この研究は、周波数2.45、7.5、10、35、94GHzのマイクロ波が誘発する皮膚の温感閾値を計測した。同じ被験者で、赤外線放射（IR）が誘発する温感閾値も比較のため計測した。計測は、15人男性の背中の真ん中の皮膚で行った。時間的、空間的加重の効果を最小化するため、長いばく露時間（10秒）と広い照射エリア（327 cm2）で測定した。その結果、感受性は試験した周波数の範囲で、周波数とともに単調に上昇した；94GHz（4.5±0.6mW/cm2）での閾値は、2.45GHz（63.1±6.7mW/cm2）のときよりも一桁小さく、IR（5.34±1.07mW/cm2）の閾値と同じであった、と報告している。
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To measure thresholds for microwave-evoked skin sensations of warmth at five different frequencies (2.45, 7.5, 10, 35, and 94 GHz). In the same subjects, thresholds of warmth evoked by infrared radiation were also measured for comparison.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
2.45 GHz
ばく露時間:
intermittent: 10 s exposure in 1 min intervalls
|
|
|
ばく露2:
7.5 GHz
ばく露時間:
intermittent: 10 s exposure in 1 min intervalls
|
|
|
ばく露3:
10 GHz
ばく露時間:
intermittent: 10 s exposure in 1 min intervalls
|
|
|
ばく露4:
35 GHz
ばく露時間:
intermittent: 10 s exposure in 1 min intervalls
|
|
|
ばく露5:
94 GHz
ばく露時間:
intermittent: 10 s exposure in 1 min intervalls
|
additional experiments were done with infrared irradiation of 0 - 30 mW/cm²
| 周波数 | 2.45 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | intermittent: 10 s exposure in 1 min intervalls |
| ばく露の発生源／構造 | |
|---|---|
| Distance between exposed object and exposure source | 0.84 m |
| チャンバの詳細 | 90 cm x 90 cm x 180 cm testing chamber consisting of 5 cm thick polystyrene sheets placed inside an anechoic chamber |
| ばく露装置の詳細 | MW or IR applied through a circular aperture in one wall with a diameter of 20.4 cm; long axis of the test peron parallel to the E-vector of the electromagnetic field |
| Sham exposure | A sham exposure was conducted. |
| 周波数 | 7.5 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | intermittent: 10 s exposure in 1 min intervalls |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 570 mm |
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力 | 300 W | maximum | 校正 | - | - |
| 周波数 | 10 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | intermittent: 10 s exposure in 1 min intervalls |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 720 mm |
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力 | 250 W | maximum | 校正 | - | - |
| 周波数 | 35 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | intermittent: 10 s exposure in 1 min intervalls |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 2 m |
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力 | 70 W | maximum | 校正 | - | - |
| 周波数 | 94 GHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | intermittent: 10 s exposure in 1 min intervalls |
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 2 m |
| Sham exposure | A sham exposure was conducted. |
Sensitivity increased monotonically with frequency throughout the range of microwave frequencies tested. The threshold at 94 GHz (4.5 +/- 0.6 mW/cm²) was more than an order of magnitude less than at 2.45 GHz (63.1 +/- 6.7 mW/cm²), and it was comparable to the threshold for infrared radiation (5.34 +/- 1.07 mW/cm²).
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