Device for collecting samples

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250341, G01N 2100

Patent

active

048271349

ABSTRACT:
As a means for connecting a gas chromatograph and an IR-spectrometer, devices are used which include a cooled carrier which allows to condensate the substances supplied by the gas chromatograph on its surface where they may be examined by spectroscopy. The examination of a new sample makes necessary the evaporation of the substances condensated on this surface before. Up to now, the heating and the cooling of the carrier which was necessary to this end, took a rather long time. Further, the heating of the carrier was limited to a temperature at which not all substances could be completely eliminated from the surface of the carrier. Now, the invention provides for a thermal decoupling of the carrier from the cooling device. Such decoupling allows to heat the carrier to higher tempreatures and to reduce the time needed for performing a measuring cycle, since as a result of the decoupling the cooling device is not heated but the heating is limited to the small mass of the carrier. A removable coupling may be effected by means of a thermally conducting mechanical connection which may be separated, of a gas stream which may be interrupted, or of moving the carrier from a cooling zone to a heating zone.

REFERENCES:
patent: 4158772 (1979-06-01), Reedy
patent: 4218892 (1980-08-01), Stephens
patent: 4594226 (1986-06-01), Reedy
patent: 4688936 (1987-08-01), Reedy
Applied Spectroscopy, vol. 40, No. 5, 1986, "A Multisurface Matrix-Isolation Apparatus" by Robert H. Hauge, Leif Fredin, Zakya H. Kafafi, and John L. Margrave, pp. 588 to 595.

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