(meteorobs) OT -13 sq.ft. Electrostatic/Electrophonic Sensoronline.

stange stange34 at sbcglobal.net
Tue Apr 14 14:35:57 EDT 2009


Hello Mark.

Nothing sophisticated here. No facility for quantative calibration. Only 
relative changes of apprx. 180na resolution within a narrow recording limit 
of 7 Volts down to Zero volts due to the DC limit of the Velleman 4 channel 
data logger. It cannot record any Negative going voltages below zero. :-(

Simple CMOS FET's, unity gain amp's & Butterworth filter. 10Hz bandpass.

Photos of home-brew construction of NEW flat 13 sq.ft. horizontal sensor & 2 
verticle oriented sensors with a typical 170 second data image screen shot 
during wind & moving cloud cover last night. It got worse.... not typical of 
a nice recording evening. I look only for a disturbance association with 
large fireballs near my zenith.
http://www.geocities.com/stange34@sbcglobal.net/3Sensors

Have you had any luck on association?

Larry
YCSentinel


----- Original Message ----- 
From: "Mark Ford" <mark.ford at ssl.gb.com>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2009/04/14 07:12
Subject: Re: (meteorobs) OT -13 sq.ft. Electrostatic/Electrophonic 
Sensoronline.


> Just out of interest What are you using to measure the electrostatic
> charge? Presumably an electrometer?
>
> (I only ask because at work we have designed a PC based (usb)
> electrometer circuit board that is used to measure from 5fA to 200nA.
>
> Best,
> Mark Ford
>
>
>
>
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org] On Behalf Of stange
> Sent: 12 April 2009 08:39
> To: meteorobs at meteorobs.org
> Subject: (meteorobs) OT -13 sq.ft. Electrostatic/Electrophonic Sensor
> online.
>
> Operational early this evening with two other smaller devices. The
> thinking
> is that Electrophonic phenomena might be the sound of ground object
> corona
> emission caused by large fireball wake charges.
> YCSentinel
>
>
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