FC Adapter for OPM150, P10 and P20

FC fibre adapter to allow fibre input to integrating spheres and free beam optical power meter detector heads.This adapter uses our proprietary design to eliminate back reflections into the detector which would otherwise result in miscalibration of the detector.The external thread is compatible with ...Read more

ORDER CODE: 30.070.00022

FC fibre adapter to allow fibre input to integrating
spheres and free beam optical power meter
detector heads.

This adapter uses our proprietary design to
eliminate back reflections into the detector which
would otherwise result in miscalibration of the
detector.


CHARACTERISTICS

FC-PC and FC-APC



FC fibre adapter to allow fibre input to integrating spheres and free beam optical power meter detector heads.

This adapter uses our proprietary design to eliminate back reflections into the detector which would otherwise result in miscalibration of the detector.

The external thread is compatible with all of our OPM150 free beam detector heads as well as the P10 and P20 integrating spheres.

An integrating sphere is an instrument which collects light through its input port and through multiple diffuse reflections produces a homogeneous optical power density over its inner surface. The power loss of the sphere is through leakage out of the input and exit ports as well as absorption at each internal reflection. At equilibrium, the power loss will equal the power input.

Since the inner surface of the sphere is designed to have low absorption loss (high reflectivity), the power density on the inner surface of the sphere will be higher than the input power density. This ratio is the so-called sphere multiplier "K". Theoretically, this factor is given by
K=ρ/[1-ρ(1-a)], where "ρ" is the reflectivity of the sphere inner surface and "a" is the ratio of the total area of the input and exit ports to the total area of the sphere inner surface. Since "ρ" has a value close to 1, the ratio "a" has a sensitive impact on the K-value.

Consider placing a black anodized plate onto the input port of a 20mm integrating sphere with a 7mm input port. The ratio "a" including exit ports is about 3.5% leading to a K-value of approximately 18. The black plate may reflect up to 30% in the NIR [Marschall, et al; SPIE 2014]. Placing such a plate over the input port is effectively the same as reducing the port area to 70% of the original value: 5.8mm which gives a K-value of approximately 22. This means the integrating sphere will miscalibrated by about 20% when the plate is mounted.

Artifex Engineering has addressed this issue by designing fibre port adapters which reflect so little light back into the integrating sphere that the miscalibration is less than 1% when the adapter plate is mounted.

Detector miscalibration due to back reflections <1%.