EOP Optical Probe

Instrument Systems provides a range of optical probes for measuring irradiance and illuminance, and also for general coupling of light into the spectrometer. These probes differ in the degree o f light throughout, the spectral range and cosine correction. All models of optical probes offered by Instrument Systems include a diffuser for the incident light. The entrance for the optical fiber used to couple the light into the spectrometer is located directly behind this diffuser.


  • flexible optical fiber connector
  • multiple probes with different cosine correction and light throughput
  • special probe with specified field-of-view of 5.7 degrees


ModelCosine correctionLight throughputSpectral rangeApplication
with fiber bundle connector
EOP-146very goodmedium190 – 2500 nmfor extended light sources
EOP-120mediumgood190 – 1700 nmuniversal
EOP-121mediumgood190 – 1700 nmuniversal, flat format housing
EOP-140lowhigh190 – 2500 nmlow light levels
EOP-542n/ahigh190 – 2500 nm5.7° field-of-view
with SMA fiber connector
EOP-350very lowgood1000 – 5000 nmIR spectral range
integrating sphere
ISP40excellentlow220 – 2500 nmsolar radiation

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