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8 Cards in this Set

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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
duty factor
PD/PRP
PD: パルス時間
PRP: pulse repetition period
Q factor
F0/ΔF
=周波数/帯域幅
パワーの単位、定義
watt=joule/sec
単位時間当たりの仕事量(エネルギー)
増幅度[dB]
入力Vi→○→出力Vo
20*log(10)Vo/Vi
6dBで2倍
20dBで10倍
周波数と圧電素子の厚さ
反比例
例)0.5mmで2MHz
生体の減衰係数
1[dB/cm*MHz]
強度dB
log(10)I2/I1