JP2002094288A - Electromagnetic shielding chamber-monitoring system - Google Patents
Electromagnetic shielding chamber-monitoring systemInfo
- Publication number
- JP2002094288A JP2002094288A JP2000280644A JP2000280644A JP2002094288A JP 2002094288 A JP2002094288 A JP 2002094288A JP 2000280644 A JP2000280644 A JP 2000280644A JP 2000280644 A JP2000280644 A JP 2000280644A JP 2002094288 A JP2002094288 A JP 2002094288A
- Authority
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- Japan
- Prior art keywords
- electromagnetic shield
- electromagnetic
- radio frequency
- receiving
- radio wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は電磁シールド室の
性能維持を図るための電磁シールド室監視システムに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield room monitoring system for maintaining the performance of an electromagnetic shield room.
【０００２】[0002]
【従来の技術】電磁シールド室は、その室内外の電磁環
境を遮断する目的のために使用されるものである。すな
わち、内部で発生した電磁波を外部に漏洩させないこ
と、また外部電磁環境が内部の機器に影響を及ぼさない
ようにするための施設である。従来の電磁シールド室の
用途は、いわゆる試験用であり、通信機器や空中線の試
験、あるいはＥＭＣ（電波雑音干渉）試験に供するもの
であった。このような試験を用途とする場合、通常その
使用者は電波技術分野の精通者であり、かつ試験環境か
らの要求として電磁シールド室内外の電磁環境遮断が必
要条件となっており、電磁シールド室の電磁シールド性
能は定期的に点検・保守が行われるため、常時はその性
能が維持されているものとして扱われてきた。またその
間に、もしも電磁シールド性能が低下した場合でも、そ
の性能低下による被害を被る側から訴えがあるので、常
時の監視は不可欠とはされていなかった。2. Description of the Related Art An electromagnetic shield room is used for the purpose of shielding an electromagnetic environment inside and outside the room. That is, it is a facility for preventing the electromagnetic waves generated inside from leaking to the outside and preventing the external electromagnetic environment from affecting the internal devices. The conventional electromagnetic shield room is used for a so-called test, and is used for a test of a communication device or an antenna or an EMC (radio wave noise interference) test. In the case of using such a test, the user is usually a savvy person in the radio wave technology field, and it is necessary to shut off the electromagnetic environment inside and outside the electromagnetic shield room as a requirement from the test environment. Because the electromagnetic shielding performance of the NGK is regularly inspected and maintained, it has been treated as if it always maintained its performance. In the meantime, even if the electromagnetic shielding performance deteriorates, there is a complaint from the side suffering from the deterioration of the performance, so that regular monitoring was not considered essential.
【０００３】近年になって電磁シールド室の用途は、上
述の試験用以外に一般事務所用としても多用されるよう
になってきた。その場合の電磁シールド室は、一般の事
務所で使用されているＯＡ機器の電波的防護を目的とし
たコンピュータセキュリティ対策として適用されるもの
である。その防護目的の具体例としては、ＯＡ機器に内
蔵される電子回路からの電磁波放射に伴う情報漏洩を防
止すること、およびＯＡ機器に内蔵される電子回路から
の電磁波放射に対する他の機器の誤動作を防護すること
が挙げられる。In recent years, the use of the electromagnetic shield room has been frequently used for general offices in addition to the above-mentioned test. The electromagnetic shield room in that case is applied as a computer security measure for the purpose of radio wave protection of OA equipment used in general offices. Specific examples of the protection purpose include preventing information leakage accompanying electromagnetic wave radiation from the electronic circuit built in the OA device, and preventing malfunction of other devices with respect to the electromagnetic wave radiation from the electronic circuit built in the OA device. Protection.
【０００４】[0004]
【発明が解決しようとする課題】このように事務所用と
しての用途では、その使用者が前述の試験用のように電
波技術分野の精通者ではないため、ややもすれば保守整
備において不備を来すことがある。また、外来からの電
磁波盗聴、電磁波妨害等に対処するために常時の性能監
視が必要となるが、従来はその要求を満たすべき有効な
手段が存在しなかった。このように、従来の事務所用の
電磁シールド室は、その性能を維持していくために課題
があった。As described above, in an office use, since the user is not a savvy person in the radio wave technical field as in the above-mentioned test, there is a possibility that the maintenance work will be incomplete. There is. In addition, it is necessary to constantly monitor performance in order to cope with eavesdropping of electromagnetic waves from the outside, electromagnetic interference, and the like, but there has been no effective means to satisfy the demands in the past. As described above, the conventional electromagnetic shielding room for offices has a problem in maintaining its performance.
【０００５】この発明は従来のような課題を解消するた
めになされたもので、電磁シールド室の性能が維持され
ているかどうかを常時監視し、性能低下時には警報を発
するなどして、性能を確認できる手段を持つ電磁シール
ド室監視システムを得ることを目的とする。[0005] The present invention has been made to solve the conventional problems, and constantly monitors whether or not the performance of the electromagnetically shielded room is maintained, and issues an alarm when the performance is degraded to confirm the performance. It is an object of the present invention to obtain an electromagnetic shielding room monitoring system having a means capable of performing the above.
【０００６】[0006]
【課題を解決するための手段】この発明に係る電磁シー
ルド室監視システムは、無線周波信号を発生する送信装
置と、導電体が施された電磁シールド面で空間を囲んで
形成された電磁シールド室の内部または外部の一方に設
置され入力された前記無線周波信号を電波にして送信す
る送信用空中線と、前記電磁シールド室の内部または外
部の他方に設置され前記電波を受信する受信用空中線
と、前記受信用空中線の受信電波から前記無線周波信号
の成分を表わす被監視信号を取り出す受信装置と、前記
被監視信号から前記受信用空中線の受信レベルを監視す
る監視装置とを備えたものである。An electromagnetic shield room monitoring system according to the present invention includes a transmitter for generating a radio frequency signal, and an electromagnetic shield room formed by surrounding a space with an electromagnetic shield surface provided with a conductor. A transmitting antenna installed in one of the inside or the outside and transmitting the inputted radio frequency signal as a radio wave, and a receiving antenna installed in the other of the inside or outside of the electromagnetic shield room and receiving the radio wave, A receiving device that extracts a monitored signal representing a component of the radio frequency signal from a received radio wave of the receiving antenna; and a monitoring device that monitors a reception level of the receiving antenna from the monitored signal.
【０００７】この発明に係る電磁シールド室監視システ
ムは、上記受信用空中線が電磁シールド室の複数の方向
の電磁シールド面に対して個別に複数設置され、受信装
置がそれぞれの前記受信用空中線が受信した電波から無
線周波信号の成分を表わす被監視信号を取り出す機能を
有し、監視装置が前記被監視信号からそれぞれの前記受
信用空中線の受信レベルを監視するものである。In the electromagnetic shield room monitoring system according to the present invention, a plurality of the above-mentioned receiving antennas are individually installed on the electromagnetic shielding surfaces in a plurality of directions of the electromagnetic shield room, and a receiving device receives each of the receiving antennas. A function of extracting a monitored signal representing a component of a radio frequency signal from the obtained radio wave, and a monitoring device monitoring the reception level of each of the receiving antennas from the monitored signal.
【０００８】この発明に係る電磁シールド室監視システ
ムは、導電体が施された電磁シールド面で空間を囲んで
形成された１個の電磁シールド室に対して、個別の周波
数を持つ無線周波信号を発生する送信装置と、前記電磁
シールド室の内部または外部の一方に設置され入力され
た前記無線周波信号を電波にして送信する送信用空中線
と、前記電磁シールド室の内部または外部の他方に設置
され前記電波を受信する受信用空中線と、前記受信用空
中線の受信電波から前記無線周波信号の成分を表わす被
監視信号を取り出す受信装置とからなる複数の電磁シー
ルド室の組み合わせを備え、この複数の電磁シールド室
の組み合わせの各受信装置が各前記被監視信号から各前
記受信用空中線のそれぞれの受信レベルを監視する監視
装置とを備えたものである。An electromagnetic shield room monitoring system according to the present invention transmits a radio frequency signal having an individual frequency to one electromagnetic shield room formed by enclosing a space with an electromagnetic shield surface provided with a conductor. A transmitting device to be generated, a transmitting antenna installed in one of the inside and the outside of the electromagnetic shield room and transmitting the input radio frequency signal as a radio wave, and installed in the other of the inside and the outside of the electromagnetic shield room A receiving antenna that receives the radio wave, and a receiving device that extracts a monitored signal representing a component of the radio frequency signal from the received radio wave of the receiving antenna, comprising a combination of a plurality of electromagnetic shielded chambers; A monitoring device for monitoring each reception level of each of the reception antennas from each of the monitored signals, wherein each reception device in the combination of the shielded rooms includes It is.
【０００９】この発明に係る電磁シールド室監視システ
ムは、導電体が施された電磁シールド面で空間を囲んで
形成された１個の電磁シールド室に対して、異なる周波
数を持つ複数の無線周波信号を発生する送信装置と、前
記電磁シールド室の内部または外部の一方に設置され入
力された前記無線周波信号を電波にして送信する送信用
空中線と、前記電磁シールド室の内部または外部の他方
であって複数方向の電磁シールド面に対し個別に設置さ
れ前記電波を受信する複数の受信用空中線と、それぞれ
の前記受信用空中線が受信した電波からそれぞれの前記
無線周波信号の成分を表わす被監視信号を取り出す受信
装置とからなる複数の電磁シールド室の組み合わせを備
え、この複数の電磁シールド室の組み合わせの各受信装
置の前記被監視信号から各前記電磁シールド室の組み合
わせのそれぞれの前記各受信用空中線の受信レベルを監
視する監視装置とを備えたものである。An electromagnetic shield room monitoring system according to the present invention provides a plurality of radio frequency signals having different frequencies for one electromagnetic shield room formed by surrounding a space with an electromagnetic shield surface provided with a conductor. A transmitting antenna installed inside or outside the electromagnetic shield room for transmitting the input radio frequency signal as a radio wave, and a transmitting antenna inside or outside the electromagnetic shield room. A plurality of receiving antennas that are individually installed on the electromagnetic shielding surfaces in a plurality of directions to receive the radio waves, and a monitored signal representing a component of each of the radio frequency signals from the radio waves received by each of the receiving antennas. A combination of a plurality of electromagnetic shielded chambers comprising a receiving device to be taken out, and the monitored signal of each receiving device in the combination of the plurality of electromagnetically shielded rooms is provided. From those having a monitoring device for monitoring the reception level of each of the respective receiving antenna of a combination of each of said electromagnetic shield chamber.
【００１０】この発明に係る電磁シールド室監視システ
ムは、上記各監視装置は、受信レベルに対応させて電磁
シールドの性能を表わす数値を表示する機能を有するも
のである。[0010] In the electromagnetic shield room monitoring system according to the present invention, each of the monitoring devices has a function of displaying a numerical value representing the performance of the electromagnetic shield in accordance with the reception level.
【００１１】この発明に係る電磁シールド室監視システ
ムは、上記各監視装置は、受信レベルが予め設定したス
レッショールド値を超えたときに警報を発する機能を有
するものである。In the electromagnetic shield room monitoring system according to the present invention, each of the above monitoring devices has a function of issuing an alarm when the reception level exceeds a preset threshold value.
【００１２】[0012]
【発明の実施の形態】以下、この発明の実施の一形態を
説明する。 実施の形態１．図１は、実施の形態１を適用した電磁シ
ールド室を示す一部切り欠け外観斜視図である。図にお
いて、１０は電磁シールド室で、天井面１１、床面１
２、壁面１３，１４，１５，１６からなる電磁シールド
面により囲まれ、電磁シールドされた空間を形成してい
る。これらの電磁シールド面１１乃至１６は実質的に連
続した金属の薄板やネット、導電性を付与した繊維布等
の導電体が施されたものである。２０はこの電磁シール
ド室１０の出入りのための扉であり、電磁波の漏洩を防
止するために周囲と同じ部材を使用して電磁シールドし
てある。３０は窓部で、金属網やガラス表面に金属の薄
膜を形成させた電磁シールド機能を有している。この電
磁シールド室１０の内部には天井板４０が設けられてお
り、これと電波的には同一電界である天井裏空間部５０
を有する。６０は送信用空中線で、例えば天井裏空間部
５０に収容されている。７０は受信用空中線で、電磁シ
ールド室外に設置され、送信用空中線６０と対峙した関
係に設置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a partially cutaway perspective view showing an electromagnetic shield chamber to which Embodiment 1 is applied. In the figure, reference numeral 10 denotes an electromagnetic shield room, and a ceiling surface 11 and a floor surface 1
2. It is surrounded by an electromagnetic shield surface composed of wall surfaces 13, 14, 15, 16 to form a space that is electromagnetically shielded. The electromagnetic shield surfaces 11 to 16 are provided with a substantially continuous metal thin plate, a net, or a conductor such as a fiber cloth provided with conductivity. Reference numeral 20 denotes a door for entering and exiting the electromagnetic shield room 10, which is electromagnetically shielded using the same member as the surroundings in order to prevent leakage of electromagnetic waves. A window 30 has an electromagnetic shielding function in which a metal thin film is formed on a metal net or a glass surface. A ceiling plate 40 is provided inside the electromagnetic shield room 10, and a space 50 above the ceiling, which has the same electric field in terms of radio waves.
Having. Reference numeral 60 denotes a transmitting antenna, which is accommodated in, for example, the space 50 above the ceiling. Numeral 70 denotes a receiving antenna, which is installed outside the electromagnetic shield room, and which is installed so as to face the transmitting antenna 60.
【００１３】図２は実施の形態１の電磁シールド室監視
システムの回路構成を示すブロック図である。図におい
て、８０は送信装置で、電磁シールド室１０の内部に設
置され、送信用空中線６０に例えば無変調の無線周波信
号を供給する。９０は電磁シールド室１０の外部に置か
れる受信装置で、受信用空中線７０で受信した電波から
送信用空中線６０の無線周波信号成分を取り出すための
ものである。１００は受信装置９０の出力が与えられメ
ータ、インジケータ、ブザー等で表示または警報音で確
認する監視装置である。FIG. 2 is a block diagram showing a circuit configuration of the electromagnetic shield room monitoring system according to the first embodiment. In the figure, reference numeral 80 denotes a transmitting device, which is installed inside the electromagnetic shield room 10 and supplies, for example, an unmodulated radio frequency signal to the transmitting antenna 60. Numeral 90 denotes a receiving device placed outside the electromagnetic shield room 10 for extracting a radio frequency signal component of the transmitting antenna 60 from the radio wave received by the receiving antenna 70. Reference numeral 100 denotes a monitoring device to which the output of the receiving device 90 is given and which is displayed on a meter, an indicator, a buzzer or the like or confirmed by an alarm sound.
【００１４】なお、図１では送信装置８０は図示してい
ないが、送信装置８０そのものは送信用空中線に対して
若干の離隔の位置に配置し、同軸ケーブル等で接続した
り、または大きさに余裕がある場合は送信用空中線６０
と同一箱体に内蔵できる場合もあり、電磁シールド室１
０の内外部の支障のない位置であればいずれでもよく、
特に設置場所を選ばない。また、受信装置９０および監
視装置１００についても同様に、原則として電磁シール
ド室１０の外部に設置するが、その位置については特定
されるものではない。Although the transmitting device 80 is not shown in FIG. 1, the transmitting device 80 is arranged at a slight distance from the transmitting antenna, and is connected with a coaxial cable or the like, or is reduced in size. If there is room, transmit antenna 60
Can be built in the same box as the
Any position is acceptable as long as there is no hindrance inside and outside of 0,
It doesn't matter where you install it. Similarly, the receiving device 90 and the monitoring device 100 are similarly installed outside the electromagnetically shielded room 10, but their positions are not specified.
【００１５】図２の回路の動作について説明する。常
時、送信装置８０は無変調の無線周波信号を発生し送信
用空中線６０に供給する。これにより、送信用空中線６
０から空中に電波が放射され、電磁界が形成される。こ
の電磁界は空中を伝搬し、電磁シールド室１０の電磁シ
ールドの欠陥部分を通過し、受信用空中線７０により受
信される。受信電波は受信装置９０により送信時の無線
周波信号の成分として取り出される。この無線周波信号
の成分は被監視信号として監視装置１００に与えられ、
受信用空中線７０の受信レベルが計測される。監視装置
１００において、受信レベルはメータやインジケータで
表示される。The operation of the circuit shown in FIG. 2 will be described. At all times, the transmitting device 80 generates an unmodulated radio frequency signal and supplies it to the transmitting antenna 60. Thereby, the transmitting antenna 6
Radio waves are radiated from 0 to the air, and an electromagnetic field is formed. This electromagnetic field propagates in the air, passes through a defective portion of the electromagnetic shield in the electromagnetic shield room 10, and is received by the receiving antenna 70. The reception radio wave is extracted by the receiving device 90 as a component of the radio frequency signal at the time of transmission. The component of the radio frequency signal is provided to the monitoring device 100 as a monitored signal,
The reception level of the reception antenna 70 is measured. In the monitoring device 100, the reception level is displayed by a meter or an indicator.
【００１６】監視装置１００では、例えば送信電力と受
信電力の間の伝搬損失の関係を、予め自由空間において
校正しておくことにより電磁シールドの性能を定量的に
把握できる。したがって、メータまたはインジケータ
は、電磁シールドの性能を表わす数値を表示するように
しておくとよい。また、監視装置１００には、受信レベ
ルが予め設定したスレッショールド値を超えると、イン
ジケータやブザーで電磁シールドの性能低下を警報する
手段を設けることもできる。さらに、補助手段として、
扉２０の開放時には、開放状態を検出する手段を設け、
開閉状態を監視装置１００で表示し、警報音に対しては
開放時にフェイドアウトするようにしてもよい。ここで
は、送信用空中線６０を電磁シールド室１０の内部に、
受信用空中線７０を電磁シールド室１０の外部に配置し
た場合について説明したが、この関係を逆にすることで
も電磁シールド室監視システムを構成することは可能で
ある。The monitoring apparatus 100 can quantitatively grasp the performance of the electromagnetic shield by calibrating the relationship between the transmission power and the transmission power, for example, in a free space in advance. Therefore, it is preferable that the meter or the indicator displays a numerical value indicating the performance of the electromagnetic shield. In addition, the monitoring device 100 may be provided with a unit that warns of a decrease in the performance of the electromagnetic shield using an indicator or a buzzer when the reception level exceeds a preset threshold value. Furthermore, as auxiliary means,
When the door 20 is opened, a means for detecting the open state is provided,
The open / closed state may be displayed on the monitoring device 100, and the alarm sound may be faded out when opened. Here, the transmitting antenna 60 is placed inside the electromagnetic shield room 10.
The case where the receiving antenna 70 is arranged outside the electromagnetic shield room 10 has been described. However, the electromagnetic shield room monitoring system can be configured by reversing this relationship.
【００１７】以上のように、この実施の形態１によれ
ば、電磁シールド室１０の内外に電磁シールド面１１乃
至１６を挟んで送信用空中線と受信用空中線を常設的に
設置し、電磁シールドの性能を常時監視できるため、電
磁シールド室１０の内部に設置したＯＡ機器に関して常
に適正なセキュリティレベルを維持する保守手段として
の効果がある。As described above, according to the first embodiment, the transmitting antenna and the receiving antenna are permanently installed inside and outside the electromagnetic shield room 10 with the electromagnetic shield surfaces 11 to 16 interposed therebetween. Since the performance can be constantly monitored, there is an effect as a maintenance means for always maintaining an appropriate security level for the OA equipment installed inside the electromagnetic shield room 10.
【００１８】実施の形態２．図３は実施の形態２に係る
電磁シールド室監視システムを示すブロック図である。
電磁シールド室１０が複数個配置され、各電磁シールド
室１０に対しては実施の形態１と同じ様に壁面１３，１
４，１５，１６の一つを挟んで送信用空中線６０と受信
用空中線７０が設けられ、それぞれの送信用空中線６０
からの電波を対応するそれぞれの受信用空中線７０で受
信できるように複数の電磁シールド室の組み合わせを構
成するものである。各電磁シールド室１０に対して配置
された受信用空中線７０の受信信号は、個別または共通
の受信装置９０に与えられる。受信装置９０で得られる
各無線周波信号の成分を表わす被監視信号が監視装置１
００に送られ、各受信用空中線７０の受信レベルが処理
されるように構成されている。この場合、受信装置９０
からの被監視信号は各無線周波信号の成分を時分割的に
順次切り替えたもので、これを監視装置１００ではコン
ピュータで分離し、各受信用空中線７０の受信レベルを
計測する。Embodiment 2 FIG. FIG. 3 is a block diagram showing an electromagnetic shield room monitoring system according to the second embodiment.
A plurality of electromagnetic shield chambers 10 are provided, and each of the electromagnetic shield chambers 10 has a wall surface 13, 1 as in the first embodiment.
A transmitting antenna 60 and a receiving antenna 70 are provided with one of the transmitting antennas 60 and 45 interposed therebetween.
A combination of a plurality of electromagnetically shielded chambers is configured so that radio waves from the receiving antenna 70 can be received by the corresponding receiving antennas 70. The received signal of the receiving antenna 70 arranged for each electromagnetic shield room 10 is given to the individual or common receiving device 90. The monitored signal representing the component of each radio frequency signal obtained by the receiving device 90 is
00, and the reception level of each receiving antenna 70 is processed. In this case, the receiving device 90
Is a signal obtained by sequentially switching the components of each radio frequency signal in a time-division manner. The monitoring apparatus 100 separates the signals by a computer and measures the reception level of each reception antenna 70.
【００１９】図３の回路は、例えば１つのビルの中に複
数の電磁シールド室１０が設置される場合において、セ
キュリティ管理を遠隔的に集中して実施する場合に適し
ている。この場合、監視装置１００には各受信装置９０
から社内ネット２００のようなオンライン手段または専
用ラインを介して被監視信号を送信して各受信レベルが
監視されるようにする。監視信号の伝送方法の例として
は、各受信用空中線７０について識別できるように各受
信装置９０で符号化した信号を時分割して送る方法が考
えられる。The circuit shown in FIG. 3 is suitable, for example, in a case where a plurality of electromagnetic shield rooms 10 are installed in one building, where security management is performed in a centralized manner remotely. In this case, each receiving device 90 is
Transmits a monitored signal through online means such as the company network 200 or a dedicated line so that each reception level is monitored. As an example of a method of transmitting the monitoring signal, a method of transmitting a signal encoded by each receiving device 90 in a time-division manner so that each receiving antenna 70 can be identified can be considered.
【００２０】以上のように、実施の形態２によれば、複
数の電磁シールド室の組み合わせがある場合に、これら
の各電磁シールドの性能を常時集中監視する電磁シール
ド監視システムを得ることができる効果がある。As described above, according to the second embodiment, when there is a combination of a plurality of electromagnetic shield chambers, it is possible to obtain an electromagnetic shield monitoring system that constantly monitors the performance of each of these electromagnetic shields. There is.
【００２１】実施の形態３．図４は実施の形態３に係る
電磁シールド室監視システムを示すブロック図である。
ここでは、送信用空中線６０に対向して４個の受信用空
中線７１，７２，７３，７４を壁面１３，１４，１５，
１６の方向の外部に設置した場合を示す。各受信用空中
線７１，７２，７３，７４の各受信信号が受信装置９０
に与えられるように構成されている。電磁障害の方向が
複数方向であったり、予め定めることができない場合に
は、このように各方向に応じて適当個数の受信用空中線
７１，７２，７３，７４を配置することが望ましい。Embodiment 3 FIG. 4 is a block diagram showing an electromagnetic shield room monitoring system according to the third embodiment.
Here, four reception antennas 71, 72, 73 and 74 are opposed to the transmission antenna 60 and the wall surfaces 13, 14, 15, and
16 shows a case where the device is installed outside in the direction of 16. Each reception signal of each reception antenna 71, 72, 73, 74 is received by the reception device 90.
It is configured to be given to. If the direction of the electromagnetic interference is plural or cannot be determined in advance, it is desirable to arrange an appropriate number of receiving antennas 71, 72, 73, 74 according to each direction.
【００２２】ここで、複数の受信用空中線７１，７２，
７３，７４を設ける場合には、受信装置との組み合わせ
で次の幾つかの方法が用いられる。これらの選択は用途
に応じて選択すればよい。 （１）各受信用空中線毎に個別の受信装置を設ける。 （２）各受信用空中線の出力信号を１台の受信装置で受
け、ハイブリッド回路等で合成し処理する。 （３）各受信用空中線の出力信号を１台の受信装置で受
け、時分割的切換えにより信号処理する。 また、ここでは送信用空中線６０が１個設置したケース
を説明したが、複数個を用いてもよい。Here, a plurality of receiving antennas 71, 72,
When providing 73 and 74, the following several methods are used in combination with the receiving device. These selections may be made according to the application. (1) An individual receiving device is provided for each receiving antenna. (2) An output signal of each receiving antenna is received by one receiver, and is combined and processed by a hybrid circuit or the like. (3) The output signal of each receiving antenna is received by one receiver, and signal processing is performed by time-division switching. Although the case where one transmitting antenna 60 is provided has been described here, a plurality of transmitting antennas 60 may be used.
【００２３】以上のように、実施の形態３よれば、受信
用空中線７１，７２，７３，７４を電磁シールド室１０
の複数の方向に配置して電磁シールドの性能を多角的に
監視できるようにしたので、各方向からの外来電磁妨害
に対して確実にセキュリティレベルを維持する保守手段
とすることができる効果がある。As described above, according to the third embodiment, the reception antennas 71, 72, 73, 74 are connected to the electromagnetic shield room 10
The electromagnetic shield is arranged in a plurality of directions so that the performance of the electromagnetic shield can be monitored from various angles, so that there is an effect that the maintenance means for surely maintaining the security level against the external electromagnetic interference from each direction can be provided. .
【００２４】実施の形態４．図５は実施の形態４に係る
電磁シールド室監視システムを示すブロック図である。
電磁シールド室１０が複数個配置され、それぞれが監視
のために電磁シールド室の組み合わせを形成する。各電
磁シールド室の組み合わせには、図４と同様に各電磁シ
ールド面方向に受信用空中線７１，７２，７３，７４が
設けられ、それぞれの室内に設置された送信用空中線６
０からの電波を受信できるようになっている。各電磁シ
ールド室１０に対して配置された受信用空中線７１，７
２，７３，７４の受信信号が個別の受信装置９０に与え
られ、各送信用空中線６０からの無線周波信号成分が取
り出される。各受信装置９０は、受信した各無線周波信
号の成分を表わす被監視信号を監視装置１００に送り、
コンピュータにより各電磁シールド室の受信用空中線７
１，７２，７３，７４の受信レベルを分離して処理す
る。この場合、各電磁シールド室１０に対応する送信装
置８０はそれぞれ個別の周波数の無線周波信号を発生さ
せて他との干渉を防げる。Embodiment 4 FIG. 5 is a block diagram showing an electromagnetic shield room monitoring system according to the fourth embodiment.
A plurality of electromagnetic shield chambers 10 are arranged, each forming a combination of electromagnetic shield chambers for monitoring. In the combination of the respective electromagnetic shield rooms, receiving antennas 71, 72, 73, 74 are provided in the direction of each electromagnetic shield surface as in FIG. 4, and the transmitting antennas 6 installed in the respective rooms are provided.
Radio waves from 0 can be received. Receiving antennas 71, 7 arranged for each electromagnetic shield room 10
The reception signals 2, 73, and 74 are provided to individual reception devices 90, and the radio frequency signal components from each transmission antenna 60 are extracted. Each receiving device 90 sends a monitored signal representing a component of each received radio frequency signal to the monitoring device 100,
Antenna for reception in each electromagnetic shield room by computer 7
1, 72, 73 and 74 are processed separately. In this case, the transmission device 80 corresponding to each electromagnetic shield room 10 generates a radio frequency signal of an individual frequency to prevent interference with others.
【００２５】図５の回路は、例えば１つのビルの中に複
数の電磁シールド室１０が設置される場合において、セ
キュリティ管理を遠隔的に集中して実施する場合に適し
ている。この場合、監視装置１００には各受信装置９０
から社内ネット２００のようなオンライン手段により被
監視信号を送信して各受信レベルを監視する。各受信装
置９０は、各電磁シールド質１０と受信用空中線７１，
７２，７３，７４を識別できるように無線周波信号の成
分を表わす被監視信号を時分割や他の方法で監視装置１
００に送信することになる。複数の電磁シールド室１０
について、信号処理を時分割的運用とすれば、それぞれ
を近接して設置することも可能となる。The circuit shown in FIG. 5 is suitable, for example, when a plurality of electromagnetic shield rooms 10 are installed in one building, and when security management is remotely and centrally performed. In this case, each receiving device 90 is
Transmits the monitored signal by online means such as the in-house network 200 to monitor each reception level. Each receiving device 90 includes each electromagnetic shield material 10 and the receiving antenna 71,
The monitored signal representing the component of the radio frequency signal is time-division-divided or another method so that the monitored device 1 can be identified as 72, 73, 74.
00 will be sent. Multiple electromagnetic shield chambers 10
If the signal processing is performed in a time-division manner, it is possible to install them in close proximity.
【００２６】実施の形態４によれば、受信用空中線７
１，７２，７３，７４を電磁シールド室１０の複数の方
向に配置して電磁シールドの性能を多角的に監視する電
磁シールド室の組み合わせを複数設けて、各電磁シール
ド室１０に関し各方向からの外来電磁妨害に対してセキ
ュリティレベルを維持すると共に、複数の電磁シールド
室１０の電磁シールド性能を集中監視できるシステムを
構築できる効果がある。According to the fourth embodiment, the receiving antenna 7
1, 72, 73, and 74 are arranged in a plurality of directions of the electromagnetic shield room 10 to provide a plurality of combinations of electromagnetic shield rooms for monitoring the performance of the electromagnetic shield from multiple angles. This has the effect of maintaining a security level against external electromagnetic interference and constructing a system capable of centrally monitoring the electromagnetic shielding performance of the plurality of electromagnetic shielding rooms 10.
【００２７】[0027]
【発明の効果】以上のように、この発明によれば、無線
周波信号を発生する送信装置と、導電体が施された電磁
シールド面で空間を囲んで形成された電磁シールド室の
内部または外部の一方に設置され入力された無線周波信
号を電波にして送信する送信用空中線と、電磁シールド
室の内部または外部の他方に設置され電波を受信する受
信用空中線と、受信用空中線の受信電波から無線周波信
号の成分を表わす被監視信号を取り出す受信装置と、被
監視信号から受信用空中線の受信レベルを監視する監視
装置とを備えるように構成したので、電磁シールドの性
能を常時自動で監視でき、電磁シールド室内部に設置し
たＯＡ機器に関して常に適正なセキュリティレベルを維
持することができる効果がある。As described above, according to the present invention, a transmitter for generating a radio frequency signal and an electromagnetic shield room formed inside or outside an electromagnetic shield chamber formed by surrounding an space with an electromagnetic shield surface provided with a conductor. An antenna for transmission that is installed on one side and transmits the input radio frequency signal as a radio wave, a reception antenna installed on the other side inside or outside the electromagnetic shield room and a reception antenna that receives the radio wave, and a reception antenna of the reception antenna The system is equipped with a receiving device that extracts the monitored signal representing the component of the radio frequency signal and a monitoring device that monitors the reception level of the receiving antenna from the monitored signal, so that the performance of the electromagnetic shield can always be automatically monitored. Thus, there is an effect that an appropriate security level can always be maintained for the OA equipment installed inside the electromagnetic shield room.
【００２８】この発明によれば、上記受信用空中線が電
磁シールド室の複数の方向の電磁シールド面に対して個
別に複数設置され、受信装置がそれぞれの受信用空中線
が受信した電波から無線周波信号の成分を表わす被監視
信号を取り出す機能を有し、監視装置が被監視信号から
受信用空中線の受信レベルを監視するように構成したの
で、電磁シールドの性能を常時自動かつ多角的に監視で
き、各方向からの外来電磁妨害に対して確実にセキュリ
ティレベルを維持することができる効果がある。According to the present invention, a plurality of the receiving antennas are individually provided on the electromagnetic shield surfaces in a plurality of directions of the electromagnetic shield chamber, and the receiving device can transmit the radio frequency signal from the radio wave received by each receiving antenna. It has a function of extracting the monitored signal representing the component of the component, and the monitoring device is configured to monitor the reception level of the receiving antenna from the monitored signal, so that the performance of the electromagnetic shield can always be automatically and multilaterally monitored, There is an effect that the security level can be reliably maintained against external electromagnetic interference from each direction.
【００２９】この発明によれば、導電体が施された電磁
シールド面で空間を囲んで形成された１個の電磁シール
ド室に対して、個別の周波数を持つ無線周波信号を発生
する送信装置と、電磁シールド室の内部または外部の一
方に設置され入力された無線周波信号を電波にして送信
する送信用空中線と、電磁シールド室の内部または外部
の他方に設置され電波を受信する受信用空中線と、受信
用空中線の受信電波から無線周波信号の成分を取り出す
受信装置とからなる複数の電磁シールド室の組み合わせ
を備え、この複数の電磁シールド室の組み合わせの各受
信装置が各成分を表わす被監視信号を取り出し、それぞ
れの電磁シールド室の組み合わせの被監視信号から各受
信用空中線のそれぞれの受信レベルを監視する監視装置
とを備えるように構成したので、複数の電磁シールド室
の組み合わせがある場合に、これらの各電磁シールドの
性能を常時集中監視する電磁シールド監視システムを得
ることができる効果がある。According to the present invention, there is provided a transmitting apparatus for generating a radio frequency signal having an individual frequency with respect to one electromagnetic shield room formed by surrounding an space with an electromagnetic shield surface provided with a conductor. A transmitting antenna installed inside or outside the electromagnetic shield room to transmit an input radio frequency signal as a radio wave, and a receiving antenna installed inside or outside the electromagnetic shield room to receive a radio wave. A combination of a plurality of electromagnetically shielded rooms comprising a receiving device for extracting a component of a radio frequency signal from a received radio wave of a receiving antenna, and each receiving device of the combination of the plurality of electromagnetically shielded rooms represents a monitored signal representing each component. And a monitoring device for monitoring each reception level of each reception antenna from the monitored signal of the combination of the respective electromagnetic shield rooms. Since form was, if there is a combination of a plurality of electromagnetic shield chamber, there is an effect that it is possible to obtain an electromagnetic shielding monitoring system for centralized monitoring of these performance of each electromagnetic shielding at all times.
【００３０】この発明によれば、導電体が施された電磁
シールド面で空間を囲んで形成された１個の電磁シール
ド室に対して、異なる周波数を持つ複数の無線周波信号
を発生する送信装置と、電磁シールド室の内部または外
部の一方に設置され入力された無線周波信号を電波にし
て送信する送信用空中線と、電磁シールド室の内部また
は外部の他方であって複数方向の電磁シールド面に対し
個別に設置され電波を受信する複数の受信用空中線と、
それぞれの受信用空中線が受信した電波からそれぞれの
無線周波信号の成分を表わす被監視信号を取り出す受信
装置とからなる複数の電磁シールド室の組み合わせを備
え、この複数の電磁シールド室の組み合わせの各受信装
置の被監視信号から各電磁シールド室の組み合わせのそ
れぞれの受信用空中線の受信レベルを監視する監視装置
とを備えるように構成したので、複数の電磁シールド室
がある場合にそれぞれの電磁シールドの性能を多角的に
監視し、各電磁シールド室の各方向からの外来電磁妨害
に対してセキュリティレベルを維持すると共に、複数の
電磁シールド室の電磁シールド性能を集中監視できる効
果がある。According to the present invention, a transmitting apparatus for generating a plurality of radio frequency signals having different frequencies for one electromagnetic shield room formed by surrounding an space with an electromagnetic shield surface provided with a conductor. And a transmitting antenna installed inside or outside the electromagnetic shield room for transmitting an input radio frequency signal as a radio wave, and an electromagnetic shield surface in the other direction inside or outside the electromagnetic shield room and in a plurality of directions. On the other hand, a plurality of receiving antennas that are individually installed and receive radio waves,
A receiving device for extracting a monitored signal representing a component of each radio frequency signal from a radio wave received by each receiving antenna, comprising a combination of a plurality of electromagnetically shielded rooms; And a monitoring device that monitors the reception level of each receiving antenna in the combination of each electromagnetic shield room from the monitored signal of the device, so that when there are multiple electromagnetic shield rooms, the performance of each electromagnetic shield Is monitored from multiple angles, the security level against external electromagnetic interference from each direction of each electromagnetic shield room is maintained, and the electromagnetic shield performance of a plurality of electromagnetic shield rooms can be centrally monitored.
【００３１】この発明によれば、上記各監視装置が受信
レベルに対応させて電磁シールドの性能を表わす数値を
表示する機能を有するように構成したので、電磁シール
ドの性能を常時視覚により監視でき、特別なスキルがな
くても電磁シールド室を監視管理できる効果がある。According to the present invention, since each of the monitoring devices has a function of displaying a numerical value representing the performance of the electromagnetic shield in correspondence with the reception level, the performance of the electromagnetic shield can always be monitored visually. There is an effect that the electromagnetic shield room can be monitored and managed without special skills.
【００３２】この発明によれば、さらに上記各監視装置
がそれぞれの受信レベルが予め設定したスレッショール
ド値を超えたときに警報を発する機能を有するように構
成したので、警報ランプや警報音により電磁シールドの
異常や劣化を喚起させることができ、特別なスキルがな
くても電磁シールド室を監視管理できる効果がある。According to the present invention, each of the monitoring devices has a function of issuing an alarm when the reception level of each of the monitoring devices exceeds a preset threshold value. It can evoke abnormalities and deterioration of the electromagnetic shield, and has the effect of monitoring and managing the electromagnetic shield room without any special skills.
【図１】 この発明の電磁シールド室監視システムに係
る実施の形態１を適用した電磁シールド室の一部切り欠
け外観斜視図である。FIG. 1 is a partially cutaway perspective view of an electromagnetic shield room to which an electromagnetic shield room monitoring system according to a first embodiment of the present invention is applied.
【図２】 この発明に係る実施の形態１の回路構成を示
すブロック図である。FIG. 2 is a block diagram illustrating a circuit configuration according to the first embodiment of the present invention.
【図３】 この発明に係る実施の形態２の回路構成を示
すブロック図である。FIG. 3 is a block diagram showing a circuit configuration according to a second embodiment of the present invention.
【図４】 この発明に係る実施の形態３の回路構成を示
すブロック図である。FIG. 4 is a block diagram showing a circuit configuration according to a third embodiment of the present invention.
【図５】 この発明に係る実施の形態４の回路構成を示
すブロック図である。FIG. 5 is a block diagram showing a circuit configuration according to a fourth embodiment of the present invention.
１０ 電磁シールド室、１１ 天井面、１２ 床面、１
３，１４，１５，１６壁面、２０ 扉、３０ 窓、４０
天井板、５０ 天井裏空間部、６０ 送信用空中線、
７０，７１，７２，７３，７４ 受信用空中線、８０
送信装置、９０ 受信装置、１００ 監視装置、２００
社内ネット。10 electromagnetic shield room, 11 ceiling surface, 12 floor surface, 1
3, 14, 15, 16 wall, 20 doors, 30 windows, 40
Ceiling board, 50 ceiling space, 60 transmitting antenna,
70, 71, 72, 73, 74 Antenna for reception, 80
Transmitting device, 90 receiving device, 100 monitoring device, 200
In-house net.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 栄二郎 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 横山 正博 大阪府大阪市中央区高麗橋４丁目６番２号 株式会社日建設計内 Ｆターム(参考） 5E321 AA42 GG05 GH10 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Eijiro Kato 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Within Mitsui Electric Co., Ltd. (72) Inventor Masahiro Yokoyama 4-6-1 Komyobashi, Chuo-ku, Osaka-shi, Osaka No. Nikken Sekkei Inc. F-term (reference) 5E321 AA42 GG05 GH10
Claims (6)
れた電磁シールド室の内部または外部の一方に設置され
入力された前記無線周波信号を電波にして送信する送信
用空中線と、 前記電磁シールド室の内部または外部の他方に設置され
前記電波を受信する受信用空中線と、 前記受信用空中線の受信電波から前記無線周波信号の成
分を表わす被監視信号を取り出す受信装置と、 前記被監視信号から前記受信用空中線の受信レベルを監
視する監視装置とを備えたことを特徴とする電磁シール
ド室監視システム。1. A transmitting device for generating a radio frequency signal, and a radio frequency signal input and installed inside or outside an electromagnetic shield room formed by surrounding a space with an electromagnetic shield surface provided with a conductor. A transmitting antenna for transmitting a signal as a radio wave, a receiving antenna installed inside or outside the electromagnetic shield room to receive the radio wave, and a component of the radio frequency signal from the received radio wave of the receiving antenna. An electromagnetic shield room monitoring system, comprising: a receiving device that extracts a monitored signal to be represented; and a monitoring device that monitors a reception level of the receiving antenna from the monitored signal.
方向の電磁シールド面に対して個別に複数設置され、受
信装置がそれぞれの前記受信用空中線が受信した電波か
ら無線周波信号の成分を表わす被監視信号を取り出す機
能を有し、監視装置が前記被監視信号からそれぞれの前
記受信用空中線の受信レベルを監視することを特徴とす
る請求項１記載の電磁シールド室監視システム。2. A plurality of receiving antennas are individually provided on electromagnetic shielding surfaces in a plurality of directions of an electromagnetic shielding room, and a receiving device represents a component of a radio frequency signal from a radio wave received by each of the receiving antennas. 2. The electromagnetic shield room monitoring system according to claim 1, further comprising a function of extracting a monitored signal, wherein a monitoring device monitors a reception level of each of the receiving antennas from the monitored signal.
を囲んで形成された１個の電磁シールド室に対して、個
別の周波数を持つ無線周波信号を発生する送信装置と、 前記電磁シールド室の内部または外部の一方に設置され
入力された前記無線周波信号を電波にして送信する送信
用空中線と、 前記電磁シールド室の内部または外部の他方に設置され
前記電波を受信する受信用空中線と、 前記受信用空中線の受信電波から前記無線周波信号の成
分を取り出す受信装置とからなる複数の電磁シールド室
の組み合わせを備え、 この複数の電磁シールド室の組み合わせの各受信装置が
各前記成分を表わす被監視信号を取り出し、それぞれの
前記電磁シールド室の組み合わせの各前記被監視信号か
ら各前記受信用空中線のそれぞれの受信レベルを監視す
る監視装置とを備えたことを特徴とする電磁シールド室
監視システム。3. A transmission device for generating a radio frequency signal having an individual frequency with respect to one electromagnetic shield room formed by surrounding a space with an electromagnetic shield surface provided with a conductor; A transmitting antenna installed inside or outside the room and transmitting the input radio frequency signal as a radio wave, and a receiving antenna installed inside or outside the electromagnetically shielded room to receive the radio wave. A combination of a plurality of electromagnetically shielded rooms comprising a receiving device for extracting a component of the radio frequency signal from a received radio wave of the receiving antenna, wherein each receiving device of the combination of the plurality of electromagnetically shielded rooms represents each of the components. The monitored signal is taken out, and the reception level of each of the receiving antennas is monitored from the monitored signal of each combination of the electromagnetic shield chambers. Electromagnetic shielding chamber monitoring system characterized by comprising a monitoring device that.
を囲んで形成された１個の電磁シールド室に対して、異
なる周波数を持つ複数の無線周波信号を発生する送信装
置と、 前記電磁シールド室の内部または外部の一方に設置され
入力された前記無線周波信号を電波にして送信する送信
用空中線と、 前記電磁シールド室の内部または外部の他方であって複
数方向の電磁シールド面に対し個別に設置され前記電波
を受信する複数の受信用空中線と、 それぞれの前記受信用空中線が受信した電波からそれぞ
れの前記無線周波信号の成分を表わす被監視信号を取り
出す受信装置とからなる複数の電磁シールド室の組み合
わせを備え、 この複数の前記電磁シールド室の組み合わせの各受信装
置の前記被監視信号から各前記電磁シールド室の組み合
わせのそれぞれの前記受信用空中線の受信レベルを監視
する監視装置とを備えたことを特徴とする電磁シールド
室監視システム。4. A transmission device for generating a plurality of radio frequency signals having different frequencies for one electromagnetic shield room formed by surrounding a space with an electromagnetic shield surface provided with a conductor; A transmitting antenna installed in one of the inside and outside of the shield room and transmitting the input radio frequency signal as a radio wave, and the other of the inside or outside of the electromagnetic shield room and the electromagnetic shield surface in a plurality of directions. A plurality of electromagnetic antennas each comprising a plurality of receiving antennas individually installed to receive the radio wave, and a receiving device for extracting a monitored signal representing a component of each radio frequency signal from the radio wave received by each of the receiving antennas A combination of the shielded chambers, and a combination of each of the electromagnetic shielded chambers based on the monitored signal of each receiver of the combination of the plurality of electromagnetically shielded chambers. Electromagnetic shielding room monitoring system is characterized in that a monitoring device for monitoring a respective received levels of the reception antenna of.
磁シールドの性能を表わす数値を表示する機能を有する
ことを特徴とする請求項１から請求項４のうちのいずれ
か１項記載の電磁シールド室監視システム。5. The electromagnetic device according to claim 1, wherein the monitoring device has a function of displaying a numerical value representing the performance of the electromagnetic shield in correspondence with the reception level. Shield room monitoring system.
スレッショールド値を超えたときに警報を発する機能を
有することを特徴とする請求項１から請求項５のうちの
いずれか１項記載の電磁シールド室監視システム。6. The monitoring device according to claim 1, wherein the monitoring device has a function of issuing an alarm when the reception level exceeds a preset threshold value. Electromagnetic shield room monitoring system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000280644A JP3664961B2 (en) | 2000-09-14 | 2000-09-14 | Electromagnetic shield room system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000280644A JP3664961B2 (en) | 2000-09-14 | 2000-09-14 | Electromagnetic shield room system |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005002641A Division JP4633476B2 (en) | 2005-01-07 | 2005-01-07 | Electromagnetic shield room system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2002094288A true JP2002094288A (en) | 2002-03-29 |
| JP2002094288A5 JP2002094288A5 (en) | 2004-12-02 |
| JP3664961B2 JP3664961B2 (en) | 2005-06-29 |
Family
ID=18765434
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000280644A Expired - Lifetime JP3664961B2 (en) | 2000-09-14 | 2000-09-14 | Electromagnetic shield room system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007073861A (en) * | 2005-09-09 | 2007-03-22 | Nec Tokin Corp | System and method for monitoring shielding performance |
| JP2012202946A (en) * | 2011-03-28 | 2012-10-22 | Mitsubishi Electric Corp | Shielded room monitoring system |
| JP2012249148A (en) * | 2011-05-30 | 2012-12-13 | Japan Radio Co Ltd | Broadcast control apparatus and image broadcast unit |
| KR102216359B1 (en) * | 2020-08-31 | 2021-02-18 | 신건일 | remote monitoring system for electro-magnetic wave shielding observation |
| CN116165446A (en) * | 2023-01-03 | 2023-05-26 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
-
2000
- 2000-09-14 JP JP2000280644A patent/JP3664961B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007073861A (en) * | 2005-09-09 | 2007-03-22 | Nec Tokin Corp | System and method for monitoring shielding performance |
| JP4526033B2 (en) * | 2005-09-09 | 2010-08-18 | Ｎｅｃトーキン株式会社 | Shielding performance monitoring system and shielding performance monitoring method |
| JP2012202946A (en) * | 2011-03-28 | 2012-10-22 | Mitsubishi Electric Corp | Shielded room monitoring system |
| JP2012249148A (en) * | 2011-05-30 | 2012-12-13 | Japan Radio Co Ltd | Broadcast control apparatus and image broadcast unit |
| KR102216359B1 (en) * | 2020-08-31 | 2021-02-18 | 신건일 | remote monitoring system for electro-magnetic wave shielding observation |
| CN116165446A (en) * | 2023-01-03 | 2023-05-26 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
| CN116165446B (en) * | 2023-01-03 | 2023-08-11 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3664961B2 (en) | 2005-06-29 |
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