Self-Test Procedures for Gas Sensors Embedded in Microreactor Systems

Helwig, Andreas; Hackner, Angelika; Müller, Gerhard; Zappa, Dario; Sberveglieri, Giorgio

doi:10.3390/s18020453

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…In the first case, especially in benchtop devices, the sensor array is first exposed to pure synthetic or filtered air in order to assess the baseline results. Sensor baseline generation under clean air conditions is a vital aspect of e-nose performance, and a new technique of sensor baseline estimation without the need for an external gas supply is also available [23].…”

Section: Generic E-nose Architecture Considering Cfrp Contamination Scenariosmentioning

confidence: 99%

Extended Non-destructive Testing for Surface Quality Assessment

Schlag

Brune

Brüning

et al. 2021

Adhesive Bonding of Aircraft Composite Structures

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This chapter introduces various extended non-destructive testing (ENDT) techniques for surface quality assessment, which are first characterized, then enhanced, and finally applied to assess the level of pre-bond contaminations intentionally applied to carbon fiber reinforced plastic (CFRP) adherends following the procedures described in the previous chapter. Based on two user cases comprising different scenarios that are characteristic of either aeronautical production or repair, the detailed tests conducted on two types of sample geometry, namely flat coupons and scarfed pilot samples with a more complex shape, form the basis for applying the advanced ENDT procedures for the monitoring of realistic and real aircraft parts, as will be described in Chap. 10.1007/978-3-319-92810-4_5. Specifically, the reported investigations were performed to assess the surface quality of first ground and then intentionally contaminated CFRP surfaces using the following ENDT tools: the aerosol wetting test (AWT), optically stimulated electron emission (OSEE), two differently implemented approaches based on electronic noses, laser-induced breakdown spectroscopy (LIBS), Fourier-transform infrared (FTIR) spectroscopy, laser-induced fluorescence (LIF), and laser vibrometry.

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Section: Generic E-nose Architecture Considering Cfrp Contamination Scenariosmentioning

confidence: 99%

Extended Non-destructive Testing for Surface Quality Assessment

Schlag

Brune

Brüning

et al. 2021

Adhesive Bonding of Aircraft Composite Structures

Self Cite

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“…Referring to the sensor-signal testing techniques, existing systems usually focus on the singular measurement of individual physical parameters, such as electrical properties [ 8 , 12 , 13 , 14 ], optical properties [ 15 , 16 , 17 , 18 , 19 ], thermal properties [ 20 ], surface acoustic waves (SAW) [ 21 ], and photoacoustic spectra (PAS) [ 22 ]. On the other hand, fewer systems are capable of the simultaneous measurement of multiple signals [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Vacuum Based Gas Sensing Material Characterization System for Precise and Simultaneous Measurement of Optical and Electrical Responses

Wei

Zhao

Wang

et al. 2022

Sensors

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Gas sensing performance characterization systems are essential for the research and development of gas sensing materials and devices. Although existing systems are almost completely automatically operated, the accuracies of gas concentration control and of pressure control and the ability to simultaneously detect different sensor signals still require improvement. In this study, a high-precision gas sensing material characterization system is developed based on vacuum technology, with the objective of enabling the precise and simultaneous measurement of electrical responses. Because of the implementation of vacuum technology, the gas concentration control accuracy is improved more than 1600 times, whereas the pressure of the test ambient condition can be precisely adjusted between vacuum and 1.2 bar. The vacuum-assisted gas-exchanging mechanism also enables the sensor response time to be determined more accurately. The system is capable of performing sensitivity, selectivity, and stability tests and can control the ambient relative humidity in a precise manner. More importantly, the levels of performance of three different optical signal measurement set-ups were investigated and compared in terms of detection range, linearity, noise, and response time, based on which of their scopes of application were proposed. Finally, single-period and cyclical tests were performed to examine the ability of the system to detect optical and electrical responses simultaneously, both at a single wavelength and in a spectral region.

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Microreaction Technology for Synthetic Chemistry

et al. 2019

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Microreaction technology as an emerging tool for synthetic chemistry has been extensively applied in academic and industrial researches. Normally, synthetic chemists used to running reactions in the classical glassware for centuries are unfamiliar and unaccustomed to use microreaction technology for routine synthetic work. This review tries to give a general introduction of the capabilities of microreaction technology. After introducing the origin and history of microreaction technology, we review and discuss mainly several synthetic examples of high T‐P reactions, hazardous reactions, flash chemistry, polymerization, photochemistry, electrochemistry and multistep API's syntheses to demonstrate the capabilities of microreactors. A summary and perspectives on microreactor technology are also given in this paper. It is anticipated that more and more chemists will understand the capabilities and limitations of microreaction technology, and could work together with chemical engineers for the synergic development of chemistry and chemical engineering.

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Self-Test Procedures for Gas Sensors Embedded in Microreactor Systems

Cited by 5 publications

References 41 publications

Extended Non-destructive Testing for Surface Quality Assessment

Extended Non-destructive Testing for Surface Quality Assessment

Vacuum Based Gas Sensing Material Characterization System for Precise and Simultaneous Measurement of Optical and Electrical Responses

Microreaction Technology for Synthetic Chemistry

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