Nature inspired capacitive sensor with unique and unclonable characteristic

C. B. Karuthedath, N. Schwesinger

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Background of this paper is the development of sensors showing a nature like characteristic. The sensor is able to detect excitations on inertia bases and operates capacitive. It consists of a miniaturized interdigitated electrode structure on a printed circuit board, a flexible and conductive membrane of PDMS located in a certain distance above and a certain number of steel balls fixed on top of the membrane. The steel ball distribution is random and the conductivity of the membrane is not homogeneous across the membrane. Due to this double random distribution, no sensor equals the other, although the external geometry is equal. The overall size of the sensor is 4.7mm x 4.7mm x 1.7mm. Tilt, acceleration or magnetic fields are capable of causing forces on the steel balls and therefore relative movements between the membrane and the electrode structures. Due to this movement, capacity changes of the arrangement are measurable. This paper describes besides the fabrication of conductive membranes the preparation of regarding sensors. Process technology makes cloning of the sensors impossible. Although all process steps are suited for mass production, no sensor equals the other. Measurements with these sensors prove that each sensor reacts differently to the same excitation. Calculations of the Intra-Concordance-Coefficient show the similarity of the sensors for equal excitations. On the other hand, the maximum Inter-Concordance-Coefficient reveals the differences of such sensors very clearly. Such a characteristic, i.e. equal reaction to equal excitation and an output of significantly different signals allows considering each sensor as a unique device. The sensors obviously behave like receptors in natural organisms. These unusual properties of uniqueness and impossibility to clone make the sensors very interesting for highly secure identification demands. In combination with a very simple measurement procedure, the sensors are an attractive hardware base for technical security solutions.

    Original languageEnglish
    Article number012001
    JournalIOP Conference Series: Materials Science and Engineering
    Volume311
    Issue number1
    DOIs
    Publication statusPublished - 8 Mar 2018
    MoE publication typeA1 Journal article-refereed
    Event2017 International Conference on Sensors, Materials and Manufacturing, ICSMM 2017 - Chiayi, Taiwan, Province of China
    Duration: 24 Nov 201726 Nov 2017

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    Capacitive sensors
    Sensors
    Membranes
    Steel
    Electrodes
    Cloning

    Cite this

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    Nature inspired capacitive sensor with unique and unclonable characteristic. / Karuthedath, C. B.; Schwesinger, N.

    In: IOP Conference Series: Materials Science and Engineering, Vol. 311, No. 1, 012001, 08.03.2018.

    Research output: Contribution to journalArticleScientificpeer-review

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