@article{moffitt03a,
  author = {Theodore P. Moffitt and Scott A. Prahl},
  title = {A Dual Sized-Fiber Reflection Probe for Decreased Measurement Variability},
  journal = {Proceedings of the Oregon Academy of Science},
  volume = {39},
  pages = {40},
  year = {2003 abstract only},
  abstract = {We present a new probe design that utilizes two different size diameter fibers with the face polished at a 65~degree angle to make independent diffuse light reflection measurements. The device consists of 200 and 1000~microns diameter fibers that measure the amount of diffuse light scattered back into the emitting fiber. Only one fiber emits and collects light at a time using a 632\,nm He-Ne laser source. Repeated measurements are presented of an epoxy block tissue phantom ($N=12$) and from in vivo skin ($N=13$) on the ventral side of the forearm. The new probe design is demonstrated to reduce measurement variability in the 1000~micron diameter fiber from a standard deviation of 1.5 percent down to 0.6 percent and for the 200 ~micron diameter fiber from a standard deviation of 7.3 percent, down to 1.2 percent, as compared to a prior probe design with fibers polished at 90~degrees. We also present measurements of a first surface mirror, which demonstrate a reduction in specular reflection noise collected by the 65~degree polished fibers. Finally, measurements are presented for an array of Intralipid and India ink tissue phantoms with optical properties in the range of tissues, where scattering ranges $13-28$\,cm$^{-1}$ and absorption ranges $0.1-1.6$\,cm$^{-1}$ at 632\,nm to show the ability to resolve changes in optical properties.},
}