RFID tag for ravioli
Hello honorable ladies and gentlemen. Try to guess what is presented in the photo.
This is not an art installation in the style of medical techno. This is a workable, useful RFID device, described below.
In fact, the picture shows the world's cheapest RFID temperature sensor (prototype, of course). Disposable syringe filled with water. Through the serial RFID inlay (RFID tag), a tensioned rope is threaded. When the water in the syringe freezes, it expands, the syringe plunger pulls on the string even more, and the rope cuts the RFID tag. Accordingly, before the water was frozen, the RFID tag is read by the RFID reader, and after freezing the RFID tag can no longer be read (perhaps never). Thus, a standard RFID reader can remotely and quickly determine whether the lower limit of the object's storage temperature range has been violated.
With a similar, but slightly more complex device, you can track the transition through the upper limit of a certain temperature range. The prototype looks the same as in the photo above. Only inside the syringe is soda powder, citric acid powder and another small syringe filled to the water. When the object is stored in the desired temperature range, the water in the small syringe freezes, expands and completely pushes the piston of the small syringe. And inside the big syringe there is a piece of ice protruding from a small syringe. The shape of the large syringe remains the same. But as the temperature rises, the ice begins to melt. Melt water dissolves soda and citric acid, which immediately enter into a chemical reaction, emitting carbon dioxide. The gas acts on the piston of an external large syringe, and the RFID tag is disabled by cutting the antenna with a string. Accordingly, such a label will be read remotely until the upper storage temperature range of the object is exceeded.
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The benefits of this may be, for example, this: when you receive hundreds of boxes of dumplings, you can determine in a minute which of them were unfrozen during transport.
It is clear that by adding sodium chloride or C2H5OH to water, you can precisely set the freezing limit of water at temperatures below zero Celsius. But it would be good to learn how to freeze a small amount of water at a temperature above zero. You can, of course, use heavy (deuterium) water, but this method is purely theoretical because of its high cost. English-language Google claims that the freezing point of water increases testosterone and long chain alcohol. I myself have never been a chemist, so I ask for help from readers: is this fact truthful in principle, and how many degrees can you raise the freezing point. Can anyone know?
This is not an art installation in the style of medical techno. This is a workable, useful RFID device, described below.
In fact, the picture shows the world's cheapest RFID temperature sensor (prototype, of course). Disposable syringe filled with water. Through the serial RFID inlay (RFID tag), a tensioned rope is threaded. When the water in the syringe freezes, it expands, the syringe plunger pulls on the string even more, and the rope cuts the RFID tag. Accordingly, before the water was frozen, the RFID tag is read by the RFID reader, and after freezing the RFID tag can no longer be read (perhaps never). Thus, a standard RFID reader can remotely and quickly determine whether the lower limit of the object's storage temperature range has been violated.
With a similar, but slightly more complex device, you can track the transition through the upper limit of a certain temperature range. The prototype looks the same as in the photo above. Only inside the syringe is soda powder, citric acid powder and another small syringe filled to the water. When the object is stored in the desired temperature range, the water in the small syringe freezes, expands and completely pushes the piston of the small syringe. And inside the big syringe there is a piece of ice protruding from a small syringe. The shape of the large syringe remains the same. But as the temperature rises, the ice begins to melt. Melt water dissolves soda and citric acid, which immediately enter into a chemical reaction, emitting carbon dioxide. The gas acts on the piston of an external large syringe, and the RFID tag is disabled by cutting the antenna with a string. Accordingly, such a label will be read remotely until the upper storage temperature range of the object is exceeded.
')
The benefits of this may be, for example, this: when you receive hundreds of boxes of dumplings, you can determine in a minute which of them were unfrozen during transport.
It is clear that by adding sodium chloride or C2H5OH to water, you can precisely set the freezing limit of water at temperatures below zero Celsius. But it would be good to learn how to freeze a small amount of water at a temperature above zero. You can, of course, use heavy (deuterium) water, but this method is purely theoretical because of its high cost. English-language Google claims that the freezing point of water increases testosterone and long chain alcohol. I myself have never been a chemist, so I ask for help from readers: is this fact truthful in principle, and how many degrees can you raise the freezing point. Can anyone know?
Source: https://habr.com/ru/post/189208/
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