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Reconstruction of thermokinetics from calorimetric data by means of numerical inverse filters

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Abstract

A simple method for removing the distortion due to thermal lags from calorimetric curves is described and tested. The method is based upon the use of numerical inverse filters. Its results are equivalent to those of the more sophisticated deconvolution methods, using Fourier transform analysis or state function theory. The new method is easily adapted to the on-line reconstruction of calorimetric data by means of a microprocessor.

Résumé

Une méthode simple pour la correction de la distorsion des courbes calorimétriques, amenée par l'inertie thermique, est décrite et éprouvée. La méthode est basée sur l'emploi de filtres numériques inverses. Les résultats obtenus sont équivalents à ceux fournis par des méthodes plus complexes de déconvolution, utilisant l'analyse harmonique ou la théorie des variables d'état. La nouvelle méthode peut être facilement adaptée à la correction simultanée des courbes calorimétriques au moyen d'un microprocesseur.

Zusammenfassung

Eine einfache Methode zur Beseitigung der infolge thermischer Hysterese-Effekte entstandenen Verzerrungen kalorimetrischer Kurven wurde beschrieben und geprüft. Die Methode beruht auf der Anwendung numerischer Inversfilter. Die Ergebnisse sind den durch verfeinertere Dekonvolutionsmethoden unter Einsatz der Analyse durch Fouriertransformation oder durch die Zustandsfunktionstheorie erhaltenen gleichwertig. Die neue Methode läßt sich der on-line Erfassung kalorimetrischer Daten durch einen Mikroprocessor leicht anpassen.

Резюме

Описан и проверен про стой метод для удален ия нарушения из калорим етрических кривых, которое вызва но термическими запа здываниями. Метод основан на испо льзовании численных обратных ф ильтров. Результаты э того метода эквивалентны резуль татам, полученным более усл ожненными деконволю ционными методами при использ овании Фурье-преобразовани я и теории функций. Нов ый метод легко адаптируется к перестройке на линии связи с ЭВМ ка лориметрических дан ных с помощью микропроцес сора.

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Point, R., Petit, J.L. & Gravelle, P.C. Reconstruction of thermokinetics from calorimetric data by means of numerical inverse filters. Journal of Thermal Analysis 17, 383–393 (1979). https://doi.org/10.1007/BF01914029

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  • DOI: https://doi.org/10.1007/BF01914029

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