Abstract:
A liquid analyzer (2) comprises a liquid sample intake (4) for immersion in a liquid sample (6); at least one measurement zone (16;16'); and a first pump module (P1) operable to effect liquid flow from sample intake (4) towards the at least one measurement zone (16;16'). A first pressure monitor (36) is provided to measure pressure between the sample intake (4) and the at least one measurement zone (16'16') and the operation of the first pump module (P1) to regulate the liquid flow in the liquid conduits (22) is regulated in dependence thereon.
Abstract:
A method of performing an optical analysis of a liquid containing dissolved gas comprising the steps of A: transferring an amount of the liquid from a reservoir into a piston pump; B: holding the transferred amount at or close to ambient to permit partial degassing; C: transferring a liquid sample from the pump and into a measurement cell under a pressure greater than ambient; and D: performing an optical analysis of the pressurised, partially degassed liquid sample.
Abstract:
A method of compensating for amplitude drift in a spectrometer comprising: making successive performances of a standardisation process to generate, at each performance, a mathematical transform to compensate for amplitude drift for application by an arithmetic unit to a spectrum obtained by the spectrometer in an interval between the performances; modifying the mathematical transform with a function dependent on spectral data from a zero material measured in association with the standardisation process and the single beam zero spectrum measured in an interval between performances; and applying the modified mathematical transform to a spectrum from an unknown sample.
Abstract:
A liquid analyzer comprises a liquid sample intake for immersion in a liquid sample; at least one measurement zone; and a first pump module operable to effect liquid flow from sample intake towards the at least one measurement zone. A first pressure monitor is provided to measure pressure between the sample intake and the at least one measurement zone and the operation of the first pump module to regulate the liquid flow in the liquid conduits is regulated in dependence thereon.
Abstract:
A liquid analyzer comprises a liquid sample intake for immersion in a liquid sample; at least one measurement zone; and a first pump module operable to effect liquid flow from sample intake towards the at least one measurement zone. A first pressure monitor is provided to measure pressure between the sample intake and the at least one measurement zone and the operation of the first pump module to regulate the liquid flow in the liquid conduits is regulated in dependence thereon.
Abstract:
A system (102) for determining properties of a sample (114) comprises a LIBS detector (104,106) and an infra-red absorption detector (108,110) for interrogating a sample (114) to generate LIBS spectral data and infra-red absorption spectral data respectively; and a data processor (112) adapted to apply at least one chemometric prediction model, each constructed to link, preferably quantitatively link, features of both LIBS and absorption spectral data to a different specific property of the sample, to a combined dataset derived from at least portions of both the LIBS and the absorption data to generate therefrom a determination, preferably a quantitative determination, of the specific property linked by that model.
Abstract:
The invention provides a method for standardising an infrared spectrometer based on spectral patterns of constituents of atmospheric air naturally occurring in the spectrometer. The invention also provides a spectrometer applying the method. The method selects a spectral pattern in a recorded spectrum and determines a wavelength dependent position value for a feature, such as the centre of the pattern. This value is compared to a reference value that may be obtained from a spectrum recorded by a master instrument, and a standardisation formula can be determined. The absorption peaks from CO2 (g)around 2350 cm-1 are preferred as the selected pattern. The method renders the use of reference samples unnecessary and allows for the standardisation to be performed simultaneously with the recording of a spectrum of a sample of interest.