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en:vmds

Visual Meteor Detection Station VMDS01A

Technical equipment

Following technical equipment is used by a visual meteor detection amateur network CEMeNt.

Lens

The lens has to be sufficiently wide angled and luminous - conditions so far best met by Tokina 3-8.2 mm F0.98 (IR).

A use of KPF 131HR camera

KPF 131HR camera is originally designed for building surveillance and thus requires several technical changes in order to make is suitable for usage.

IR filter removal from CCD chip

The most essential change of the camera is the removal of the IR cut filter. Proceed as follows:

CCD chip un-mouting CCD chip light sealing removing IR cut filter on chip IR cut filter removing Removed IR filter Returning the light seal

LED disconnecting

At the back of the camera you find a continuously shining LED, that might cause reflections from the front cover glass at night. It is therefore recommended to disconnect it during the IR filter removal.

Unsoldering the resistance powering the LED

Camera settings

PRC correction? Dark frame?

Before usage the camera has to be set as follows:

  • exposition 1/50 s
  • aperture control DC
  • BW regime
  • AGC to middle
  • brightness ca. 75

ImagingSource camera

The manual uses DFK 72AUC02 camera.

How to make the camera work in Ubuntu

upgrade of the camera firmware was done according to instructions with 2 exceptions:

  1. sudo ./euvccam-fw -u ../../data/firmware/usb2/dmk72uc02_129.euvc

Now it is possible to see the camera in /dev/video0

2. Further it is necessary to install ucview exactly according to instructions and then to install libunicapgtk2 from Ubuntu repository.

sudo apt-get install git autoconf libtool libgettextpo0 gettext gtk-doc-tools libraw1394-dev libpango1.0-dev libgstreamer0.10-dev libxv-dev  libgtk2.0-dev libgconf2-dev libglade2-dev libglade2.0 libglademm-2.4-dev libgstreamer-ocaml-dev libgstreamer-plugins-base0.10-dev

git clone https://github.com/unicap/unicap.git ; cd unicap
cd libunicap
./autogen.sh ; ./configure ; make ; sudo make install
cd ../libucil
./autogen.sh ;  ./configure; make; sudo make install
cd ../libunicapgtk/
./autogen.sh ;  ./configure; make; sudo make install

Compile the ucview.

git clone https://github.com/kaklik/ucview ; cd ucview/trunk
cd ucview
./autogen.sh;  ./configure; make; sudo make install
cd ../ucview-plugins/
./autogen.sh; ./configure; make; sudo make install
make; sudo make install

To test if everything got compiled fine run

ucview

Note: On some system you may need root privileges while running ucview to get your camera working.

Issues with the currently used cameras

  • Signal transmission is not possible over longer distances (in orders of meters). This means that computer has to be very close to the cameras usually under often problematic weather conditions.
  • Small angular resolution of camera
  • Small dynamic range

TODO

  • Software for synthesized all sky camera.

Protection of camera

Camera placed in a way that it has a direct view to the ecliptic has to be protected against direct sunshine that may damage the CCD chip.

It is customary to use a timer, that would close a camera shutter during a day by means of cutting off the power source. time protection of camera from the direct sunlight

This method is not very advantageous because of the additional timer, that could be replaced by the station's computer. Moreover, the situation could be addressed using the same method as in MRAKOMĚRu4.

Software

MetRec

MetRec is a freeware software that uses its own Matrox Meteor II card (has to be purchased) to grab the signal.

UFOCapture

UFOCapture is a proprietary software for Windows. It works with any grabbing hardware.

AZcendant

Visual observer

The drawbacks of the currently used programmes for automatic detection of meteor trails could be addressed by a new OpenSource software. It is so far still just a concept - comments are found here: Redmine.

A final version of detection software should use an OPSA01A based camera as an visual data input.

The synthesis of all-sky image

All-sky camera system (composed of more cameras) directly plots a coordinate system to the captured image depending on the current time. At the same time it is possible to use an automatic detection of key objects found in the image.

Data usage

Bolidozor

Bolidozor network can make use of the observed data to detect and further search for the bolides.

Meteorology

Because station's cameras should be directed in a way that they cover the whole sky, the data can be theoretically used for meteorological applications. Cloud cover observed at small distances from below can provide useful information concerning the occurrence of updrafts, storm parameters or moving of fronts.

Using photometry we can measure the height of cloud base, its thickness or the extent of the cloud cover.

Other useful output may be the measure of the concentration of dust and aerosols in the atmosphere.

3D image reconstruction

References

en/vmds.txt · Last modified: 2017/01/07 10:28 (external edit)