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The little disposable battery testers that you simply see on batteries or battery packages are a great example of combined technologies -- several existing technologies are combined in a new kind of way! Battery testers count on two special types in ink: thermochromic and conductive inks. Thermochromic ink changes color determined by its temperature. Conductive printer ink can conduct electricity. By applying layers of these special inks in addition to a layer of normal ink having a fairly normal printing hit, it is possible to bring about an extremely inexpensive reproduced design that changes depending on the amount of electricity it all receives.
There are two kinds of thermochromic ink: liquid very and leucodye. Liquid crystal based thermochromic printer is sensitive to small changes in temperature, nevertheless it is fairly difficult towards manufacture. This makes it perfect for use in items like thermometers where you will want the sensitivity, but troublesome in an item which needs to be inexpensive and in which an enormous, abrupt change in heat range will occur. Leucodyes are specially formulated substances that vary from a specific color, similar to blue, to a clear state when subjected to a temperature change of around 5 degrees F or over. Thermochromic inks can be formulated to alter color at specific temperature. For battery testers, the required temperature is usually near 100-120 degrees F.
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To make a battery tester, you commence with a layer of conductive printer that gets progressively narrower while you move across the tester as a result of "good" to "bad. " Inside picture above the tester seems to have 3 bars. In additional testers the ink is certainly wedge-shaped. The narrowest stage indicates the weakest request; the widest area indicates an entire charge. When current passes over the thin layer of conductive printer, resistance in the printer creates heat. A small amount of current can generate plenty of heat to affect the smallest area of thermochromic printer; but, as the space widens, more current is necessary to change colors.
On top of the conductive ink is your layer of normal ink that conveys the structure. In most battery testers, this is some sort of "fuel gauge" graphic and text that indicates that a battery is good. The planning can be anything, since the normal printer layer does not affect what sort of conductive and thermochromic levels interact.
Finally, there may be the thermochromic layer. In the photo from the battery tester above, your thermochromic layer is black color when cool. By touching a battery on the conductive ink on the back of the paper, an association between the positive and negative terminals is created. As a current might be generated, the thermochromic ink will turn clear. This reveals the planning that is printed around normal ink. If there's enough current, most or each of the thermochromic ink will heat towards the temperature needed to acquire translucent.
One question you could have right now is, "Doesn't the battery tester drain many of the battery's energy? " The result is, "yes, but insufficient to matter. " If you researched the battery every 5 minutes it is a problem, but most of the people don't do that.
One sort of battery tester available now has the tester right on the particular battery. You press two small dots indicated for the battery to test that. These points complete a circuit relating to the battery and the tester, and electricity flows with the conductive ink just like as in the tester reviewed above. <! --INFOLINKS_OFF-->.
Sat Sep 17, 2011 5:34 pm