Abstract:
A Spectrometer System and a Method for Compensating for Time Periodic Perturbations of an Interferogram generated by the Spectrometer System A spectrometer system (2) comprises a scanning interferometer (4); a drive system (6) mechanically coupled to a movable reflector element (14) of the scanning interferometer (4) and operable to effect reciprocation of the movable reflector element (14)at a plurality, preferably more than two, for example three, different scan speeds; a detector arrangement (8) configured to sample at equidistant time intervals an interferogram formed by the scanning interferometer (2) to generate a sampled interferogram; and a data processor (10) is adapted to acquire a sampled interferogram at each of the plurality of different scan speeds and to perform a relative comparison of the content of the so acquired plurality of sampled interferograms.
Abstract:
A microfluidic impedance flow cytometer ('MIC') device (2) comprises a substrate (4) in which is formed at least one flow channel (6) for leading through a particle (22) containing fluidic sample. The flow channel (6) is formed with a focusing zone (12) and a measurement zone (14) located downstream of the focusing zone (12) in the direction of through flow and provided with an electrode arrangement (18) for characterising particles (22) in the flowing fluidic sample by means of electrical impedance wherein an acoustophoretic particle focusing arrangement (20) is provided in acoustic coupling to the flow channel (6) in the focusing zone (12) to induce acoustic forces in fluid in the flow channel (6) so as to effect a lateral and/or vertical focusing of particles before flowing to the measurement zone (14).
Abstract:
Communication between RFID tags and RFID reader conveyed by an inductive link comprising a first ( 114 , 212 , 324 )and a second coil ( 118 , 216 , 328 ) interconnected by a pair of conductors ( 116 , 326 ) characterised in that the first coil ( 114 , 212 , 324 ) is configured to interact electromagnetically with a communication unit ( 110 , 210 , 320 ) and the second coil ( 118 , 216 , 328 ) is configured to interact electromagnetically with a wireless memory unit ( 122 , 316 ). The inductive link may be realised as conducting wires or as cut-outs of metal plate, and possibly employed for specifically accessing individual RFID tags by using a switching means, and employed in a system for identification and organisation of laboratory samples.
Abstract:
An interferometer (70) for observing a source of observed radiation (10) employing a source of reference radiation (12) characterised in that the interferometer (70) is configured to provide a ratio between the retardation of reference radiation and the retardation of observed radiation which is higher than 1.
Abstract:
An apparatus, such as a flow cytometer, for determining compositional properties of a material (38), comprises sensing means (24) having an output responsive to components of interest within a sample, here liquid (38), at a measurement location (22). A flow regulator, such as a pump (36), is provided in flow communication with the measurement location (22) and with the liquid sample (38). Control means (34) is adapted to analyse, such as by employment of an pulse height analyser (32), the output to determine a contribution thereto by noise and to control the operation of the flow regulator (36) to regulate presentation of the sample, here the flow rate, at the measurement location (22) in a manner dependent on the determined noise contribution.
Abstract:
A spectrophotometer (2) comprising a source of radiation (6), preferably optical radiation, disposed to emit radiation at a plurality of wavelengths towards a sample in a sample holder (4) and a detection arrangement 8 for detecting the radiation after its interaction with the sample. The sample holder (4) is adapted to present a plurality of different path lengths for the emitted radiation through the sample. An arithmetic unit (10;10b) is operably connected to receive an intensity dependent output from the detection arrangement (8) and is adapted to store an intensity value of the detected emitted radiation indexed to its wavelength at two or more path lengths of the plurality of different path lengths and to calculate a value dependent on the ratio of the indexed intensity values at each of two path lengths by which an indication of the presence of a substance of interest withiA spectrophotometer (2) comprise a source of radiation (6), preferably optical radiation, disposed to emit radiation at a plurality of wavelengths towards a sample in a sample holder (4) and a detection arrangement 8 for detecting the radiation after its interaction with the sample. The sample holder (4) is adapted to present a plurality of different path lengths for the emitted radiation through the sample. An arithmetic unit (10;10b) is operably connected to receive an intensity dependent output from the detection arrangement (8) and is adapted to store an intensity value of the detected emitted radiation indexed to its wavelength at two or more path lengths of the plurality of different path lengths and to calculate a value dependent on the ratio of the indexed intensity values at each of two path lengths by which an indication of the presence of a substance of interest within the retained sample can be obtained.
Abstract:
A measurement system (2) for determining analyte information of a test sample comprises a reader (16) for reading into the measurement system (2) data held in an information unit of a portable holder (18) containing a reference material. A measurement instrument (10) is provided that operates according to a first measurement methodology to generate reference measurement data to be employed within the system (2) in determining analyte information of the reference material. The data processor (12) is configured to effect a comparison of so determined analyte information of the reference material with corresponding expected analyte information obtained from the data read into the measurement system (2) generated by a second, different measurement methodology and to generate a signal dependent on the comparison for subsequent use within the measurement system (2).
Abstract:
An apparatus for the determination of sulphur content of marine fuel oil in a marine vessel propulsion system comprises a sampling station (8) adapted to present a sample of the marine fuel oil for analysis to an analyser having a complementary emitter (16,20) and detector (22,24,26) arrangement configured to respectively couple energy in one or both of the infra red and near infra red spectral regions into and to detect coupled energy after its interaction with, the marine fuel oil presented for analysis. The optical analyser further comprises a spectrometer (14) for generating a representation of an intensity variation of the detected coupled energy and computational means (28,32) adapted to analyse the representation to produce output signals (30) indicating a sulphur content of the marine fuel oil usable in control of functional elements of the marine vessel propulsion system.
Abstract:
The content of casein in milk is determined by two measurements of infrared absorbance in a milk sample by infrared spectrometry before and after a separation of the casein. The casein content is calculated by use of absorbance data recorded during the two absorbance measurements. The new method is considerable faster than the known wet-chemical methods, such as the normal wet chemical reference method for casein determination in milk using a Kjeldahl nitrogen determination of the milk sample, then a coagulation of the milk, and finally a Kjeldahl nitrogen determination of the filtrate. Further the new method provides a more reliable accuracy than the know determination using a single infrared analysis of a milk sample.