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Optical phase contrast measurement of ultrasonic fields

机译：超声场的光学相衬测量

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This report describes an optical phase contrast imaging techniquenfor the measurement of wide bandwidth ultrasound fields in water. Innthis method, a collimated optical wavefront (Λl = 810nnm) impinges on a wide bandwidth ultrasound pulse. The method requiresnthat refractive index perturbations induced by the ultrasound field bensufficiently small. Specifically, on exit from the acoustic field, thenphase of the optical wavefront must be proportional to the ray sum ofnlocal density taken in the direction of propagation of the incidentnoptical wave. A similar restriction is placed on the dimensions of thenultrasound pulse. Repeated measurement of this phase as the ultrasoundnfield is rotated through 180° about an axis normal to the directionnof propagation of the incident optical wave generates the Radonntransform of the ultrasonically induced refractive index perturbation.nStandard tomographic reconstruction techniques are used to reconstructnthe full three-dimensional refractive index perturbation. A simplentwo-lens imaging system and an optical signal processing element fromnphase contrast microscopy provide a method of directly measuring annaffine function of the desired optical phase for small optical phasenshifts. The piezo- and elasto-optic coefficients (the first partialnderivatives of refractive index with respect to density and pressure)nrelate refractive index to density and pressure via a linear model. Thenoptical measurement method described in this paper provides a direct,nquantitative measurement of the piezo- and elasto-optic coefficientsn(from the density or pressure fields)
机译：本报告介绍了一种用于测量水中宽带超声场的光学相衬成像技术。 Innthis方法将准直的光波前（Λ1= 810nnm）入射到宽带超声波脉冲上。该方法要求由超声场引起的折射率摄动足够小。具体来说，在离开声场时，光波前的相位必须与入射正向波的传播方向上取的局部密度的射线总和成比例。对超声波脉冲的尺寸也有类似的限制。当超声场围绕垂直于入射光波传播方向n的轴旋转180°时，重复测量该相位会产生超声诱发的折射率微扰的Radonn变换。n标准的层析成像重建技术用于重建完整的三维屈光指数摄动。单相透镜成像系统和来自相差显微镜的光信号处理元件提供了一种直接测量所需光学相的annaffine函数以实现较小光学相移的方法。压电系数和弹性系数（相对于密度和压力的折射率的第一部分导数）通过线性模型将折射率与密度和压力相关。然后，本文介绍的光学测量方法可以对压电和弹性系数n（从密度场或压力场）进行直接，定量的测量。

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