Optical Absorption of Pure Water in the Blue and Ultraviolet

这项海洋科学技术开发项目建立在先前开发测量海水光散射和吸收仪器的工作基础上。这些变量对于确定海洋的光学特性是至关重要的，这在进行现场测量和海洋地表水遥感方面具有很大的适用性。吸收是特别有问题的，但新开发的仪器用于这种测量已经获得了可靠的数据，在380 nm至700 nm的光谱范围内，使用各向同性照明的样品在一个积分腔。该项目的目标是：(1)扩展现有仪器的功能，在320 nm至380 nm范围内进行紫外光谱区域的测量；(2)研究超纯水与玻璃和石英接触导致超纯水在蓝色至近紫外范围内吸收增加的明显事实；(3)测量并提高重要UV-C和UV-B光谱区域（特别是240 ~ 320 nm）吸收系数的准确性；(4)建立并测试大型球形积分腔，在最小纯水吸收率下提供更高的吸收率测量精度；(5)研究、构建和测试具有原位装置目标的长管状集成腔。

This ocean science technology development project builds on previous work developing instrumentation to measure light scattering and absorption in ocean water. These variables are critical in determining the optical properties of the oceans, which has great applicability in making in situ measurements and in remote sensing of oceanic surface waters. Absorption is especially problematic, but newly developed instrumentation for such measurements has obtained reliable data in the spectral range of 380 nm to 700 nm. using isotropic illumination of the sample in an integrating cavity. The goals of this project are: (1) to extend the capabilities of this previous instrumentation and make measurements in the ultraviolet spectral region in the 320 nm to 380-nm range; (2) to investigate the apparent fact that contact of ultra-pure water with glass and quartz leads to increased absorption of the ultra-pure water in the blue to near ultraviolet range; (3) to measure and improve the accuracy of the absorption coefficients in the important UV-C and UV-B spectral regions (specifically 240 nm to 320-nm); (4) to build and test a large spherical integrating cavity to provide higher accuracy in the absorption measurements at the minimum of pure water absorption; and (5) to study, build, and test a long tubular form of the integrating cavity with the objective of an in situ device.