PSN-L Email List Message
Subject: Re: Simple mini horizontal
From: John or Jan Lahr JohnJan@........
Date: Tue, 04 Jan 2005 11:09:47 -0700
I'm curious how your recording is going? Did you catch the M 9 Sumatra event?
I'm working with some students that the Colorado School of Mines who are
in photo detection. Would you be willing to share your electronic circuit
I've been recommending using one light source and two detectors arranged so
when a flag is centered, both sensors are equally illuminated. Any
the light to one and decreases it to the other. Since the output of
interest is the difference
between the two sensors, slight variations in the brightness of the light
will not cause
a false signal.
At 03:52 PM 4/7/2004, you wrote:
>John has kindly posted my attempt at a 'mini horizontal' seismograph, if you
>are interested please go to:
>I would be grateful for an comments or improvements you may think I might
>incorporate in the unit, especially in the area of feed back to the light
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