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8 Cards in this Set
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- Back
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Ispta
上限は？ |
sp: spatial peak
ta: temporal average 音場で最大となる音の強さの時間平均 最大 全て720 眼50 mW/cm^2 |
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duty factor
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PD/PRP
PD: パルス時間 PRP: pulse repetition period |
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Q factor
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F0/ΔF
=周波数/帯域幅 |
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パワーの単位、定義
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watt=joule/sec
単位時間当たりの仕事量(エネルギー) |
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増幅度[dB]
入力Vi→○→出力Vo |
20*log(10)Vo/Vi
6dBで2倍 20dBで10倍 |
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周波数と圧電素子の厚さ
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反比例
例)0.5mmで2MHz |
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生体の減衰係数
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1[dB/cm*MHz]
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強度dB
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log(10)I2/I1
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