开式呼吸蛙人专用氧气瓶声散射特性

张培珍, 林芳

Sound Scattering Characteristics of Oxygen Cylinder for Open Breathing Diver

ZHANG Peizhen, LIN Fang

表1 氧气瓶各亮点出现角度与相对参考点程差

Tab.1 Distance between bright spots of oxygen cylinder and reference point

亮点	角度	相对程差
棱角①	0°≤θ≤180°	d₁=- $\sqrt{{(\frac{L'}{2})}^{2} + R^{2}}$ cos(θ-arctan(2R/L'))
棱角②	0°≤θ≤180°	d₂=- $\sqrt{{(\frac{L'}{2})}^{2} + R^{2}}$ cos(θ+arctan(2R/L'))
不连续点③	0°≤θ≤180°	d₃= $\sqrt{{(\frac{L'}{2} - R_{1} - L_{1})}^{2} + R^{2}}$ cos $(θ + a r c t a n [R / (\frac{L'}{2} - R - L_{1})])$
不连续点④	0°≤θ≤180°	d₄= $\sqrt{{(\frac{L'}{2} - R_{1} - L_{1})}^{2} + R^{2}}$ cos $(θ - a r c t a n [R / (\frac{L'}{2} - R - L_{1})])$
球冠⑤	90°≤θ≤180°	d₅=R+(L'/2-L₁-R)cos(π-θ)
阀门⑥	0≤θ≤90°,90°≤θ≤180°	d₆= $(\frac{L'}{2} - L_{1} - R_{1})$ cos θ,d₆= $\frac{L'}{2}$ cos θ
环绕波	临界角φ_l附近	Δd₁