A fluorescent ion doped glass and a method for using the fluorescent ion doped glass to enhance a fluorescence imaging technique are described herein. One or more signals indicating site conditions at andor near a wind turbine are received 402 and an optimal tilt angle for said wind turbine based on said received one or more signals indicating site conditions is determined 403. The lower contact portion couples with an exterior surface of the cooking container. Also, the first layer of transparent material has an index of refraction smaller than the substrate.