first results from the biocams j. brunner. cameras on floor 1 and floor 5 together with an om and an...
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![Page 1: First results from the Biocams J. Brunner. Cameras on floor 1 and floor 5 together with an OM and an ADCP Floor 1 –80m above sea floor Floor 5 –270m above](https://reader036.vdocuments.site/reader036/viewer/2022070418/5697bfa01a28abf838c95746/html5/thumbnails/1.jpg)
First results from the Biocams
J. Brunner
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• Cameras on floor 1 and floor 5 together with an OM and an ADCP
• Floor 1 – 80m above sea floor
• Floor 5– 270m above sea floor– ~floor 13 normal line
Installation on IL07
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Camera
AXIS221 vidéosurveillance
Night view capabilitiesView field up to 90 degreeSensitive into infraredView field & focus can be set manuallyDiaphragm & exposure time automatically / remotely controlled
Data outputEthernet
Power 12-24V, 5WControl of external device
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IR Source
Absorption in water less than 1m – no interference with PMTs on other lines
~60 LED 850nm
Can be controlled (switched ON/OFF) by camera
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Mechanics @ CPPM
Test setup for water testsFinal mechanics frame to hold cameraAnd IR source (not yet mounted)
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Mounting on OMF (floor 5)Try to maximize overlap of field of view between camera and OM
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Electronics from CPPM
CAMETH CAMPOW
Conversion of Ethernet signalsFrom electric to optic
Power supply and IR control
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Combined tests with ISIT
ISIT IR AXIS
ISIT : intensified silicon intensifier tubeUniversity Aberdeen 1995, 20,000 EuroClaimed sensitivity ~ 10-6 lux
Bacteria sample
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Combined tests with ISIT
Bacteria sample
AXIS
AXIS, IR ON
ISIT
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Tests with OM
Camera and IR source850 nm
Box for laser calibration
OM with PMT
Image taken with PMT HV onAnd IR onCounting rate PMT ~ 10 Mhz Second IR source 940nmTo avoid interference with PMTs
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Test with laser
laser
OMSplitter16x
Diffuser
Geometrical factor 0.1
Cameralens
100-1000 Hz
Integration variable
1cm2
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Test with laserAXIS 1sec AXIS 1/25sec ISIT 1/25 sec
3.10-5 lux
3.10-6 lux
ISIT ~ factor 20 more sensitive ; AXIS better resolutionMissing sensitivity can be compensated by longer exposure timeWorst case scenario : isotropic light (as from K40)PMT 1MHz = 108 photons/m2/sec = 3 10-8 luxExpect to see pointlike signals at few MHz depending on geometry
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Deployment July 2007
Floor 5Floor 1
ADCP Camera
OM
ADCP
Camera
OM
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Connection Dec 2007Floor 5Floor 1
ADCPCameraIR flash
OMOM Camera
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Data taking cameras
– Connected to Windows machine antbiocamdaq (IMP)– Run in self triggering mode (motion detection)– IR flash activated when triggered– Camera floor1 : large “excluded areas” to avoid self
triggering– Data saved on local disk– Triggered images manually copied to CPPM– Exposure time lowered from initially 2 secs to now 0.2
secs– Motion detection trigger tuned to maximize sensitivity
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Data taking cameras– Manual triggers possible via web interface by switching ON IR
flash for few secs– Manual triggers are recorded (exmaple below)
– 2008-01-02 19:47:05 +0100 "IR floor 1 manual"– 2008-01-06 22:19:04 +0100 "IR floor 1 manual"– 2008-01-06 22:21:07 +0100 "IR floor 1 manual"– 2008-01-10 21:06:56 +0100 "IR floor 1 manual"– 2008-01-10 21:21:36 +0100 "IR floor 1 manual"– 2008-01-14 19:13:21 +0100 "IR floor 1 manual"– 2008-01-14 19:13:52 +0100 "IR floor 1 manual"– 2008-01-14 22:10:24 +0100 "IR floor 1 manual“
– First result : IR light totally invisible to PMTs (orientation, water absorption ?) for both wave lengths
– Alternative DAQ mode • always active (store all images)• IR always ON
– Useful to study currents, “snow” density
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Data taking OMs & ADCPs
– Independent run control with customized clock, dfilter, dwriter
– Acou-clock provided by Max Neff to avoid interference with main run control
• (counter measure for clock broadcast commands)
– Data saved at Lyon as for normal runs• Only SummaryTimeslices written• Only ARS 0 read• 13msec Frametime • 20 hour runs : ~70 Mbytes per run
– Online monitoring : only 1 ratemon
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Run Control
All processes can run on a single machine (currently pollux)
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Examples of bursts
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Time distribution camera triggers
15 triggers from floor 51 trigger from floor 1No striking correlation with burst fraction
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Examples
2008-01-14 floor1 2007-12-30 floor5
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Examples
2007-12-24 floor5 2008-01-19 floor5
OM floor 5 not anymore operationalUnder investigation
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Examples
2007-12-10 floor5
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Status
• Both cameras + IR flashes work well
• Lost 1 OM
• IR 940nm to far infrared to be useful
• Self triggering of cameras works fine
• Independent running with OMs works fine
• Sensitivity sufficient to see bioluminescent events
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Future
• Continue data taking in self trigger mode• Develop external trigger (from OMs)• Improve self trigger for floor 1
– (trigger dead time, help needed from AXIS)• Try to resurrect OM floor 5• Analyze camera events (help needed)• Analyze L0 count rates (help needed)
– Burst shapes– Total charge seen by PMTs
• Possible data taking periods with light ON – to study sea currents– oscillations of lines– snow density