CN211824248U - Capacitive micro-gap displacement test system based on flexible circuit board - Google Patents
Capacitive micro-gap displacement test system based on flexible circuit board Download PDFInfo
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- CN211824248U CN211824248U CN202020929288.1U CN202020929288U CN211824248U CN 211824248 U CN211824248 U CN 211824248U CN 202020929288 U CN202020929288 U CN 202020929288U CN 211824248 U CN211824248 U CN 211824248U
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Abstract
The utility model discloses a capacitance type micro-gap displacement test system based on a flexible circuit board, which comprises the flexible circuit board, a capacitance polar plate, a digital bridge and a computer, wherein the capacitance polar plate comprises a large capacitance polar plate and a small capacitance polar plate which are arranged in parallel relatively, and the vertical projection of the small capacitance polar plate towards the large capacitance polar plate falls on the large capacitance polar plate; the large capacitor plate and the small capacitor plate are respectively arranged on the two flexible circuit boards; the two capacitor plates are arranged asymmetrically, and the two capacitor plates are arranged in a size difference manner, so that the adverse effect of the edge effect on the inverse proportional relation between the capacitance value and the displacement is effectively reduced, a certain installation error is allowed, and the requirement on the assembly precision is reduced, so that the capacitor plate assembly has excellent assembly adaptability and the adverse effect of the edge effect is reduced; and a shielding layer is also arranged, so that the electromagnetic environment interference is reduced.
Description
Technical Field
The utility model belongs to the technical field of the sensing test, concretely relates to electric capacity formula microgap displacement test system based on flexible circuit board.
Background
At present, the realization methods of the micro-gap displacement sensor are many, and the micro-gap displacement sensor mainly comprises an optical fiber micro-gap displacement sensor, an image micro-gap displacement sensor and an eddy current micro-gap displacement sensor. The optical fiber micro-gap displacement sensor leads the optical fiber to go deep into the gap, and the optical fiber is easy to break due to large brittleness and large turning radius; the image micro-gap displacement sensor observes displacement change by using a camera, and has high requirement on installation space; the eddy current micro-gap displacement sensor measures displacement change by using an alternating electromagnetic field, is easily interfered by an electromagnetic environment and has high requirement on an installation space; the traditional plate capacitance type displacement sensor adopts a rigid substrate and is only suitable for plane measurement.
Therefore, it is urgently needed to develop a capacitive micro-gap displacement testing system based on a flexible circuit board to solve the above problems.
SUMMERY OF THE UTILITY MODEL
To solve the problems set forth in the background art described above. The utility model provides a little clearance displacement test system of electric capacity formula based on flexible circuit board.
In order to achieve the above object, the utility model provides a following technical scheme:
a capacitive micro-gap displacement test system based on a flexible circuit board comprises:
a flexible circuit board; the flexible circuit boards are two and are respectively arranged on structural members at two sides of the gap;
a capacitor plate; the capacitor plate comprises a large capacitor plate and a small capacitor plate which are arranged in parallel relatively, and the vertical projection of the small capacitor plate towards the large capacitor plate falls on the large capacitor plate; the large capacitor plate and the small capacitor plate are respectively arranged on the two flexible circuit boards;
a digital bridge for measuring a capacitance value of the capacitance plate; the digital bridge is electrically connected with the large capacitor plate and the small capacitor plate respectively;
the computer is used for calculating the displacement of the structural parts on the two sides of the gap after reading the digital bridge test data; the computer is connected with the digital bridge in communication.
Specifically, the flexible circuit board includes a first circuit board and a second circuit board;
the first circuit board comprises a first shielding layer, a second shielding layer and a signal layer, wherein the signal layer of the first circuit board is arranged between the first shielding layer and the second shielding layer; the small capacitor plate is arranged on a signal layer of the first circuit board;
the second circuit board comprises a third shielding layer, a fourth shielding layer and a signal layer, wherein the signal layer of the second circuit board is arranged between the third shielding layer and the fourth shielding layer; the large capacitance polar plate is arranged on the signal layer of the second circuit board;
the first shielding layer and the fourth shielding layer are respectively arranged on structural members at two sides of the gap; in the direction opposite to the small capacitor polar plate and the large capacitor polar plate, the second shielding layer is provided with a gap exposing the small capacitor polar plate; the third shielding layer is provided with a gap exposing the large capacitance polar plate;
the small capacitor polar plate and the large capacitor polar plate are electrically connected with the digital bridge through the signal lead and the coaxial cable; the signal leads are all arranged on the signal layer.
Preferably, the second and third shield layers are the same size; the first shielding layer and the fourth shielding layer have the same size.
Preferably, the first circuit board and the second circuit board are each 0.1mm to 0.2mm thick.
Compared with the prior art, the beneficial effects of the utility model are that:
in the capacitive micro-gap displacement test system, the two capacitor plates are arranged asymmetrically, and the two capacitor plates are arranged in a size difference manner, so that the adverse effect of the edge effect on the inverse proportional relation between the capacitance value and the displacement is effectively reduced, a certain installation error is allowed, and the requirement on the assembly precision is reduced, so that the capacitive micro-gap displacement test system has excellent assembly adaptability and the adverse effect of the edge effect is reduced; and a shielding layer is also arranged, so that the electromagnetic environment interference is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a capacitive micro-gap displacement test system based on a flexible circuit board according to the present application;
FIG. 2 is a schematic diagram of the structure of the capacitor plate of the present application;
FIG. 3 is a schematic view of a mounting structure of the capacitor plate and the flexible circuit board in the present application;
in the figure: 101-gap two-side structural member, 102-flexible circuit board, 1021-first shielding layer, 1022-second shielding layer, 1023-third shielding layer, 1024-fourth shielding layer, 1025-coaxial cable, 103-digital bridge, 104-computer, 201-large capacitance plate, 202-small capacitance plate, 203-signal lead.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a following technical scheme:
as shown in fig. 1-3, a capacitive micro-gap displacement test system based on a flexible circuit board 102 includes:
a flexible circuit board 102; the flexible circuit boards 102 are two pieces and are respectively arranged on the structural members 101 at two sides of the gap;
a capacitor plate; the capacitor plates comprise a large capacitor plate 201 and a small capacitor plate 202 which are arranged in parallel relatively, and the vertical projection of the small capacitor plate 202 towards the large capacitor plate 201 falls on the large capacitor plate 201; the large capacitor plate 201 and the small capacitor plate 202 are respectively arranged on the two flexible circuit boards 102;
a digital bridge 103 for measuring the capacitance values of the capacitive plates; the digital bridge 103 is electrically connected with the large capacitor plate 201 and the small capacitor plate 202 respectively;
a computer 104 for calculating the displacement of the structural member 101 at the two sides of the gap after reading the test data of the digital bridge 103; computer 104 is communicatively coupled to digital bridge 103.
As shown in fig. 3, the flexible circuit board 102 includes a first circuit board and a second circuit board;
the first circuit board comprises a first shielding layer 1021, a second shielding layer 1022 and a signal layer, wherein the signal layer of the first circuit board is arranged between the first shielding layer 1021 and the second shielding layer 1022; the small capacitor plate 202 is mounted on the signal layer of the first circuit board;
the second circuit board comprises a third shielding layer 1023, a fourth shielding layer 1024 and a signal layer, wherein the signal layer of the second circuit board is arranged between the third shielding layer 1023 and the fourth shielding layer 1024; the large capacitance plate 201 is mounted on the signal layer of the second circuit board;
the first shielding layer 1021 and the fourth shielding layer 1024 are respectively arranged on the structural members 101 at two sides of the gap; in the direction of the small capacitor plate 202 opposite to the large capacitor plate 201, the second shielding layer 1022 is provided with a notch exposing the small capacitor plate 202; the third shielding layer 1023 is provided with a notch exposing the large capacitance plate 201;
the small capacitor plate 202 and the large capacitor plate 201 are electrically connected with the digital bridge 103 through a signal lead 203 and a coaxial cable 1025; the signal leads 203 are all disposed in the signal layer.
As shown in fig. 3, the second and third shielding layers 1022 and 1023 have the same size; the first 1021 and fourth 1024 shield layers are the same size.
Preferably, the first circuit board and the second circuit board are each 0.1mm to 0.2mm thick. The thickness of the first circuit board and the second circuit board is 0.1mm-0.2mm, which ensures a small influence on the structural members 101 on both sides of the gap.
When the capacitor works, the two flexible circuit boards 102 are arranged on two sides of the gap and go deep into the plane or the arc surface gap to form a flat capacitor, and the displacement change (the change of the gap width in the opposite direction between the capacitor plates) on two sides of the gap is reversely solved by measuring the capacitance change. The flexible circuit board 102 has the advantages of being bendable, high in strength and strong in flexibility, the inverse proportional relation between the flat capacitor and the displacement is utilized to obtain the advantage of high sensitivity of the capacitor to displacement change under the condition of small displacement, and the influence of edge effect and the requirement on installation accuracy are reduced by adopting an asymmetric design. The test system establishes a correction model containing an area coefficient and a parasitic capacitance, achieves micro-gap displacement test with high requirements on installation space and measurement accuracy, and has high assembly adaptability and reliability. The computer 104 communicates with the digital bridge 103 via USB to obtain capacitance test data, and performs capacitance correction and gap settlement using dedicated software.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a little clearance displacement test system of electric capacity formula based on flexible circuit board which characterized in that includes:
a flexible circuit board; the flexible circuit boards are two and are respectively arranged on structural members at two sides of the gap;
a capacitor plate; the capacitor plate comprises a large capacitor plate and a small capacitor plate which are arranged in parallel relatively, and the vertical projection of the small capacitor plate towards the large capacitor plate falls on the large capacitor plate; the large capacitor plate and the small capacitor plate are respectively arranged on the two flexible circuit boards;
a digital bridge for measuring a capacitance value of the capacitance plate; the digital bridge is electrically connected with the large capacitor plate and the small capacitor plate respectively;
the computer is used for calculating the displacement of the structural parts on the two sides of the gap after reading the digital bridge test data; the computer is connected with the digital bridge in communication.
2. The capacitive micro-gap displacement test system based on the flexible circuit board as claimed in claim 1, wherein the flexible circuit board comprises a first circuit board and a second circuit board;
the first circuit board comprises a first shielding layer, a second shielding layer and a signal layer, wherein the signal layer of the first circuit board is arranged between the first shielding layer and the second shielding layer; the small capacitor plate is arranged on a signal layer of the first circuit board;
the second circuit board comprises a third shielding layer, a fourth shielding layer and a signal layer, wherein the signal layer of the second circuit board is arranged between the third shielding layer and the fourth shielding layer; the large capacitance polar plate is arranged on the signal layer of the second circuit board;
the first shielding layer and the fourth shielding layer are respectively arranged on structural members at two sides of the gap; in the direction opposite to the small capacitor polar plate and the large capacitor polar plate, the second shielding layer is provided with a gap exposing the small capacitor polar plate; the third shielding layer is provided with a gap exposing the large capacitance polar plate;
the small capacitor polar plate and the large capacitor polar plate are electrically connected with the digital bridge through the signal lead and the coaxial cable; the signal leads are all arranged on the signal layer.
3. The capacitive micro-gap displacement test system based on the flexible circuit board as claimed in claim 2, wherein the second shielding layer and the third shielding layer have the same size; the first shielding layer and the fourth shielding layer have the same size.
4. The capacitive micro-gap displacement test system based on the flexible circuit board as claimed in claim 2, wherein the first circuit board and the second circuit board have a thickness of 0.1mm to 0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020929288.1U CN211824248U (en) | 2020-05-28 | 2020-05-28 | Capacitive micro-gap displacement test system based on flexible circuit board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020929288.1U CN211824248U (en) | 2020-05-28 | 2020-05-28 | Capacitive micro-gap displacement test system based on flexible circuit board |
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| CN211824248U true CN211824248U (en) | 2020-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397501A (en) * | 2020-05-28 | 2020-07-10 | 中国工程物理研究院总体工程研究所 | Capacitive micro-gap displacement test system based on flexible circuit board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397501A (en) * | 2020-05-28 | 2020-07-10 | 中国工程物理研究院总体工程研究所 | Capacitive micro-gap displacement test system based on flexible circuit board |
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