NO20201347A1 - Cabinet with signal transmission assembly - Google Patents
Cabinet with signal transmission assembly Download PDFInfo
- Publication number
- NO20201347A1 NO20201347A1 NO20201347A NO20201347A NO20201347A1 NO 20201347 A1 NO20201347 A1 NO 20201347A1 NO 20201347 A NO20201347 A NO 20201347A NO 20201347 A NO20201347 A NO 20201347A NO 20201347 A1 NO20201347 A1 NO 20201347A1
- Authority
- NO
- Norway
- Prior art keywords
- signal transmission
- cabinet
- sensor
- antenna
- transmission assembly
- Prior art date
Links
- 230000008054 signal transmission Effects 0.000 title claims description 58
- 230000005540 biological transmission Effects 0.000 claims description 37
- 239000002184 metal Substances 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000005534 acoustic noise Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0247—Electrical details of casings, e.g. terminals, passages for cables or wiring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/145—Passive relay systems
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0049—Casings being metallic containers
Description
CABINET WITH SIGNAL TRANSMISSION ASSEMBLY
Technical Field
The present invention relates to parameter sensing inside cabinets, typically used in EX-environments.
Background Art
In various facilities, such as offshore platforms, hydrocarbon refineries, and elsewhere, various types of sensors are arranged to monitor different parameters. Such parameters can typically include temperature, gas amounts, humidity, acoustic noise, and vibration. In recent years, small sensors that communicate the measured values with a wireless link have become popular. Such sensors can typically be adhered onto relevant equipment and the wirelessly communicated measurement data is collected by a receiving unit.
In some applications, it is desirable to apply such sensors inside cabinets that are made of metal. The wireless transmission of data then becomes cumbersome, since the cabinet walls function as a Faraday cage.
The object of the present invention is to provide a solution to this problem.
Summary of invention
According to a first aspect of the present invention, there is provided a cabinet having metal walls that enclose an inner volume of less than 1 m3. The cabinet encloses a sensor that comprises a wireless transmission unit with a sensor antenna. The wireless transmission unit is configured to transmit measured values. The cabinet further comprises a signal transmission assembly. The signal transmission assembly comprises a listening antenna located inside the cabinet, an external transmission antenna arranged external of the cabinet, and a signal transmission guide extending between the listening antenna and the external transmission antenna. The signal transmission guide extends through one of said metal walls.
With the term metal walls is meant a barrier of metal that obstruct radio signals of from an antenna inside the cabinet to exit the cabinet. Such a barrier can for instance be a metal plate, metal foil, or a metal lattice.
The said cabinet will typically entirely enclose the said inner volume, meaning that it prevents radio waves from exiting the cabinet.
In some embodiments, the cabinet can further enclose a conductor that conducts electric current.
The signal transmission guide can typically be a cable. However, in some embodiments it may be a rigid piece of signal guide.
The sensor may in some embodiments be a temperature sensor, configured to measure temperature values and transmit the measured temperature values. However, other types of sensors are possible, for instance vibration sensors, humidity sensors or gas sensors.
In some embodiments, the signal transmission assembly may further comprise a sensor socket that comprises a sensor-receiving surface and the listening antenna.
In such embodiments, that the signal transmission assembly may have a plurality of sensor sockets, wherein the sensor sockets connect to the external transmission antenna through respective intermediate cables, and wherein the sensor sockets are located at different locations inside the cabinet.
Advantageously, the intermediate cables connect to said signal transmission guide, typically a signal transmission cable, at a junction.
The sensor-receiving surface can advantageously be arranged in a recess.
In some embodiments, the signal transmission assembly can further comprise an electric bushing connected to the signal transmission guide, between the listening antenna and the external transmission antenna.
According to a second aspect of the present invention, there is provided a signal transmission assembly that comprises an external transmission antenna and a signal transmission guide formed as a signal transmission cable. The signal transmission guide connects to the external transmission antenna. The signal transmission assembly further comprises a sensor socket comprising a listening antenna and a sensor-receiving surface.
In some embodiments, the signal transmission assembly can comprise a plurality of sensor sockets connected to the external transmission antenna through intermediate cables.
The sensor socket may in some embodiments comprise a recess.
Detailed description of the invention
While the present invention has been discussed in general terms above, a more detailed and non-limiting example of embodiment will be given in the following with reference to the drawings, in which
Fig. 1 is a schematic perspective view of a wireless temperature sensor;
Fig. 2 is a schematic perspective view of a junction cabinet with a temperature sensor inside;
Fig. 3 is a perspective view of a sensor socket;
Fig. 4 is a diagrammic view of a signal transmission assembly;
Fig. 5 is a diagrammic perspective view of a junction cabinet with a signal transmission assembly;
Fig. 6 is a diagrammic view of another signal transmission assembly;
Fig. 7 is another view of a junction cabinet with a signal transmission assembly;
and
Fig. 8 is a diagrammic view of a yet another signal transmission assembly.
Fig. 1 shows a temperature sensor 1 equipped with a wireless transmission unit 1a. Measured temperature values can thus be communicated to a receiver antenna with the wireless transmission unit 1a. Wireless transmission is well known and will not be elaborated herein.
The temperature sensor 1 can have a shape like a rectangular chip measuring for instance about 2 x 2 cm. Due to its small size it can be used in many different places where temperature monitoring is useful.
Fig. 2 depicts a junction cabinet 3 where a temperature sensor 1 is arranged.
The junction cabinet 3 has metal walls 5, including a back wall, two side walls, an upper wall and a lower wall. Furthermore, the junction cabinet 3 has a further metal wall in the form of a metal cover 7 that is connected to the junction cabinet 3 with hinges (not shown). The metal cover 7 can be closed and opened, as is common for a junction cabinet.
An electric conductor 9 extends through one metal wall 5, from the external side to the internal side of the junction cabinet 3.
Inside the junction cabinet 3 there are various electric equipment 11, such as fuses or switches. Electric equipment 11 can produce excessive heat when malfunctioning. Hence, the temperature sensor 1 can be used for temperature monitoring inside the junction cabinet 3.
However, as is known to the skilled person, the metal walls 5 and the metal cover 7 of the junction cabinet 3 will function as a Faraday cage. Because of this, the radio signals transmitted by the wireless transmission unit 1a may not be readable outside the junction cabinet 3.
A possible solution to this problem could be to use a wired temperature sensor instead of the shown wireless sensor 1. However, for hazardous environments, extending an electric wire through the metal walls and contacting it electrically directly to the sensor, may represent a hazard.
Fig. 3 depicts a sensor socket 13. The sensor socket 13 is configured to receive a wireless sensor, such as the wireless temperature sensor 1 shown in Fig.1 and Fig.2.
The sensor socket 13 is also shown in Fig.4. Fig.4 depicts a signal transmission assembly 10. The sensor socket 13 is part of the signal transmission assembly 10.
Furthermore, the sensor socket 13 comprises a sensor-receiving surface 15. In the shown embodiment, the sensor-receiving surface 15 is arranged in a recess 17 in the sensor socket 13.
The sensor 1 can for instance be attached to the sensor-receiving surface 15 with an adhesive or with a double-sided tape. In embodiments where the sensor socket 13 is not used, the sensor 1 can be attached directly onto the item that shall be measured, also typically with an adhesive or double-sided tape.
The sensor socket 13 also comprises a listening antenna 19. The mutual positions of the listening antenna 19 and the sensor-receiving surface 15 is such that radio waves from the wireless transmission unit 1a are transmitted directly onto the listening antenna 19.
Notably though, there is a distance between the listening antenna 19 and the wireless transmission unit 1a of the sensor 1. Furthermore, there is no direct electric connection between the wireless transmission unit 1a and the listening antenna 19. As will be understood by the skilled person, the wireless transmission unit 1a of the sensor 1 comprises a sensor antenna (not shown).
A signal transmission guide, here in the form of a signal transmission cable 21, connects to the listening antenna 19. Thus, signals emitted from the wireless transmission unit 1a of the sensor 1 is received by the listening antenna 19 and conveyed through the signal transmission cable 21.
The signal transmission cable 21 connects, with its opposite end, to an external transmission antenna 23.
In the shown embodiment, there is further provided an electric bushing 25 between the sensor socket 13 and the external transmission antenna 23.
Fig. 5 depicts an embodiment where the signal transmission assembly 10 shown in Fig.4 is installed with the junction cabinet 3. The sensor socket 13 is attached to the back wall 5 of the cabinet 3. A wireless temperature sensor 1 is received by the sensor socket 13, such as shown in Fig.4. The external transmission antenna 23 is connected to the electric bushing 25, which connects to a through aperture in the side wall 5 of the junction cabinet 3.
Furthermore, corresponding to the embodiment shown in Fig.4, the signal transmission cable 21 extends between the sensor socket 13 and the external transmission antenna 23.
While it is considered advantageous to extend the signal transmission cable 21 through one of the fixed metal walls 5, one could instead extend the signal transmission cable 21 through the metal wall that is in form of the cover 7.
Radio signals emitted by the sensor antenna of the wireless transmission unit 1a are received by the listening antenna 19 and conveyed through the signal transmission cable 21 to the external transmission antenna 23, which is located outside of the junction cabinet 3. In this manner, one can use wireless sensors inside the cabinet 3, while still wirelessly receiving their output, even when the cabinet is made of metal forming a Faraday cage.
Fig. 6 depicts an embodiment of the signal transmission assembly 10 without the sensor socket 13 shown in Fig.3, Fig.4 and Fig.5. In this embodiment, the listening antenna 19 is configured to be arranged inside the cabinet 3, with a more random or optional mutual position between the listening antenna 19 and the one or more temperature sensors 1.
An application of the signal transmission assembly 10 shown in Fig.6 is illustrated in Fig.7. However, in the embodiment shown in Fig.7, the signal transmission guide 21 (not indicated in Fig.7) is not a signal transmission cable. Rather, it is merely a rigid signal guide arranged between the listening antanna 19 and the external transmission antenna 23.
In the embodiment shown in Fig.7, three temperature sensors 1 are placed at different positions within the cabinet 3. The listening antenna 19 is attached on the inner face of one of the metal side walls 5.
It will be appreciated that the signal strength emitted from the external transmission antenna 23 in the embodiment shown in Fig.6 and Fig.7, will be lower than the signal strength provided by using the sensor socket 13. This is because the sensor socket 13 will provide a better interception of the signals emitted from the wireless transmission unit 1a. Fig.8 depicts an embodiment of a signal transmission assembly 10 comprising a plurality of sensor sockets 13 that are connected to one common signal transmission antenna 23. The sensor sockets 13 are each connected to a common signal transmission cable 21 with respective intermediate cables 21a. The intermediate cables 21a connect to the signal transmission cable 21 in a junction 22.
It shall be clear that the cabinet 3 can be of different types. For instance, it can be a cabinet containing PLC units, a cabinet containing hazardous chemicals, a lighting fixture with a transparent enclosure and protective metal grating.
Claims (8)
1. A cabinet (3) having metal walls (5) that enclose an inner volume of less than 1 m<3>, wherein the cabinet encloses
- a sensor (1) comprising a wireless transmission unit (1a) with a sensor antenna, wherein the wireless transmission unit is configured to transmit measured values;
wherein the cabinet (3) further comprises a signal transmission assembly (10), the signal transmission assembly (10) comprising
- a listening antenna (19) located inside the cabinet (3);
- an external transmission antenna (23) arranged external of the cabinet (3); and
- a signal transmission guide (21) extending between the listening antenna (19) and the external transmission antenna (23), wherein the signal transmission guide (21) extends through one of said metal walls (5).
2. A cabinet (3) according to claim 1, characterized in that the signal transmission assembly (10) further comprises a sensor socket (13) that comprises
- a sensor-receiving surface (15);
- the listening antenna (19).
3. A cabinet (3) according to claim 2, characterized in that the signal transmission assembly (10) comprises a plurality of sensor sockets (13), wherein the sensor sockets (13) connect to the external transmission antenna (23) through respective intermediate cables (21a), and wherein the sensor sockets (13) are located at different locations inside the cabinet (3).
4. A cabinet (3) according to claim 2 or claim 3, characterized in that the sensor-receiving surface (15) is arranged in a recess (17).
5. A cabinet (3) according to one of the preceding claims, characterized in that the signal transmission assembly (10) further comprises an electric bushing (25) connected to the signal transmission guide (21), between the listening antenna (19) and the external transmission antenna (23).
6. A signal transmission assembly (10) comprising
- an external transmission antenna (23);
- a signal transmission guide (21) formed as a signal transmission cable, wherein the signal transmission guide (21) connects to the external transmission antenna (23);
characterized in that the signal transmission assembly (10) further comprises
- a sensor socket (13) comprising a listening antenna (19) and a sensorreceiving surface (15).
7. A signal transmission assembly according to claim 6, characterized in that it comprises a plurality of sensor sockets (13) connected to the external transmission antenna (23) through intermediate cables (21a).
8. A signal transmission assembly according to claim 6 or claim 7, characterized in that the sensor socket (13) comprises a recess (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20201347A NO346691B1 (en) | 2020-12-09 | 2020-12-09 | Cabinet with signal transmission assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20201347A NO346691B1 (en) | 2020-12-09 | 2020-12-09 | Cabinet with signal transmission assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO20201347A1 true NO20201347A1 (en) | 2022-06-10 |
| NO346691B1 NO346691B1 (en) | 2022-11-28 |
Family
ID=82399220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20201347A NO346691B1 (en) | 2020-12-09 | 2020-12-09 | Cabinet with signal transmission assembly |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO346691B1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08331028A (en) * | 1995-06-02 | 1996-12-13 | Ichikoh Ind Ltd | Antenna system |
| JPH11163773A (en) * | 1997-11-25 | 1999-06-18 | Hitachi Electron Service Co Ltd | In-building non-power supply radio repeater |
| US20020119748A1 (en) * | 1999-06-24 | 2002-08-29 | Eldon A. Prax | Method and apparatus for providing a passive cellular telephone repeater |
| WO2009119739A1 (en) * | 2008-03-28 | 2009-10-01 | マスプロ電工株式会社 | Passive antenna system for relay |
| CN208422088U (en) * | 2018-07-12 | 2019-01-22 | 南京天谷能源工程有限公司 | A kind of ammeter wireless communication control device |
| CN210381585U (en) * | 2019-07-01 | 2020-04-21 | 四川恒匀通科技有限公司 | Metal cabinet with built-in antenna |
-
2020
- 2020-12-09 NO NO20201347A patent/NO346691B1/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08331028A (en) * | 1995-06-02 | 1996-12-13 | Ichikoh Ind Ltd | Antenna system |
| JPH11163773A (en) * | 1997-11-25 | 1999-06-18 | Hitachi Electron Service Co Ltd | In-building non-power supply radio repeater |
| US20020119748A1 (en) * | 1999-06-24 | 2002-08-29 | Eldon A. Prax | Method and apparatus for providing a passive cellular telephone repeater |
| WO2009119739A1 (en) * | 2008-03-28 | 2009-10-01 | マスプロ電工株式会社 | Passive antenna system for relay |
| CN208422088U (en) * | 2018-07-12 | 2019-01-22 | 南京天谷能源工程有限公司 | A kind of ammeter wireless communication control device |
| CN210381585U (en) * | 2019-07-01 | 2020-04-21 | 四川恒匀通科技有限公司 | Metal cabinet with built-in antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| NO346691B1 (en) | 2022-11-28 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MM1K | Lapsed by not paying the annual fees |