Ultrasonic waves are reflected at boundaries where there is a differen terjemahan - Ultrasonic waves are reflected at boundaries where there is a differen Melayu Bagaimana mengatakan

Ultrasonic waves are reflected at b

Ultrasonic waves are reflected at boundaries where there is a difference in acoustic impedances (Z) of the materials on each side of the boundary. (See preceding page for more information on acoustic impedance.) This difference in Z is commonly referred to as the impedance mismatch. The greater the impedance mismatch, the greater the percentage of energy that will be reflected at the interface or boundary between one medium and another.

The fraction of the incident wave intensity that is reflected can be derived because particle velocity and local particle pressures must be continuous across the boundary. When the acoustic impedances of the materials on both sides of the boundary are known, the fraction of the incident wave intensity that is reflected can be calculated with the equation below. The value produced is known as the reflection coefficient. Multiplying the reflection coefficient by 100 yields the amount of energy reflected as a percentage of the original energy.
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gelombang ultrasonik dicerminkan di sempadan di mana terdapat perbezaan dalam galangan akustik (z) bahan-bahan pada setiap sisi sempadan. (Lihat muka surat sebelum untuk maklumat lanjut mengenai impedans akustik.) Perbezaan ini z biasanya dirujuk sebagai sepadan impedans. yang lebih besar tidak sepadan impedans,lebih besar peratusan tenaga yang akan dapat dilihat pada muka atau sempadan antara satu sederhana dan yang lain.

pecahan keamatan gelombang kejadian yang dapat dilihat boleh diperolehi kerana halaju zarah dan tekanan zarah tempatan mestilah berterusan di seluruh sempadan. apabila galangan akustik bahan-bahan di kedua-dua belah sempadan yang diketahui,pecahan keamatan gelombang kejadian yang dapat dilihat boleh dikira dengan persamaan di bawah. nilai yang dihasilkan dikenali sebagai pekali pantulan. mendarabkan pekali pantulan sebanyak 100 hasil jumlah tenaga yang ditunjukkan sebagai peratusan daripada tenaga yang asal.
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