JPH05119089A - Electromagnetic radiation visualizing device - Google Patents

Abstract

PURPOSE:To visualize the radiated position, direction, and intensity of electromagnetic waves from an object to be measured in a three-dimensional image so that an appropriate measure can be quickly taken against a radio wave absorption trouble. CONSTITUTION:The length of the variable length dipole antenna 3 of a measurement unit 1 is fixed to the length meeting a measuring frequency and the inside of a radio wave dark room 7 is scanned with a three-dimensionally moving mechanism 4. At the time of scanning the inside of the dark room 7, the inside is optically made darker and the brightness of a lamp 2 proportional to the electric field intensity at each measuring point is recorded with a stereo camera 5 under bulb exposure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic radiation visualization device for measuring the electric field intensity radiated from an object to be measured and visualizing the appearance of the object to be measured from its size and direction.

[0002]

2. Description of the Related Art In conventional electromagnetic radiation measurement, the magnitude and direction of radiation have been numerically obtained. For example, in the direction, the object to be measured is horizontally rotated, the antenna of the measuring device is searched up and down, and the size is obtained by measuring the electric field strength at that position.

[0003]

In order to search the radiation intensity and direction by this conventional electromagnetic radiation measuring method, it was necessary to grasp the image from numerical values. Therefore, it takes a lot of experience to draw an image at the measurement points of each frequency and to understand how the state of radiation changes as the frequency changes.

[0004]

SUMMARY OF THE INVENTION An electromagnetic radiation visualization device of the present invention includes a dipole antenna having a variable length, a lamp capable of changing brightness, an amplifier in a wide band or a plurality of frequency bands, a detector and a power source. A measuring unit housed in a treated housing, a unit moving means for moving the measuring unit to each point of three-dimensional coordinates, and a change in the brightness of the lamp in proportion to the electric field strength at the position of the measuring unit. And a control means for controlling the brightness of the lamp to be recorded by scanning the object to be measured three-dimensionally and editing and reproducing the recorded content for visualization.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of a measuring unit in FIG. 1, FIG. 3 is a block diagram of the measuring unit in FIG. 2, and FIG. It is a perspective view showing an example of an electromagnetic radiation radiation pattern.

In the present embodiment, as shown in FIG. 1, the length of the variable length dipole antenna 3 of the measuring unit 1 is fixed to the length corresponding to the measuring frequency, and the three-dimensional moving mechanism 4 is used to move the inside of the anechoic chamber 7. To scan. At this time, the inside of the anechoic chamber 7 is optically darkened, and the brightness of the lamp 2 proportional to the electric field strength at each measurement point is recorded in the stereo camera 5 with open exposure. As a result, as illustrated in FIG. 4, the direction and size of the electromagnetic radiation from the DUT 6 is obtained as a three-dimensional image, and the electromagnetic radiation pattern 8 is obtained.

The housing of the measuring unit 1 shown in FIG. 2 is subjected to radio wave absorption processing to reduce disturbance of radiated radio waves. Further, the lamp 2 uses monochromatic or multi-colored light, which is proportional to the intensity change and has high reproducibility. The length of the variable length dipole antenna 3 is set manually or automatically for each measurement frequency.

Then, as shown in FIG. 3, the high frequency received from the variable length dipole antenna 3 is tuned by the synchronizing circuit 9,
After being amplified by the amplifier 10, it is detected by the detection circuit 11, and the voltage after passing through the low-pass filter 12 is power-amplified by the amplifier 13 so that the lamp 2 is illuminated. Also, in order to avoid radio wave disturbance due to wiring to the measurement unit 1, the power supply 14 is built into the unit.

[0009]

As described above, the electromagnetic radiation visualization device of the present invention enables the radiation position, direction, and intensity of electromagnetic waves from an object to be measured, which has been difficult to capture up to now, to be viewed stereoscopically. Therefore, it is possible to appropriately and promptly take countermeasures against electromagnetic wave interference (EMI).

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

2 is a perspective view of the measurement unit in FIG. 1. FIG.

FIG. 3 is a block diagram of the measurement unit in FIG.

FIG. 4 is a perspective view showing an example of an electromagnetic radiation pattern from an object to be measured in FIG.

[Explanation of symbols]

 1 Measuring Unit 2 Lamp 3 Variable Length Dipole Antenna 4 3D Moving Mechanism 5 Stereo Camera 6 DUT 7 Anechoic Chamber 8 Electromagnetic Radiation Pattern 9 Tuning Circuit 10 Amplifier 11 Detection Circuit 12 Low Pass Filter 13 Amplifier 14 Power Supply

Claims (1)

[Claims] 1. A variable length dipole antenna, a lamp whose brightness can be changed, an amplifier for a wide band or a plurality of frequency bands, a detector and a power supply unit which are housed in a housing that has been subjected to electromagnetic wave absorption processing. The object to be measured is three-dimensionally provided with unit moving means for moving the measuring unit to each point of three-dimensional coordinates and control means for changing the brightness of the lamp in proportion to the electric field strength at the position of the measuring unit. The electromagnetic radiation visualization device is characterized in that the change in the brightness of the lamp is recorded by scanning, and the recorded contents are edited and reproduced for visualization.