[phoenix-project] Re: Can we do experiments like simple pendulum oscillations to study dumping factor.
- From: "Prof.S.K. Chakarvarti" <skchakarvarti@xxxxxxxxx>
- To: Georges Khaznadar <georges.khaznadar@xxxxxxx>
- Date: Wed, 10 Dec 2014 10:57:07 +0530
Dear Georges:
Mine one is somewhat similar to the one you have talked of. better if you
can read my article. It describes a simple experiment for displaying phase
angle between voltage and current in ac circuits, besides many other
experiments are also suggested like finding equipotential line, beats
phenomenon(electrical analogue) etc.
Sincerely
*Dr.S.K.ChakarvartiProfessor & Assoc.Dean Research & DevelopmentManav
Rachna International University(MRIU),Faridabad,India.Mob:+919560299010*
*Formerly*
*Dean Academic,Professor, Chairman and Controller of ExamsNational
Institute of Technology(Institution of National Importance)Kurukshetra-136
119, India*
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On 10 December 2014 at 00:49, Georges Khaznadar <georges.khaznadar@xxxxxxx>
wrote:
> Hello,
>
> Prof.S.K. Chakarvarti a écrit :
> > Has some one tried a mechanical Oscillator using a simple pendulum to
> > produce oscillations as low as faction of a Hertz(Can replace therefore
> > Wien Bridge Oscillator for low frequency) with the beauty that the
> traces
> > can be seen on an Oscilloscope and there is no need of amplification
> > required?
>
> In my high school (lycée Jean Bart, Dunkirk, France), we are using on a
> regular base a slow oscillator, which is made as follows:
>
> A heavy cylinder hangs under a flexible string, to provide low-freqency
> oscillations. Some additional threads are added to ensure a good
> electric conductivity from the top of the spring to the bottom of the
> cylinder, which is fitted with an insulated copper wire to extend it
> below.
>
> So, when you consider the copper wire below, it is surrounded by
> insulating stuff, excepted in its lower end, which acts as a small
> oscilating point, with excellent conductivity. This point is used as the
> cursor of a "liquid potentiometer".
>
> The body of the liquid potentiometer is made of copper sulphate
> dissolved in water (a very small concentration is enough). A graduated
> cylinder is filled with this solution. Two electrodes made of insulated
> copper are prepared; each of them is terminated by a non-insulated
> copper circle, which is bent at right angle relative to the insulated
> part of the wire. The longest wire is inserted in the cylinder, so that
> the bare circle defines an equipotential near the lower end of the
> cylinder. The shortest wire is inserted higher in order to define
> another equipotential near the surface of the solution. Both electrodes
> are submitted to a small regulated voltage. You must check that the
> electolysis current remains low enough (hence the low concentration of
> CuSO_4).
>
> Then the oscillating part is hung to let the bare copper tip which acts
> as the liquid potentiometer's cursor, to be in equilibrium near the
> middle equipotential (as far from the highest circle than from the lowest
> one). As soon as the oscillator is excited, you get an excellent
> electric signal by connecting your scope's input to the spring.
>
> Best regards, Georges.
>
>
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