Optical sensors for electric substations: a voltage presence detector using a liquid crystal cell

Anagni, F.; Bartoletti, C.; Marchetti, U.; Podestà, L.; Sacerdoti, G.

doi:10.1109/19.293470

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…On the other hand, the mechanical strain is generated due to the inverse piezoelectric effect of BGO under the application of an electric field, where is a compliance coefficient and is a piezoelectric coefficient [18]. By the piezogyration effect, the rotation angle (5) is produced, where is the scalar parameter of gyration, is a piezogyration coefficient, and are components of the unit vector of wave propagation.…”

Section: A Optical Rotation In Bgomentioning

confidence: 99%

Directly High-Voltage Measuring System Based on Pockels Effect

Kumada

Hidaka

2013

IEEE Trans. Power Delivery

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To measure high voltage up to 450 kV in the dc to GHz range, a new optical high-voltage measuring system using a Pockels crystal in a longitudinal modulation arrangement is developed. The maximum measurable voltage for conventional Pockels sensors has been limited by the half-wavelength voltage . In the new system, a two-wavelength dual laser system is introduced to expand measurable voltage up to the least common multiple of for each light. The measured results for dc, ac, lightning impulse, and step voltages by the system are presented and compared with the predicted values.Index Terms-Bismuth germanium oxide (BGO), divider, Faraday effect, Pockels effect, voltage sensor.

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Section: A Optical Rotation In Bgomentioning

confidence: 99%

Directly High-Voltage Measuring System Based on Pockels Effect

Kumada

Hidaka

2013

IEEE Trans. Power Delivery

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“…as underlies the properties of a mammalian cell membrane). A bit more recently, and in parallel and following the development of liquid crystal displays in the 1970s [3], a range of studies have explored the properties of synthetic LCs as the basis of chemical and biological sensors [4][5][6][7][8][9][10][11][12][13][14][15]. In the year 2020, as societal challenges such as management of COVID-19, global changes in climate, and creation of a circular economy have moved to the front-burner, the pull for innovation and translation of sensing technologies is strong: data acquisition and analysis are central elements of decisionmaking common to all of these challenges, and sensors, in many cases, are the source of that data.…”

Section: Introductionmentioning

confidence: 99%

Areas of opportunity related to design of chemical and biological sensors based on liquid crystals

Nayani

Yang

et al. 2020

Liquid Crystals Today

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The societal impact of liquid crystals (LCs) in electrooptical displays arrived after decades of research involving molecular-level design of LCs and their alignment layers, and elucidation of LC electrooptical phenomena at device scales. The anisotropic optical, mechanical and dielectric properties of LCs used in displays also make LCs remarkable amplifiers of their interactions with chemical and biological species, thus opening up the possibility that LCs may play an influential role in a data-driven society that depends on information coming from sensors. In this article, we describe ongoing efforts to design LC systems tailored for chemical and biological sensing, efforts that mirror the challenges and opportunities in LC design and alignment tackled several decades ago during development of LC electrooptical displays. Now, however, traditional design approaches based on structure-property relationships are being supplemented by data-driven methods such as machine learning. Recent studies also show that computational chemistry can greatly increase the rate of discovery of chemically responsive LC systems. Additionally, nonequilibrium states of LCs are being revealed to be useful for design of biological sensors and more complex autonomous systems that integrate self-regulated actuation along with sensing. These topics and others are addressed in this article with the aim of highlighting approaches and goals for future research that will realise the full potential of LC-based sensors.

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“…The above features make FLCs working in the DHF mode very useful for tunable lters, thermography, electrically tunable optical diodes, 23 biosensors, 24 voltage sensors, [25][26][27][28] spatial light modulators, [29][30][31][32] real-time multipoint measurements, under water sonar array systems [33][34][35] such as ber optic hydrophone array systems that could be used for underwater acoustic surveillance applications (e.g. military, counter terrorist and customs authorities for protecting ports and harbours) and many other various applications.…”

Section: Introductionmentioning

confidence: 99%