System and method for characterizing a sample by...

G - Physics – 01 – N

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G01N 27/72 (2006.01) G01N 23/00 (2006.01)

Patent

CA 2684009

A method and apparatus for interrogating a sample that exhibits molecular rotation are disclosed. In practicing the method, the sample is placed in a container having both magnetic and electromagnetic shielding, and Gaussian noise is injected into the sample. An electromagnetic time-domain signal composed of sample source radiation superimposed on the injected Gaussian noise is detected, and this signal is cross-correlated with a second time- domain signal produced by the same or similar sample, to produce a cross-correlated signal with frequency domain components. The latter is plotted in the frequency domain by a fast Fourier transform to produce a frequency domain spectrum in a frequency range within DC to 50KHz. From this spectrum, one or more low frequency signal components that are characteristic of the sample being interrogated are identified.

Procédé et appareil d'analyse d'échantillon présentant une rotation moléculaire. Le procédé consiste à placer l'échantillon dans un contenant à protection magnétique et électromagnétique et à introduire un bruit gaussien dans l'échantillon. Un signal électromagnétique en domaine temporel composé du rayonnement de la source de l'échantillon superposée au bruit gaussien introduit est détecté et mis en corrélation croisée avec un second signal en domaine temporel produit par le même échantillon ou un échantillon similaire, afin de produire un signal à corrélation croisée avec des composants en domaine fréquentiel. Ce dernier est relevé dans l'analyse fréquentielle par une transformation de Fourier rapide pour produire un spectre en domaine fréquentiel dont la gamme de fréquences du CC de 50 kHz. € partir de ce spectre, un ou plusieurs composants de signal à basse fréquence qui sont des caractéristiques de l'échantillon soumis à l'analyse sont distingués.

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