Dynamic gas flow effects on the ESD of aerospace vehicle surfaces

Hogue, Michael D.; Cox, Rachel E.; Mulligan, Jaysen; Ahmed, Kareem A.; Wilson, Jennifer G.; Calle, Luz Marina

doi:10.1016/j.elstat.2017.12.001

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Solid dielectrics are widely used as support elements in different electrical and electronic systems due to their advantages in insulating and mechanical performance [1,2]. Surface charge accumulation which is an interesting and complex phenomenon on solid insulating materials remains a research hotspot in the fields of electric insulation [3,4], electrostatic safety [5,6] and gas discharge [7,8]. For example, charges accumulated on spacer surface in gas-insulated metal-enclosed transmission lines (GIL) induce flashover and directly decrease the withstand voltage [9].…”

Section: Introductionmentioning

confidence: 99%

Review of surface transient charge measurement on solid insulating materials via the Pockels technique

et al. 2021

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Surface charges accumulated on solid insulating materials in electrical apparatuses and electronic devices could distort the initial electric field and severely damage the insulation performance. Accurate transient surface charge measurement is critical to determine the mechanisms of charge transport and flashover occurrence, and estimate surface insulation strength under high voltage. The measurement technique based on the Pockels electro‐optic effect is considered as the only approach for 2‐D dynamic charge distribution behaviour so far, and it has good capability to avoid original electric field distortion caused by conventional methods featured by metal probes. This paper reviews recent progress of the non‐invasive dynamic surface charge measurement systems on the Pockels technique. We focus especially on typical systems with transmitting and reflecting configurations and the frequently used fast inversion algorithms. It can be inferred that higher spatial‐temporal resolution, higher signal‐to‐noise ratio, and better compatibility for both transparent and opaque materials are the future development trends, which greatly depend on multiple technological breakthroughs at impact‐resistant electro‐optic crystals, advanced high‐speed photography and high‐performance inversion algorithms. In addition, the recent studies on transient behaviour of surface discharge, together with the present limitation and future prospects are discussed. It is expected that more ideas will be inspired in transient surface charge measurement by the Pockels technique and other relevant electro‐optic methods.

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Section: Introductionmentioning

confidence: 99%

Review of surface transient charge measurement on solid insulating materials via the Pockels technique

et al. 2021

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“…Electrostatic protection mainly prevents an initiator footfoot or foot-shell electrostatic discharge that would result in an accidental trigger of the initiator [1]. The main technical methods for electrostatic protection have been increasing the cross-sectional area of the initiators and changing the physical characteristics, such as by forming ignition bridges with doped semiconductor materials [2]- [4]. In many electrostatic…”

Section: Introductionmentioning

confidence: 99%

Design, Processing and Testing of a MEMS Energy Grooming Structure for Initiator Materials

et al. 2019

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A common problem experienced by micro-electro-mechanical system (MEMS) initiators is unintentional triggering in a transient high-pulse environment owing to low ignition energy. Herein, therefore, combining the size effect of the Paschen's law with a modified semi-empirical formula of the secondary electron emission coefficient, a theoretical calculation was carried out to improve the electrostatic grooming structures. It was found that the size effect of the Paschen's law is owing to the distance-dependent process dominance of the Thomson discharge process and the field-induced electron emission process. A microscale breakdown model was, thus, proposed based on field-induced electron emission and the secondary electron emission coefficient. The structural simulations and the optimization of various materials were carried out using the multiphysics field simulation software (i.e., COMSOL), and an electrostatic grooming device was subsequently fabricated. During experimental testing, the transient voltage of an electrostatic grooming device with a 1 µm-wide comb gap could be groomed over 130 V. Furthermore, the model was in good agreement with the experimental results in the range of less than 2 µm and more than 9 µm. In the optimum range of 2-9 µm, the result of the test differed from the model by less than 15%. The model, therefore, possesses excellent adaptability in this scale range and can be used to greatly improve the antistatic characteristics of initiators.INDEX TERMS Antistatic characteristic, energy grooming, field-induced electron emission process, Paschen's Law, secondary electron emission.

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Dynamic gas flow effects on the ESD of aerospace vehicle surfaces

Cited by 2 publications

References 2 publications

Review of surface transient charge measurement on solid insulating materials via the Pockels technique

Review of surface transient charge measurement on solid insulating materials via the Pockels technique

Design, Processing and Testing of a MEMS Energy Grooming Structure for Initiator Materials

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