
[聲] 超聲波
Ultrasound wave has been widely utilized in various industries for its physical and sonochemistry effects.
超聲波具有多種物理和聲化學效應,應用廣泛。
The effect of ultrasound wave on yield of products was investigated and the structure and compositions of the as-prepared products were characterized by IR and element analysis.
考察超聲波作用對合成産物産率的影響,用紅外光譜及元素分析表征合成産物的結構;
Study on the extraction of Polyphenols Substance(PS)from Kujingcha was carried out by ultrasound wave and the effects of experimental factors on experimental results were discussed.
對超聲波輔助提取苦荊茶中多酚類物質的工藝進行研究,讨論了各實驗因素對實驗結果的影響。
Effects of the slice depth, syrup concentration, osmotic duration, power of ultrasonic wave, time of ultrasound treatment on the osmotic dehydration of carrot were stu***d too.
探讨了胡蘿蔔切片厚度、浸泡液濃度、滲透時間、超聲波的功率和超聲波處理時間等幾種因素對胡蘿蔔糖溶液滲漏脫水的影響。
Ultrasound tomography technique is to determine from scattered ultrasonic wave the internal material properties of object.
超聲層析成像技術是指根據物體周圍的散射波,反演物體内部結構圖像的技術。
|ultrasonic wave;[聲]超聲波
超聲波(Ultrasound Wave)詳解
一、定義與基礎特性
超聲波(Ultrasound)指頻率高于人類聽覺上限(通常為20 kHz)的聲波,屬于機械波的一種,需通過彈性介質(如液體、固體)傳播。其本質是介質粒子在聲壓作用下的周期性振動,能量以縱波形式傳遞。
二、核心物理特性
三、傳播機制
超聲波在介質中傳播時遵循聲學波動方程:
$$
abla p - frac{1}{c} frac{partial p}{partial t} = 0 $$
其中 ( p ) 為聲壓,( c ) 為介質聲速。聲速取決于介質密度 ( rho ) 和壓縮模量 ( K ):
$$ c = sqrt{frac{K}{rho}} $$
不同組織聲速差異(如肌肉約1540 m/s,骨骼 >3000 m/s)是醫學成像對比度的基礎。
四、主要應用領域
權威參考資料
Hobbie RK, Roth BJ. Intermediate Physics for Medicine and Biology. Springer.
超聲波(Ultrasound wave)是指頻率高于人類聽覺範圍(通常超過20千赫茲)的聲波,屬于機械波的一種。以下是其詳細解釋:
聲速公式為: $$ v = f cdot lambda $$ 其中,( v )為波速(介質決定),( f )為頻率,( lambda )為波長。
若需進一步了解具體應用場景或技術原理,可提供更多背景信息以便補充解答。
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