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Development and testing of a method for continuous mass measurement dielectric materials samples during microwave heat treatment
https://doi.org/10.32446/0368-1025it.2022-12-30-34
Abstract
The paper considers methods of continuous measurement of dielectric material samples mass during microwave heat treatment at a frequency of 2.45 GHz. It is known that the direct measurement of the sample mass by electronic scales during microwave treatment is a complex problem. The main limiting factor is the difficulty of using conductive materials inside the working chamber due to the induction of currents in them, which distort the measurement results. The paper proposes a technique for continuously measuring the mass of dielectric material samples during microwave heat treatment. The technique is based on thermogravimetric analysis methods. We developed an original measuring system based on the theoretical technique. It consists of separate modules – a hanger with a sample (inside the working chamber) and a strain gauge, a spectrometer and signal processing and conversion systems (all outside the chamber). The use of a modular layout has a number of advantages. It allows the measuring system to be as far away as possible from the source of electromagnetic radiation. Therefore, it allows to avoid signal distortion and isolate the measuring equipment from microwave influence. The developed technique of continuous measurement of sample mass during microwave heat treatment was tested. The dependences of mass changes were obtained. These dependencies revealed two characteristic stages of material carbonization which differ in the rate of change in sample mass. The total error of the technique is less than 1 %. The quantization error makes the main contribution to the error in the analogto-digital conversion. The proposed technique can be used in automated control systems for microwave processing of materials.
Keywords
mass measurements,
dielectric material,
microwave heat treatment,
thermogravimetry,
spectral pyrometry,
strain gauge,
cotton linter
Supporting agencies: the research was carried out at the Research Institute of Advanced Materials and Technology in the framework of the state task of 2022 under the project FNER-2022-0002.
About the Authors
E. V. Matveev
Research Institute of Advanced Materials and Technology
Russian Federation
Russian Federation
Egor V. Matveev
Moscow
V. V. Berestov
Research Institute of Advanced Materials and Technology
Russian Federation
Russian Federation
Valentin V. Berestov
Moscow
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For citations:
Matveev E.V., Berestov V.V. Development and testing of a method for continuous mass measurement dielectric materials samples during microwave heat treatment. Izmeritel`naya Tekhnika. 2022;(12):30-34. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-12-30-34
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