To obtain a true haze measurement, a haze meter (ASTM D1003) is required. However, it is possible to use a spherical geometry Spectrophotometer capable of transmission measurements to obtain an index that correlates well with a haze meter.
To do this, set up the Spectrophotometer (SCI, UVEX, LAV lens and aperture) to perform transmission measurements by measuring the sample on a sphere and calibrate it under these conditions. Typically, this requires a white reflectance standard (Spectralon plaque) and a black trap (open port measurement). Next, the sample is measured on the sphere using a white reflectance standard (Spectralon plaque) followed by a black well (open port).
Some software applications have a haze mode, so once the instrument is set up as described above, the program will prompt the user for each step of the measurement process. These programs will also have haze data options that display the results on the screen.
For more information on haze measurement, please refer to ASTM D1003 standard.
