Boxman R L, Shlien D J
Appl Opt. 1978 Sep 1;17(17):2788-93. doi: 10.1364/AO.17.002788.
A method is described to measure the temperature field of axisymmetric laminar thermals, plumes, and starting plume caps in a liquid. The sample liquid is placed in a Mach-Zender interferometer, and an infinite-fringe interferogram is recorded on photographic film. By comparison with a bar pattern interferogram, the fringe shift field was measured to an accuracy of +/-0.02. The Bockasten series approximation of the Abel transformation was applied to the fringe shift field to obtain the radial refractive index variation field, which in turn could be related to the temperature variation field through an empirical relationship. Temperature accuracies in the range of +/-0.05 to +/-0.5 degrees C were obtained. The radial temperature profile of the plume was found to be monotonically decreasing, while the cap had a local maximum offset from the axis.
描述了一种测量液体中轴对称层流热流、羽流和起始羽流帽温度场的方法。将样品液体置于马赫-曾德尔干涉仪中，并在摄影胶片上记录无限条纹干涉图。通过与条形图案干涉图进行比较，测量条纹位移场的精度达到±0.02。将阿贝尔变换的博卡斯滕级数近似应用于条纹位移场，以获得径向折射率变化场，进而通过经验关系将其与温度变化场联系起来。获得了±0.05至±0.5摄氏度范围内的温度精度。发现羽流的径向温度分布单调递减，而帽状物相对于轴线有一个局部最大偏移。
