△Bφ=20lgPB/Pφ=20lg(2λX/пX2Bφ2)
△12=20lgPφ1/Pφ2=40lg(φ1X2/φ2X1)
2.5MHzφ14探头(λ=2.36mm,N=20.8mm)
2.5MHzφ20探头(λ=2.36mm,N=42.4mm)
同声程相邻平底孔的增益值
φ0.8 | φ1 | φ2 | φ3 | φ3.2 | φ4 | φ5 | φ6 | φ7 | φ8 |
0dB | 3.8dB | 12dB | 7.0dB | 1.2dB | 3.8dB | 3.8dB | 3.2dB | 2.6dB | 2.4dB |
同声程平底孔φ2基准的增益值
φ0.8 | φ1 | φ2 | φ3 | φ3.2 | φ4 | φ5 | φ6 | φ7 | φ8 |
-15.9dB | -12dB | 0dB | 7.0dB | 8.2dB | 12dB | 15.9dB | 19dB | 21.8dB | 24.0dB |
大平底与φ2平底孔增益值(△Bφ=20lg(0.376X)
0mm | 10mm | 20mm | 30mm | 40 | 50mm | 60mm | 70mm | 80mm | 90mm |
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| 25.5dB | 27.1dB | 28.4dB | 29.6dB | 30.6dB |
100mm | 110mm | 120mm | 130mm | 140mm | 150mm | 160mm | 170mm | 180mm | 190mm |
31.5dB | 32.3dB | 33.1dB | 33.8dB | 34.4dB | 35.0dB | 35.6dB | 36.1dB | 36.6dB | 37.1dB |
200mm | 210mm | 220mm | 230mm | 240mm | 250mm | 260mm | 270mm | 280mm | 290mm |
37.5dB | 37.9dB | 38.3dB | 38.7dB | 39.0dB | 39.5dB | 39.8dB | 40.1dB | 40.4dB | 40.7dB |
300mm | 310mm | 320mm | 330mm | 340mm | 350mm | 360mm | 370mm | 380mm | 390mm |
41.0dB | 41.3dB | 41.6dB | 41.9dB | 42.1dB | 42.4dB | 42.6dB | 42.9dB | 43.1dB | 43.3dB |
400mm | 410mm | 420mm | 430mm | 440mm | 450mm | 460mm | 470mm | 480mm | 490mm |
43.5dB | 43.8dB | 44.0dB | 44.2dB | 44.4dB | 44.6dB | 44.8dB | 45.0dB | 45.1dB | 45.3dB |
500mm | 510mm | 520mm | 530mm | 540mm | 550mm | 560mm | 570mm | 580mm | 590mm |
45.5dB | 45.7dB | 45.8dB | 46.0dB | 46.1dB | 46.3dB | 46.5dB | 46.6dB | 46.8dB | 47.0dB |
600mm | 610mm | 620mm | 630mm | 640mm | 650mm | 660mm | 670mm | 680mm | 690mm |
47.1dB | 47.2dB | 47.3dB | 47.5dB | 47.6dB | 47.8dB | 47.9dB | 48.0dB | 48.1dB | 48.3dB |
700mm | 710mm | 720mm | 730mm | 740mm | 750mm | 760mm | 770mm | 780mm | 790mm |
48.4dB | 48.5dB | 48.6dB | 48.8dB | 48.9dB | 49.0dB | 49.1dB | 49.2dB | 49.3dB | 49.5dB |
800mm | 810mm | 820mm | 830mm | 840mm | 850mm | 860mm | 870mm | 880mm | 890mm |
49.6dB | 49.7dB | 49.8dB | 49.9dB | 50.0dB | 50.1dB | 50.2dB | 50.3dB | 50.4dB | 50.5dB |
900mm | 910mm | 920mm | 930mm | 940mm | 950mm | 960mm | 970mm | 980mm | 990mm |
50.6dB | 50.7dB | 50.8dB | 50.9dB | 51.0dB | 51.1dB | 51.1dB | 51.2dB | 51.3dB | 51.4dB
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