Detection of hazardous vapours in a dusty environment – development of a protective module for chemical sensor using a laboratory setup for systematically simulating realistic conditions

Zuck, Asaf; Sharabi, Hagai; Kendler, Shai

doi:10.1080/03067319.2019.1632301

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…At an extremely high dust concentration (0.9 gr/m 3 ) which is typical of desert storms, resulting in zero visibility, the sensor performed flawlessly for more than two hours. The CSR described in [ 12 , 13 ] increased the time between failure by approximately two orders of magnitude compared to unprotected sensors in the same conditions. One may argue that the CSR is not a “maintenance-free” device since the dustbin accumulates dust and has to be cleaned periodically.…”

Section: Specific Challenge—gas Monitoring In a Dusty Environmentmentioning

confidence: 99%

“…The drawbacks of filters led to the development of an alternative sensor protection approach based on cyclone dust separation (CSR). The CSR is designed to be an add-on unit to a chemical warfare agent detector (CWA) [12,13]. Note that this is a highly demanding application since these sensors must respond rapidly and accurately to extremely low concentrations of the highly toxic CWA, having boiling points between 140 and 300 • C. CSRs are common in industrial applications that require particulate matter removal from a large volume of air with low operational (energy and maintenance) costs.…”

Section: Specific Challenge-gas Monitoring In a Dusty Environmentmentioning

confidence: 99%

“…Intense solar radiation, elevated temperatures, humidity, corrosive gasses, and dust may result in the sensor’s continuous deterioration and malfunction. Recently, the effect of high concentrations of dust on chemical detectors has been reported [ 12 , 13 ]. Dust accumulation on the optical module of a handheld flame photometric detector resulted in a decrease in sensitivity and eventually in total failure.…”

Section: Introductionmentioning

confidence: 99%

“…Dust accumulation on the optical module of a handheld flame photometric detector resulted in a decrease in sensitivity and eventually in total failure. The rate of this effect depends both on the dust concentration and the operation time [ 12 , 13 ]. One cannot underestimate aerosols’ influence on the performance of the detector during prolonged operation, even in what may be considered convenient locations.…”

Section: Introductionmentioning

confidence: 99%

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The Challenges of Prolonged Gas Sensing in the Modern Urban Environment

Kendler

Zuck

2020

Sensors

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The increase in the urban population is impacting the environment in several ways, including air pollution due to emissions from automobiles and industry. The reduction of air pollution requires reliable and detailed information regarding air pollution levels. Broad deployment of sensors can provide such information that, in turn, can be used for the establishment of mitigating and regulating acts. However, a prerequisite of such a deployment strategy is using highly durable sensors. The sensors must be able to operate for long periods of time under severe conditions such as high humidity, solar radiation, and dust. In recent years, there has been an ongoing effort to ruggedize sensors for industrial applications with an emphasis on elevated temperature, humidity, and pressure. Some of these developments are adapted for urban air sensing applications. However, protection from dust is based on filters that have not been modified in the last few decades. Such filters clog over time, thus requiring frequent replacement. This editorial presents the need for a consumable-free dust removal device that provides consistent performance without affecting the sensing process. A specific solution for removing dust using a cyclone dust separator is presented. The cyclone dust separator is implemented as an add-on module to protect commercially available sensors.

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Section: Specific Challenge—gas Monitoring In a Dusty Environmentmentioning

confidence: 99%

Section: Specific Challenge-gas Monitoring In a Dusty Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Challenges of Prolonged Gas Sensing in the Modern Urban Environment

Kendler

Zuck

2020

Sensors

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“…Continuous gas detection in the industrial environment has many technological challenges where the sensor is exposed to harsh conditions including solar radiation, temperature variations, humidity, and aerosols that may reduce sensor accuracy [5,[10][11][12]. The presence of particle pollution (aerosol) has a high impact on the sensor performance deterioration especially for prolonged sensing operation, even in locations deemed to be convenient.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Modular Platform for Prolonged Sensing of Toxic Gases in Particle Polluted Environments

2021

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The prolonged sensing of toxic gases in polluted particles and harsh environments is a challenging task that is also in high demand. In this work, the proof of principle of a sensitive, low-cost, and low-maintenance reconfigurable platform for filter-free and continuous ammonia (NH3) sensing in polluted environments is simulated. The platform can be modified for the detection of various toxic gases and includes three main modules: a microfluidic system for in-line continuous dust filtering; a toxic gas adsorption module; and a low-frequency microwave split-ring resonator (SRR). An inertia-based spiral microfluidic system has been designed and optimized through simulation for the in-line filtration of small particles from the intake air. Zeolite Y is selected as the adsorbent in the adsorption module. The adsorption module is a non-metallic thin tube that is filled with zeolite Y powder and precisely fixed at the drilled through-hole into the 3D microwave system. For the sensing module, a low-frequency three-dimensional (3D) split-ring resonator is proposed and optimally designed. A microwave resonator continuously monitors the permittivity of zeolite Y and can detect small permittivity alterations upon the presence of ammonia in the intake air. The microwave resonator is optimized at a frequency range of 2.5–3 GHz toward the detection of ammonia under different ammonia concentrations from 400 to 2800 ppm. The microwave simulation results show a clear contrast of around 4 MHz that shifts at 2.7 GHz for 400 ppm ammonia concentration. The results show the proof of principle of the proposed microfluidic-microwave platform for toxic gas detection.

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