CHOICE OF GENERATOR’S WORKING FREQUENCY DURING THE MONITORING AND CONTROL OF MOISTURE TRANSFER IN MUSEUM’S EXHIBITS/PICTURES WITH THE HELP OF UHF/EHF ENERGY ABSORPTION METHOD
Keywords:
choice, working frequency, generator, monitoring, control, moisture transfer, museum’s exhibit, painting canvas, method, absorption, UHF/EHF electromagnetic waves, nonheat intensity, energyAbstract
In order to monitoring and control of moisture transfer in museum’s exhibits (for example, in pictures of painters – masters of past centuries, hobbles, sculptures etc.), one may use the method of electromagnetic waves energy absorption (UHF – radio frequency range and EHF – range o millimeter waves) with a very low level of heat intensity of these waves. The control of moisture transfer in museum’s exhibits with a help of such method is based on a phenomenon of UHF/EHF electromagnetic waves absorption, when they have non-heat intensity, during the process of transmission of such waves along dispersive systems (just so may be called the canvases of a pictures, a paints, protective layer on a canvases (polish), etc.). This value of absorption is determined by the quantity of a free water and by the conductivity of researched object, as well. When canvases are exhibited at museum’s rooms (painting galleries), the volume content of a water in the system and its conductivity are increased, and that’s why they may have such values which can destroy the canvases’ condition of being intact (for example, their materials), there are cracks in a canvases, their bending and so on. All these phenomena destroy canvases during a certain period of time. By the way, UHF/EHF electromagnetic waves of non-heat intensity have such values of it in order to no destroy the exhibit/canvas surface during the act of absorption of incident/reflected electromagnetic search signal in the thin surface layer. The additive moisture transfer into museum’s exhibits is due to the flow of visitors at museum’s rooms (at painting gallery) just during those days when exhibitions are. If one has the stabilization of UHF/EHF energy absorption which may be obtained with the help of a special control system of microclimate of museum’s rooms, then the process of destroying of canvases/exhibits may be suspend (or may be substantially decreased). The accuracy of determination of absorption parameters of UHF/EHF energy with the help of this method substantially depends on some factors (for example, the working frequency of electromagnetic waves generator, the accuracy of its tuning, the bandwidth of frequency range of emission, etc.). These factors are connected with an accuracy of measuring of UHF/EHF signal attenuation (with the help of UHF/EHF reflectometer method) and with a characteristic properties of the researching exhibit/canvas.
References
Атаев С.С. Об автоматизации контроля уплотнения бетонной смеси / С.С. Атаев, Н.П. Блещик, И.И. Монастырный // Бетон и железобетон. – 1972. – №12. – С. 12-18.
Михалевич А.А. Диэлектрические свойства цементного теста / А.А. Михалевич, Н.К. Кобляков // Тезисы сообщений к Всесоюзной конференции "Повышение эффективности и качества бетона и железобетона". – Минск, 1977. – Ч.1. – С. 45-56.
Хиппель А.Р. Диэлектрики и волны / А.Р. Хиппель. – М.: ИЛ, 1960. – 439 с.
Михалевич А.А. Диэлектрические характеристики цементно-песчаных растворов на сверхвысоких частотах / А.А. Михалевич, Н.К. Кобляков // Вопросы строительства и архитектуры. – Минск, 1979. – № 9. – С. 33-37.
Духин С.С. Диэлектрические явления и двойной слой в дисперсных системах и полиэлектролитах / С.С. Духин, В.Н. Шилов. – Киев: Наукова думка, 1972. – 206 с.
Hasted J.B. The dielectric properties of water in solutions / J.B. Hasted, S.H.M. El Sabeh // Frans. Faraday Soc. – 1953. – Vol. 49. – № 369. – P.109-123.
Ахвердов И.Н. Неразрушающий контроль качества бетона по электропроводности / И.Н. Ахвердов, Л.Н. Маргулис. – Минск: Наука и техника, 1975. – 174 с.
Малинин Ю.С. Исследование факторов, влияющих на удельное омическое сопротивление цементного теста / Ю.С. Малинин, С.Е. Ленский // Труды Всесоюзного научно-исследовательского института цементной промышленности. – 1967. – №2. – С. 116-124.
Берлинер М.А. Измерение влажности бетонной смеси и её компонентов влагомерами СВЧ / М.А. Берлинер, В.А. Иванов, В.А. Клоков // Бетон и железобетон. – 1969. – №2. – С. 8-15.
Гаврилов Ю.С. Справочник по радиоизмерительным приборам / Ю.С. Гаврилов, А.А. Ерёменко, Л.Ю. Зубилевич и др. – М.: Энергия, 1976. – 624 c.
Бензарь В.К. Техника СВЧ-влагометрии / В.К. Бензарь. – Минск: ВШ, 1974. – 349 c.
Харвей А.Ф. Техника сверхвысоких частот / А.Ф. Харвей. – М.: Советское радио, 1965. – Т. 1. – 784 c.
