The integrating spheres have 5 ports: input port with 1.5 inch series male flange, 1.0 Inch sample port, in-line with input port, detector port with 1.5 inch series male flange, 1.0 inch specular exclusion/inclusion port (for light trap or plug)

Reflectance and transmittance spheres are 8 inch interior diameter integrating sphere. The integrating spheres have 5 ports: input port with 1.5 inch series male flange, 1.0 Inch sample port, in-line with input port, detector port with 1.5 inch series male flange, 1.0 inch specular exclusion/inclusion port (for light trap or plug). Additional 2.0 inch port at North Pole for center mounted samples or comparison measurement technique. The 70679 and 70682 are for diffuse hemispherical reflectance and total transmittance and measurement of specular using a 8/D geometry (8 degree beam incidence/Diffuse collection). The 70679 is good for the VIS-NIR regions and the 70682 is good for UV-VIR-NIR (Note the ID of the 70682 is ~7.0”).

The spring loading allows you to quickly insert and remove the sample and the 70496 White Spectral Calibration Disk. Light, which is reflected from the sample strikes the port and is turned 8 degrees to the specular exclusion port. A reflectance sample holder with 0.5 inch (13 mm) deep cell, 1 inch (25 mm) diameter holds the sample at 8° to the beam. The holder is spring loaded so that rectangular irregular shapes or square with dimensions up to 2 inches (51 mm) can be held against the sphere wall. The clear aperture is 0.7 inch (18 mm). If a light trap is used in the exclusion port, the specular portion of the sample’s reflectance is subtracted from the measurement. The sample must fill the aperture. If a plug is at the exclusion port, the light is re-captured in the sphere. One extra port plug is included for the north pole port and one exclusion port plug is included with the integrating sphere.

Conversely, if a light trap is used at this port opposite the sample, then the normal transmitted beam is excluded by the trap (normal or diffuse excluded transmittance – allows “haze” characterizations). If a plug is used at the 1.0 inch port opposite the sample (former input port), then all energy is included in the measurement (total transmittance). If the 0° Sample Holder (also included with the 70682 R/T and70679 Spheres) is used at the input beam and the sample port is placed behind the sample port, then you can qualify diffuse, normal or total transmittance of samples.