Gas Sensor Array Dynamic Measurement Uncertainty Evaluation and Optimization Algorithm

Zhang, Wenwen; Wang, Lei; Ye, Lihua; Li, Peilong; Hu, Mingxue

doi:10.1109/access.2019.2898881

Cited by 12 publications

(6 citation statements)

References 24 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inaccuracy of outdoor low-cost gas sensors is mainly due to their stability, sensitivity, cross-sensitivities and weather conditions [24], [33]- [38]. Consequently, to overcome these problems, sophisticated calibration methods were developed such as neural networks and machine-learning methods.…”

Section: Related Workmentioning

confidence: 99%

Environment-Adaptive Calibration System for Outdoor Low-Cost Electrochemical Gas Sensors

et al. 2019

View full text Add to dashboard Cite

To date, air pollution has caused over seven million deaths worldwide. Real-time monitoring is an efficient solution to prevent and mitigate air pollution. However, air quality monitoring networks are not currently dense enough to cover a large area because of the cost. With the development of low-cost electrochemical gas sensors, the current air quality monitoring network could be extended to a large area with a relatively high-resolution ratio. Nevertheless, the electrochemical gas sensors are not accurate enough compared to standard sensors if they are not carefully calibrated. Therefore, we proposed an environment-adaptive calibration (EAC) system dedicated to the implementation of a collaborative calibration technique for outdoor low-cost electrochemical gas sensors. The EAC system uses a new practical calibration algorithm operating on the Raptor IoT cloud platform that was developed as part of the H2020 Captor project. The system can identify the linear characteristics of gas sensors according to weather conditions, which is valuable prior knowledge for the calibration and the unique character of the EAC system. The outstanding performance of the EAC system is verified by the evaluation of a long-term measurement campaign, in which various metrics are considered, e.g., the goodness-of-fit, target diagram, and daily residuals. INDEX TERMS Air quality monitoring, environment-adaptive calibration (EAC), IoT cloud platform, low-cost electrochemical gas sensors, non-linear regression.

show abstract

Section: Related Workmentioning

confidence: 99%

Environment-Adaptive Calibration System for Outdoor Low-Cost Electrochemical Gas Sensors

et al. 2019

View full text Add to dashboard Cite

show abstract

“…where V Jn and d J are the entries of matrices V and -1 V -1 D respectively; λ n is the eigenvalue value of B. Substituting (12) into (7) and the effective isobaric specific heat of hydrogen becomes:…”

Section: Decoupled Expression Of Effective Specific Heat Of Hydrogenmentioning

confidence: 99%

Decoupling Multiple Rotational Relaxations of Hydrogen to Detect Gas Mixtures

et al. 2019

View full text Add to dashboard Cite

Decoupling multiple acoustic relaxations in multi-component gas mixtures is an effective method to acquire acoustic relaxation characteristic of gas molecules, which can be used to determine gas composition. However, decoupling multiple rotational relaxations of hydrogen still remains challenge. In this paper, we present the decoupling model of hydrogen and decouple the multiple rotational relaxation into the group of single-relaxation ones. Based on this model, the whole rotational relaxation process of hydrogen can be simplified as a few decoupled single rotational relaxation processes. The decoupled results of the effective specific heat, the absorption spectrum and the acoustic velocity dispersion agree with the experimental data, which validates our decoupling model. Furthermore, the proposed decoupling rotational relaxation model can be combined with the existing decoupling vibration model to detect gas mixture. Applications in the detection of gas mixtures including N 2 , CO 2 , O 2 and H 2 are provided. Compared with existing gas sensing method ignoring rotational relaxation, our detection result of gas mixtures H 2 − O 2 − H 2 O is more convincing since the proposed decoupling model contains significant rotational relaxation of hydrogen. Therefore, the proposed decoupling model not only reveals the mechanism of multiple rotational relaxations of hydrogen, but also provides the new method to detect hydrogen gas mixtures.

show abstract

“…Resolution refers to a ratio between the maximum magnitudes measured to the smallest part that can be determined. At the same time, accuracy is defined as the amount of uncertainty in measurement with respect to an absolute standard, and it can directly influence the qualitative analysis of the sensor [ 6 ]. Whereas the limit of detection (LOD) is the lowest quantity of a substance that can be distinguished by the sensor, wherein the capability of a sensor to identify a particular substance.…”

Section: Introductionmentioning

confidence: 99%

A Review of Actuation and Sensing Mechanisms in MEMS-Based Sensor Devices

et al. 2021

View full text Add to dashboard Cite

Over the last couple of decades, the advancement in Microelectromechanical System (MEMS) devices is highly demanded for integrating the economically miniaturized sensors with fabricating technology. A sensor is a system that detects and responds to multiple physical inputs and converting them into analogue or digital forms. The sensor transforms these variations into a form which can be utilized as a marker to monitor the device variable. MEMS exhibits excellent feasibility in miniaturization sensors due to its small dimension, low power consumption, superior performance, and, batch-fabrication. This article presents the recent developments in standard actuation and sensing mechanisms that can serve MEMS-based devices, which is expected to revolutionize almost many product categories in the current era. The featured principles of actuating, sensing mechanisms and real-life applications have also been discussed. Proper understanding of the actuating and sensing mechanisms for the MEMS-based devices can play a vital role in effective selection for novel and complex application design.

show abstract

Gas Sensor Array Dynamic Measurement Uncertainty Evaluation and Optimization Algorithm

Cited by 12 publications

References 24 publications

Environment-Adaptive Calibration System for Outdoor Low-Cost Electrochemical Gas Sensors

Environment-Adaptive Calibration System for Outdoor Low-Cost Electrochemical Gas Sensors

Decoupling Multiple Rotational Relaxations of Hydrogen to Detect Gas Mixtures

A Review of Actuation and Sensing Mechanisms in MEMS-Based Sensor Devices

Contact Info

Product

Resources

About