Scientific and Technical Journal

ELECTROTECHNIC AND COMPUTER SYSTEMS

ISSN Print 2221-3937
ISSN Online 2221-3805
CAPACITANCE DILATOMETER FOR MEASURING OF LINEAR THERMAL EXPANSION OVER WIDE TEMPERATURE RANGE
Abstract:
One of the promising methods for studying linear expansion coefficients of the materials is the use of capacitive dilatometer.It was considered possibility of making a dilatometer with the linear transmission characteristic and a high sensitivity for a wide range of temperatures.It was suggested building a capacitive dilatometer with a converter capacity on the basis of the frequency of the relaxation RC oscillator. Since the frequency of the oscillator can not be selected arbitrarily, there is a problem in accurately measuring frequency during limited time interval. It has been shown that for adequate determination of the frequency of the oscillator, and consequently the size of the sample changing its temperature, should be used a method of capturing the front relaxation oscillator oscillations. In this case, the frequency measurement takes time about 1 secon, with measurement error 1 / 16Hz. This allows us to get dilatometer permission with a sensitivity of 6.85 Hz / Nm near 0.1 Å. The result has been confirmed experimentally.
Authors:
Keywords
DOI
10.15276/etks.18.94.2015.18
References
1. Barron T.H.K., and White G.K., (1999), Heat Capacity and Thermal Expansion at Low Temperatures, Kluwer Academic, New York.
2. Yates B., (1972), Thermal Expansion Plenum, New York.
3. Kanagaraj S., and Pattanayak S., (2003), Cryogenics 43, 399.
4. Andres K., (1961), Cryogenics 2, 93 _1961_; K. Andres and H. Rohrer, Helv. Phys. Acta 34, 398.
5 Neumeier J.J., Bollinger R.K., Timmins G.E., Lane C.R., Krogstad R.D., and Macaluso J., (2008), “Capacitive-based Dilatometer cell Constructed of Fused Quartz for Measuring the Thermal Expansion of Solids”, Review of Scientific Instruments 79, 033903 (2008).)
6. Sharipov I., and Mulukov H. Dylatometr dlya izmereniya teplovogo rasshyreniya obrazcov malogo razmera [Dilatometer for Measurements of Thermal Expansion of the Small Size Samples], (2011), Vestnik UGATU, Electronika, Izmeritelnaya Tehnika, Radiotehnika I Svyaz', UFA, Vol. 15, No. 3(43), pp. 109 –111 (In Russian).
7. Brindli K. Izmeritelniye preobrazovateli. [Measuring Transducers], (1991), Spravochnoye posobiye. Moscow, Russian Federation, Energoatomizdat, 113 p. (In Russian).
8. Johansson, Staffan, (2013), “New Frequency Counting Principle Improves Resolution”. Spectracom. Retrieved 24 July 2013. Available at:
http://www.spectracomcorp.com/SearchResults/tabid/1551/Default.aspx/Default.aspx?q=Johansson (accessed 06.04.2015).
9. 8-bit Atmel Microcontroller with 8KB In-System Programmable Flash. Available at:
http://www.atmel.com/images/atmel-8159-8-bit-avr-microcontroller-atmega8a_datasheet.pdf (accessed 06.04.2015).
10. Obzor: Koeficient teplovogo rasshyreniya dlya nekotoryh raspostranennyh materialov, takih kak: aluminit, med', steklo, jelezo, I mnogoe drugoye. [Overview: the Coefficient of Linear Thermal Expansion for Some Common Materials, such as Aluminum, Copper, Glass, Iron and More.], (In Russian) Available at: http://www.dpva.info/Guide/GuidePhysics/GuidePhysicsHeatAndTemper ture/HeatexpansionCoefficient/linearExtensionManyMaterials/ (accessed 06.04.2015).
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2017-11-16 11:48:54

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