EOP - Optical probes with diffuser for irradiance measurements

For measuring irradiance and illuminance as well as for general coupling of light into the spectrometer, Instrument Systems provides a range of optical probes. These differ primarily in the cosine correction, the degree of light throughput and the spectral range. All optical probes include a diffuser for the incident light. Behind the diffuser is the entrance facet of the optical fiber used to couple the light into the spectrometer.

Features:

• flexible optical fiber connector
• versions with varying cosine correction and light throughput
• special version with fixed field-of-view of 5.7°

Overview of the available optical probes:

For general applications we recommend the optical probes from the EOP-120 and EOP-121 series (the latter with fiber bundle connector on side), as these offer the best compromise between cosine correction and light throughput. 

A very good cosine correction is necessary for extended light sources, which unfortunately also means low light throughput - as is the case for the EOP-146. Integrating spheres offer an ideal cosine correction together with a broad spectral range. Instrument Systems has developed and offers several versions of the ISP40 to meet this requirement.

The optical probe EOP-140 is only recommended for applications that demand a high light throughput. EOP-542 is available for measurements with a specified field-of-view of 5.7°, generally used for measurement of direct sunlight.