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The construction of the 14,000-ton NOvA neutrino detector in Minnesota was completed in 2014 - on time and under budget. The experiment will allow scientists to study neutrino oscillations with the goal of determining the mass hierarchy of the three known types of neutrinos.
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This sweet labradoodle was on the boat of our Dolphin Exploration Expedition. He always knew where the dolphins were going to pop up
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More fun stuff from work. These are most of the internals of the detector rendered in "Cryogenic Detector Outside". The detector itself is pretty much buried under other crud.
The big orange cone is the bottom half of the cold finger assembly. (It will be made of OFHC copper, hence the orange color.) The upper half is bolted to the cryogenic cooler itself. In order to disassemble the camera, the cooler assembly is unbolted and removed. The only connection to the cooler assembly is this two piece cone system. This helps the cooler center on the cold finger assembly, and assures good thermal contact. The mating halves of the cone assembly are manufactured at the same time, and are then lapped together to ensure good contact.
Most of the thermal isolation is visible. The three vertical tabs are G10 phenolic, which provide the thermal isolation between the cold bits of the camera and the warm bits. The arrangement is also quite stiff, so things shouldn't move around much.
The two horizontal tabs (which are not quite the same shape, unfortunately) don't really offer thermal isolation. They're big springs whose job is to hold the cold finger assembly against the back of the detector.
Internal renderings of a cryogenically cooled CCD detector showing components of the cold finger assembly..
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Metal detector sounds: Showing the difference between a quarter on the surface and mixed signal object at 6 inches deep.
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The Hand of Faith resides at the Golden Nugget casino in Las Vegas, it is the largest gold nugget in existence in the world today.
It remains the largest gold nugget found with a metal detector.
Weight: 27.27 kg/875 Troy ozs
Size: 47cm long by 20cm wide by 20cm thick
The nugget was found by Kevin Hillier on September 16th, 1980 behind the old school in Kingower, central Victoria in Australia.
The circuitry of the BRK769AC smoke alarm. This alarm cannot
be interconnected to other alarms. The green wire is just a ground.
A park employee looking for metal in Parc Jeanne-Mance. I suppose he was looking for needles and such, instead of looking for silver.
With no small particles in the air, the IR beam goes straight into the wall of the housing. The wall is black and absorbs a great deal of the radiation. The little fins might be angled in such a way that the reflected radiation bounces around many times, which further attenuates it. Ideally nothing ever hits the sensor. The main purpose of this construction is to allow smoke-carrying air penetrate the walls, but keep ambient light out.
When tiny smoke particles are present in the center of the sensor, they scatter some of the IR light towards the sensor. You hear a very load beep.
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