WLPI - What does WLPI stand for? The Free Dictionary
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The crystal is attached to the end of an optical fiber that transmits white light to it and couples the reflected light back to a WLPI signal-conditioning instrument.
As with the WLPI sensor, the GaAs crystal is attached to the end of an optical fiber.
Both the WLPI and GaAs sensors are ideal for very long-term monitoring because they don't drift.