How to Prevent Stroboscopic Effect

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Anonymous Poster	How to Prevent Stroboscopic Effect 11/21/2010 11:27 PM
	hi, i am facing this problem of stroboscopic effect in my machine,so i thought of using electronic ballast as it works on high frequency,then again i thought of oscillator which can be used for constant freq o/p.... now please suggest me which oscillator to be used/any alternative method to reduce this effect
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15603 Good Answers: 982	#1 Re: how to prevent stroboscopic effect 11/22/2010 12:46 AM
	Many electronic ballasts for fluorescent lamps do work at a higher frequency, so using an electronic ballast should help. I cannot recommend any specific ballasts because I don't know where you are. Since you haven't noticed, different locations have completely different power grid frequencies and voltages. Now you can also limit the stroboscopic effect by using some non-flickering lamps. A filament lamp like a quartz halogen lamp will not flicker since the filament will continue to glow between cycles. You could regress to a much older technology and use natural sunlight to light your work area. __________________ "Don't disturb my circles." translation of Archimedes last words
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pieface_ie Active Contributor Join Date: Nov 2010 Location: Ireland Posts: 15	#2 Re: how to prevent stroboscopic effect 11/22/2010 1:27 AM
	You can solve this effect by making sure your lighting is correctly spread out among the three phases in the room of the machine in question. The use of "lag-lead" lamps will also solve your problem.
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Hendrik Guru Join Date: Jan 2007 Location: Centurion, South Africa Posts: 3921 Good Answers: 97	#3 In reply to #2 Re: how to prevent stroboscopic effect 11/22/2010 4:01 AM
	Would that help? It is still the same frequency. A DC source used to work. __________________ Never do today what you can put of until tomorrow - Student motto
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pieface_ie Active Contributor Join Date: Nov 2010 Location: Ireland Posts: 15	#4 In reply to #3 Re: how to prevent stroboscopic effect 11/22/2010 9:52 AM
	Yes it would, as the lighting is spread across the different phases the rotating machine will never appear to be stationary due to the lights "switching on and off @50,60hz" as the phases will never be "off" at the same time, providing constant illumination eliminating the possibility of the rotating machine appearing to be still/off.
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msamad Guru Join Date: Feb 2009 Location: Houston, USA Posts: 946 Good Answers: 244	#5 Re: How to Prevent Stroboscopic Effect 11/22/2010 6:48 PM
	There are at least three solutions to your problem, you need to find out which one suits best for you: Use filament (incandescent) bulb instead of fluorescent light (as already suggested). Filament bulbs don't have any stroboscopic effect. Use different phase for the supply of the different fluorescent lights used in the same area (as already suggested) Use the fixture with two fluorescent lights in which a capacitor is used to shift the phase of the lamps one from another (one lamp is connected directly and another one through a capacitor in series – this shifts the phase angle of second lamp by almost 90 degree) Same frequency is not a problem for the elimination of the stroboscopic effect. It requires not to happen the zero current moment of all the fluorescent lights in the room simultaneously. - MS __________________ "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
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jinxnao Power-User Join Date: Mar 2007 Posts: 310	#6 In reply to #5 Re: How to Prevent Stroboscopic Effect 07/04/2011 3:51 AM
	how do you call such a flourescent lamp ? I mean one which have capacitors to shift the phase. Is there a special name for it=? __________________ jinxnao
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Hendrik (1); jinxnao (1); msamad (1); pieface_ie (2); redfred (1)

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