ScribbleLive

@rob - er pool of what exactly?

@hudebnik Sea water. And Corium.

If fuel is in fact leaking through into areas like this, how will they stop the whole issue with hydrogen buildup?

AlJazeera picked it up :
Tepco confirms extra reactor meltdowns: Operator of Fukushima Daiichi plant says fuel rods at three of the plant... aje.me

OK chaps taking a coffee and eye break for a while. If you get a chance to look at the flash stuff on the wiki I'd be very interested in your thoughts. See you later.

However, there are several reasons why the containment overpressure may not be available. The accident scenario outlined above involves a pipe breaking inside containment. The energy released from that broken pipe pressurizes the drywell first and very quickly thereafter heats up the suppression pool water. Assuming no other complications, containment overpressure is virtually guaranteed because its arrival precedes that of the warmed suppression pool water.

Other possible accident scenarios yield different outcomes. One such scenario involves a stuck-open relief valve—a very real part of the very real meltdown at the Three Mile Island nuclear plant. When a safety/relief valve opens, energy "bypasses" the drywell to flow directly through the vent system into the suppression pool water in the wetwell. The suppression pool water gets heated before the drywell gets pressurized. Containment overpressure is definitely not guaranteed for this scenario.
www.ucsusa.org

Same thing, different URL: atmc.jp

It certainly looks as if something happened. TBS camera a nice blue tonight rather than pink.

Corium burp?

ANyone know what the rad level in Sv would be in a working reactor?

@all - these are Tepco's latest figures for #1, and they show a 9-fold increase in radiation in the suppression chamber (right hand columns) www.tepco.co.jp Can anyone please translate an entry like 9.99E-01 Sv into a straightforward figure?

We missed the initial flash which was brighter and white.

Tippycam is probably a day/night camera using an IR cut filter. Various links below:

www.electronics123.com
IR cut filters are great for day time images, because the sunlight does not cause a pink hue in the image. However they do not work at night because it blocks out light from an IR light illuminator. The same it true in reverse, without a IR cut filter the night time images turn out very good but the daytime images have a pink discoloration. This cut switch allows the IR filter to be turned on and off. The IR Cut Switch filters out intensive light to create more beautiful and natural image color in either day or night.

dpfwiw.com
dpfwiw.com
Infrared (IR) basics for digital photographers

www.davidkennardphotography.com
More on the Fuji IS-Pro and infrared photography

www.moretonalarms.com
DAY/NIGHT CAMERAS
When selecting cameras for surveillance applications there is a third choice available. In addition to standard monochrome and colour there are ‘Day-Night’ cameras.
Day-Night cameras provide a colour picture when there is sufficient light to do so, normally during daylight hours. When light levels fall, the picture reverts to black and white, to take advantage of the inherently better sensitivity performance of monochrome cameras.
Monochrome cameras typically require approximately 1/10 of the amount of light to make a useable picture, compared with a good quality colour camera.
The switching from colour to monochrome at dusk, or from mono to colour at dawn can either be automatic, using the camera itself as a light level meter or it can be controlled via an external photocell or a contact from suitable telemetry equipment.
In order for colour cameras to reproduce colours accurately they are normally equipped with an infrared cut filter. This prevents infrared light getting onto the CCD imaging device.
Natural daylight is a mixture of both visible and infrared light. If a colour camera is exposed to infrared light, the image will be lighter than if it was producing it from the available visible light. Hence colours would appear whitened; red objects would appear pink. Grass, being reflective to infrared light, would appear a pale shade of green.
Not all Day/Night cameras are the same; there are three distinct types.
One does not have an infrared cut filter fitted. Digital or other signal processing is used to compensate and make colours look correct when in day mode. This type of camera has good sensitivity at night and can be used with infrared lighting.
A second choice of Day/Night camera comes fitted with an infrared filter. This gives good colour rendition in daylight, however the camera is not as sensitive as a monochrome camera. The camera is not as sensitive to infrared and cannot be used with infrared illumination. If lighting is required, which is likely given the cameras reduced sensitivity; only visible lighting can be used.
Clearly, it would be appropriate if the infrared filter was in the optical path during daylight to give good colour rendition. It would also be best if there was no filter in place at night so that the camera is as sensitive as a normal monochrome camera, therefore it would be sensitive to infrared light, enabling overt or semi-covert surveillance.
Finally, there are Day-Night cameras, for instance the VCP501 Zoom camera from Videcon, which physically move an infrared cut filter in and out of the optical path to give true colour rendition in daylight, and low light and infrared sensitivity at night.
Because of there different wavelengths, infrared and visible light focuses at different points behind the lens. It is often a problem achieving a sharp image in both day and night modes. When using a standard auto-iris lens on a Day-Night camera, always perform the back focussing at the lowest light levels when depth of field is at a minimum.
The Concept Pro VCP501 is equipped with an auto-focus lens and will automatically give as sharp an image as is possible with which ever type of light is being used, visible or infrared.

www.axis.com
Day & Night network cameras
A day and night, color network camera delivers color images during the day. As light diminishes below a certain level, the camera can automatically switch to night mode to make use of near infrared (IR) light to deliver high-quality, black and white images.
Near-infrared light, which spans from 700 nanometers (nm) up to about 1000 nm, is beyond what the human eye can see, but most camera sensors can detect it and make use of it. During the day, a day and night camera uses an IR-cut filter. IR light is filtered out so that it does not distort the colors of images as the human eye sees them. When the camera is in night (black and white) mode, the IR-cut filter is removed, allowing the camera’s light sensitivity to reach down to 0.001 lux or lower.

www.astro-imaging.de
UV/IR cut filter
Atmospheric Dispersion
An UV/IR-cut filter helps removing the effects of atmospheric refraction / atmospheric dispersion in CCD-imaging. The direction of light as it passes through the atmosphere is changed because of refraction, the direction of refraction is that a sky object apparently moves towards the zenith. The amount of this apparent movement is wavelength dependent, the shorter the wavelength of light the greater the resulting movement so every object actually appears as a little spectrum with the blue end towards the zenith. This effect is called atmospheric dispersion.
CCD RGB Filter Matrix
If we image a sky object with a color CCD cam we usually record Red Green and Blue channels. The color CCD features a filter matrix with R, G and B filters for each pixel to record R;G and B for each final pixel separately (in fact the ICX098BQ CCD of a ToUcam pro has a Bayer filter matrix but we can live with the simple RGB model here...). The R filter lets only red light pass, the G filter green light and the B blue light. Unfortunately the RGB filters let also infrared light pass. Near infrared light and blue light reside on "opposite sides" of the visible light spectrum so they will be moved quite noticiable from each other by atmospheric dispersion. The B sensor of the CCD will record blue light and the shifted near infrared light resulting in an unsharp muddy blue channel or ghost images in the blue channel at worst. The same applies to the green channel with a smaller shift between near IR and green.
Solution
The solution for this problem is an IR-cut filter to block (near) infrared light. The standard lens of a ToUcam has an IR-cut filterfoil on the backlens. If we use the cam in primefocus of a scope we have to use a separate filter like the UV/IR-cut filter from Baader:

www.accuteoptical.com
Optical Filters>IR Blocking Filter(IR cut coating,reflective type)

www.webcamstore.com
The AXIS 232D+ Network Dome Camera is a day/night camera designed for outdoor surveillance and remote monitoring applications. The 232D+ provides 24 hour, high quality Motion JPEG and MPEG-4 video, with pan/tilt/zoom control over IP networks. It features an 18x optical zoom, autofocus lens and a removable IR-cut filter.

normal!

ah yes, fukushima back on top of the news in germany ! congratulations !

Hi @edano