# air impedance measurement!

Hi,
I would like to make a device to measure the impedance of the air. I use a ac current source, (i.e.1kHz) to pass through two electrode in a fix distance. What is the possible value of the impedance of the air?
Thank you very much!
Wayne
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Impedance or resistance? What distance? It is a non-linear function. What Altitude and Humidity?
Try electrodes at 1/2 inch at 10,000 volts 0.01 ma. then reduce the gap.
The impedance is very high, then when the arc strikes the impedance drops low. Resistance of air 10 to 10,000 Megohms, however when arc struck (arcing) much lower, below 1 megohm, depending upon distance or the gap.
<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV><FONT face=Arial size=2>Hi,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I would like to make a device to measure the impedance of the air. I use a ac current source, (i.e.1kHz) to pass through two electrode in a fix distance. What is the possible value of the impedance of the air? </FONT></DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp; Thank you very much!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Wayne</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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You would not be measuring resistance with an ac voltage. You would be measuring the capacity of the electrodes.
<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV><FONT face=Arial size=2>Hi,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I would like to make a device to measure the impedance of the air. I use a ac current source, (i.e.1kHz) to pass through two electrode in a fix distance. What is the possible value of the impedance of the air? </FONT></DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp; Thank you very much!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Wayne</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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Hi, The distance between the two electrodes are 2cm and they are in the free air! What is the value of the impedance? Thank you!
Wayne
<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV><FONT face=Arial size=2>Hi,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I would like to make a device to measure the impedance of the air. I use a ac current source, (i.e.1kHz) to pass through two electrode in a fix distance. What is the possible value of the impedance of the air? </FONT></DIV> <DIV><FONT face=Arial size=2>&nbsp;&nbsp;&nbsp; Thank you very much!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV> <DIV><FONT face=Arial size=2>Wayne</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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this format, some or all of this message may not be legible.
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in article ca6jrt\$2dkf\$ snipped-for-privacy@justice.itsc.cuhk.edu.hk, Wayne at ares snipped-for-privacy@hotmail.com wrote on 6/9/04 2:05 AM:
The distance between the two electrodes are 2cm and they are in the free air! What is the value of the impedance? Thank you!
Instead framing the question as given, it may be more sensible to describe the configuration accurately AND to describe the measurement equipment and how it is connected. "Impedance" is probabl;y too general a term.
Bill
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<HTML> <HEAD> <TITLE>Re: air impedance measurement!</TITLE> </HEAD> <BODY> in article ca6jrt\$2dkf\$ snipped-for-privacy@justice.itsc.cuhk.edu.hk, Wayne at ares snipped-for-privacy@hotmail.com wrote on 6/9/04 2:05 AM:<BR> <BR> <BLOCKQUOTE> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The distance between the two electrodes are 2cm and they are in the free air!<BR> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;What is the value of the impedance? Thank you!<BR> </BLOCKQUOTE><BR> Instead framing the question as given, it may be more sensible to describe the configuration accurately AND to describe the measurement equipment and how it is connected. &quot;Impedance&quot; is probabl;y too general a term.<BR> <BR> Bill </BODY> </HTML>
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