Owen Robert B, Zozulya Alex A
Owen Research Incorporated, Boulder, Colorado 80302-6746, USA.
Appl Opt. 2002 Oct 1;41(28):5891-5. doi: 10.1364/ao.41.005891.
We compare wave-front measurements using double-exposure digital holography and a Shack-Hartmann sensor. A voltage-driven liquid-crystal wedge modulates the optical wave front and provides a refractive-index gradient typical of interesting transparent materials. Measurement accuracy and reliability are similar for both methods. In our opinion, digital holographic interferometry has several advantages for both laboratory and field environments. When compared with Shack-Hartmann methods, these advantages include hardware simplicity and robustness, relative insensitivity to sample dynamic range, and less computational demanding and more straightforward data evaluation algorithms. We believe that digital holography provides the methodology of choice for field studies of transparent materials such as microgravity protein crystal growth experiments.
我们比较了使用双曝光数字全息术和夏克-哈特曼传感器进行的波前测量。一个电压驱动的液晶楔形物调制光波前，并提供典型的有趣透明材料的折射率梯度。两种方法的测量精度和可靠性相似。在我们看来，数字全息干涉术在实验室和野外环境中都有几个优点。与夏克-哈特曼方法相比，这些优点包括硬件简单且坚固、对样品动态范围相对不敏感、计算要求较低以及数据评估算法更直接。我们认为数字全息术为透明材料的野外研究提供了首选方法，例如微重力蛋白质晶体生长实验。
