| 摘要 |
A sensor and method is provided for monitoring a mineral acid dissolved in a liquid. The sensor includes an internal reflection window 4 which, in use, is in direct contact with the liquid. The sensor further includes a mid-infrared light source 1 which directs a beam of mid-infrared radiation into said window for attenuated internal reflection at an interface between the window and the liquid. The sensor further includes a first narrow bandpass filter 5 which preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of the dissolved mineral acid to filter internally reflected mid-infrared radiation received from the window. The sensor further includes an infrared detector 6 which detects filtered mid-infrared radiation transmitted through the first filter. The sensor further includes a processor arrangement 7 operably coupled to the infrared detector, which measures the intensity of the detected mid-infrared radiation transmitted through the first filter; and determines therefrom an amount of the mineral acid dissolved in the liquid. In one embodiment, the liquid in a well is monitored. A further sensor may be provided for monitoring CO2 in a fluid. |
