Calcium Fluoride (CaF2) has long been used in research applications. It is acost-effective solution that performs well in controlled environments wherehumidity, chemical exposure, vibration and high frequency noise can beminimized or eliminated. The transmission rate characteristics of CaF2 areideal for higher temperature applications, short and medium wavethermography and for the visual spectrum where transmission rates are over90%. Long wave transmission rates will vary (typically between 50% and 60%)based on imager sensitivities at different wavelengths.
Industrial-Grade Performance
VPFC crystal infrared windows are primarily suited for research or laboratory applications where the environment is controlled and risk of impact is minimal.
VPFC Features
Transparent crystal allows for visual and UV (Corona Camera) inspections.
Calcium Fluoride does not meet impact requirements of IEEE for medium and high-voltage switchgear where any visual viewing pane in switchgear (Crystal IR windows are used for Visual as well as IR Inspections) above 1kV must undergo a mandatory impact test (IEEE C.37.20.2 section a.3.6)
Compatible with long wave and short wave IR imagers
Ultraviolet transmission compatible with corona cams
Fluoride-based crystals can be used in industrial environments, however, they are best suited for laboratory environments where moisture, humidity, vibration and high-frequency noise can be controlled, and where the imager can be periodically recalibrated to the transmission rate of the optic
Housing made of "switchgear-grade" plastics: insulated to 30kV/mm, non-conductive, and UL94 compliant
Materials
Window housing and cover
UL 94 5VA Nylon ("switchgear-grade plastic"); -40°C (-40°F) to 273°C (523°F)
