摘要:
The invention relates to a gas chromatograph for the analysis of gas samples. It has a feed arrangement for feeding the sample, an open tubular capillary column for separating the components of the sample, temperature control means for controlling the temperature of the column, and a detector for detecting the separated components of the sample. The efficiency has been improved and a convenient hand-held version has been made possible by constructing the column of a bundle of open tubular capillaries having a gas permeable wall comprising a polymer membrane. The invention also relates to the use of such a column together with a detector for identifying gaseous samples.
摘要:
The invention relates to a method for measurement of process analytes by ion mobility spectrometry. Gas contents are measured in the method and the so obtained gas content values are used to control the progress of a chemical process. An ion mobility spectrometer of aspiration type is used as the instrument.
摘要:
The invention relates to a method and device for measuring gaseous substances, in which the method comprises the stages: ionization of the sample gas in a gas flow, leading of the ionized gas flow through an elongated ion-mobility measuring chamber in the cross-section defined by it, filtering out of ions from the ionized gas flow at a distance from the measuring electrodes, permitting the passage of only the ions travelling from the flow cross-section at the selected point, separation of ions with a different ion mobility, with the aid of a transverse static electric field and at least one measuring-electrode pair arranged along the wall of the measuring chamber.
摘要:
The invention relates to a method for chemical analysts, in which a gas flow is ionized, the ionized gas flow is led to a filtering area fitted to the flow channel, the ionized gas flow is filtered using the DMS/FAIMS method, in order to remove at least some of the ions from the gas flow. A parallel mainly non-ionized gas flow, which is on at least one side of the ionized gas flow, is led to the filtering area together with the ionized gas flow. The invention also relates to a corresponding structure.
摘要:
The invention relates to a method for detecting biological material in an airstream, in which method the airstream is fed with the aid of sampling devices, a light beam is emitted towards the airstream, a fluorescence signal depicting the fluorescence of the particle is created, a scattering signal depicting the scattering of the light of the particle is created, the fluorescence signal and the scattering signal are converted into discrete values, and an alarm value is defined. The discrete values are recorded cumulatively as hit points in an at least 2-dimensional measurement space equipped with selected dimensions, at least one index area is preselected from the measurement space, a cumulative index is calculated at an index frequency from the hit points accumulated on the each preselected index area, and an alarm value, showing the presence of a selected biological material, is defined from the indices by using a preselected criterion.
摘要:
The invention relates to equipment for concentrating and analyzing components contained in a flowing medium, and an analyzing method applying said equipment. The analyzing equipment comprises a concentrator (1 ), including a porous sorbent bed (3), in which components can be absorbed or adsorbed from the medium flow, said bed being electroconductive, so that components can be desorbed to a washing flow by heating the bed with electric current; and to an analyzer (2) defining the desorbed components, said analyzer being for instance a gas detector. According to the invention, the sorbent bed is in the flowing direction widened towards its outlet end (5), having for example the shape of a truncated cone. By means of the invention, the temperature in the sorbent bed is equalized by transferring heat in the washing flow towards the bed outlet end, which end receives a weaker heating effect per unit of volume, owing to the widening shape of the bed.
摘要:
Micro hot-plate solid state gas sensor structure that comprises an additional buried electrode structure in the sensor structure, the structure being arranged to be applicable in related devices. The invention relates also to a measurement method of sensor resistance, which comprises a step of having a bias voltage or a grounding applied to the buried electrode.
摘要:
The invention relates to a method for measurement of process analytes by ion mobility spectrometry. Gas contents are measured in the method and the so obtained gas content values are used to control the progress of a chemical process. An ion mobility spectrometer of aspiration type is used as the instrument.