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:
Model | Cosine correction | Light throughput | Spectral range | Application |
|---|---|---|---|---|
with fiber bundle connector | ||||
EOP-146 | very good | medium | 190 - 2500 nm | for extended light sources |
EOP-120 | medium | good | 190 - 1700 nm | universal |
EOP-121 | medium | good | 190 - 1700 nm | universal, flat format housing |
EOP-140 | low | high | 190 - 2500 nm | low light levels |
EOP-542 | n/a | high | 190 - 2500 nm | 5.7° field-of-view |
with SMA fiber connector | ||||
EOP-350 | very low | good | 1000 - 5000 nm | IR spectral range |
integrating sphere | ||||
ISP40 | excellent | low | 220 - 2500 nm | solar radiation |
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.