric lateral electric field excited resonator

Cited by 20 publications

References 11 publications

Non‐invasive lab test in the monitoring of vadose zone contaminated by light non‐aqueous phase liquid

Non‐invasive lab test in the monitoring of vadose zone contaminated by light non‐aqueous phase liquid

Improved Sensing Properties of Thermal Conductivity-Type CO2 Gas Sensors by Loading Multi-Walled Carbon Nanotubes Into Nano-Al2O3 Powders

Feasibility Study on Shear Horizontal Surface Acoustic Wave Sensors for Engine Oil Evaluation

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