For a particular industrial application, a special microwave sensor has been invented and patented. Its use is foreseen when it is necessary to count the number of sheets of paper within a specific volume. It is used to check the number of sheets taken from a pile so as to know with certainty, for example, how many will end up in an envelope. The following diagram shows how it can be used.
![Schema di montaggio](https://www.tspelettronica.com/wp/wp-content/uploads/2019/05/SchemaMontaggio-1024x576.png)
The system is composed of:
- an electronic unit that generates and emits a microwave RF signal and subsequently carries out the measurement of its power after it has interacted with the material;
- a cavity within which the measuring material is placed;
- connection cables for the RF signal.
![SNA v1.2](https://www.tspelettronica.com/wp/wp-content/uploads/2019/05/20121017_095238-1024x768.jpg)
The measurement takes place in a very short time (<1 ms) and in contactless mode: the material is not altered at all.
![Sensors and paper](https://www.tspelettronica.com/wp/wp-content/uploads/2019/05/20121017_094722-1024x768.jpg)
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