![]() ![]() Thus, the development of compact, portable, high sensitive battery powered TL reader would be of great utility for infield radiological radiation measurements applications using TL dosimetry. In most of the available commercial TL reader system consumes ∼120 Watt (AC mains electrical power to achieve desirable heating rate (0.1 K s −1–20 K s −1) and attending maximum temperature of ∼450 ☌. However, TL glow curve recording requires heating of a reasonable amount of the phosphors, hence needs a substantial thermal/electrical power. On the other side, most of the TL phosphors can be irradiated and handled in an ambience light. These constrain gives added advantage for the possibility of developing a portable OSL reader operating at low electrical power ∼2 Watt. This condition may impose some limitation for use the OSL dosimeters in field conditions under nuclear/radiological emergencies. However, the OSL dosimeters should be handled in dark condition during exposure storage and readouts. ![]() Thus, the OSL dosimetry offers advantage in terms of sensitivity, relative easy, fast and multiple readout choice. In OSL method, the optical stimulation results in release of the trapped charges from meta-stable defects and there subsequent recombination with charges of opposite polarities lead to luminescence signal. However, both these techniques are having their own advantages and disadvantage in terms of their use and methods of getting luminescence signals. Many decades of extensive research and development has made the phenomena of thermo-luminescence (TL) and optically stimulated luminescence (OSL) valuable investigating tool in various field of applications, like environment/personnel monitoring, geological/archeological dating, medical dosimetry, space dosimetry and more recently in nuclear forensic. The TL glow curve of α-Al 2O 3:C, CaSO 4:Dy, and LiCaAlF 6:Eu,Y (LCAF) phosphor were recorded using the developed heating assembly. This TL reader system works on four 1.2V, 2.8Ah, Ni-Mh re-chargeable batteries. The developed miniature heater assembly was installed in newly designed battery powered TL reader system. The formulated theoretical model matches well within the experimental findings under some assumptions made in generation of linear/non-linear and constant temperature heating profiles for a variable heating rate in the range of 0.1 K s −1 to 4 K s −1 with maximum temperature of 400 ☌. The heat generation rate equations have been formulated by considering the radiative and conduction losses. The theoretical modeling of the heating processes participating in the heater assembly has been evolved and substantiated with experimental evidential analysis. The construction and thermodynamics of this heater assembly has been described in detailed. In case you were just scanning this bit and didn’t catch my last comment: Be very careful, these things are not for messing about with.The miniature heater assembly has been developed for a compact portable battery powered thermo-luminescence (TL) reader system. ![]() Be very careful, these things are not for messing about with. I recommend Micah from, he has a book and lots of great videos. If you haven’t got any experience making lithium batteries you should do some research first. Lithium batteries can be extremely dangerous. This build involves making a Lithium battery from three 18650 cells. These things just aren’t very safe and have to be removed from the device for charging. We very strongly recommend against using Lithium polymer (LiPo) batteries as some guides suggest (the type used in drones and other R/C stuff). You will also need an enclosure (a case) of some kind and some wire (it’s a 12V 6A system, so something reasonably chunky, except for the button and LED, those bits are low power). If you don’t fancy getting down with the hot tin, then feel free to head over to our shop and pick one up ready baked. Having said that, lithium batteries can be very dangerous. We have created a wiring diagram to help you assemble the parts correctly as well as some other resources to help you on your way. This is a challenging but achievable build for someone with a good amount of maker knowledge who has a soldering iron and isn’t afraid to use it. We also sell full DIY kits with all the parts required and a wiring layout – just to make your build a little easier. These components are available in our shop. There are various how-to guides to actually make an induction heater out there already, just have a look around – and please ensure you know what you’re doing with this one! If you want to build your own 18650 battery powered induction heater, this is a list of parts you are going to need. ![]()
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