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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(10) [October 2011] >
| Title: | Practical method for thermal compensation of long-period compound pendulum |
| Authors: | Popkonstantinovic, Branislav
Miladinovic, Ljubomir
Stoimenov, Miodrag
Petrovic, Dragan
Petrovic, Nebojsa
Ostojic, Gordana
Stankovski, Stevan |
| Keywords: | Clock
Thermal compensation
Dilatation
Compound pendulum
Temperature |
| Issue Date: | Oct-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The methods for
compensation of the clock pendulum thermal dilatation presented in literature
are based on combined analytical and experimental procedures. As a rule, the
mass center position is always compensated analytically with sufficiently large
factor of safety, while the refinements are obtained experimentally. An
analytical method has been studied for the pendulum thermal compensation which
considers not only the mass center but also the pendulum mass moments of
inertia of the first and the second order. Fast and efficient mathematical
method as well as the practical constructive solutions are presented which
allow the technically acceptable thermal compensation of the long period
compound pendulum. The proposed calculation procedures are iterative and fast
converging, which make them suitable not only for the design of vintage “wood
rod - lead bob” pendulums, but also for the modern pendulums which feature rods
thermally compensated by invar alloy. Moreover, the proposed principles and
methods are useful in all scientific measurements where the effect of thermal
noise must be minimized or even eliminated. |
| Page(s): | 657-664 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(10) [October 2011]
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