Real time reflectometer
Abstract
A real time reflectometer with the particular utility of measuring fairly rapid (transient) changes in the specular reflectance of a sample which is continuously exposed to a perturbing environment is described. A fixed radiation source, a fixed detector, a uniformly rotating sample wheel, and a uniformly rotating optical wheel protect against misalignment problems. The reflectometer operates by comparing the measurings of a reflected signal with that of a reference signal made within fractions of a second of one another. Reflectance is measured in the infrared, visible, and vacuum ultraviolet regions.
- Publication:
-
NASA Marshall Space Flight Center Report
- Pub Date:
- August 1977
- Bibcode:
- 1977msfc.rept.....Z
- Keywords:
-
- Real Time Operation;
- Reflectometers;
- Specular Reflection;
- Infrared Spectra;
- Light (Visible Radiation);
- Optical Measurement;
- Optical Properties;
- Patents;
- Perturbation;
- Ultraviolet Spectra;
- Instrumentation and Photography