Measurement of water vapor content in COIL by absorption spectroscopy at 1 392 nm

The water vapor content in COIL was measured by absorption spectroscopy. Measurement results showed that the change of water vapor content due to the variation of the basic hydrogen peroxide (BHP) temperature could be ignored during normal operation. The water vapor content rose with the increasing of buffer gas flow rate. The gas flow velocity was the main factor that affected the water vapor content in COIL.