11. This filament acted like a " light pipe , " capturing and glowing with light from the twin stars. 12. While most light pipes are produced with a round cross-section, light pipes are not limited to this geometry. 13. This may be partially ameliorated through light diffusion, light pipes or tubes, and through somewhat reflective internal surfaces. 14. In the light pipe the photons travel outside of the microscope's vacuum chamber to a photomultiplier tube for amplification. 15. The functioning of the device could be evaluated using light pipes , other sensing devices, and analysis of trapped weapon debris. 16. Their innovations, including the use of light pipes and volumetric analysis, have been important in the deployment of PET imaging. 17. Some versions have an additional daytime reticle illumination via a passive external light pipe or are LED-illuminated using a battery. 18. Another designed feature for the 1995 / 1996 toys was carried over from Generation 2, transparent " light pipe " eyes. 19. Guides in the form of a hollow tube with a highly reflective inner surface have also been used as light pipes for illumination applications. 20. They said the cost of the light pipes for the two test installations was less than half the cost of the bulbs they replaced.
