| 摘要 |
A sensor for monitoring carbon dioxide in a fluid regardless of the phase properties of the fluid, i.e. regardless of whether the fluid contacting the window is a liquid water based phase, a liquid oil-based phase, a mixture of liquid water and liquid oil-based phases, or a gas phase. The sensor includes an internal reflection window 4 for contacting with the fluid. A mid-infrared light source 1 directs a beam of mid-infrared radiation into the window and the beam is internally reflected at an interface between the window and the fluid. The reflected beam is passed through three narrow bandpass filters 5 which preferentially transmit mid-infrared radiation over bands of wavelengths corresponding to absorbance peaks of water, oil and CO2. The amount of CO2 is determined from the intensities of the mid-infrared radiation passing through the three filters. In another aspect a method of determining CO2Â is provided wherein the amount of CO2 is determined by calculating the phase of the fluid and the measured intensity of the radiation. |
