JPH0769370B2 - Measuring method of breaking performance of electromagnetically shielded room - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the shielding performance of an electromagnetic shield room, which is used for examining the shielding performance of electromagnetic waves in an electromagnetic shield room or the like.

[0002]

2. Description of the Related Art Conventionally, an electromagnetically shielded room has a performance as designed if it is securely assembled on-site, but it is appropriate to join panels such as outer walls constituting the electromagnetically shielded room and doors. If not done, the electromagnetic wave leaks from the defective joint portion into the electromagnetic shield room, and the electromagnetic wave shielding performance is deteriorated. Therefore, conventionally, after assembling the electromagnetically shielded room on site, in order to confirm the performance of the electromagnetically shielded room, a dedicated electromagnetic wave measuring instrument was used for the investigation.

[0003]

However, the dedicated electromagnetic wave measuring device used for confirming the electromagnetic wave shielding performance of the electromagnetically shielded room is expensive, and the measurement work using the dedicated electromagnetic wave measuring device is complicated, It took a considerable amount of time to learn how to work.

In view of the above circumstances, it is an object of the present invention to provide a method for measuring the breaking performance of an electromagnetic shielded room, which makes the cost for checking the assembly accuracy of the electromagnetically shielded room inexpensive and makes it easy to learn the working method. To do.

[0005]

Means for Solving the Problems That is, the present invention has an antenna (11), and the antenna (11) is provided with the antenna (1).
Receiving means (15) capable of detecting and amplifying the radio wave received by 1)
And an electromagnetic wave measuring device (1) which is provided with a measuring means (16, 17) capable of displaying the intensity of the radio wave amplified by the receiving means (15).
0), the broadcast wave (31) transmitted from the broadcasting station (30) inside and outside the electromagnetic shield room (1) is measured by the electromagnetic wave measuring device (10), and the measured value is compared with a design reference value. Then, the shield performance of the electromagnetic shield room (1) is measured.

The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and the present description is not limited to the description in the drawings. The same applies to the column of "action" below.

[0007]

With the above construction, the present invention operates so that the broadcast radio wave (31) of the broadcasting station (30) can be used as the transmitted radio wave. In addition, the electromagnetic wave measuring device (10)
It works so that it is easy to handle.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a method of measuring the shielding performance of an electromagnetically shielded room according to the present invention, and FIG. 2 is a diagram showing an electromagnetic wave measuring device according to the present invention.

Electromagnetic wave measuring device 10 used in the present invention
As shown in FIG. 2, it has a rod-shaped antenna 11, and at the tip of the antenna 11, a coil 13 composed of a coil capable of receiving radio waves of a radio wave in a specific direction is provided. The antenna 1 is provided behind the antenna 11 (downward in the figure).
A rectangular bowl-shaped cover guard 12 is provided so as to prevent radio waves from entering the antenna 11 from directions other than the receiving direction such that the head 11a of 1 is the receiving direction. Also,
The antenna 11 is provided with a radio wave reception unit 15 that detects and amplifies a specific radio wave among the received radio waves,
The radio wave receiving unit 15 is connected to a sensitivity measuring unit 16 that can measure the amplified radio wave as a current value and display it on the display unit 17. That is, the radio wave receiving unit 15 is composed of general-purpose components such as a radio, and the sensitivity measuring unit 16 is composed of general-purpose components such as an ammeter. By the way, the object to be measured using this device 10 is an electromagnetically shielded room 1 as shown in FIG.
The electromagnetic shield room 1 is a rectangular parallelepiped room in which a plurality of panels 2 and doors 3 are combined. Panel 2
Is composed of a rectangular plate-shaped member having a property of blocking electromagnetic waves, and is assembled by joining the panels 2 together via the joint portion 2a. The door 3 is made of a rectangular plate-shaped member having a property of blocking electromagnetic waves, and is attached to the panel 2 via the attachment portion 3a. Further, a door knob 4 is provided on the door 3 in such a manner that the door 3 can be opened and closed.

Since the present invention has the above-described structure, as shown in FIG. 1, the electromagnetic wave measuring apparatus 10 is a radio wave which is a specific radio wave transmitted from the radio station 30 located on the left side of the drawing. 31 is the antenna 1 of the electromagnetic wave measuring apparatus 10.
1, the intensity of the received radio wave can be known by the sensitivity measuring unit 16 and the display unit 17 in the form of a current value. Here, radio waves 3 around the electromagnetically shielded room 1 located far away from the radio station 30
The intensity of 1 is considered to be uniform. Therefore, the intensity of the radio wave 31 outside the electromagnetically shielded room 1 is measured by the electromagnetic wave measuring device 10 (indicated by a two-dot chain line in the figure), and the measured value is used as a reference value. Then, similarly, the intensity of the radio wave 31 is measured by the electromagnetic wave measuring device 10 in the electromagnetically shielded room 1. For example, the antenna head 10a of the electromagnetic wave measuring device 10 (indicated by a solid line in the figure) is directed toward the attachment section 3a of the panel 2 and the door 3 and the radio wave leaking from the attachment section 3a (indicated by a dashed arrow in the figure) is measured. Therefore, the joint 2
It is possible to check whether the panel 2 is assembled and the door 3 is properly mounted by measuring the electric wave leaking from the mounting portion 3a and the like and comparing it with the reference value. That is, the ratio of the radio wave sensitivities inside and outside the electromagnetically shielded room 1 reliably assembled using the electromagnetic wave measuring device 10 is checked in advance and set as a design reference value, and the measurement result after the electromagnetically shielded room 1 is assembled at the site. It is possible to complete the on-site assembly of the electromagnetically shielded room 1 by comparing the above-mentioned design reference value with the above-mentioned design reference value and judging the quality of the assembling method.
Moreover, since general-purpose parts can be used as the constituent parts and the number of constituent parts is small, the electromagnetic wave measuring apparatus 10 can be manufactured at low cost.

[0011]

As described above, the present invention has an antenna such as the antenna 11 and is connected to a receiving means such as a radio wave receiver 15 capable of detecting and amplifying the radio wave received by the antenna. And a display unit 1 for displaying the intensity of the radio wave amplified by the receiving unit on the receiving unit.
Using the electromagnetic wave measuring device 10 configured by providing measuring means 7 etc., the electromagnetic wave measuring device 10 measures broadcast electric waves such as radio electric waves 31 transmitted from a broadcasting station such as a radio station 30 inside and outside the electromagnetic shield room 1. Since the measured value is compared with the design reference value to measure the shielding performance of the electromagnetic shield room 1, the broadcast wave of the broadcasting station is used as the transmitted radio wave, and an inexpensive electromagnetic wave measuring device is used. Therefore, the cost for confirming the assembly accuracy of the electromagnetically shielded room can be reduced. Moreover, since the electromagnetic wave measuring device is easy to handle, it is easy to learn the working method.

[Brief description of drawings]

FIG. 1 is a diagram showing a method for measuring the shielding performance of an electromagnetically shielded room according to the present invention.

FIG. 2 is a diagram showing an electromagnetic wave measuring apparatus according to the present invention.

[Explanation of symbols]

 1 ... Electromagnetic shielded room 10 ... Electromagnetic wave measuring device 11 ... Antenna (antenna) 15 ... Receiving means (radio wave receiving section) 16 ... Measuring means (sensitivity measuring section) 17 ... Measuring means (display section) 30 ... … Broadcasting stations (radio stations) 31 …… Broadcast radio waves (radio waves)

Claims (1)

[Claims] 1. An antenna having an antenna, wherein the antenna is provided with a receiving unit that is capable of detecting and amplifying the radio wave received by the antenna, and the receiving unit displays the intensity of the radio wave amplified by the receiving unit. Using an electromagnetic wave measuring device configured by providing a measuring means to obtain, broadcast radio waves transmitted from a broadcasting station inside and outside an electromagnetically shielded room are measured by the electromagnetic wave measuring device, and the measured value is compared with a design reference value A method for measuring the shielding performance of an electromagnetically shielded room configured to measure the shielding performance of an electromagnetically shielded room.