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Notice bibliographique
Résumé
Electric field (E-field) sensors were introduced by Stellar Incorporated in 1975 and approved for DOE use by Sandia in 1977. Since then there have been numerous product changes and adaptations to utilize this technology to address a wide range of applications. All such products and product variants rely on the basic concept of measuring changes in capacitance between a "field" wire and a "sense" wire due to the motion of an intruder in the electric field of the wires. In all cases the biggest challenge is to differentiate between changes due to intruders and those due to environmental effects. This has lead to a number of insulator designs to try to minimize the effects of rain, snow, fog, salt spray etc. and various transformer-based balancing schemes to minimize the effects of the environment of the ground plane beneath the array of wires. Recently Senstar-Stellar engineers have embarked upon a complete rework of this technology taking advantage of field programmable gate array (FPGA) devices with high speed sigma delta analog to digital converters to extract more information from the array of wires and thereby optimize the detection process. Several features of this next generation of E-field technology described in this paper include: the ability to discern between capacitive and resistive changes, simultaneous independent measurement of the capacitance between each field and sense wire (for 4 and 8 wire arrays), notch filters to remove 50 and 60 Hz power grid noise, digital signal processing (DSP) to minimize the environmental effects on the ground plane and to differentiate between intruders approaching the sensor and those penetrating between the wires. Along with these electronically generated features the next generation product has a new insulator and support hardware design to further reduce the environmental effects and insect issues. The paper concludes with a discussion of how this technology can be utilized to address the post 9/11 threat at high security sites. While all perimeter security sensors have for years been designed to detect and delay intruders more and more emphasis is now being placed on the delay function. The stacked 8-wire barrier produced by this new design can go as high as 18 feet (5.5 meters) which certainly creates a significant intruder delay if the intruder is to penetrate the sensor undetected.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle