Design review of an in-situ bidirectional reflectometer

Recently, Surface Optics Corporation has designed and manufactured a field portable bidirectional reflectometer that measures the bidirectional reflectance of samples in place without, the need to take samples into the laboratory. The instrument consists of a measurement head, power supply box, and a PC. The measurement head weighs approximately sixty pounds and it contains the source, detector, stepper motors for varying the incident and reflected angles, and a filter wheel. All of these components are software controlled for measuring the BRDF of samples from 400nm to 1100nm (VIS-NIR configuration) or 3.0 mu m to 12.0 mu m (IR configuration) at incident polar angles of 0 to 60 degrees. The detector can map the BRDF of a sample from 0 to 85 degrees polar angle and 0 to 180 degrees in azimuth. The instrument configuration will be reviewed and measured data presented on a blue krylon paint sample.