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電磁式EASシステム

分類:
電子的物品監視装置
説明:

電磁式物品監視（EAS）システムは、一般的に数10Hzから約20kHzまでの周波数範囲を用いる。全てのEASシステムと同様に、商品にタグをつけ、そのタグを店舗出口エリアに置かれた検出器で検出する（電子的物品監視のカテゴリー参照）。パッシブトランスポンダ（タグ）の中には軟磁性金属ストライプが入っており、店舗出口エリアでの複数周波数の外部電磁界でそのストライプは磁化される。複数周波数での磁化により、そのタグは、外部電磁界とは異なる周波数の磁界を放射する。出口エリアの検出器はこの周波数を検出し､警報を鳴らす。不活化では、強い磁界でタグを永久磁化する。そうするともはや検出機構が働くなり、商品は店舗の出口エリアを通過できる。

周波数範囲:
  • 10 Hz–20 kHz
電磁界の種別:
電界および磁界

測定値（文献に拠る）

deactivator
測定されている物理量 測定値 分類上の特徴 特記事項
電界強度 1.24 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the brain; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電界強度 3.88 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the heart; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電界強度 3.93 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the heart; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電界強度 4.47 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the prostata; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電界強度 12.04 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the intestine; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電界強度 13.55 mV/m (最大値, シミュレーション値) 200 Hz - [1]
電界強度 35.31 mV/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the intestine; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電界強度 35.98 V/m (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the prostata; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電流密度 0.1 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the brain; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電流密度 0.3 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the brain; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電流密度 1.89 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the prostata; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電流密度 1.94 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the heart; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電流密度 6.3 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the intestine; male model (height: 176.4 cm) in front of a 85 cm high table; C-shaped core [1]
電流密度 6.78 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the heart; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電流密度 15.18 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the prostata; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
電流密度 18.47 mA/m² (最大値, シミュレーション値) 200 Hz averaged over 1 cm² in the intestine; male model (height: 176.4 cm) in front of a 85 cm high table; bar-type device [1]
磁束密度 0.43–1.6 µT (測定値) 5 - 7.5 kHz at a height of 0.5 - 1.7 m at the cashier's seat in a supermarket [2]
磁束密度 0.6–0.96 µT (測定値) 5 - 7.5 kHz at a height of 0.5 - 1.7 m at the cashier's seat in a small market [2]
磁束密度 2–3 µT (測定値) 5 - 7.5 kHz at a height of 0.5 - 1.7 m at the cashier's seat in a exhibition hall [2]
磁束密度 3 µT (測定値) 5 - 7.5 kHz at a height of 0.5 - 1.7 m at the cashier's seat in a library [2]
detector
測定されている物理量 測定値 分類上の特徴 特記事項
磁界強度 20–47 A/m (平均値, 測定値) 5 and 7.5 kHz mean value of 45 measurement points at two different systems: distance: 20 cm [3]
磁界強度 26 A/m (平均値, 測定値) 6.25 kHz mean value of 45 measurement points at one system; distance: 20 cm [3]
磁界強度 55–98 A/m (平均値, 測定値) 10 Hz mean value out of 45 measurement points of three different systems; distance: 20 cm [3]
磁界強度 138–228 A/m (平均値, 測定値) 220 Hz mean value out of 45 measurement points at two different systems; distance: 20 cm [3]
磁界強度 20 A/m (最大値, 測定値) 6.3 kHz measured at and between the antennas of EAS systems [6]
磁界強度 115.4–218.1 A/m (測定値) 218 - 530 Hz at a distance of approx. 20 cm and a height of 1.3 m [7]
磁界強度 181.8–587.4 A/m (測定値) 218 - 530 Hz at a distance of approx. 20 cm and a height of 1 m [7]
磁束密度 7–33 µT (測定値) 5 - 7.5 kHz at a distance of 0.2 m from the gates in a supermarket [2]
磁束密度 7–38 µT (測定値) 5 - 7.5 kHz in the middle of the gates at a height of 0.8 - 1.7 m in a supermarket [2]
磁束密度 10–28 µT (測定値) 5 - 7.5 kHz in the middle of the gates at a height of 0.8 - 1.7 m in an exhibition hall [2]
磁束密度 13–21 µT (測定値) 5 - 7.5 kHz in the middle of the gates at a height of 0.8 - 1.7 m in a library [2]
磁束密度 14–79 µT (測定値) 5 - 7.5 kHz at a distance of 0.2 m from the gates in an exhibition hall [2]
磁束密度 16–30 µT (測定値) 5 - 7.5 kHz at a distance of 0.2 m from the gates in a library [2]
磁束密度 34–46 µT (測定値) 5 - 7.5 kHz in the middle of the gates at a height of 0.8 - 1.7 m in a small market [2]
磁束密度 38 µT–58 T (測定値) 5 - 7.5 kHz at a distance of 0.2 m to the gates in a small market [2]
磁束密度 39 µT (測定値) 6.25 kHz at a distance of 45 cm to the detector (sinusoidal continuous wave) [4]
磁束密度 43 µT (測定値) 5 and 7.5 kHz at a distance of 48.5 cm to the detector (continuous wave) [4]
磁束密度 58 µT (測定値) 6.25 kHz at a distance of 25.7 cm to the detector (continuous wave) [4]
磁束密度 72 µT (平均値, 測定値) 536 Hz measured in 36 cm distance between two antennas in a width of 73.1 cm. [5]
磁束密度 72 µT (測定値) 535.7 Hz at a distance of 36 cm to the detector (sinusoidal continuous wave) [4]
磁束密度 93 µT (測定値) 230 Hz at a distance of 42 cm to the detector (sinusoidal continuous wave) [4]
磁束密度 100 µT (測定値) 1 kHz at a distance of 41 cm to the detector (pulsed modulated sinusoid) [4]
磁束密度 122 µT (平均値, 測定値) 219 Hz measured in 36 cm distance between two antennas in a width of 81.3 cm. [5]
磁束密度 122 µT (測定値) 219 Hz at a distance of 36 cm to the detector (sinusoidal continuous wave) [4]
磁束密度 146 µT (測定値) 73 Hz at a distance of 31.5 cm to the detector (sinusoidal continuous wave) [4]
磁束密度 1.2 mT (最大値) 218 Hz measured at and between the antennas of EAS systems [6]

参考文献

  1. Li Q et al. (2005): [強磁性コアを用いるEASカウンター作動/作動解除装置からのヒトに対する磁界誘導性電流密度の計算]
  2. Roivainen P et al. (2014): [電子商品監視装置の近くで働く店員の中間周波および超低周波磁界への職業的ばく露]
  3. Trulsson J et al. (2007): [スウェーデンにおける電子式物品監視装置周辺の磁界評価]
  4. World Health Organization (WHO) (2007): [超低周波電磁界（WHO環境保健クライテリアモノグラフNo. 238）]
  5. Casamento J (1999): [一般的電子物品監視システム電磁界の特性記述]
  6. Börner F (2011): [発電所、機械および設備での電磁界]
  7. Harris C et al. (2000): [電子監視システム(EAS)周囲の電磁界強度レベル]