RU83642U1 - PROXIMITY SENSOR FOR TWO SUBJECTS BASED ON RADIO FREQUENCY TAGS - Google Patents

Abstract

A proximity sensor containing at least one RF tag having a switch in its electrical circuit whose contacts are triggered by an external magnetic field.

Description

FIELD OF THE INVENTION

The present invention relates to radio frequency identification and can be applied in various fields of national economy.

State of the art

Currently, various radio frequency identification technologies are known. A description of the technologies can be found, for example, on the website http://rfid-news.ru/02 tech root.htm.

SUMMARY OF THE INVENTION

The present invention is the development of means of controlling the proximity of two objects based on radio frequency tags, which remotely allows you to judge the proximity of two objects.

To achieve this technical result, a method for controlling the proximity of two objects based on RF tags is proposed, which consists in equipping one of the objects with an proximity sensor with an RF tag that changes its response signal, perceived by the RF reader, when approaching or removing two objects between them by a distance determined by the design of the sensor; correlate the identifier of the RF tag in the memory of the hardware and software complex with the object on which it is installed; read the identifier of the RF tag using a radio frequency reader with a certain time interval; on the basis of a change in the response signal from the RF tag, a decision is made on the proximity of two objects.

A change in the response signal from the RF tag can be expressed by the ability or inability to read the identifier of the RF tag using a radio frequency reader, the change can occur due to interference caused by the approach of the RF tag to the metal or due to a metal screen mounted on one of two objects that is not equipped with a sensor RFID proximity.

In another embodiment, the RF tag in its circuitry has a switch, while depending on the position of the switch, the RF tag transmits different information in the response signal. The switch can be a button or a reed switch.

For convenience, an object equipped with a proximity sensor or proximity sensor is provided with an additional radio-frequency tag, the radiation of which does not depend on the distance between two objects.

To achieve the same technical result, a proximity sensor is also proposed containing at least one radio frequency tag having a switch in its electrical circuit whose contacts are triggered by an external magnetic field.

DETAILED DESCRIPTION OF THE INVENTION

The method of the present invention can be implemented in several similar ways, which, however, are implemented in the same system. One of the items, for example, an exhibition sample of a cell phone, is equipped with a sensor with a standard radio frequency (RFID) tag attached to the battery compartment of the phone. The reader reads the tag identifier and transfers it to the hardware-software complex (for example, a PC with the appropriate software

collateral) with which this particular tag is associated with a particular telephone. As soon as a cell phone is placed with a radio frequency tag on a second object, for example, a shelf of an exhibition stand, covered with foil or metal, due to interference from a metal surface, the reader will not be able to read the identifier of the radio frequency tag. Therefore, from now on, the reader does not transmit a tag identifier to the firmware. We can conclude that the phone is installed (close located, in contact) with the shelf of the exhibition stand. In fact, this means that the phone is armed. As soon as the phone is removed from the shelf, the reader will detect the appearance of the tag and transmit its identifier to the hardware-software complex, which, based on the occurrence of radiation from the tag, decides that the phone is removed from the shelf of the exhibition stand.

In the example described above, the telephone may be equipped with a second radio frequency tag, which is affixed to the telephone from the keyboard side. In this case, the second mark will not be shielded by the foil of the shelf of the exhibition stand, and will always be “visible” to the reader. By correlating the two labels in the firmware, it can be concluded that if the first label is unavailable and the second is available, the phone really lies on the exhibition table, and is not outside the sensitivity of the reader.

In order not to cover the entire surface of the shelf of the exhibition stand with foil, it is enough to make a small sticker made of foil in the place of the telephone.

The first RF tag of the above may have a more complex structure. For example, have a mechanical switch that opens the connection between the transponder chip and the oscillatory

contour. This switch can be implemented as a button that works under the weight of the same phone, or be a reed switch. In the latter case, a permanent magnet can be placed under the exhibition shelf.

In another embodiment, the mechanical switch may be flip. And depending on its position, the label will transmit two different identifiers. Based on which identifier is transmitted, the hardware-software complex makes a decision on the proximity of two objects.

Claims (1)

A proximity sensor containing at least one RF tag having a switch in its electrical circuit whose contacts are triggered by an external magnetic field.