Calibrating device for frequency-selecting electromagnetic radiation instrument

Abstract

The utility model relates to the technical field of measurement, in particular to a calibration device for a frequency-selecting electromagnetic radiation instrument. The device comprises a signal generator, a power amplifier, a directional coupler, a power meter, a horn antenna, a laser range finder, a computer and a clamp device, a field intensity probe of the electromagnetic radiation analyzer is fixed on the clamp device, the computer is connected with the clamp device, and the clamp device comprises a high-precision rotary table and a supporting clamp; the high-precision rotary table comprises an X-direction moving platform and a Z-direction rotating platform, the supporting clamp comprises a Z-direction lifting adjusting mechanism, a 54.7-degree rotating table device and an X-axis rotating adjusting device, the Z-direction rotating platform is arranged on the X-direction moving platform, the Z-direction lifting adjusting mechanism is arranged on the Z-direction rotating platform, the 54.7-degree rotating table device is detachably arranged on the Z-direction lifting adjusting mechanism, and the Z-axis rotating adjusting device is arranged on the Z-direction lifting adjusting mechanism. The adjusting device rotating around the X axis is detachably arranged on the Z-direction lifting adjusting mechanism. According to the utility model, the requirement of high-precision calibration can be met in the parameter calibration process of the frequency-selecting electromagnetic radiation instrument.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a calibration device for a frequency-selective electromagnetic radiation instrument. Background Art

[0002] With the increasing use of electronic and communication equipment, electromagnetic waves of various frequencies and energies are flooding every corner of the earth and even the vast universe. When electromagnetic waves act on the human body, part of them are absorbed by the body. When the absorbed electromagnetic wave energy reaches a certain intensity, it will cause the body to heat up. If it exceeds a certain limit, the human body will have a high temperature physiological reaction, which is harmful to human health.

[0003] The impact of electromagnetic radiation on humans is related to factors such as radiation intensity, frequency, duration of action, and environment. The greater the radiation intensity, the longer the duration of action on the human body, and the higher the frequency, the greater the impact. It has been concluded that a certain degree of electromagnetic radiation is harmful to the human body and is a major enemy to human health. Therefore, the problem of electromagnetic radiation environment has received widespread attention. The World Health Organization lists electromagnetic radiation pollution as the fourth largest pollution after water, air, and sound. The United Nations Conference on the Human Environment has also listed it as one of the environmental protection projects. Countries around the world attach great importance to the increasingly complex electromagnetic environment and its impact. Electromagnetic environmental protection has become a rapidly developing new discipline. In order to protect the environment, protect human health, and ensure information security, electromagnetic radiation must be protected. Protection from electromagnetic radiation pollution is urgent.

[0004] At present, although major research institutions and metrology and calibration units are conducting research on the calibration method of frequency-selective electromagnetic radiation meters, no comprehensive research and exploration has been conducted. The content and method of calibration are mainly based on IEEE 1309-2013. However, IEEE1309-2013 is a calibration method for field strength probes used in electromagnetic compatibility testing, while frequency-selective electromagnetic radiation analyzers are used for environmental electromagnetic radiation monitoring. The application scenarios and environments of the two are different, and the design principles and methods of the two are also different. Therefore, it is biased to calibrate the frequency-selective electromagnetic radiation analyzer completely in accordance with the IEEE 1309-2013 specification. The calibration of frequency measurement accuracy should be increased, and at the same time, the calibration methods and steps of parameters such as field strength measurement accuracy, frequency response, isotropy, etc. should be changed, and the data recording method should be changed, etc.

[0005] At present, the types of frequency-selective electromagnetic radiation meter field strength probes are different, and there are great difficulties in calibrating the isotropic parameters of the field strength probes. The existing metrological calibration devices are not accurate enough in the calibration process of some parameters. Therefore, a frequency-selective electromagnetic radiation meter calibration device that can take into account parameters such as isotropy is needed to improve the accuracy of the metrological calibration device in the calibration process of various parameters. Utility Model Content

[0006] In order to solve the technical problems existing in the prior art, the utility model provides a frequency-selective electromagnetic radiation meter calibration device. By adjusting the position of the field strength probe by using a high-precision turntable and a clamp device, the field strength probe can be calibrated and rotated according to the specified placement position and angle, which greatly improves the accuracy of the calibration data, thereby improving the accuracy of the measurement and calibration device in the calibration process of various parameters.

[0007] The utility model adopts the following technical solutions to achieve:

[0008] A frequency-selective electromagnetic radiation instrument calibration device comprises a signal generator, a power amplifier, a directional coupler, a power meter, a horn antenna, a laser rangefinder, a computer and a fixture device. The field intensity probe of the electromagnetic radiation analyzer is detachably arranged on the fixture device, and the computer is connected to the fixture device; the laser rangefinder is used to calibrate the position of the quasi-horn antenna and the position of the field intensity probe, so that the position of the horn antenna and the position of the field intensity probe are located on the same straight line;

[0009] The fixture device is used to adjust the X-axis position, vertical position, rotation around the 54.7° axis and rotation around the X-axis of the field strength probe; the fixture device includes a high-precision turntable and a supporting fixture, the high-precision turntable includes: an X-axis moving platform and a Z rotating platform, the supporting fixture includes a Z-axis lifting adjustment mechanism, a 54.7° rotating table device and an X-axis rotation adjustment device, the Z rotating platform is arranged on the X-axis moving platform, the Z-direction lifting adjustment mechanism is arranged on the Z rotating platform, the 54.7° rotating table device can be detachably arranged on the Z-direction lifting adjustment mechanism, and the X-axis rotation adjustment device can be detachably arranged on the Z-direction lifting adjustment mechanism.

[0010] Specifically, the X-axis moving platform includes: the X-axis moving platform includes an aluminum alloy base, a precision guide rail slider, a drag chain, and a motor. The motor is arranged on the aluminum alloy base, and a precision guide rail is arranged on the aluminum alloy base. The precision guide rail slider moves in the X direction on the precision guide rail, and the motor and the precision guide rail slider are connected by a drag chain drive.

[0011] Specifically, the Z rotating platform includes: a Z-axis base, a Z-axis rotary table support, a motor and a wave-absorbing baffle. The Z-axis base is fixed on a precision guide rail slider. The Z-axis rotary table support and the motor are arranged on the Z-axis base. The Z-axis rotary table support and the motor are connected by transmission. A wave-absorbing baffle is arranged around the Z-axis rotary table support and the motor, and a wave-absorbing material is arranged on the wave-absorbing baffle.

[0012] Specifically, the Z-direction lifting adjustment mechanism comprises: a Z-direction adjustment rod and an adjustment rod locking structure. The adjustment rod locking structure is connected to the rotary table support, and the Z-direction adjustment rod moves in the Z direction on the adjustment rod locking structure.

[0013] Specifically, the 54.7° rotary table includes: a support seat, a 54.7° rotary table support, a motor, an electric rotary table and a replaceable fixture. The support seat is detachably connected to the Z-axis lifting and lowering adjustment mechanism. The 54.7° rotary table support is arranged on the support seat. The motor and the electric rotary table are both arranged on the rotary table support. The motor and the electric rotary table are connected in transmission. The electric rotary table rotates around the 54.7° axis, and the electric rotary table is connected to the replaceable fixture.

[0014] Specifically, the rotation adjustment device around the X-axis includes: the rotation adjustment device around the X-axis includes: a horizontal support, a belt, a pulley, an X-axis rotation motor, the horizontal support is detachably connected to the Z-axis lifting adjustment mechanism, a pulley is provided on the horizontal support, the pulley rotates around the X-axis, an X-axis interchangeable fixture is provided on the pulley, and the X-axis interchangeable fixture is vertically installed with the Z-axis lifting adjustment mechanism.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The utility model provides a frequency-selective electromagnetic radiation meter calibration device, which is provided with a fixture device, including a high-precision turntable and a supporting fixture, which are used to adjust the X-direction position, vertical position, rotation around a 54.7° axis and rotation around the X-axis of a field strength probe. The position and steering degree of the field strength probe are accurately controlled by the high-precision turntable and the supporting fixture, so as to achieve the effect of accurately measuring parameters such as the electric field strength, dynamic range, isotropy, linearity, frequency error, and frequency response of the frequency-selective electromagnetic radiation analyzer, so that the frequency-selective electromagnetic radiation analyzer can be effectively traced back to the national standard, and the accuracy of the measurement and calibration device in the calibration process of various parameters is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a frequency-selective electromagnetic radiation analyzer in an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the field intensity probe 54.7° placement implementation in the embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the overall structure of the frequency-selective electromagnetic radiation instrument calibration device in the embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of a high-precision turntable plus a Z-direction lifting and lowering adjustment mechanism in an embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of a high-precision turntable plus a 54.7° rotating table device in an embodiment of the utility model;

[0022] Figure 6 It is a schematic diagram of a high-precision turntable plus an adjustment device for rotating around the X-axis in an embodiment of the utility model;

[0023] The numbers in the figure are: 11-field strength probe, 12-frequency selective electromagnetic radiation analyzer host, 13-Z-axis antenna, 14-Y-axis antenna, 15-X-axis antenna, 16-data interface, 17-RF interface, 21-X-axis moving platform, 22-Z rotating platform, 23-Z-axis lifting adjustment mechanism, 231 adjusting rod locking structure, 232-Z-axis adjusting rod, 24-54.7° rotating table device, 241-support seat, 242-54.7° rotating table support, 243-electric rotating table, 244-interchangeable fixture, 25-rotation adjustment device around X-axis, 251-horizontal support, 252-pulley, 253-belt, 254-X-axis interchangeable fixture. DETAILED DESCRIPTION

[0024] The following will further describe the technical solution of the utility model in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them, and the implementation methods of the utility model are not limited thereto. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] as follows Figure 1 As shown, the structure diagram of the frequency-selective electromagnetic radiation analyzer is composed of a field strength probe (measurement antenna) 11 and a frequency-selective electromagnetic radiation analyzer host 12. The antenna of the field strength probe is a three-axis omnidirectional antenna, that is, three orthogonal dipole antennas, namely, a Z-axis antenna 13, a Y-axis antenna 14 and an X-axis antenna 15. The three antennas are assembled together in a mutually perpendicular manner. The three-axis omnidirectional antenna has a data interface 16 and a radio frequency interface 17. The output of the three-axis omnidirectional antenna is a coaxial radio frequency line. The host selects the antenna used for measurement through a radio frequency electronic switch control, that is, only one of the antennas is selected at the same time to connect to the radio frequency line and output to the measurement host through the radio frequency interface 17. The measurement host is a spectrum analyzer. The angles between the RF line and the three dipole antennas are also 54.7°. During measurement, the measurement host controls the X, Y, and Z axis antennas in sequence, and obtains the spectrum of each antenna through frequency sweep measurement. The X component spectrum, Y component spectrum, and Z component spectrum of the measured electric field are measured in sequence. Finally, these three components are combined into a total spectrum in the host, and the measured field strength spectrum is obtained after introducing antenna factor correction.

[0026] Frequency radiation meter is usually equipped with spectrum analyzer or test receiver, and frequency selective radiation meter is used to measure low-level electric field strength, electromagnetic compatibility and electromagnetic interference in the environment. In addition to the field strength meter (or interference field strength meter), the measurement system composed of receiving antenna and spectrum analyzer or test receiver can be used for environmental electromagnetic radiation measurement after calibration.

[0027] Frequency-selective electromagnetic radiation analysis mainly requires measurement and calibration of parameters such as electric field strength, dynamic range, isotropy, linearity, frequency error, field strength probe detection limit, and frequency response.

[0028] The electric field strength calibration includes the following steps:

[0029] Connect the instruments to form a calibration system, power on the instruments, and preheat them for the time specified in the technical manual;

[0030] Place the geometric center of the calibrated electric field strength probe at the reference point on the main axis of the transmitting antenna in the microwave darkroom, and ensure that the probe handle is perpendicular to the electric field vector and the propagation vector direction, and set the electric field strength probe to the working state of the switch on;

[0031] Set the signal generator frequency to the calibration frequency point;

[0032] Adjust the output level of the signal generator and the gain of the power amplifier so that the electric field strength at the reference point is the standard electric field strength value, which can be obtained by the following formula. Record the power meter indication and the standard electric field strength value at this time;

[0033] At each frequency, the object rotates 60° around the handle axis, and after each stop, the integrated field strength value Ei is recorded. After a complete rotation of 360°, the measured value of the field strength is recorded.

[0034] The isotropic calibration includes the following steps:

[0035] Place the electric field strength probe at the reference point and adjust the direction of the electric field strength probe so that one of the field sensors is in the same direction as the incident electric field vector. This can be achieved by placing the handle of the electric field strength probe along the diagonal of the cube, such as Figure 2 As shown, the schematic diagram of the field strength probe being placed at 54.7° is shown.

[0036] Set the signal generator frequency to the calibration frequency point, adjust the output level of the signal generator and the gain of the power amplifier so that the electric field strength at the reference point is the standard electric field strength value, and record the calibration frequency point and the standard field strength value.

[0037] The electric field strength probe is rotated 360° around the rotation axis with a maximum rotation step of no more than 30° to obtain a set of field strength probe response indications. All electric field strength probe response indications are recorded to find the maximum and minimum response indications; finally, the isotropy of the electric field strength probe is calculated.

[0038] Example 1

[0039] like Figure 3-6As shown, the frequency-selective electromagnetic radiation meter calibration device described in the utility model includes a signal generator, a power amplifier, a directional coupler, a power meter, a horn antenna, a laser rangefinder, a computer and a fixture device. The field intensity probe of the electromagnetic radiation analyzer can be detachably arranged on the fixture device, and the computer is connected to the fixture device; the laser rangefinder is used to calibrate the position of the quasi-horn antenna and the position of the field intensity probe, so that the position of the horn antenna and the position of the field intensity probe are located on the same straight line.

[0040] Specifically, the signal generator is used to emit a standard continuous wave signal; the power amplifier is used to amplify the power of the standard continuous wave signal; the dual directional coupler is used to detect the forward and reverse signals fed into the horn antenna; the power meter includes a first power meter and a second power meter, which are used to measure the power of the forward and reverse signals detected by the dual directional coupler and calculate the net power fed into the horn antenna. The power output to the horn antenna by the directional coupler will be partially reflected back, and the output and reflected power can be monitored to directly calculate the net power fed into the horn antenna. The horn antenna is used to convert the signal from the traveling wave transmitted by the cable to a spherical wave that can be propagated in the air; the field intensity probe of the frequency-selective electromagnetic radiation analyzer receives the standard spherical wave signal transmitted from the horn antenna, and the laser rangefinder is used to calibrate the position of the quasi-horn antenna and the position of the field intensity probe, so that the position of the horn antenna and the position of the field intensity probe are located on the same straight line; the computer is used to control the high-precision turntable to move the front and rear position and rotation angle of the field intensity probe.

[0041] The fixture device is used to control the field intensity probe to move in the X-axis position, move in the Z-axis vertical position, rotate around the 54.7° axis and rotate around the X-axis. The center of the field intensity probe is aligned with the electric field through the fixture device (it can move horizontally along the guide rail and can be adjusted up and down), and a 45° circular angle and a 54.7° axial angle can be fixedly clamped. The alignment operation of the center of the field intensity probe and the electric field is performed by calibrating the electromagnetic wave propagation trajectory through a laser rangefinder, so that the spherical wave output by the horn antenna can be completely received by the antenna field intensity probe under ideal conditions. Isotropic measurement can rely on controlling the forward, backward, and steering operations of the frequency-selective electromagnetic radiation analyzer. After alignment with the laser rangefinder, the field intensity probe of the frequency-selective electromagnetic radiation analyzer can completely receive the electromagnetic wave signal emitted by the horn antenna. All of the above processes are subject to value transfer and traceability.

[0042] The fixture device includes a high-precision turntable and a supporting fixture. The high-precision turntable includes: an X-axis moving platform 21, a Z rotating platform 22, and the supporting fixture includes a Z-axis lifting adjustment mechanism 23, a 54.7° rotating table device 24 and an X-axis rotation adjustment device 25.

[0043] The X-direction mobile platform 21 is used to control the field strength probe to move left and right along the X direction. The computer controls the motor to change. When the field strength probe reaches the predetermined position, the X-direction mobile platform is locked. The X-direction mobile platform includes an aluminum alloy base, a precision guide rail slider, a drag chain, and a motor. The motor is arranged on the aluminum alloy base, and a precision guide rail is arranged on the aluminum alloy base. The precision guide rail slider moves in the X direction on the precision guide rail, and the motor and the precision guide rail slider are connected by a drag chain drive. The X-direction mobile platform also includes a locking structure, which is used to lock the X-direction position of the precision guide rail slider and prevent the precision guide rail slider from moving. Specifically, the computer can be used to control the motor to drive the drag chain, and the drag chain drives the precision guide rail slider to move. The locking structure can be a limiter, and the motor adopts an asynchronous motor. The asynchronous motor power supply voltage range is DC24V-50V, and the current is 5A. Preferably, the aluminum alloy base of the X-direction mobile platform is provided with adjustable feet and caster supports, which are convenient for movement and installation.

[0044] The Z rotating platform 22 includes a Z-direction base, a Z-direction rotary table support, a motor and a wave-absorbing baffle. The Z-direction base is fixed on a precision guide rail slider, the Z-direction rotary table support and the motor are arranged on the Z-direction base, the Z-direction rotary table support and the motor are connected by transmission, and a wave-absorbing baffle is arranged around the Z-direction rotary table support and the motor, and a wave-absorbing material is arranged on the wave-absorbing baffle. The Z-direction lifting and adjusting mechanism is connected to the rotary table support, and the motor movement change can be controlled by a computer to control the Z-direction lifting and adjusting mechanism to rotate 0 to 360 degrees around the Z axis, so that the field strength probe on the lifting and adjusting mechanism can rotate 0 to 360 degrees around the Z axis and self-lock in place.

[0045] The absorbing baffle is a hard baffle made of low dielectric constant material, which is used to surround the entire base and provide a reliable support surface for the absorbing material; the absorbing material is made of hard polystyrene and is used to absorb electromagnetic waves. The use of high hardness and low dielectric constant materials as the main support structure not only ensures the structural strength and can well support various types of probes, but also ensures that the main support structure will not disturb the electromagnetic field environment and affect the test results.

[0046] The Z-axis lifting adjustment mechanism 23 includes an adjustment rod locking structure 231 and a Z-axis adjustment rod 232. The adjustment rod locking structure 231 is connected to the rotary table support, and the Z-axis adjustment rod 232 is connected to the adjustment rod locking structure 231. The top of the Z-axis adjustment rod can fix the field intensity probe. The field intensity probe can be adjusted up and down along the Z direction, and the adjustment rod locking structure can be manually adjusted to lock it in place. When calibrating the test field intensity value, frequency response, isotropy, etc., the height of the probe can be adjusted to be consistent with the height of the transmitting antenna through the Z-axis lifting adjustment mechanism.

[0047] The 54.7° rotating table 24 includes: a support seat 241, a 54.7° rotating table support 242, a motor, and an electric rotating table 243. The support seat 241 is detachably connected to the Z-axis lifting and lowering adjustment mechanism 23. The 54.7° rotating table support is arranged on the support seat. The motor and the electric rotating table are both arranged on the rotating table support. The motor and the electric rotating table are connected in transmission. The electric rotating table rotates around the 54.7° axis. A 54.7° replaceable fixture is arranged on the electric rotating table. The field strength probe is fixed by the 54.7° replaceable fixture. The horizontal angle of the replaceable fixture is 54.7°. When calibrating the test field strength value, frequency response, isotropy, etc., the probe is tilted and calibrated at an angle of 54.7° through the 54.7° rotating table. The field strength probe can rotate around the 54.7° axis, with a rotation range of 0 to 360°. The computer controls the motor change and it is self-locking in place.

[0048] The X-axis rotation adjustment device 25 includes: a horizontal support 251, a pulley 252, a belt 253, and an X-axis rotation motor. The horizontal support is detachably connected to the Z-axis lifting adjustment mechanism. The horizontal support is provided with a pulley, which rotates around the X-axis. The pulley is provided with an X-axis replaceable fixture 254, which is vertically installed with the Z-axis lifting adjustment mechanism. The X-axis replaceable fixture 254 is used to fix the field intensity probe. The motor changes are controlled by a computer to realize the rotation of the field intensity probe around the X-axis, with a rotation range of 0 to 360 degrees and self-locking in place.

[0049] In summary, the fixture device of the utility model has adjustable feet and caster supports as a whole, which is convenient for movement and installation and fixing; the field strength probe can be moved left and right along the X direction through the X-direction platform, and the computer controls the motor to change and lock it in place; the field strength probe can be rotated 0 to 360 degrees around the Z axis through the Z-direction lifting and adjusting mechanism, and the field strength probe can be adjusted up and down along the Z direction through manual adjustment, and locked in place; the field strength probe can be rotated around the 54.7° axis through the 54.7° rotating table device, and the rotation range is 0 to 360 degrees; the field strength probe can be rotated around the X axis through the X-axis rotation adjustment device, and the rotation range is 0 to 360 degrees, and the computer controls the motor to change and self-lock in place; different fixtures are equipped according to different field strength probes to meet the use requirements of different field strength probes; the field strength probe can be moved left and right along the support seat, and cooperated with the Z-direction rotation to meet the use requirements of the field strength probe center and the X-direction guide rail center axis coincidence. By controlling the high-precision turntable and supporting fixture by computer, the rotation and position movement of the field strength probe can be accurately controlled. By coordinating with the automatic test system and setting the operation instructions on the computer side, all the parameters to be measured of the frequency-selective electromagnetic radiation analyzer can be completed.

[0050] The utility model can be adapted to all commonly used types of probes, ensuring that all probes can be calibrated and rotated according to the specified placement and angle, greatly improving the accuracy and rigor of the calibration data; electric adjustment does not require manual adjustment, and during the test process (in the presence of electromagnetic field radiation), the movement and rotation of the probe can also be controlled (to protect the human body from electromagnetic field damage); the isotropic calibration speed is greatly improved, which used to require manual adjustment, but now uses electric adjustment, and the calibration time is shortened from the original 25 to 30 minutes to 4 minutes, thereby improving the calibration efficiency.

[0051] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A frequency-selective electromagnetic radiation instrument calibration device, characterized in that: It includes a signal generator, a power amplifier, a directional coupler, a power meter, a horn antenna, a laser rangefinder, a computer and a fixture device, and the computer is connected to the fixture device; the laser rangefinder is used to calibrate the position of the quasi-horn antenna and the position of the field intensity probe, so that the position of the horn antenna and the position of the field intensity probe are located on the same straight line; The fixture device is used to control the field strength probe to move in the X-direction position, move in the Z-direction vertical position, rotate around the 54.7° axis and rotate around the X-axis; the fixture device includes a high-precision turntable and a supporting fixture, the high-precision turntable includes: an X-direction moving platform and a Z rotating platform, the supporting fixture includes a Z-direction lifting adjustment mechanism, a 54.7° rotating table device and an X-axis rotation adjustment device, the Z rotating platform is arranged on the X-direction moving platform, the Z-direction lifting adjustment mechanism is arranged on the Z rotating platform, the 54.7° rotating table device can be detachably arranged on the Z-direction lifting adjustment mechanism, and the X-axis rotation adjustment device can be detachably arranged on the Z-direction lifting adjustment mechanism.

2. A frequency-selective electromagnetic radiation meter calibration device according to claim 1, characterized in that: The X-direction moving platform comprises: an aluminum alloy base, a precision guide rail slider, a drag chain and a motor. The motor is arranged on the aluminum alloy base, a precision guide rail is arranged on the aluminum alloy base, the precision guide rail slider moves in the X direction on the precision guide rail, and the motor and the precision guide rail slider are connected by a drag chain drive.

3. A frequency-selective electromagnetic radiation meter calibration device according to claim 2, characterized in that: The Z rotating platform comprises: a Z-direction base, a Z-direction rotary table support, a motor and a wave-absorbing baffle. The Z-direction base is fixed on a precision guide rail slider. The Z-direction rotary table support and the motor are arranged on the Z-direction base. The Z-direction rotary table support and the motor are connected by transmission. A wave-absorbing baffle is arranged around the Z-direction rotary table support and the motor, and a wave-absorbing material is arranged on the wave-absorbing baffle.

4. A frequency-selective electromagnetic radiation meter calibration device according to claim 3, characterized in that: The Z-direction lifting adjustment mechanism comprises: an adjustment rod locking structure and a Z-direction adjustment rod, the adjustment rod locking structure is connected to the rotary table support, and the Z-direction adjustment rod moves in the Z direction on the adjustment rod locking structure.

5. The frequency-selective electromagnetic radiation meter calibration device according to claim 3, characterized in that: The 54.7° rotating table includes: a support seat, a 54.7° rotating table support, a motor, an electric rotating table and a replaceable fixture. The support seat is detachably connected to the Z-axis lifting and lowering adjustment mechanism. The 54.7° rotating table support is arranged on the support seat. The motor and the electric rotating table are both arranged on the rotating table support. The motor and the electric rotating table are connected in transmission. The electric rotating table rotates around the 54.7° axis, and the electric rotating table is connected to the replaceable fixture.

6. The frequency-selective electromagnetic radiation meter calibration device according to claim 3, characterized in that: The rotation adjustment device around the X-axis includes: a horizontal support, a belt, a pulley, and an X-axis rotation motor. The horizontal support is detachably connected to the Z-direction lifting and adjusting mechanism. A pulley is provided on the horizontal support, and the pulley rotates around the X-axis. An X-direction replaceable fixture is provided on the pulley, and the X-direction replaceable fixture is installed vertically to the Z-direction lifting and adjusting mechanism.

Images