Vibration Detector (Seismic Detector - Geophone)
Detecting Paranormal Events Through Vibrations
|Ghost Hunting Equipment: Vibration Detector - Seismic Detector - Geophone
Detecting Paranormal Events Through Vibrations
A vibration detector can help aid the ghost hunter in finding possible paranormal activity from the detection of vibrations that cannot be explained.
The theory is that spirits can sometimes manipulate physical objects and the vibration detector may help aid the ghost hunter in detecting paranormal events.
A geophone is a device which converts ground movement (displacement) into voltage, which may be recorded at a recording station. The deviation of this measured voltage from the base line is called the seismic response and is analyzed for structure of the earth.
Geophones have historically been passive analog devices and typically comprise a spring-mounted magnetic mass moving within a wire coil to generate an electrical signal. Recent designs have been based on Microelectromechanical systems technology which generates an electrical response to ground motion through an active feedback circuit to maintain the position of a small piece of silicon.
The response of a coil/magnet geophone is proportional to ground velocity, while microelectromechanical systems devices usually respond proportional to acceleration. Microelectromechanical systems have a much higher noise level (50 dB velocity higher) than geophones and can only be used in strong motion or active seismic applications.
The frequency response of a geophone is that of a harmonic oscillator, fully determined by corner frequency (typically around 10 Hz) and damping (typically 0.707). Since the corner frequency is proportional to the inverse root of the moving mass, geophones with low corner frequencies (< 1Hz) become unpractical.
Geophone for Ghost Hunting
GeoPhone Project for ghost hunting.
Purchased GeoPhone kit and installed
it in a solar powered walk way housing.
I added a toggle switch and 9V
power to it.
It is possible to lower the corner frequency electronically, at the price of higher noise and cost.
Although waves passing through the earth have a three-dimensional nature, geophones are normally constrained to respond to single dimension - usually the vertical.
However, some applications require the full wave to be used and three-component or 3-C geophones are used.
|In analog devices, three moving coil elements
are mounted in an orthogonal arrangement within a single case. The
majority of geophones are used in reflection seismology to record the
energy waves reflected by the subsurface geology.
In this case the primary interest is in the vertical motion of the
Earth's surface. However, not all the waves are upwards travelling.
strong, horizontally transmitted wave known as ground-roll also
generates vertical motion that can obliterate the weaker vertical
By using large areal arrays tuned to the
wavelength of the ground-roll the dominant noise signals can be
attenuated and the weaker data signals reinforced.
Analog geophones are very sensitive devices which can
respond to very distant tremors. These small signals can be drowned by
larger signals from local sources.
It is possible though to recover the small signals caused by large but
distant events by correlating signals from several geophones deployed in
Signals which are registered only at one or few geophones can
be attributed to small, local events and thus discarded.
It can be assumed that small signals that register uniformly at all
geophones in an array can be attributed to a distant and therefore
The sensitivity of passive geophones is typically 30
Volts/(meter/second), so they are in general not a replacement for
Conversely, some applications of geophones are interested only in very
local events. A notable example is in the application of Remote Ground
Sensors (RGS) incorporated in Unattended Ground Sensor (UGS) Systems.
In such an application there is an area of interest which when
penetrated a system operator is to be informed, perhaps by an alert
which could be accompanied by supporting photographic data.
Vibration detectors are used by some ghost hunting groups to help detect vibrations that may be coming from a paranormal source.
The vibration sensors of these detectors will alert the ghost hunter of vibrations within the area.
|Seismic / Shake Detector
for the Gauss Master
This video shows a simple accessory for
the Gauss Master to allow it to
become a sensitive paranormal shake detector for people on a budget.
accessory is very sensitive and easily beats those geophone - red LED
bar-graph paranormal seismic detectors for far less money!
simple, just add a geophone into the external antenna jack of a Gauss
Master or Trifield meter and you have a great, easy, shake detector.
|Building a Geophone to Detect Ground Vibrations on Ghost Hunts
'I saw the Ghost Hunters using a new tool they
called a Geophone.
used it to measure seismic vibration in the ground to see if ghostly
footsteps were actually vibrating the ground like a human's does.
looked into getting one and found that I could only purchase the
components. I wasn't sure how to put it all together at first, and
could not find a website explaining it.
I figured it out, and I decided
to put together a video to help others put one together too.'