JP2002243658A - System for measuring performance of radio wave absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for efficiently measuring the radio wave absorption performance of a radio wave absorbing material, e.g. road. SOLUTION: While controlling an antenna setting means 52 to set a pair of transmission antenna 12 and a receiving antenna 14 at the regular reflection position at different angles with respect to a radio wave absorbing material, a control means 54 controls a measuring means 50 to measure the radio wave absorbing performance of an object sequentially and automatically, by radiating radio waves from the transmission antenna 12 and receiving the radio waves reflected from the object by the receiving antenna 14. Since the work for measuring the radio wave absorption performance can be repeated automatically under control of the control means 54, repetitive work and labor are reduced and the work efficiency can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for measuring the performance of electromagnetic wave absorbing materials constituting roads, buildings, etc., which absorb unnecessary electromagnetic waves in order to prevent electromagnetic interference.

[0002]

2. Description of the Related Art As part of an intelligent transportation system (ITS), which is a next-generation road transportation system, development of an automatic toll collection system (ETC) for toll roads and a driving support system (AHS) for vehicles running on roads. Is progressing.

[0003] This automatic toll collection system does not stop the traffic of a car traveling on a toll road such as an expressway, and the automatic toll payment device (IC card, radio wave tag, etc.) mounted on the car and the toll booth of the toll booth. This is a system for collecting tolls by wireless communication with an automatic toll collection device arranged at a gate. This automatic toll collection system is expected to be introduced not only from the viewpoint of simple payment of tolls, but also from the viewpoint of alleviating traffic congestion and reducing labor costs.

In an automatic toll collection system, a detection means such as a radar of an automatic toll collection device arranged at the toll gate detects that a car traveling on a road has approached a predetermined distance from the toll gate.

[0005] Then, the wireless communication device of the automatic toll collection device transmits a signal to the running car, and information (vehicle type, contract contents, Payment account, etc.) by wireless communication. Then, the vehicle-side automatic toll payment device transmits information necessary for determining the vehicle toll to the wireless communication device of the automatic toll collection device.

[0006] The automatic toll collection device that receives the information necessary for discriminating the toll of the car calculates the toll based on the mileage of the car on a toll road and executes the toll collection processing.

[0007] Further, in a vehicle driving support system, for example, a lane marker is installed at each predetermined position on a road along the driving lane on the road, and a radar of a driving support device mounted on the vehicle running on the road is provided. And the like detect the position of the lane marker to detect an appropriate driving route, and warn the driver of the possibility of departure from the driving lane or drive the vehicle to drive the vehicle along the appropriate driving route. Automatically intervene in the equipment to help drive safely. In addition, various communications are performed between the communication device of the lane marker disposed on the road and the vehicle, which is used for determining a traveling route by the car navigation system and provided for convenience of transportation.

In such an automatic toll collection system or an automobile driving support system in such an intelligent transportation system, a traveling automobile is used as an object to communicate and detect or measure by using electromagnetic waves of a relatively high frequency. . For this reason, at the moment when a running automobile runs through a predetermined place, it is necessary to accurately execute an operation of communicating, detecting or measuring using electromagnetic waves of a relatively high frequency.

However, in the automatic toll collection system or the vehicle driving support system, unnecessary high-frequency electromagnetic waves emitted from these systems are radiated on a road or the like to generate unnecessary scattered electromagnetic waves. The unnecessary scattered electromagnetic waves are received by the receiver of the automatic toll collection system or the driving support system of the automobile, and may hinder communication or cause an error in the operation of detection or measurement.

[0010] Therefore, conventionally, a pavement version of a road portion in the vicinity of an area where an automatic toll collection system communicates with a vehicle or a road portion where a lane marker is installed in a vehicle driving support system is used to efficiently reduce electromagnetic waves emitted from these systems. It has been proposed to be configured as a radio wave absorbing material that absorbs well and suppresses the generation of unnecessary scattered electromagnetic waves.

[0011]

As described above, a road portion in the vicinity where an automatic toll collection system communicates with a car,
In the case of constructing a building such as a paved slab of a road part where a lane marker is installed in an automobile driving support system with a radio wave absorbing material, construct the paved slab with a concrete or asphalt material to which a material having radio wave absorbing properties is added. Use a concrete or asphalt material to construct a part of a building that exhibits a radio wave absorption function.

A building such as a road constituted as such a radio wave absorbing material is constructed and constructed at a construction site like a general road.

For this reason, the performance of a building made of the radio wave absorbing material is evaluated at a construction site, and the construction quality is assured so that the building such as the paved slab of the road properly exhibits the function of absorbing radio waves. There is a need.

[0014] The performance measurement of such a radio wave absorbing material is performed by reflecting the electromagnetic wave emitted from the transmitting antenna to the radio wave absorbing material and receiving it by the receiving antenna.

When a test of oblique incidence performance measurement is performed as a performance measurement of a radio wave absorbing material, various types of transmission antennas and receiving antennas are maintained while maintaining a so-called regular reflection state with respect to the radio wave absorbing material. This is done by changing the angle and position.

However, when oblique incidence performance measurement is performed on an electromagnetic wave absorbing material constituting a building such as a road constructed outdoors, the transmitting antenna and the receiving antenna are in a state of regular reflection on the electromagnetic wave absorbing material. It takes a lot of time and labor to change and adjust the angle and position to be different, and the measurement work must be interrupted every time the transmitting antenna and the receiving antenna are changed to different angles, which is inefficient. There is a problem.

Further, there has been no suitable system for measuring the performance of radio wave absorbing materials which is automated so that such oblique incidence performance measurement can be performed quickly and without any trouble.

In consideration of the above facts, the present invention is a radio wave absorbing material performance measuring system suitable for efficiently measuring the radio wave absorbing performance of a radio wave absorbing material constituting a building such as a road constructed outdoors. The purpose is to provide a new.

[0019]

According to a first aspect of the present invention, there is provided a system for measuring the performance of a radio wave absorbing material, wherein the pair of radio wave absorbing materials can be set at mutually different regular reflection positions at different angles with respect to the radio wave absorbing material. A transmitting antenna and a receiving antenna, a measuring means for emitting a radio wave from the transmitting antenna, reflecting the radio wave to a measurement target, receiving the radio wave with the receiving antenna and measuring the performance of the radio wave absorption of the measurement target, and a pair of transmission antennas And an antenna setting means for selectively setting the state in which the receiving antenna is set to a different regular reflection angle with respect to the radio wave absorbing material, and an angular position of the pair of transmitting antenna and receiving antenna set by the antenna setting means. When a pair of transmitting antenna and receiving antenna are set at each angular position while performing control to automatically change sequentially, measurement work of radio wave absorption performance is performed respectively. And control means for controlling to row,
It is characterized by having.

With the above configuration, the pair of transmitting antenna and receiving antenna are set to the positions of regular reflection at a required angle by the antenna setting unit under the control of the control unit, and the measuring unit measures the radio wave absorption performance. Then, the control operation of setting the pair of transmitting antennas and receiving antennas at the positions of regular reflection at different predetermined angles by the antenna setting means and performing the measuring operation of the radio wave absorption performance by the measuring means is repeated a required number of times. . Since the control means automatically repeats the above-described control operation in this way, the number of repetitive operations when the operator performs the operation of measuring the radio wave absorption performance is reduced,
Reduce labor and work efficiently. In addition, since the procedure of the measurement operation of the radio wave absorption performance automatically proceeds, measurement errors can be reduced, and the measurement operation of the radio wave absorption performance can be performed quickly. Further, since the performance measuring system of the radio wave absorbing material can easily perform the operation of measuring the radio wave absorbing performance, it is suitable for measuring the radio wave absorbing performance of the radio wave absorbing material such as a road constructed outdoors.

According to a second aspect of the present invention, there is provided a performance measuring system for a radio wave absorbing material, wherein a pair of a transmitting antenna and a receiving antenna can be set at mutually regular reflection positions at different angles with respect to the radio wave absorbing material. And a measuring means for emitting a radio wave from the transmitting antenna, reflecting the radio wave to the object to be measured, receiving the signal at the receiving antenna, and measuring the performance of the object to absorb the radio wave, and a pair of the transmitting antenna and the receiving antenna. Antenna setting means for selectively setting a state in which different regular reflection angles are set for the absorbing material, and angular positions of a pair of transmitting antennas and receiving antennas set by the antenna setting means are automatically and sequentially changed. While performing the control, in a state where the pair of transmitting antenna and the receiving antenna are set at each angular position, measuring work of the radio wave absorption performance for the radio wave absorbing material, Control means for performing the measurement work of the radio wave absorption performance for the reflector placed on the wave absorbing material, respectively, and controlling the measured value for the radio wave absorbing material and the measured value for the reflector so that they can be compared and evaluated; It is characterized by having.

With the above configuration, the pair of transmitting antenna and receiving antenna are set to the positions of regular reflection at a required angle by the antenna setting means under the control of the control means, and the radio wave absorbing material and Performing the measurement work of the radio wave absorption performance with respect to the reflector, respectively, then set a pair of transmission antenna and reception antenna at the regular reflection position at a different predetermined angle by the antenna setting means, by the measurement means, radio wave absorbing material, The control operation of executing the measurement operation of the radio wave absorption performance with respect to the reflection plate is repeated a required number of times. As described above, since the control means automatically repeats the above-described control operation, it is possible to reduce the number of repetitive operations when the operator performs the measurement operation of the electromagnetic wave absorbing material and the reflector for the electromagnetic wave absorption performance many times. And work can be performed efficiently with reduced labor. In addition, the procedure for measuring the radio wave absorption performance automatically proceeds, reducing measurement errors,
Measurement work of radio wave absorption performance can be performed quickly.

At the same time, the measured value of the radio wave absorbing material and the measured value of the reflector can be compared and evaluated, so that the measured value of the radio wave absorbing performance of the radio wave absorbing material can be reduced in error due to disturbance factors to further improve the measuring accuracy. In addition, it can be made more objective and appropriate, and the reliability of the measurement of the radio wave absorption performance can be improved.

Further, since the performance measuring system of the radio wave absorbing material can easily measure the radio wave absorbing performance,
It is suitable for measuring the radio wave absorption performance of a radio wave absorbing material such as a road constructed outdoors.

According to a third aspect of the present invention, in the performance measuring system for a radio wave absorbing material according to the first or second aspect, at each angular position with respect to the pair of transmitting antenna and receiving antenna set by the antenna setting means,
The control unit controls the measurement operation so that the measurement operation can be repeated a plurality of times.

With the above-described configuration, in addition to the functions and effects of the first or second aspect of the present invention, a plurality of measured values of the radio wave absorption performance of the radio wave absorbing material measured a plurality of times can be obtained. Based on this, it is possible to further reduce the error by reducing the variation, obtain an averaged measurement value, and improve the reliability of the measurement of the radio wave absorption performance.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the radio wave absorbing material performance measuring system of the present invention will be described below with reference to FIGS. As shown in the overall perspective views of FIGS. 1 to 3, the performance measuring device in the performance measuring system for a radio wave absorbing material according to the present embodiment includes a pair of a transmitting antenna 12 and a receiving antenna 14 on a support frame jig 10. Are attached in plural sets (three sets in the present embodiment).

FIGS. 1 to 3 show a pair of transmitting antennas 12 or receiving antennas 14 for easy understanding.
Only, and the illustration of the other two sets of transmitting antennas 12 or receiving antennas 14 is omitted.

The support frame jig 10 includes an arch member 16.
, The support foot member 18 and the two auxiliary beam members 20 are integrally assembled. As the arch member 16, for example, a laminated wood material having a rectangular cross section and a semicircular curved beam shape as a whole is used.

The arch member 16 may be made of a synthetic resin (FRP or the like) containing glass fiber or a metal pipe or angle material. Further, the supporting foot member 18 and the two auxiliary beam members 20 may be made of a wooden square material, a synthetic resin containing glass fiber (FRP or the like), a metal pipe or an angle material, or the like.

One end of a supporting foot member 18 is attached to a central portion corresponding to the vertex of the arch member 16, and the other end of the supporting foot member 18 and both ends of the arch member 16 are supported at three points. It is configured to stand in the state of.

Further, when the arch member 16 is placed upright on the plane of the radio wave absorbing material such as a road, the plane including the arc of the arch member 16 stands up at right angles to the plane of the radio wave absorbing material. The total length of the support foot member 18 is set so as to perform the above.

That is, the plane including the free ends of both feet of the arch member 16 and the free ends of the feet of the support foot member 18 is set to be in a state where it coincides with the plane of the road surface. (In other words, a line segment having a diameter connecting both ends of the arch member 16 is set so as to coincide with and pass on the road surface.) In this support frame jig 10, a plane including the arc of the arch member 16 is set. As shown in FIG. 4, one end of the supporting foot member 18 is notched obliquely to contact the central side surface of the arch member 16 so as to be able to firmly maintain the state where the supporting member stands upright at right angles to the plane of the radio wave absorbing material. The two bolts 22 and the nut 23 are fastened so as to form a rigid structure.

Thus, when the support member 18 is fastened to the arch member 16 and placed on the plane of the radio wave absorbing material, the plane including the arc of the arch member 16 is perpendicular to the plane of the radio wave absorbing material. Will stand up.

Further, reinforcing plates 24 are respectively provided on the upper and lower surfaces of the arch member 16 where the supporting foot member 18 is fastened.
With screws to increase the strength. It is needless to say that various other reinforcements may be applied in order to improve the strength of the fastening portion between the arch member 16 and the support foot member 18.

The intermediate portion of the arch member 16 may be configured to be detachable so that the arch member 16 can be divided into a plurality of portions, so that the arch member 16 can be used for carrying.

Further, in this embodiment, as shown in FIGS. 1 to 3, two auxiliary beam members 20 are attached to the arch member 16 as a reinforcing structure at a portion where the supporting foot member 18 is fastened.

The two auxiliary beam members 20 are installed as reinforcing beams extending between each portion near both ends of the arch member 16 and a portion near the free end of the supporting foot member 18.

As shown in FIG. 5, one end of each of the auxiliary beam members 20 is notched obliquely so as to abut on the inner peripheral surface of the arch member 16 and the bolt 22 and the nut 23 are used. To conclude.

Further, as shown in FIG. 6, the other ends of the auxiliary beam members 20 are notched obliquely at their respective ends so as to abut against the corresponding side surfaces of the support foot member 18, and
And the nut 23 integrally fasten these three members.

As described above, the arch member 16, the supporting foot member 18, and the two auxiliary beam members 20 are entirely formed in a three-dimensional rigid structure, and are merely mounted on the plane of the radio wave absorbing material. The plane including the arc of the arch member 16 can be set in a state of standing upright at right angles to the plane of the radio wave absorbing material.

In the measuring device of the performance measuring system of the present radio wave absorbing material shown in FIGS. 1 to 3 described above, both ends of the arch member 16 and the supporting foot member 1 are placed on the plane of the radio wave absorbing material.
Although the configuration that stands at three points with the end of the end portion 8 has been described, the present invention is not limited to this. The support state including the arch member 16 and the plurality of support foot members 18 is provided to support four points or more. It is good also as composition which stands.

For example, if a support foot member is separately installed on the arch member 16 symmetrically with the support foot member 18,
The state in which the arch member 16 has its plane including the arc standing upright at right angles to the plane of the radio wave absorbing material can be stably maintained without considering the weight balance of each part.

For example, three sets of the transmitting antenna 12 and the receiving antenna 14 are mounted on the arch member 16. In addition,
When an antenna is attached to the central portion, which is the vertex of the arch member 16, an antenna that functions as the transmitting antenna 12 and the receiving antenna 14 is attached.

Here, as illustrated in FIG.
In FIG. 6, one set of the transmitting antenna 12 and the receiving antenna 14 is set to 3
In the case of assembling, each of the transmitting antennas 12 or the receiving antennas 14 can be attached by an attaching structure as an attaching means illustrated in FIG.

In the mounting structure as the mounting means shown in FIG. 7, each transmitting antenna 12 or receiving antenna 14 is mounted on the arch member 16 using the mounting member 26, the bolt 22 and the nut 23.

For this reason, the mounting member 26 is formed by bending a metal piece into an L-shape in side view, and through holes 28 and 30 for fastening are respectively formed at predetermined positions on both plane portions.

The arch member 16 has a central angle of 30 degrees and a central angle of 30 degrees so that a vertical line is drawn down from a central position corresponding to the vertex and a vertex angle is centered on a point intersecting a line segment corresponding to the diameter of the arch member 16. 45 degrees, central angle 60
The radial line segment at each angle of degrees and the arch member 16
The fastening holes 32, which are through-holes through which the bolts 22 are inserted, are formed in correspondence with the respective intersection positions with the intersections.

Incidentally, four or more sets of the transmitting antenna 12 and the receiving antenna 14 may be attached to the arch member 16. In this case, a fastening hole 32 is formed in the arch member 16.
Are provided corresponding to four or more sets of the transmitting antenna 12 and the receiving antenna 14, respectively.

Then, one end of each mounting member 26 is brought into contact with the inner peripheral surface of the arch member 16 so that the fastening holes 32 and the through holes 2 are formed.
In the state where 8 is matched, the bolt 23 is inserted into these holes, the nut 23 is fitted, and the mounting member 26 is fastened to the arch member 16.

At this time, if a spacer 34 having a damper function is arranged between the side surface of the arch member 16 and the other end piece of the mounting member 26, the mounting member 26 can be positioned more appropriately with respect to the arch member 16. And a supporting structure that suppresses vibration when the transmitting antenna 12 or the receiving antenna 14 is attached to the other end piece of the attaching member 26 as described later.

As the transmission antenna 12 or the reception antenna 14 attached to the other end of the attachment member 26, a standard gain horn antenna having the same rectangular opening is used. The transmitting antenna 12 or the receiving antenna 14, which is a horn antenna, is provided with a pedestal 36 at a predetermined position on a side surface of the horn portion, and a mounting bolt 38 protruding from the upper surface thereof.

Then, the transmitting antenna 12 or the receiving antenna 14 passes the mounting bolt 38 through the through hole 30 formed in the other end piece of the mounting member 26, and fits the nut 23 to the mounting member 26.

As described above, the transmitting antenna 12 or the receiving antenna 14 is integrally mounted on each predetermined position of the arch member 16 by the member such as the mounting member 26.

Although not shown as another attachment means,
The arch member 16 can be manually slid on the circumference of the arch member 16 and can be fixed at an arbitrary position on the arch member 16 through a sliding mounting jig as mounting means.
The transmission antenna 12 and the reception antenna 14 may be attached to the antenna.

At the same time, on the side surface of the arch member 16,
A scale for displaying the mounting angle position of the transmitting antenna 12 or the receiving antenna 14 is provided.

Then, the slide mounting jig, to which the transmitting antenna 12 or the receiving antenna 14 is mounted, is read on a scale indicating the mounting angle position, and is manually moved on the arch member 16 to move to the desired angle position (regular position). (Reflection position).

Although not shown as another configuration of the mounting means, the above-mentioned sliding mounting jig may be configured as a self-propelled sliding holding device as the mounting means.

The sliding holding device as the mounting means is provided with the transmitting antenna 12 or the receiving antenna 14 mounted.
By being controlled by the control device, the arch member 16 automatically travels on its own circumference on the circumference thereof, and
6 so that it can be stopped at a required position and fixed.

In the case of this mounting means, for example, internal teeth or external teeth of gears are provided on the arch member 16 and a driving gear mounted on a sliding holding device is meshed with the teeth, and the driving gear is rotationally controlled. With such a configuration, the operation of moving the slide holding device to a desired position on the arch member 16 and stopping the slide holding device can be performed accurately and appropriately.

Each transmitting antenna 12 or receiving antenna 14 mounted on the arch member 16 by the mounting means.
Are set so as to face a predetermined radial direction (a direction toward the center of the semicircle) corresponding to the arch member 16 formed in a semicircular shape.

That is, as shown in FIG. 9, the radio wave emitted from each transmitting antenna 12 is reflected on the surface of the sample, and on an extension of the reflection angle of the same radio wave as the incident angle of the radio wave (in a state of regular reflection), It is set so that it is accurately incident on each receiving antenna 14 located at the same distance from the reflection point.

In the support frame jig 10, the arch member 1
Since the transmitting antenna 12 and the receiving antenna 14 are mounted on the side opposite to the side where the supporting foot member 18 in 6 is provided, the supporting foot member 18 may be easily lifted off the road surface and fall down. In such a case, it is desirable to add a weight to the portion of the support foot member 18 near the toe to prevent the support frame jig 10 from falling down.

In order to prevent the support frame jig 10 from overturning, it is desirable that the support foot member 18 itself has a heavy weight structure and further has a stable support structure by extending the support foot member 18.

Next, when assembling the arch member 16, the supporting foot member 18, and the two auxiliary beam members 20 integrally to form the supporting frame jig 10 having the minimum size, the dimensions of each member are set. A description will be given of a conditional expression for determining.

Here, as shown in FIGS. 8 and 9, the radius of the arch R (m), the radius of the open end of the antenna P (m), the 1/2 power beam width θ (degree), and the size of the sample Le (m) ) Defined as the distance T (m) from the tip of the support foot member 18 as the support and the arch.

Then, the sample size L is desirably 2λ × 2λ or more when the wavelength is λ, and is preferably a half power beam width or more from the viewpoint of securing the measurement dynamic range, so that Le ≧ 2Ptan θ It is calculated by the following equation.

The formula for calculating the distance T (m) from the center of the arch of the support from the sample size Le obtained by this formula is as follows.
From the condition of / (Le / 2) = R / (R−Le / 2), T ≧ RLe / (2R−Le), and the supporting frame jig 10 is set so as to satisfy this conditional expression.
If the radius of the arch member 16, the size of the supporting foot member 18, and the size of the two auxiliary beam members 20 are determined, the plane including the arc of the arch member 16 can be formed by simply assembling the respective members. And the supporting frame jig 10 having the minimum size can be configured.

In this embodiment, the radius R of the arch member 16 is specifically set to 1.3 m.

Transmission antenna 1 attached to arch member 16
2 or the radius P of the opening end of the receiving antenna 14 is 1.1 m.

The 1/2 power beam width θ is set to about 23 degrees. (It is assumed that a standard gain horn antenna is used and a radio wave in the frequency band of 5.8 GHz is used.) In this specific example, when a numerical value is substituted into the conditional expression Le ≧ 2Ptanθ, Le ≧ 2 × 1. 1 × 0.424 ≒ 0.93
m.

Therefore, the size of the sample is desirably 0.
93m or more is required.

Thus, for example, if the size of the reflector 40 as a sample is a square flat plate with a side of 1 m, the distance T (m) from the center of the semicircle of the arch member 16 to the free end of the foot of the supporting foot member 18 By substituting a numerical value into the conditional expression of T = RLe / (2R-Le), T = 1.3 × 1 / (2 × 1.3-1) = 0.8123 (m) That is, the above-described arch member 16 has a radius R of 1.3 m and T = 0.8123 (m).
8 and the length of the auxiliary beam member 20 may be determined.
In addition, the length of the support leg member 18 and the length of the auxiliary beam member 20 that correspond to the hypotenuse of the triangle are respectively 2
It is easily obtained from the value of the radius R of the arch member 16 corresponding to the side and the value of the distance T from the center of the semicircle of the arch member 16 to the free end of the foot of the supporting foot member 18 using the Pythagorean theorem. .

Here, the minimum size of the reflection plate 40 as a sample is 2λ × 2λ or more when the wavelength is λ. Here, when the frequency is 5.8 GHz, the wavelength λ
Since λ ≒ 0.05 m, the dimensions of the members constituting the support frame jig 10 may be set based on the dimensions for a flat plate of about 0.01 m ² .

Further, the support frame jig 10 is connected to the arch member 1.
6 and the supporting foot member 18 alone, the auxiliary beam member 20 does not interfere, so the distance T (from the center of the semicircle of the arch member 16 to the free end of the foot of the supporting foot member 18) m) may be set to T = Le / 2.

Further, at the time of manufacturing the support frame jig 10, the support frame jig 10 is supported at three points, both ends of the arch member 16 and the tip of the support foot member 18. Since the jig 10 is erected, the length of the foot between both ends of each arch member 16 and the tip of the supporting foot member 18 is adjusted, and the plane including the arc of the arch member 16 is made of the radio wave absorbing material. The support frame jig 10 is appropriately manufactured by adjusting the inclination of the support foot member 18 while watching the level so that the support frame jig stands upright at a right angle to the floor plane.

Further, in order to facilitate the manufacturing operation of the support frame jig 10 so that the arch member 16 stands upright with respect to the floor, the center of the semicircle of the arch member 16 is moved from the center of the foot of the support foot member 18. The distance T to the free end and the arch member 16
May be set to 3: 4: 5. With such a configuration, it can be understood that a right angle is obtained only by increasing these distances. Therefore, it is easy to make the plane including the arc of the arch member 16 stand at right angles to the floor plane of the radio wave absorbing material. Can be confirmed.

When the support frame jig 10 is manufactured, as a means for confirming that the plane including the arc of the arch member 16 is perpendicular to the floor plane of the radio wave absorbing material,
The following means can be used.

The first means is to place the support frame jig 10 on a horizontal plane and to set the vertex of the arch member 16 (arch member 16).
From the center point in the width direction of the center point of the arch member 16 so that the center of the weight is located on a point bisecting a line segment connecting the center positions in the width direction of both ends of the arch member 16. The length of the supporting foot member 18 is adjusted.

By adjusting the first means, the support frame jig 10 can be configured so that the plane including the arc of the arch member 16 stands at right angles to the horizontal plane.

The second means is provided with a laser beam emitting device which emits a laser beam along the central axis of the beam of the antenna, for example, to indicate the directional direction of the antenna to each of the transmitting antennas 12 or the receiving antennas 14. I do.

The laser beam emitted from the laser emitting device of the transmitting antenna 12 or the receiving antenna 14 disposed at the vertex of the arch member 16 to the floor plane and the transmitting points disposed at required locations on the arch member 16 are respectively determined. The support in the support frame jig 10 is adjusted so that the laser light emitted from the laser light emitting device of the antenna 12 or the reception antenna 14 irradiates the floor plane with the laser light (for example, the same state as illustrated in FIG. 9). The length of the foot member 18 or the assembling angle of each member is adjusted.

By the adjustment of the second means, the plane including the arc of the arch member 16 of the support frame jig 10 can be adjusted so as to stand upright at right angles to the horizontal or inclined plane.

Since the adjustment of the second means can be performed even on an inclined plane, after the support frame jig 10 is manufactured, the jig 10 must be adjusted on the road at the measuring site when the jig 10 is used, or the arch member 10 is used. It is also possible to perform an operation of confirming that the plane including the 16 arcs is in a state of standing upright at a right angle to the horizontal or inclined plane.

Further, since the direction of each transmitting antenna 12 or receiving antenna 14 can be actually set in the direction of regular reflection by the laser light emitting device attached to each transmitting antenna 12 or receiving antenna 14, the measurement accuracy can be further improved. .

Next, the configuration of the control unit of the measuring device in the performance measuring system for radio wave absorbing materials will be described with reference to FIG.

In this system for measuring the performance of radio wave absorbing materials, a measuring device 50 as a measuring means for oblique incidence performance measurement.
Then, a plurality of sets (K sets) of a pair of transmitting antennas 12 and receiving antennas 14 are connected via a switch 52 as an antenna setting means.

The measuring unit 50 and the switching unit 52 are connected to a control unit 54 which is a control means for controlling and operating them.

The control section 54 is connected to a measurement start switch 56, a switch 58 for specifying the presence or absence of a reflector, and a switch 60 for specifying the number D of measurement repetitions, for the operator to input a command.

The measuring device 50 in the performance measuring system for radio wave absorbing materials removes unnecessary waves by time domain measurement, measures the frequency response, and measures the received power level at the frequency to be measured.

The switch 52 connected to the measuring device 50
It has a switching function of selecting one set of the transmitting antenna 12 and the receiving antenna 14 located at mutually regular reflection positions and connecting to the measuring instrument 50.

The control unit 54 operates in accordance with a predetermined control program based on a command signal output from a measurement start switch 56, a reflector presence / absence designation switch 58, or a designation switch 60 for the number of measurement repetitions D operated by an operator. , The operation of the measuring device 50 and the switching device 52 is controlled.

Next, a description will be given of a method of using the measuring device in the performance measuring system for a radio wave absorbing material configured as described above.

The measuring device in the performance measuring system of the radio wave absorbing material shown in FIGS. 1 to 9 is an automatic toll collection station (expressway interface) of a toll road constructed by using a paved slab for preventing electromagnetic interference. And the like near the toll gate provided at the same location).

In this automatic toll collection system, although not shown, each of the automatic toll collection devices is disposed at a toll gate installed at a predetermined location on the road, corresponding to each traveling lane of the toll road.

This automatic toll collection device includes a vehicle detection radar and a radio communication device, and emits millimeter waves of the radar from the vehicle detection radar to a predetermined range in front of the toll gate. It detects that the vehicle has arrived at a predetermined position in front of the toll gate.

Further, when the automatic toll collection device detects a vehicle at a predetermined position on a road lane by a vehicle detection radar, the automatic toll collection device emits a communication signal from a wireless communication device of the automatic toll collection device. Send a signal to.

The vehicle is equipped with an automatic toll payment device, which receives a communication signal from the wireless communication device of the automatic toll collection device. Then, the automatic toll payment device transmits information (vehicle type, weight, model, registration number, etc.) necessary for collecting the toll of the vehicle by wireless communication.

The automatic toll collection device that has received the information necessary for discriminating the toll of the vehicle calculates the toll based on the mileage of the automobile on the toll road and executes the toll collection process.

In the above-described automatic toll collection system, at least a predetermined range in which a communication signal, which is a radio wave in a frequency band of 5.80 GHz, emitted from the wireless communication device of the automatic toll collection device is directed, An electromagnetic wave absorption function having a characteristic of absorbing low-intensity electromagnetic waves for communication, detection, or measurement of a road portion extending over a predetermined range irradiated with millimeter waves emitted from a vehicle detection radar of a toll collection device. Construction with a paved version having

As a result, the operation of wireless communication or vehicle detection is hindered by radio waves unnecessarily reflected on the road surface, thereby suppressing electromagnetic interference that hinders operations such as toll collection.

As described above, in order to reliably eliminate the electromagnetic wave interference, it is necessary to construct a pavement having a high performance for absorbing low-intensity electromagnetic waves for communication, detection, or measurement on site. It is necessary to measure the performance of absorbing the electromagnetic waves of the paved road by measuring the performance with a measuring device of the performance measuring system of the radio wave absorbing material.

However, in general, pavement roads are generally constructed such that the road surface is sloped downward toward one shoulder in order to improve drainage of rainwater or the like. Thus, even if the road surface is inclined, the transmitting antenna 12 and the receiving antenna 14
Must be properly set at the position of regular reflection.

Therefore, by properly and quickly setting the combination of the transmitting antenna 12 and the receiving antenna 14 to the position of the regular reflection using the support frame jig 10, the performance of absorbing the electromagnetic wave on the pavement road is improved. The work of measuring and confirming with the measuring device of the performance measuring system of the electromagnetic wave absorbing material can be easily performed.

That is, when the support frame jig 10 is placed on an inclined road surface, the support frame jig 10 supports three points of both ends of the arch member 16 and ends of the support foot members 18. Standing on a sloping road surface, the arch member 16
The plane including the circular arc of FIG. 4 stands upright at right angles to the plane of the radio wave absorbing material.

Therefore, the combination of the transmitting antenna 12 and the receiving antenna 14 mounted on the arch member 16 can be appropriately and promptly set to the regular reflection position as it is.

By using the support frame jig 10 as described above, the set of the transmitting antenna 12 and the receiving antenna 14 can be set at the position of regular reflection only by placing the support frame jig 10 on the road surface. Since the performance of the road as the radio wave absorbing material can be measured immediately, the efficiency of the measuring operation can be improved.

Further, since the support frame jig 10 can be configured compactly, it can be moved to various places such as near a shoulder on a road surface or near a building such as a toll gate, and installed as a radio wave absorbing material. Since the performance of the road can be measured, it is possible to measure the entire measurement area.

Further, since the support frame jig 10 is constructed by assembling the arch member 16, the support foot member 18, and the auxiliary beam member 20 using the bolt 22 and the nut 23, the support frame jig 10 It is also easy to disassemble into components. Therefore, if the support frame jig 10 is disassembled into each component, it is convenient for transportation by a vehicle, and it is also convenient to carry it to a distant place and perform a measurement operation.

Next, a description will be given of a measuring means when oblique incidence performance is measured by the performance measuring system for a radio wave absorbing material configured as described above. The measuring means of the radio wave absorbing material performance measuring system uses a reflector.

That is, as shown in FIGS. 1 to 3, a reflector 40 (for example, a metal plate) is placed on the surface of a test object (road surface), and the reflector 40, which is a sample to be measured, is transmitted from the transmitting antenna 12 to the reflector 40. Irradiates electromagnetic waves, receives the reflected waves generated by the receiving antenna 14, measures the frequency response with a measuring instrument, and in some cases, removes unnecessary radio waves by time domain measurement to measure the frequency response, and measures the frequency response. Measure the received power level of the frequency.

Further, the reflector 40 is removed, the electromagnetic wave is irradiated from the transmitting antenna 12 to the road as the radio wave absorbing material as the sample to be measured, and the reflected wave generated by the irradiation is received by the receiving antenna 14 and transmitted to the measuring instrument. To measure the frequency response, and in some cases, remove unnecessary radio waves by time domain measurement to measure the frequency response and measure the received power level of the frequency to be measured.

At this time, the received power level when the reflector 40 is installed is Lr (dB), and the received power level of the road (the road from which the reflector is removed) as a test object is Lm (dB).
Then, the reflectance L (dB) of the road is L = Lr-Lm
Can be compared and evaluated.

Note that this measurement is performed a plurality of times as necessary, and the reliability of the measurement results can be improved.

Next, a method for evaluating and measuring the performance of a radio wave absorber using a free space time domain method as one of the measuring means in the performance measuring system for a radio wave absorbing material will be described. This method of evaluating and measuring the performance of a radio wave absorber using the free space time domain method can be applied to a device having an electromagnetic wave frequency of 1.9 GHz or higher.

In the time domain method, not only the reflected wave of the target sample (road or reflector 40) but also the electromagnetic wave received by the receiving antenna 14 in the actual measurement is used.
Includes reflected waves and scattered waves from surrounding installations (for example, tollgate roofs and buildings) and electromagnetic waves that propagate directly from the transmitting antenna 12 to the receiving antenna 14. Suppression suppresses mainly the reflected wave of the target sample (road or reflector 40).

In the time domain method, based on the principle of transforming the characteristics of the frequency domain into the time domain by the inverse Fourier transform, the measurement characteristics of the frequency domain are converted to the time by the time domain function built in the network analyzer which is a measuring instrument. Convert to a domain.

Here, the reflected wave and the scattered wave from the surrounding installation object and the wave directly propagating to the receiving antenna are different in the propagation path from the reflected wave of the sample (road or reflector 40), so that the arrival time to the receiving antenna is different. Are different. That is, each wave will occur at a different time value in the time domain.

Therefore, in the time domain, only the reflected wave of the sample (road or reflector 40) is selected by gating, and the Fourier transform is performed to remove the influence of the reflected wave and scattered wave from the surrounding objects. The frequency characteristic of the reflected wave of the sample (road or reflector 40) obtained is obtained.

The main requirements for measuring the performance of the radio wave absorbing material by the time domain method are as follows. □ Measurement amount: Reflection coefficient (frequency, incidence / reflection angle, polarization parameter) □ Measuring device: Antenna: Use horn antenna.

Note that the wider the antenna used, such as a double-ridged guide antenna, the higher the measurement resolution, and the more the reflected wave of an object at a short distance can be separated.

Measuring device: A network analyzer having a time domain function is used.

A power amplifier is used if necessary.

Cable: A cable conforming to the impedance of a measuring instrument and an antenna is used. Low loss is desirable.

Reflector: The reflector 40 may be of any material and thickness as long as it is a metal plate having a predetermined area. Here, a square metal plate large enough to cover a half power beam width of the antenna is used as the reflector 40. □ Measurement environment: In the measurement space, there may be reflected waves and scattered waves from surrounding objects other than the reflected waves of the sample to be measured (road or reflector 40). If there is no difference in the propagation times to the receiving antennas, the separation is not completely performed. The measurement environment is selected in consideration of this point.

The measurement resolution in the time domain differs depending on the model of the network analyzer and its setting, but is given as 1.92 / measurement frequency span [sec] as an example.

The measurement frequency span is determined based on the specification band of the antenna. 4.2GHz measurement frequency span
Then, 0.46 ns is obtained, and the propagation distance corresponding thereto is 13.7 cm.

That is, a wave having a propagation distance difference of 13.7 cm or more from the reflected wave of the sample (road or reflector 40) can be separated and suppressed. □ Measurement incidence / reflection angle and polarization: The incidence / reflection angle shall be the same value (regular reflection). The following angles are measured at a minimum.

As for the polarization of 0 ° and 30 °, two types of incidence of TE and TM are performed. □ Measurement method: Installation of the measurement device: The transmission antenna 12 and the reception antenna 14 are installed at the position of regular reflection using the support frame jig 10 on the road to be measured according to the incident angle and the polarization. I do.

In the case of 0 ° incidence, the S parameter S ₁₁ (S ₂₂ ) is measured using only one antenna.

[0131] The distance between the road surface and the transmitting antenna 12 and the receiving antenna 14 is such that the radiated field from this antenna can be regarded as a far field. Assuming that the maximum dimension of the antenna aperture is D and the wavelength is λ, the antenna aperture may be 2D ² / λ or more.

The size of the measured portion of the road as a sample is 2
Desirably, the size is λ × 2λ or more and can cover a half power beam width of the antenna from the viewpoint of securing a measurement dynamic range.

Setting of Network Analyzer: It is not necessary to perform measurement calibration (vector error correction).

Frequency domain: measurement frequency span: set to the specified band of the antenna.

In a normal horn antenna, the band is determined by the size of the feed waveguide. For example, in the case of a WRJ-10 standard waveguide, the band is 8.2 to 12.4 GHz.

Number of data points per sweep: Determined in consideration of the measurable time area in the time domain.

Assuming that the distance (one way) from the cable length + the antenna to the sample (road or reflector 40) is S, the reflected wave of the sample (road or reflector 40) is approximately 2S / 3 × 10
Reach the network analyzer at ⁸ [sec] (assuming the propagation velocity in the cable is equal to free space, typically 67%). Therefore, the number of data points per sweep in the frequency domain needs to be 2S × measured frequency span / 3 × 10 ⁸ +1 or more.

S = 8 m, measurement frequency span 4.2 GHz
Then, the number of data points must be 225 or more. However, when the number of data points is increased, the measurement time becomes longer.

Time domain: Conversion mode from frequency domain to time domain: Set to time domain band pass mode.

Window: Preset settings of the network analyzer may be used.

Gate shape: Preset settings of the network analyzer may be used.

Measurement of the reflected wave level (Rm) of the reflector 40: The reflector 40 is installed on the road surface below the support frame jig 10. The time domain method removes reflected waves, scattered waves, and waves directly propagating to the receiving antenna from surrounding objects. The reflected wave level of the reflector 40 is measured. The dynamic range of the measurement is determined from this result, and if necessary,
The reflected wave level (R) for a road that has the ability to absorb electromagnetic waves as a sample to be reviewed for the measurement environment and measurement device
Measurement of s): The support frame jig 10 to which the transmitting antenna 12 and the receiving antenna 14 are mounted is installed at a place on the road surface where measurement is desired. Thereby, the transmitting antenna 12 and the receiving antenna 14 are respectively arranged at the positions of regular reflection.
In this state, the reflected wave level of a part of the road as the sample is measured. □ Measurement result: The reflection coefficient is obtained from the measurement value obtained as described above.

R = Rs / Rm where: R: Reflection coefficient Rs: Sample reflected wave level Rm: Reflected wave level of conductor flat plate (reflector 40) Next, the performance measuring system of the radio wave absorbing material configured as described above The case where the oblique incidence performance measurement is performed by controlling by the control unit will be described with reference to the flowchart of FIG.

In this case, for example, an operator moves a pair of the transmitting antenna 12 and the receiving antenna 1 to a position to be measured on a road constructed of a radio wave absorbing material as a test body.
A plurality of sets (K sets) are set in a state of regular reflection from each other.

At this time, the work can be easily performed by using the support frame jig 10 shown in FIGS. 1 to 9 described above.
At this time, a plurality of sets (K sets) of a pair of transmitting antennas 12 and receiving antennas 14 which are in regular reflection with each other at respective predetermined angular positions on the arch member 16 are set.

Next, the operator turns on the power of the entire radio wave absorbing material performance measuring system including the control unit 54. Then, the control unit 54 which has been in a standby state until the power is turned on in step 62 shown in the flowchart of FIG. 11 proceeds to step 64 and designates the designated number i of the pair of the transmitting antenna 12 and the receiving antenna 14 used for measurement. Is set to No. 1 so that the measurement can be executed using the first pair of the transmitting antenna 12 and the receiving antenna 14.

Further, at step 64, the control section 54 resets the number of measurements n when there is a reflector to zero, and resets the number of measurements q when there is no reflector to zero. It waits until the start switch 56 is turned on.

Next, the operator operates the designation switch 60 for the number D of times of measurement repetition, inputs the desired number of times of repetition of measurement in order to ensure the accuracy of the measurement, and instructs the control unit 54.

Next, the worker puts a test piece on the road surface,
The reflection plate 40 is provided. Thereafter, the worker operates the reflector presence / absence designation switch 58 to input a command to perform measurement when the reflector 40 is present, and instructs the controller 54 to perform the measurement.

Next, when the operator operates the measurement start switch 56, the control unit 54, which has been waiting at step 66, proceeds to step 68, controls the measuring device 50, and transmits the radio wave from the first transmitting antenna 12. Is emitted, reflected by the reflector 40 serving as a test object, and then received by the first receiving antenna 14 at the position of regular reflection, time domain measurement is performed, and the frequency response from which unnecessary waves are removed is measured. Then, the received power level of the frequency to be measured is measured, and the process proceeds to step 70.

In step 70, the contents of designation of the presence or absence of a reflector are determined, and if there is designation of the presence of a reflector, the process proceeds to step 72, where 1 is added to the number of measurements n when there is a reflector. Then, the process proceeds to a step 74, wherein Lrin
The measured value at step 68 is recorded at i = 1 and n = 1 in step, and the process proceeds to step.

In this step 76, it is determined whether or not the number of measurements n when there is a reflector is equal to the number D of measurement repetitions. Returns to step 66 and waits until the measurement start switch 56 is turned on by the operator.

During the standby at step 66, the worker operates the reflector 40 placed on the road surface as a test object.
Get rid of. Thereafter, the operator operates the reflector presence / absence designation switch 58 to input a command to perform measurement when the reflector 40 is not present (measurement of the radio wave absorbing material on the road) and instruct the control unit 54. .

Next, when the operator operates the measurement start switch 56, the control unit 54, which has been waiting at step 66, proceeds to step 68, controls the measuring device 50, and transmits the radio wave from the first transmitting antenna 12. Is emitted, reflected by a part of the road serving as a test object, received by the first receiving antenna 14 at the position of the regular reflection, time-domain measurement is performed, and the frequency response from which unnecessary waves are removed is obtained. It measures and measures the received power level of the frequency to be measured, and proceeds to step 70.

In step 70, the content of designation of the presence or absence of a reflector is determined. If there is designation of absence of a reflector, the process proceeds to step 78, where 1 is added to the number of measurements q when there is no reflector. Set, and proceed to step 80, where Lmi
The measured value in step 68 is recorded at the position of i = 1 and q = 1 in q, and the process proceeds to step 82.

In this step 82, it is determined whether or not the number of measurements q without the reflector is equal to the number of measurement repetitions D. If the number of measurements q without the reflector is less than the number of measurement repetitions D, it is determined. Returns to step 66 and waits until the measurement start switch 56 is turned on by the operator.

During the standby at step 66, the operator mounts the reflector 40 again on the road surface serving as a test object,
Further, by operating the reflector presence / absence designation switch 58, the controller 54 is instructed to perform measurement when the reflector 40 is present.

Next, the operator operates the measurement start switch 56 to execute steps 68 to 76 in the same manner as described above.
The above operations are performed, and the process waits at step 66.

Next, the worker operates the reflector 40 from above the road surface.
Is removed, and the presence / absence of a reflector plate switch 58 is operated to instruct the control unit 54 to perform measurement when the reflector plate 40 is not present.

Next, the operator operates the measurement start switch 56 to execute steps 78 to 82 in the same manner as described above.
The above operations are performed, and the process waits at step 66.

In the above control operation, it is determined in step 76 that the number of measurements n when there is a reflector is equal to the number D of measurement repetitions, and the process proceeds to step 84, or in step 82 the number of measurements q when there is no reflector is q Is repeated until it is determined that has reached the number D of measurement repetitions.

At this time, in addition to the procedure in which the measurement for the reflector 40 and the measurement for the road are alternately executed a required number of times, the worker performs the measurement for the reflector 40 continuously and executes the required number of times. The measurement operation may be performed according to a procedure in which the measurement is continuously performed a required number of times.

If it is determined in step 84 that both the number of measurements n with the reflector and the number of measurements q without the reflector have reached the number D of measurement repetitions in step 84, the process proceeds to step 86. .

In this step 86, the number of measurements n when there is a reflector is reset to 0, and the number of measurements q when there is no reflector is reset to 0, and the routine proceeds to step 88.

At step 88, the designated number i of the combination of the transmitting antenna 12 and the receiving antenna 14 used for measurement is
Is added to set the number to 2 so that the second set of the transmitting antenna 12 and the receiving antenna 14 can be used to perform the measurement, and the process proceeds to step 90.

Then, using the pair of the second transmitting antenna 12 and the receiving antenna 14 whose angle has been changed, the above-mentioned measurement when there is a reflector and when there is no reflector is repeated D times specified. If it is determined in step 84 that the measurement has been repeated, the number of measurements n when there is a reflector is reset to 0 in step 86, and the number of measurements q when there is no reflector is reset to 0. It is set to a number obtained by adding 1 to the designated number i of the combination of the transmitting antenna 12 and the receiving antenna 14 to be used.

Thus, the K-th transmitting antenna 1
Until the measurement is completed using the combination of the antenna 2 and the receiving antenna 14, the above-described control operation is repeatedly executed, and the process proceeds to step 90. At step 90, it is determined that all of the measurement work is completed, and the process proceeds to step 92. move on.

In step 92, Lrin (dB), which is the received power level when the reflector 40 is installed, and Lmiq (dB), which is the received power level when the road portion is tested, are accumulated by the measurement. Then, the reflectance L (dB) of the test sample is obtained by the following equation. L = Lrin-Ln
iq In addition, the processing of summing up the measurement results is executed by, for example, taking an average value of the values of the measurement values L for a plurality of times, the measurement results are output, and the control operation ends.

That is, by the control operation of the control unit 54 in the performance measuring system of the radio wave absorbing material, the transmitting antenna 12 as a set of regular reflections set at a plurality of angles is provided.
And the receiving antenna 14 are switched, and the measurement is performed a required number of times on the case where the reflector 40 is placed and on a part of the road, and the radio wave absorption performance in that part of the road is evaluated based on the measurement result.

The reflection coefficient R measured and evaluated as described above
Satisfies a predetermined standard, it can be confirmed that the road has been properly constructed so that the electromagnetic wave absorbing performance of the constructed road satisfies the standard. If the reflection coefficient R does not satisfy the predetermined criterion, the required portion of the constructed road is broken and the road is constructed again.

In the above-described embodiment, the measurement of the radio wave absorption performance of a road at an automatic toll collection point on a toll road has been described. However, the present invention is not limited to this. The measurement system is used to measure the road section to prevent electromagnetic interference from the vehicle driving support system by adding a lane marker for the vehicle driving support system, or to measure the performance of buildings constructed with other radio wave absorbing materials. Of course, it can be used.

When the oblique incidence performance measurement is performed by controlling the performance measuring system of the electromagnetic wave absorbing material by the control unit 54 as described above, as shown in FIGS.
Instead of using the support frame jig 10 for fixing the antenna 2 and the receiving antenna 14 to the arch member 16, a member in which a self-propelled sliding holding device is mounted on the arch member 16 may be used.

By controlling the drive by the control device with the transmitting antenna 12 or the receiving antenna 14 attached, the robot automatically travels on the circumference of the arch member 16 and moves automatically. When using the supporting frame jig 10 equipped with a self-propelled sliding holding device that can be stopped and fixed at a required position on the member 16, the control unit 54 controls the switching unit 52.
Instead of performing the switching control, the self-propelled sliding holding device as the antenna setting means may be used to control the transmission antenna 12 and the reception antenna 14 to move to the next predetermined angle position.

The switching antenna 52 controls the transmission antenna 1
2 and the receiving antenna 14 at the respective predetermined angular positions on the arch member 16 or the order in which the self-propelled sliding and holding device is moved to the respective predetermined angular positions. Alternatively, the order of the measurement work on the reflection plate 40 can be arbitrarily set.

[0175]

According to the system for measuring the performance of an electromagnetic wave absorbing material of the present invention, first, the control means controls the antenna setting means so that the pair of transmitting antennas and receiving antennas can be moved at different angles with respect to the electromagnetic wave absorbing material. The control means controls the measuring means while performing the operation of setting to the position of the regular reflection,
A radio wave is emitted from a transmitting antenna, reflected by a measuring object, received by a receiving antenna, and the performance of the measuring object absorbing the radio wave is automatically measured in order. Therefore, under the control of the control means, since the measurement work of the radio wave absorption performance can be automatically and repeatedly performed, the number of repetitive operations when the worker performs the measurement work of the radio wave absorption performance is reduced, and the labor is reduced. Work efficiency can be increased. In addition, since the work of measuring the radio wave absorption performance can be automatically advanced according to the procedure programmed by the control means, measurement errors can be reduced and the work of measuring the radio wave absorption performance can be performed quickly. Furthermore, since the performance measuring system of the radio wave absorbing material can easily measure the radio wave absorbing performance,
There is an effect that it is suitable for measuring the radio wave absorption performance of a radio wave absorbing material such as a road constructed outdoors.

Secondly, in the work of measuring the radio wave absorption performance, the work of measuring the radio wave absorption performance for the radio wave absorption material and the operation of measuring the radio wave absorption material in a state where the pair of transmitting antenna and the reception antenna are set at the respective angular positions are performed. Measuring the radio wave absorption performance of the reflector placed on the
When comparing and measuring the measured value for the electromagnetic wave absorbing material and the measured value for the reflecting plate, the measuring means automatically performs a control operation of executing the measuring operation of the electromagnetic wave absorbing material and the reflecting plate with respect to the electromagnetic wave absorbing material. Therefore, it is possible to reduce the number of repetitive operations when the operator performs the operation of measuring the electromagnetic wave absorbing performance on the electromagnetic wave absorbing material and the reflecting plate a number of times, thereby reducing labor and efficiently performing the operation. At the same time, it is possible to compare and evaluate the measured value for the radio wave absorbing material and the measured value for the reflector. This has the effect of being objective and appropriate and of improving the reliability of the measurement of the radio wave absorption performance.

Third, when the control means repeats the measurement operation a plurality of times at each angular position with respect to the pair of transmitting antenna and the receiving antenna set by the antenna setting means, the radio wave absorbing material is Based on multiple measured values of radio wave absorption performance measured multiple times, it is possible to reduce fluctuations, reduce errors, obtain an averaged measured value, and improve the reliability of radio wave absorption performance measurement There is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a performance measuring system for a radio wave absorbing material according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the entire configuration of the performance measuring system for a radio wave absorbing material according to the embodiment of the present invention, as viewed from another direction.

FIG. 3 is a perspective view showing the entire configuration of the performance measuring system for a radio wave absorbing material according to the embodiment of the present invention, as viewed from another direction.

FIG. 4 is an enlarged perspective view of a main part showing a fastening portion between the arch member and the support foot member in the performance measuring system for the radio wave absorbing material according to the embodiment of the present invention.

FIG. 5 is an enlarged perspective view of a main part showing a fastening portion between the arch member and the auxiliary beam member in the performance measuring system for the radio wave absorbing material according to the embodiment of the present invention.

FIG. 6 is an enlarged perspective view of a main part showing a fastening portion between the supporting foot member and two auxiliary beam members in the performance measuring system for the radio wave absorbing material according to the embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part showing a part where the antenna is fastened to the arch member via the mounting member in the performance measuring system of the radio wave absorbing material according to the embodiment of the present invention.

FIG. 8 is a schematic explanatory diagram for explaining a configuration in which the reflector and the auxiliary beam member do not interfere with each other in the performance measuring system for a radio wave absorbing material according to the embodiment of the present invention.

FIG. 9 is an overall schematic perspective view showing a state where three sets of antennas are arranged on an arch member in the performance measuring system for a radio wave absorbing material according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a connection configuration for control in the performance measuring system for an electromagnetic wave absorbing material according to the embodiment of the present invention.

FIG. 11 is a block diagram showing a control operation for measurement in the performance measuring system for a radio wave absorbing material according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 support frame jig 12 transmitting antenna 14 receiving antenna 16 arch member 18 supporting foot member 20 auxiliary beam member 26 mounting member 40 reflector 50 measuring device (measuring device) 52 switching device (antenna setting device) 54 control unit (control device) 56 Measurement start switch 58 Reflection plate presence / absence designation switch 60 Measurement repetition count D designation switch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenichi Harakawa 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Toshio Saito 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Takeshi Kunishima 8-21-1, Ginza, Chuo-ku, Tokyo Inside (72) Inventor Kenichi Yoshimura 8-21 Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Road

Claims (3)

[Claims] 1. A pair of transmission antenna and reception antenna, which can be set at mutually different regular reflection positions at different angles with respect to a radio wave absorbing material, and a radio wave is emitted from the transmission antenna and reflected on a measurement object. After that, the receiving means receives the signal, the measuring means for measuring the performance of the object to absorb radio waves, and the pair of transmitting antennas and receiving antennas are at different regular reflection angles with respect to the radio wave absorbing material. An antenna setting means for selectively setting a set state; and a pair of transmitting antennas, while automatically performing sequential control to automatically change the angular positions of the pair of transmitting antennas and receiving antennas set by the antenna setting means. And control means for controlling when the receiving antenna is set at each angular position to perform the work of measuring the radio wave absorption performance. Performance measurement system of the radio wave absorbing material according to claim. 2. A pair of transmitting antenna and receiving antenna, which can be set at mutually different regular reflection positions at different angles with respect to the radio wave absorbing material, and a radio wave is emitted from the transmitting antenna and reflected on a measurement target. After that, the receiving means receives the signal, the measuring means for measuring the performance of the object to absorb radio waves, and the pair of transmitting antennas and receiving antennas are at different regular reflection angles with respect to the radio wave absorbing material. An antenna setting means for selectively setting a set state; and a pair of transmitting antennas, while automatically performing a control to automatically sequentially change the angular positions of the pair of transmitting antennas and receiving antennas set by the antenna setting means. In a state where the receiving antenna is set at each angular position, a measurement operation of the radio wave absorbing material with respect to the radio wave absorbing material, and mounting on the radio wave absorbing material And control means for performing a measurement operation of the radio wave absorption performance for the reflecting plate, and controlling the measured value for the radio wave absorbing material and the measured value for the reflecting plate so that they can be compared and evaluated. Performance measurement system for radio wave absorbing materials. 3. The method according to claim 1, wherein the control unit controls the angle so as to be able to repeat the measurement operation a plurality of times at respective angular positions with respect to the pair of transmitting antennas and receiving antennas set by the antenna setting unit. The performance measuring system for a radio wave absorbing material according to claim 1 or 2.