CN108152600B - Device and method for measuring curved surface local shielding efficiency of electromagnetic shielding clothes - Google Patents
Device and method for measuring curved surface local shielding efficiency of electromagnetic shielding clothes Download PDFInfo
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- CN108152600B CN108152600B CN201711306741.2A CN201711306741A CN108152600B CN 108152600 B CN108152600 B CN 108152600B CN 201711306741 A CN201711306741 A CN 201711306741A CN 108152600 B CN108152600 B CN 108152600B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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Abstract
The invention provides a device and a method for measuring the local shielding effect of a curved surface of an electromagnetic shielding garment, which solve the problem that the shielding effect of the local area of the curved surface of the electromagnetic shielding garment on electromagnetic waves cannot be mastered, and the device comprises a curved surface box body, a curved surface cloth supporting mechanism, a pressing sheet and a signal receiving system, wherein the upper part, the lower part and the side part of the curved surface box body are respectively provided with a pressing sheet area, the side part of the curved surface box body is provided with the curved surface cloth supporting mechanism, and the rear side of the curved surface cloth supporting mechanism is provided; the pressing sheet is matched with the pressing sheet area, the garment fabric is fixed on the side portion of the curved surface box body through the pressing sheet, and the curved surface cloth supporting mechanism supports the garment fabric. A corresponding test method is disclosed according to the above device. The invention has the advantages of simple manufacture, convenient operation, reasonable design, accurate test and low cost, can scientifically and accurately measure the shielding effectiveness of the curved surface local area of the electromagnetic shielding clothes, and can accurately acquire related data to lay a foundation for each subsequent work.
Description
Technical Field
The invention relates to the technical field of textile garment science and technology and electromagnetic shielding tests, in particular to the technical field of quickly, simply and accurately testing the curved surface local shielding efficiency of electromagnetic shielding garments, and particularly relates to a device and a method for measuring the curved surface local shielding efficiency of the electromagnetic shielding garments.
Background
The electromagnetic shielding clothes are important products widely required by military, electric power, aerospace, medical treatment, civil use and special industries at present, and the testing of the shielding efficiency of the electromagnetic shielding clothes is a difficult point in the field. Due to the flexibility and the variety of styles of the clothes, the test result of the shielding effect of the clothes is greatly influenced by slight change of the local curved surface of the clothes. However, when the electromagnetic shielding garment is integrally worn, due to the influence of multiple factors of other elements and parts of the garment, the shielding effect of the curved surface form of the garment on electromagnetic waves is difficult to independently analyze at present, so that the related research, actual design, production and test evaluation of the electromagnetic shielding garment cannot be effectively carried out.
Therefore, the method has important significance in mastering the shielding effect of the local curved surface area of the garment on the electromagnetic waves, not only can lay a foundation for relevant theoretical research, but also can provide a basis for design, production, test and evaluation of the electromagnetic shielding garment. To achieve these objectives, an effective device and method for measuring the shielding effectiveness of the curved local area of the electromagnetic shielding garment and accurately acquiring relevant data for subsequent analysis are needed, but no such device and method is available.
Disclosure of Invention
Aiming at the technical problem that the shielding effect of the local area of the curved surface of the electromagnetic shielding garment on electromagnetic waves cannot be mastered at present, the invention provides the device and the method for measuring the local shielding effect of the curved surface of the electromagnetic shielding garment, which are convenient to operate and accurate in data measurement.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: an apparatus for measuring the local shielding effectiveness of curved surfaces of electromagnetic shielding garments, comprising: the device comprises a curved surface box body, a curved surface cloth supporting mechanism, a pressing sheet and a signal receiving system, wherein the upper part, the lower part and the side part of the curved surface box body are respectively provided with a pressing sheet area, the side part of the curved surface box body is provided with the curved surface cloth supporting mechanism, the rear side of the curved surface cloth supporting mechanism is provided with the slidable signal receiving system, and the signal receiving system is connected with measuring equipment through a lead; the pressing sheet is matched with the pressing sheet area, the garment fabric is fixed on the side portion of the curved surface box body through the pressing sheet, and the curved surface cloth supporting mechanism supports the garment fabric.
The curved surface box body comprises a curved surface wave absorbing plate, an upper wave absorbing plate and a lower wave absorbing plate, and the upper wave absorbing plate and the lower wave absorbing plate are respectively fixed on the upper part and the lower part of the curved surface wave absorbing plate; the side part of the curved wave absorbing plate is provided with an opening, the two sides of the opening are provided with side pressing plate areas, the upper wave absorbing plate is provided with an upper pressing plate area close to the opening area, and the lower wave absorbing plate is provided with a lower pressing plate area close to the opening area; and the side pressing area, the upper pressing area and the lower pressing area are provided with a plurality of outwards extending screws for fixing pressing sheets.
The curved surface cloth supporting mechanism comprises a plurality of curved surface supports, two sides of each curved surface support are fixed at the opening of the curved surface wave absorbing plate through fixing devices, and the curved surface supports are positioned between the upper pressing plate area and the lower pressing plate area; the fixing device is a hidden button, a hook or a clip.
The pressing sheets comprise side pressing sheets and upper and lower pressing sheets, and screw holes matched with the screws are formed in the side pressing sheets and the upper and lower pressing sheets; the inner side of the side pressing piece is provided with a side suction wave plate, and the side pressing piece and the side suction wave plate are matched and fixed on a side pressing piece area through a screw hole and a screw; and the upper and lower pressing sheets and the upper and lower wave absorbing plates are matched and fixed on the upper and lower pressing sheets and the lower pressing sheet area through screw holes and screws.
The curved wave absorbing plate, the upper wave absorbing plate and the lower wave absorbing plate form a semi-closed drum shape; the curved wave absorbing plate, the upper wave absorbing plate and the lower wave absorbing plate are of a two-layer or multi-layer structure, the outer layer is made of a smooth metal material, and the inner layer can be made of one or more wave absorbing materials; the wave-absorbing material is ferrite or composite wave-absorbing material, and the wave-absorbing material is in the form of a coating, fiber covering or wedge; the side-suction wave plate and the upper and lower wave plates are provided with two layers, and the fabric to be detected is clamped between the two layers of side-suction wave plates or the upper and lower wave plates.
The signal receiving system comprises a signal receiving probe and a probe bracket, the signal receiving probe is arranged in the probe bracket, and the tail part of the probe bracket is arranged in the horizontal sliding rod through a sliding block; the tail part of the horizontal sliding rod is arranged in the vertical sliding rod through a sliding block; the upper wave absorbing plate is provided with an upper track, the lower wave absorbing plate is provided with a lower track, the upper track corresponds to the lower track up and down, and the vertical sliding rod is arranged on the upper track and the lower track.
The curved wave absorbing plate has the transverse dimension of 10 cm-100 cm, the longitudinal dimension of 10cm-200cm and any curvature; the number of the fixing devices is less than the total height of the curved surface box divided by 1 cm; the curved surface support is made of a high polymer material transparent to electromagnetic waves, plastics, rubber or bamboo products; the outer layer metal of the upper wave absorbing plate, the lower wave absorbing plate and the curved wave absorbing plate is integrally formed in one step, and no welding seam exists between the upper wave absorbing plate and the curved wave absorbing plate; the size of the upper pressing area and the lower pressing area is 0.5cm-10 cm; the length of the screw rod is 0.5cm-5cm, and the diameter is 0.2cm-3 cm; the side pressing plates and the upper and lower pressing plates are made of smooth metal materials, the size curvature of the side pressing plates is consistent with that of the side pressing plate areas, and the size and curvature of the upper and lower pressing plates are consistent with those of the upper and lower pressing plates and the lower pressing plate areas; the side-suction wave plates and the upper and lower suction wave plates are made of wave-absorbing materials such as wave-absorbing sponge, wave-absorbing adhesive strips or high-strength wave-absorbing felt, the thickness of the wave-absorbing materials is less than 0.5cm, and the sizes of the wave-absorbing materials are respectively consistent with those of the side pressing plates and the upper and lower pressing plates; the signal receiving probe is an optical fiber probe or an electric field probe with smaller size, the size of the probe bracket is 2cm-10cm, the material of the probe bracket is wood, plastic, high polymer material and the like which are transparent to electromagnetic waves and have certain supporting strength, and the shape of the probe bracket is cylindrical, cubic or trihedral.
The horizontal sliding rod is provided with a horizontal slideway, and the tail part of the probe bracket is arranged in the horizontal slideway through a sliding block; the vertical slide bar is provided with a vertical slide way, and the tail part of the horizontal slide bar is arranged in the vertical slide way through a slide block.
The upper rail, the lower rail, the horizontal sliding rod, the vertical sliding rod and the probe bracket are provided with graduated scales; the side pressure piece is carved with the scale, is carved with the scale on last pressure piece district and the lower pressure piece district, is carved with horizontal size and camber on the different curved surface props.
The device for measuring the curved surface local shielding efficiency of the electromagnetic shielding clothes comprises the following testing methods:
the method comprises the following steps: adjusting the positions of the vertical sliding rod, the horizontal sliding rod and the probe bracket according to the test requirement to ensure that the spatial position of the signal receiving probe meets the requirement, and recording the position accurate value;
step two: setting parameters of a distance angle of a transmitting source, transmitting a signal to a signal receiving probe, and transmitting the received signal out through a wire to obtain the signal strength without a fabric;
step three: selecting the combination of curved surface supports with different sizes and curvatures according to the tested clothing area, and fixing the curved surface supports at the openings of the curved surface wave absorbing plate to ensure that the shape of the curved surface after the fabric is supported reaches the requirement;
step four: sleeving side absorption wave plates and upper and lower absorption wave plates corresponding to the side pressure plate area, the upper pressure plate area and the lower pressure plate area on an outward extending screw rod of the pressure plate area, sleeving a fabric supported by a curved surface on the screw rod, and covering the side absorption wave plates and the upper and lower absorption wave plates;
step five: sleeving the other layer of side wave absorbing plate and the upper and lower wave absorbing plates into the extended screw to cover the fabric, finally sleeving the side wave absorbing plate and the upper and lower wave absorbing plates into the corresponding side pressing area, upper pressing area and lower pressing area, and screwing the nut to tightly clamp the wave absorbing plates and the fabric between the pressing areas and the pressing sheets;
step six: keeping the parameters such as the distance angle of the transmitting source and the like unchanged, transmitting a signal to the signal receiving probe, transmitting the received signal out through a wire, and measuring the signal intensity when the fabric exists and the signal intensity when the fabric does not exist to obtain the shielding efficiency of a certain position area of the fabric in the curved surface form;
step seven: and changing the combination of the curved surface supports, changing the position of the signal receiving probe, repeating the steps from one step to six, and testing the shielding effectiveness of the fabric in different curved surface forms and different positions of the signal receiving probe.
The invention has the beneficial effects that: the method has the advantages of simple manufacture, convenient operation, reasonable design, accurate test and low cost, can scientifically and accurately measure the shielding effectiveness of the curved surface local area of the electromagnetic shielding clothes, and can accurately acquire related data to lay a foundation for each subsequent work. The invention overcomes the defect that the shielding effect of the local area of the curved surface of the electromagnetic shielding clothes on electromagnetic waves cannot be mastered at present, not only lays a foundation for relevant theoretical research, but also provides a basis for design, production and test evaluation of the electromagnetic shielding clothes, and has positive effects on promoting scientific research development, actual production and test evaluation in the field of the electromagnetic shielding clothes, thereby having important significance and practical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic front view of the present invention.
Fig. 2 is a side view of the present invention.
Fig. 3 is a schematic front view of a signal receiving system according to the present invention.
Fig. 4 is a schematic side view of a signal receiving system according to the present invention.
FIG. 5 is a schematic view of the structure of the upper and lower compressing sheets of the present invention.
FIG. 6 is a schematic view of the structure of the side press of the present invention.
In the figure, 1 is an upper wave absorbing plate, 2 is a screw, 3 is an upper pressing plate area, 5 is a side pressing plate area, 6 is a signal receiving probe, 7 is a lower pressing plate area, 8 is a lower rail, 10 is a lower wave absorbing plate, 11 is a curved surface support, 12 is a vertical sliding rod, 15 is a horizontal sliding rod, 16 is a probe support, 17 is an upper rail, 18 is a lead, 19 is a supporting rod, 20 is a horizontal sliding rail, 21 is a vertical sliding rail, 22 is a screw hole, 23 is an upper pressing plate and a lower pressing plate, 24 is an upper wave absorbing plate and a lower wave absorbing plate, 27 is a side pressing plate, 28 is a side wave absorbing plate, 30 is a curved surface wave absorbing plate, and 31 is a fixing device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
An apparatus for measuring the local shielding effectiveness of curved surfaces of electromagnetic shielding garments, comprising: the device comprises a curved surface box body, a curved surface cloth supporting mechanism, a pressing sheet and a signal receiving system, wherein the upper part, the lower part and the side part of the curved surface box body are respectively provided with a pressing sheet area, the side part of the curved surface box body is provided with the curved surface cloth supporting mechanism, the rear side of the curved surface cloth supporting mechanism is provided with the slidable signal receiving system, and the signal receiving system is connected with measuring equipment through a lead and is responsible for receiving and transmitting signals at different positions; the pressing sheet is matched with the pressing sheet area, the pressing sheet is responsible for tightly fixing the garment material, the pressing sheet fixes the garment material on the side portion of the curved surface box body, the curved surface cloth supporting mechanism supports the garment material, and the plurality of groups of curved surface supports are responsible for adjusting the curvature of the garment material. The position of the signal receiving system is adjustable, and the signal receiving system is used for receiving signals transmitted by external equipment and measuring the signal intensity of the fabric, so that the shielding effectiveness of a certain position area of the fabric in a certain curved surface form is calculated.
As shown in fig. 1 and 2, the curved-surface box body includes a curved-surface wave absorbing plate 30, an upper wave absorbing plate 1 and a lower wave absorbing plate 10, and the upper wave absorbing plate 1 and the lower wave absorbing plate 10 are respectively fixed on the upper portion and the lower portion of the curved-surface wave absorbing plate 30. The side part of the curved wave absorbing plate 30 is provided with an opening, and the two sides of the opening are provided with side pressure plate areas 5. Two side pressure plate areas 5 are arranged and positioned at the edges of two sides of the curved wave absorbing plate 30 and are in the shape of a long strip arc. An upper pressing sheet area 3 is arranged on the upper wave absorbing plate 1 close to the opening area, a lower pressing sheet area 7 is arranged on the lower wave absorbing plate 10 close to the opening area, the upper pressing sheet area 3 and the lower pressing sheet area 7 are located on the upper portion or the lower portion of the side pressing sheet area 5, the shape of the upper pressing sheet area 3 and the lower pressing sheet area 7 is arc-shaped, and the upper pressing sheet area is matched with the upper wave absorbing plate 1 and the lower wave absorbing plate 10. The side tabletting area 5, the upper tabletting area 3 and the lower tabletting area 7 are provided with a plurality of outwards extending screws 2 for fixing tabletting. The curved wave absorbing plate 30, the upper wave absorbing plate 1 and the lower wave absorbing plate 10 form a semi-closed drum shape.
The curved wave absorbing plate 30, the upper wave absorbing plate 1 and the lower wave absorbing plate 10 are of a two-layer or multi-layer structure, the outer layer is made of a smooth metal material, and the inner layer can be made of one or more layers of wave absorbing materials; the wave-absorbing material is ferrite or composite wave-absorbing material, and the wave-absorbing material is in the form of a coating, fiber covering or wedge. The curved wave absorbing plate 30 has a transverse dimension of 10cm to 100cm, a longitudinal dimension of 10cm to 200cm and any curvature. The outer layer metal of the upper wave absorbing plate 1, the lower wave absorbing plate 10 and the curved wave absorbing plate 30 is integrally formed in one step, welding is avoided between the upper wave absorbing plate and the curved wave absorbing plate, a seam is avoided, the size of the upper wave absorbing plate is determined along with the curved wave absorbing plate, and the inner wave absorbing material can be added after the outer layer metal is formed. The size of the upper tabletting area 3 and the lower tabletting area 7 is between 0.5cm and 10 cm; the screw 2 has a length of 0.5cm-5cm and a diameter of 0.2cm-3cm, and is used for installing and fixing the tabletting. The side pressing pieces 27 and the upper and lower pressing pieces 23 are made of smooth metal materials, the dimensional curvature and the rate of the side pressing pieces 27 are consistent with those of the side pressing piece areas 5, and the dimensional curvature and the rate of the upper and lower pressing pieces 23 are consistent with those of the upper and lower pressing pieces 23 and the lower pressing piece areas 7.
The curved surface cloth supporting mechanism comprises a plurality of curved surface supports 11, the two sides of each curved surface support 11 are fixed at the opening of the curved surface wave absorbing plate 30 through fixing devices 31, and the curved surface supports 11 are located between the upper pressing plate area 3 and the lower pressing plate area 7. The curved surface support 11 is responsible for adjusting the curvature of the fabric. The two sides of the curved surface support 11 are a part of the hidden button, hook and clip structure, and can be used together with the other part of the fixing device 31 on the two sides of the curved surface wave absorbing plate 30 to form a curved surface support fixing device. The fixing device 31 is a hidden button, a hook or a clip, and is used for hanging and fixing the curved surface support 11. The number of fixing means 31 is at most 1cm divided by the total height of the curved box. Each curved surface support 11 corresponds to a certain part of the side surface of the curved surface wave absorbing plate 30 and has different curvatures, and different curved surface shapes of the garment fabric can be formed by combining a plurality of curved surface supports. The curved surface support 11 is made of a high polymer material, plastic, rubber or bamboo product which has good flexibility and high strength and is transparent to electromagnetic waves. According to different test requirements, the curved surface support is divided into a plurality of models, each model corresponds to one size, and the size is the linear distance between the fixing devices on two sides of a certain position of the curved surface wave-absorbing plate. Each model is composed of a plurality of curved surface supports with different curvatures, and the fabric can reach the required curvature at the corresponding position of the curved surface wave absorption plate 30.
As shown in fig. 5 and 6, the pressing pieces include side pressing pieces 27 and upper and lower pressing pieces 23, and screw holes 22 matched with the screws 2 are formed in the side pressing pieces 27 and the upper and lower pressing pieces 23. The inner side of the side pressing plate 27 is provided with a side absorption wave plate 28, the side absorption wave plate 28 is provided with a screw hole 22 matched with the side pressing plate 27, and the side pressing plate 27 and the side absorption wave plate 28 are matched and fixed on the side pressing plate area 5 through the screw hole 22 and the screw 2; the inner sides of the upper and lower pressing sheets 23 are provided with upper and lower wave absorbing plates 24, the upper and lower wave absorbing plates 24 are provided with screw holes 22 matched with the upper and lower pressing sheets 23, and the upper and lower pressing sheets 23 and the upper and lower wave absorbing plates 24 are fixed on the upper and lower pressing sheets 23 and the lower pressing sheet area 7 through the screw holes 22 and the screws 2 in a matching manner. The shell fabric is fixed and electromagnetic wave leakage is prevented by connecting the nut with the screw rod 2.
The side pressing piece 27 and the upper and lower pressing pieces 23 are made of smooth metal materials, the sizes of the side pressing piece 27 and the upper pressing piece area (or the lower pressing piece area) are respectively consistent with the sizes of the side pressing piece area and the upper pressing piece area (or the lower pressing piece area), the curvatures of the side pressing piece 27 and the upper and lower pressing pieces 23 are completely consistent with the curvatures of the corresponding pressing piece areas, seamless overlapping can be achieved when the corresponding pressing piece areas are covered, and gaps cannot be seen. The side-suction wave plate 24 and the upper and lower wave-suction plates 28 are provided with two layers, and the fabric to be tested is clamped between the two layers of side-suction wave plates 24 or the upper and lower wave-suction plates 28. The screw rods 2 extending outwards from the edges of the upper wave absorbing plate and the lower wave absorbing plate and the screw rods 2 extending outwards from the two sides of the curved wave absorbing plate are sleeved in the screw rod holes 22, and the shell fabric is fixed by screwing down the screw rods with nuts. After the pressing sheet is fastened to the curved surface box, a gap between the pressing sheet and the pressing sheet area on the curved surface box is completely sealed by the wave absorbing plate, and electromagnetic wave leakage is prevented. The side absorbing wave plate 24 and the upper and lower absorbing wave plates 28 are made of flexible and elastic wave absorbing materials, such as wave absorbing sponge, wave absorbing adhesive strips or high-strength wave absorbing felt, the thickness of the wave absorbing sponge is less than 0.5cm, the sizes of the wave absorbing sponge and the wave absorbing adhesive strips are respectively consistent with those of the side pressing plate 27 and the upper and lower pressing plates 23, and the wave absorbing sponge and the wave absorbing adhesive strips can be lined between the pressing plates and.
As shown in fig. 3 and 4, the signal receiving system comprises a signal receiving probe 6 and a probe bracket 16, wherein the signal receiving probe 6 is installed in the probe bracket 16, and a lead 18 is installed at the rear part of the signal receiving probe 6 and is used for transmitting received signals to the curved box. The tail part of the probe bracket 16 is arranged in the horizontal sliding rod 15 through a sliding block. The tail part of the horizontal sliding rod 15 is arranged in the vertical sliding rod 12 through a sliding block; the wave absorbing plate is characterized in that an upper rail 17 is arranged on the upper wave absorbing plate 1, a lower rail 8 is arranged on the lower wave absorbing plate 10, the upper rail 17 corresponds to the lower rail 8 up and down, a vertical sliding rod 12 is arranged on the upper rail 17 and the lower rail 8, and the vertical sliding rod 12 can slide back and forth in the upper rail 17 and the lower rail 8. The middle part of the vertical sliding rod 12 is provided with a telescopic supporting rod 19, and a lead 18 connected with the signal receiving probe 6 is connected with an external signal transmitting device through the supporting rod 19. The lead 18 is an optical fiber signal wire or a microwave cable which generates little interference to the field intensity in the curved surface box, is led out through a small hole of the support rod 19 and can extend or shorten along with the position of the signal receiving probe 6 so as to adapt to different positions of the signal receiving probe 6.
Preferably, a horizontal slide way 20 is arranged on the horizontal slide bar 15, the tail part of the probe bracket 16 is arranged in the horizontal slide way 20 through a slide block, the slide block is embedded in the horizontal slide way 20, and the slide block drives the probe bracket 16 to move in the horizontal slide way 20, so that the horizontal movement of the signal receiving probe 6 is realized. The vertical slide bar 12 is provided with a vertical slide rail 21, the tail part of the horizontal slide bar 15 is arranged in the vertical slide rail 21 through a slide block, and the slide block is embedded into the vertical slide rail 21 to drive the horizontal slide bar 15 to move up and down along the vertical slide rail 21, so that the signal receiving probe 6 is driven to move up and down. The signal receiving probe 6 can move up and down, left and right and back and forth in the curved surface box body so as to detect the shielding effectiveness of different areas of the cloth. The horizontal sliding rod 15, the vertical sliding rod 12, the upper track 17 and the lower track 8 are all made of wood, plastic, polymer materials and the like which are transparent to electromagnetic waves and have certain supporting strength and smooth surfaces.
The signal receiving probe 6 is a fiber probe or an electric field probe with smaller size, and the size of the probe bracket 16 is between 2cm and 10cm, so that the probe can be stably placed. The material of the probe holder 16 is wood, plastic, polymer material, etc. which is transparent to electromagnetic waves and has a certain supporting strength, and the shape of the probe holder 16 is cylindrical, cubic, or trihedral.
The upper track 17, the lower track 8, the horizontal sliding rod 15, the vertical sliding rod 12 and the probe bracket 16 are all provided with graduated scales, so that the accurate space position of the signal receiving probe can be determined. The side pressing piece 27 is carved with a graduated scale, the upper pressing piece area 3 and the lower pressing piece area 7 on the pressing piece area of the opening edge of the upper and lower wave absorbing plates are carved with graduated scales, and the different curved surface struts 11 are carved with transverse sizes and curvatures. According to the scales and the curvatures, the fabric can be adjusted into different curved surfaces, meanwhile, the quantitative model of the measured fabric can be accurately mastered, and accordingly, the three-dimensional coordinates and the point curvatures of each region position of the fabric can be obtained, so that the curved surface form of the measured fabric can be accurately described, and a foundation can be provided for subsequent analysis and research by combining with the accurate position of the signal receiving probe 6.
Preferably, the curved wave absorbing plate 30, the upper wave absorbing plate 1 and the lower wave absorbing plate 10 are of a two-layer structure, the outer layer is made of a stainless steel metal material, and the inner layer is a ferrite coating. The curved wave absorbing plate 30 has a transverse dimension of 25cm and a longitudinal dimension of 38cm, and the periphery of the cross section conforms to the elliptical curvature. The length of the upper tabletting zone 3 and the lower tabletting zone 7 is 1.5cm, the length of the screw is 1cm, and the diameter is 0.5 cm. The fixing devices 31 are hidden buttons, the size of the fixing devices is determined according to the overall size of the curved surface box, the number of the fixing devices is 17, and the fixing devices are uniformly distributed in the height direction. The plug part of the hidden button is arranged on two sides of the curved surface support 11, and can be matched with the hidden button concave hole parts on two sides of the curved surface wave absorbing plate to form a curved surface support fixing device. The curved surface props by the good, intensity of flexibility and to the transparent plastics preparation of electromagnetic wave, according to the test requirement difference, the curved surface props the branch and is divided into 17 models, and each model has a plurality of curved surface of 12 different curvatures to prop and constitute, can make the surface fabric reach required curvature in the corresponding position of curved surface wave absorption plate. The side pressing piece 27 and the upper and lower pressing pieces 23 are made of smooth stainless steel metal materials, and the side absorption wave plate 24 and the upper and lower absorption wave plates 28 are flexible and elastic wave-absorbing sponges with the thickness of 0.2 cm. The signal receiving probe 6 is a fiber probe, the size of the probe bracket is 6cm, the material is plastic which is transparent to electromagnetic waves and has certain supporting strength, and the shape is a cylinder.
The device for measuring the curved surface local shielding efficiency of the electromagnetic shielding clothes comprises the following testing methods:
the method comprises the following steps: and adjusting the positions of the vertical sliding rod 12, the horizontal sliding rod 15 and the probe bracket 16 according to the test requirement, so that the spatial position of the signal receiving probe 6 meets the requirement, and recording the accurate position value.
The space positions of the signal receiving probes 6 are respectively positioned at six points which are uniformly distributed in the curved surface box.
Step two: and setting parameters of the distance angle of the transmitting source, transmitting signals to the signal receiving probe 6, and transmitting the received signals out through a wire to obtain the signal strength without the fabric.
Setting the distance of a transmitting source to be 1.5 meters, setting the angle and the level to be zero, transmitting a microwave signal to a receiving probe, wherein the frequency is 1GHz-3GHz, and transmitting the received signal out through a lead to obtain the signal intensity without the fabric.
Step three: according to the tested clothing area, the combination of the curved surface supports 11 with different sizes and curvatures is selected, and the curved surface supports 11 are fixed at corresponding positions of the opening of the curved surface wave absorbing plate 30, so that the curved surface shape of the fabric after being supported can meet the requirements.
According to the tested clothing area, 10 combinations of the curved surface supports 11 with different sizes and curvatures are selected, and the curved surface supports 11 are fixed at corresponding positions of the curved surface box, so that the curved surface shape after the fabric is supported can meet the requirements.
Step four: sleeving a side absorbing wave plate 28 and an upper and lower absorbing wave plate 24 corresponding to the side pressing plate area 5, the upper pressing plate area 3 and the lower pressing plate area 7 on the screw rod 2 extending outwards of the pressing plate area, and then sleeving the fabric supported by the curved surface support 11 on the screw rod 2 to cover the side absorbing wave plate 28 and the upper and lower absorbing wave plates 24;
step five: sleeving the other layer of side wave absorbing plate 28 and the upper and lower wave absorbing plates 24 into the outward extending screw rod 2 to cover the fabric, finally sleeving the side wave absorbing plate 2, the upper tabletting area 3 and the lower tabletting area 7 into the corresponding side wave absorbing plate, and screwing the nut to tightly clamp the wave absorbing plates and the fabric between the tabletting areas and the tabletting;
step six: keeping the parameters such as the distance angle of the transmitting source and the like unchanged, transmitting signals to the signal receiving probe 6, transmitting the received signals out through a conducting wire, and measuring the signal intensity when the fabric exists and the signal intensity when the fabric does not exist to obtain the shielding efficiency of a certain position area of the fabric in the curved surface form.
The shielding effectiveness is related to the logarithm of the ratio between the signal strength values without and with the fabric. The signal strength determines the dynamic range of measurement, i.e. the larger the signal strength is, the larger the upper limit of the shielding effectiveness can be measured, because the signal strength is low, the signal cannot penetrate through the fabric, and the signal receiver cannot receive and read the accurate signal value, so that the shielding effectiveness cannot be calculated correctly.
Step seven: and changing the combination of the curved surface supports, changing the position of the signal receiving probe 6, repeating the steps from one step to six, and testing the shielding effectiveness of the fabric in different curved surface forms and at different positions of the signal receiving probe 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An apparatus for measuring the local shielding effectiveness of a curved surface of an electromagnetic shielding garment, comprising: the device comprises a curved surface box body, a curved surface cloth supporting mechanism, a pressing sheet and a signal receiving system, wherein the upper part, the lower part and the side part of the curved surface box body are respectively provided with a pressing sheet area, the side part of the curved surface box body is provided with the curved surface cloth supporting mechanism, the rear side of the curved surface cloth supporting mechanism is provided with the slidable signal receiving system, and the signal receiving system is connected with measuring equipment through a lead; the pressing sheet is matched with the pressing area, the garment fabric is fixed on the side part of the curved box body through the pressing sheet, and the garment fabric is supported through the curved cloth supporting mechanism;
the curved-surface box body comprises a curved-surface wave absorbing plate (30), an upper wave absorbing plate (1) and a lower wave absorbing plate (10), and the upper wave absorbing plate (1) and the lower wave absorbing plate (10) are respectively fixed on the upper part and the lower part of the curved-surface wave absorbing plate (30); an opening is formed in the side portion of the curved wave absorbing plate (30), side pressing plate areas (5) are arranged on the two sides of the opening, an upper pressing plate area (3) is arranged on the upper wave absorbing plate (1) close to the opening area, and a lower pressing plate area (7) is arranged on the lower wave absorbing plate (10) close to the opening area; the side pressing area (5), the upper pressing area (3) and the lower pressing area (7) are provided with a plurality of outwards extending screws (2) for fixing pressing sheets.
2. The device for measuring the curved local shielding effectiveness of the electromagnetic shielding garment according to claim 1, wherein the curved wave absorbing plate (30), the upper wave absorbing plate (1) and the lower wave absorbing plate (10) form a semi-closed drum shape; the pressing sheets comprise side pressing sheets (27) and upper and lower pressing sheets (23), and screw holes (22) matched with the screws (2) are formed in the side pressing sheets (27) and the upper and lower pressing sheets (23); the inner side of the side pressing plate (27) is provided with a side absorption wave plate (28), and the side pressing plate (27) and the side absorption wave plate (28) are matched and fixed on the side pressing plate area (5) through a screw hole (22) and a screw (2); the inner sides of the upper and lower pressing sheets (23) are provided with upper and lower wave absorbing plates (24), and the upper and lower pressing sheets (23) and the upper and lower wave absorbing plates (24) are fixed on the upper and lower pressing sheets (23) and the lower pressing sheet area (7) through the screw rod holes (22) and the screw rods (2) in a matching manner.
3. The device for measuring the local shielding effectiveness of the curved surface of the electromagnetic shielding garment according to claim 1, wherein the curved surface cloth supporting mechanism comprises a plurality of curved surface supports (11), two sides of each curved surface support (11) are fixed at the opening of the curved surface wave absorbing plate (30) through fixing devices (31), and each curved surface support (11) is located between the upper pressing sheet area (3) and the lower pressing sheet area (7); the fixing device (31) is a hidden button, a hook or a clip.
4. The apparatus for measuring the curved partial shielding effectiveness of an electromagnetic shielding garment according to claim 3, wherein the number of the fixing means (31) is less than the total height of the curved box divided by 1 cm; the curved surface support (11) is made of a polymer material transparent to electromagnetic waves, plastics, rubber or bamboo products.
5. The device for measuring the local shielding effectiveness of the curved surface of the electromagnetic shielding garment according to claim 2, wherein the curved surface wave absorbing plate (30), the upper wave absorbing plate (1) and the lower wave absorbing plate (10) are of a two-layer or multi-layer structure, the outer layer is made of a smooth metal material, and the inner layer is made of one or more wave absorbing materials; the wave-absorbing material is ferrite or composite wave-absorbing material, and the wave-absorbing material is in the form of a coating, fiber covering or wedge; the side-absorbing wave plates (28) and the upper and lower wave plates (24) are provided with two layers, and the fabric to be tested is clamped between the two layers of side-absorbing wave plates (28) or the upper and lower wave plates (24).
6. The device for measuring the curved surface partial shielding effectiveness of the electromagnetic shielding garment according to claim 5, wherein the signal receiving system comprises a signal receiving probe (6) and a probe bracket (16), the signal receiving probe (6) is installed in the probe bracket (16), and the tail part of the probe bracket (16) is arranged in the horizontal sliding rod (15) through a sliding block; the tail part of the horizontal sliding rod (15) is arranged in the vertical sliding rod (12) through a sliding block; the wave absorbing plate is characterized in that an upper track (17) is arranged on the upper wave absorbing plate (1), a lower track (8) is arranged on the lower wave absorbing plate (10), the upper track (17) and the lower track (8) vertically correspond to each other, and a vertical sliding rod (12) is arranged on the upper track (17) and the lower track (8).
7. The device for measuring the curved local shielding effectiveness of the electromagnetic shielding clothes according to claim 6, wherein the curved wave absorbing plate (30) has a transverse dimension of 10cm to 100cm, a longitudinal dimension of 10cm to 200cm and any curvature; the upper wave absorbing plate (1), the lower wave absorbing plate (10) and the outer layer metal of the curved wave absorbing plate are integrally formed at one time, and no welding seam exists between the upper wave absorbing plate and the curved wave absorbing plate; the size of the upper pressing area (3) and the lower pressing area (7) is 0.5cm-10 cm; the length of the screw (2) is 0.5cm-5cm, and the diameter is 0.2cm-3 cm; the side pressing plates (27) and the upper and lower pressing plates (23) are made of smooth metal materials, the size and the curvature of the side pressing plates (27) are consistent with those of the side pressing plate area (5), and the size and the curvature of the upper and lower pressing plates (23) are consistent with those of the upper pressing plate area (3) and the lower pressing plate area (7); the side wave absorbing plate (28) and the upper and lower wave absorbing plates (24) are made of wave absorbing materials such as wave absorbing sponge, wave absorbing adhesive strips or high-strength wave absorbing felt, the thickness of the wave absorbing material is less than 0.5cm, and the sizes of the wave absorbing material are respectively consistent with those of the side pressing plate (27) and the upper and lower pressing plates (23); the signal receiving probe (6) is an optical fiber probe or an electric field probe with a smaller size, the size of the probe support (16) is 2cm-10cm, the material of the probe support (16) is wood, plastic or high polymer material which is transparent to electromagnetic waves and has certain supporting strength, and the shape of the probe support (16) is cylindrical, cubic or trihedral.
8. The device for measuring the curved surface partial shielding effectiveness of the electromagnetic shielding clothes according to claim 6, wherein the horizontal sliding rod (15) is provided with a horizontal slideway (20), and the tail part of the probe bracket (16) is arranged in the horizontal slideway (20) through a sliding block; the vertical slide rod (12) is provided with a vertical slide way (21), and the tail part of the horizontal slide rod (15) is arranged in the vertical slide way (21) through a slide block.
9. The device for measuring the curved surface partial shielding effect of the electromagnetic shielding clothes according to claim 8, wherein scales are arranged on the upper track (17), the lower track (8), the horizontal sliding rod (15), the vertical sliding rod (12) and the probe bracket (16); the side pressing piece (27) is provided with a graduated scale, the upper pressing piece area (3) and the lower pressing piece area (7) are provided with graduated scales, and different curved surface supports (11) are provided with transverse sizes and curvatures.
10. The apparatus for measuring the curved surface partial shielding effectiveness of the electromagnetic shielding garment according to claim 8 or 9, wherein the testing method comprises:
the method comprises the following steps: the positions of the vertical sliding rod (12), the horizontal sliding rod (15) and the probe bracket (16) are adjusted according to the test requirement, so that the spatial position of the signal receiving probe (6) meets the requirement, and the accurate position value is recorded;
step two: setting parameters of the distance and the angle of a transmitting source, transmitting a signal to a signal receiving probe (6), and transmitting the received signal out through a wire to obtain the signal strength without the fabric;
step three: selecting the combination of curved surface supports (11) with different sizes and curvatures according to the tested clothing area, and fixing the curved surface supports (11) at the opening of the curved surface wave absorbing plate (30) to ensure that the shape of the curved surface after the fabric is supported reaches the requirement;
step four: sleeving a side absorbing wave plate (28) and an upper and lower absorbing wave plate (24) corresponding to the side pressing plate area (5), the upper pressing plate area (3) and the lower pressing plate area (7) on the screw (2) extending outwards of the pressing plate area, sleeving the fabric supported by the curved surface support (11) on the screw (2), and covering the side absorbing wave plate (28) and the upper and lower absorbing wave plates (24);
step five: sleeving the other layer of side wave absorbing plate (28) and the upper and lower wave absorbing plates (24) into the outwards extending screw (2) to cover the fabric, finally sleeving the side wave absorbing plate (5), the upper pressing plate (3) and the lower pressing plate (7) correspondingly, and screwing the nut to tightly clamp the wave absorbing plates and the fabric between the pressing plate area and the pressing plate;
step six: keeping the distance and angle parameters of the transmitting source unchanged, transmitting a signal to the signal receiving probe (6), transmitting the received signal out through a wire, and measuring the signal intensity when the fabric exists and the signal intensity when the fabric does not exist to obtain the shielding effectiveness of a certain position area of the fabric in the curved surface form;
step seven: and changing the combination of the curved surface supports, changing the position of the signal receiving probe (6), repeating the steps from one step to six, and testing the shielding effectiveness of the fabric in different curved surface forms and at different positions of the signal receiving probe (6).
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| CN201711306741.2A CN108152600B (en) | 2017-12-11 | 2017-12-11 | Device and method for measuring curved surface local shielding efficiency of electromagnetic shielding clothes |
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| CN201711306741.2A CN108152600B (en) | 2017-12-11 | 2017-12-11 | Device and method for measuring curved surface local shielding efficiency of electromagnetic shielding clothes |
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