Absolute Reflectance Accessory

Description

Absolute Reflectance Accessory to measure sample reflectivity

Sample reflectance is usually measured in comparison to a high reflectance diffuse gold or a high reflectance gold mirror. The sample reflectance is measured and calculated against these standards that have 94-99% reflectance in the infrared region.
Absolute reflectance measurement has to be even more accurate than measured by other accessories. Unfortunately, no standards exist today that have guaranteed 100% reflectance, against which unknown samples could be compared. PIKE Technologies have developed a new Absolute Reflectance accessory which does not require reflectance standards due to its unique V / W optical arrangement. The beam in the V position reflects from the reference mirror. In the W position it is reflecting from the sample twice and the same reference mirror. The absolute reflectance of a sample is then the square root of the measured value at a given wavenumber or wavelength. The two configurations are easily selected by rotating the sample holder 180 degrees with its pinned-in-place mount and the sample is held by a quick release mount.

Beam Path for V and W Positions for PIKE Absolute Reflectance Accessory

Spectrum of a Silicon Plate Measured in the PIKE Absolute Reflectance Accessory

• For the measurement of absolute reflectance of optical surfaces, windows and metallic surfaces
• Performance evaluation of optical elements
• Evaluation of test plates in medical, industrial and military applications