CN111721330B - Coil and LVDT linear displacement sensor of flexbile plate wiring - Google Patents
Coil and LVDT linear displacement sensor of flexbile plate wiring Download PDFInfo
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- CN111721330B CN111721330B CN202010499020.3A CN202010499020A CN111721330B CN 111721330 B CN111721330 B CN 111721330B CN 202010499020 A CN202010499020 A CN 202010499020A CN 111721330 B CN111721330 B CN 111721330B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses an LVDT linear displacement sensor for wiring of a flexible board, which comprises a coil for wiring of the flexible board, wherein sleeves are arranged inside and outside the coil, two ends of each sleeve are sealed by end covers, a plurality of layers of spiral layers are laid on the flexible board, each layer of spiral layer is provided with a plurality of threads which are not connected with each other, and the flexible board is curled, so that the tail end of the previous spiral is connected with the head end of the next spiral in the same layer of spiral layer, and the spiral at the tail end of the previous layer of spiral layer is connected with the spiral at the head end of the next layer of spiral layer between different spiral layers. The invention has simple manufacturing process, the length and the precision of the coil are not influenced by the stroke and the precision of the winding machine, and the performance is more stable.
Description
Technical Field
The invention relates to the technical field of sensor manufacturing, in particular to a coil of flexible board wiring and an LVDT linear displacement sensor.
Background
LVDT (linear variable transformer) is an abbreviation of linear variable differential transformer, and is composed of a primary coil, two secondary coils, an iron core, a bobbin, a housing, etc., when the iron core moves from the middle to two sides, the difference between the output voltages of the two secondary coils and the iron core move linearly.
The coil of the existing LVDT sensor is manufactured by a winding machine, so the winding precision and the length of the coil are deeply limited by the precision and the stroke of the winding machine. On the one hand, the winding precision receives the influence of the enameled wire roughness of having been around good easily, and the winding roughness is that the accumulated error that the wire winding set up the line footpath again causes, so with the precision of current coiling machine, under the circumstances that the number of turns is many, the error accumulation is higher, and the roughness on wire winding surface reduces to cause the winding precision to descend. On the other hand, the stroke of the winding machine directly affects the length of the winding, and if the length of the winding needs to be increased, the winding machine with a longer stroke needs to be used, so that the equipment cost is increased.
In conclusion, in the actual production process, the precision and the stroke of the winding machine greatly limit the precision and the length of the LVDT type sensor coil, the product performance and the production efficiency are reduced, and the technical development and the market sale are not facilitated.
The above disadvantages need to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a coil for flexible board wiring and an LVDT linear displacement sensor.
The technical scheme of the invention is as follows:
a coil for wiring a flexible board is characterized in that a plurality of layers of spiral layers are laid on the flexible board, and each layer of spiral layer is provided with a plurality of spirals which are not connected with each other;
the flexible sheet is rolled such that,
in the thread layer of the same layer, the tail end of the last thread is connected with the head end of the next thread,
and between different spiral layers, the spiral at the tail end of the spiral layer of the upper layer is connected with the spiral at the head end of the spiral layer of the lower layer.
The coil of foretell flexoplate wiring, the both ends of spiral set up connecting hole and boss spliced pole respectively, the boss spliced pole with the connecting hole is pegged graft, connects adjacent two spiral.
Furthermore, in the same layer of spiral layer, the spiral line set up in the inside of flexonics board, the upper end of spiral line sets up the connecting hole, the lower extreme of spiral line sets up the boss spliced pole.
Furthermore, in the same layer of the thread layer, the thread is arranged outside the flexible board, the upper end of the thread is provided with the connecting hole, and the lower end of the thread is provided with the boss connecting column.
Furthermore, the boss connecting column is inserted into the connecting hole and is welded and fixed.
Furthermore, one end of the spiral is cut into the connecting hole through laser, and the other end of the spiral is welded with copper foil to form the boss connecting column.
Furthermore, the spiral lines are inclined, and the tail end of the previous spiral line and the head end of the next spiral line are arranged on the same vertical line.
In the above-mentioned flexible printed circuit board wired coil, any of the spiral layers are parallel to each other, and any of the spirals are parallel to each other.
In the coil for wiring the flexible board, the distance s between the spirals of the same spiral layer, the thickness t of the flexible board, the length l of the spirals, the diameter d of the wound enameled wire and the number n of the spiral layers simultaneously meet the requirements
The coil of the flexible board wiring comprises polyimide, and the flexible board is etched by photoetching after being coated with copper to form a plurality of mutually disconnected spirals.
The coil with the flexible board wiring is characterized in that the flexible board is curled, and the tail end of the flexible board is fixedly adhered.
In the coil wired on the flexible board, between the different spiral layers, the tail end of the last spiral of the previous spiral layer is connected with the head end of the first spiral of the next spiral layer.
The LVDT linear displacement sensor with the flexible board for wiring comprises the coil with the flexible board for wiring, sleeves are arranged inside and outside the coil, and two ends of each sleeve are sealed by end covers.
The linear displacement transducer for the LVDT with the flexible board wiring comprises three groups of coils with the flexible board wiring, wherein one group of the coils with the flexible board wiring is connected with a power supply electrode, and the other two groups of the coils with the flexible board wiring are used as signal output ends and connected with an external circuit.
Furthermore, three sets of coils of the flexible board wiring are arranged in the inner sleeve, the outer sleeve and the space surrounded by the end covers side by side, and the iron core is arranged in the inner sleeve.
According to the scheme, the flexible board has the advantages that a plurality of layers of copper foil spiral lines are formed by copper coating and photoetching, each layer is provided with a plurality of layers, one end of each layer is provided with a boss connecting post, the other end of each layer is provided with a connecting hole, the spiral lines at the head end and the tail end of each layer are respectively connected with the upper layer and the lower layer of spiral lines, the boss connecting post is connected with the connecting hole in an inserting mode through continuously curling the flexible board, two adjacent spiral lines in the same layer are connected, all the spiral lines on the flexible board are communicated to form a passage, the flexible board is curled into a multilayer structure, the next spiral line layer is arranged on the outer layer of the last spiral line layer and overlapped layer by layer, so that a coil is formed, and a shell is arranged outside the formed coil to manufacture the displacement sensor. Thus it is possible to
1. The length of each layer of spiral layer and the number of spirals are not limited by the stroke of equipment, so that the length of the formed coil after the flexible plate is curled is not limited, the coil can be infinitely extended, and the winding length is improved.
2. Copper line fixed position arranges and establishes the precision height, and the flexbile plate bending surface is smooth, and whole roughness is high, is favorable to the improvement of sensor performance.
3. The manufacturing process of the displacement sensor is simplified, after copper-clad photoetching of the flexible board is completed, the flexible board is only required to be curled to form a coil, the shell is arranged, the manufacturing of the displacement sensor can be completed, the processes of winding, dip coating baking and the like are omitted, the production rhythm is accelerated, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a first structural diagram of a flexible board.
Fig. 2 is a schematic structural diagram ii of the flexible board.
Fig. 3 is a schematic structural view of a spiral boss connecting column and a connecting hole.
Fig. 4 is a schematic diagram of a structure of a flexible board wiring coil.
FIG. 5 is a schematic diagram of spiral length calculation.
Fig. 6 is a first structural schematic diagram of the flexible board wiring LVDT linear displacement sensor.
Fig. 7 is a schematic structural diagram of a flexible printed circuit Linear Variable Differential Transformer (LVDT) linear displacement sensor.
Fig. 8 is a schematic structural diagram of an embodiment of a flexible printed wiring LVDT linear displacement sensor.
Fig. 9 is a schematic structural diagram of an embodiment of a flexible-board wired LVDT linear displacement sensor.
Fig. 10 is a schematic diagram of the structure of a flexible board in an embodiment of a linear displacement transducer wired with a flexible board LVDT.
Wherein, in the figures, the various reference numbers:
1. a coil; 11. a primary coil; 12. a secondary coil; 11. connecting holes; 12. a boss connecting column; 2. an inner sleeve; 3. an outer sleeve; 4. an end cap; 5. an iron core;
d. the diameter of the wrapped enameled wire; length of the spiral; s. spacing between spirals of the same layer of spiral; t. thickness of the flexible plate.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "fixed" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. The terms "upper", "lower", "vertical", "inner", "outer", "leading", "trailing", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. "Multi" means two or more unless explicitly defined otherwise.
The utility model provides a coil 1 of flexbile plate wiring, multilayer spiral layer is laid to the flexbile plate, and every layer of spiral layer all sets up many each other not connected spiral, and the flexbile plate is curled, and in the same layer of spiral layer, the tail end of last spiral is connected with the head end of next spiral, and between the different spiral layers, the spiral of last layer of spiral layer tail end is connected with the spiral of next layer of spiral layer head end.
As shown in fig. 1 and fig. 2, any spiral layers are parallel to each other, the pitch is consistent, and most of the spiral of the next spiral layer is positioned on the extension line of the previous spiral layer, which is beneficial for the etching formation of a photoetching machine. Along the current direction of the coil 1 after the flexible board is curled, no matter the current direction is a spiral line or a spiral layer, one end in which the current flows is called a head end, one end in which the current flows is called a tail end, the number of layers of the spiral layer is counted from top to bottom, and the number of the spiral lines of the same spiral layer is counted from the head end of the spiral layer.
As shown in fig. 3, for a single spiral, the two ends of the spiral are respectively provided with a connecting hole 11 and a boss connecting post 12, and when the flexible board is curled, the boss connecting post 12 is inserted into the connecting hole 11 to be fixed, so that two adjacent spirals on the same spiral layer are connected. The spirals incline, so that the head end of the previous spiral and the tail end of the next spiral are on the same vertical line in the same spiral layer, and when the flexible plate is curled along the vertical direction, the boss connecting column 12 can be accurately inserted into the connecting hole 11 to realize fixed connection. As shown in fig. 1, the flexible board is curled from top to bottom, in the same spiral layer, the spiral is arranged inside the flexible board, the upper end of the spiral is provided with a connecting hole 11, and the lower end of the spiral is provided with a boss connecting column 12; in the same layer of spiral layer, the spiral sets up in the outside of flexonics board, and the upper end of spiral sets up connecting hole 11, and the lower extreme of spiral sets up boss spliced pole 12.
Between different spiral layers, the spiral at the tail end of the last spiral layer is connected with the spiral at the head end of the next spiral layer, or the spiral at the tail end of the last spiral layer is extended to form the spiral at the head end of the next spiral layer, so that different spiral layers are connected.
In this embodiment, the flexible sheet is curled and the spirals are specifically connected as follows:
the head end of the first spiral layer is connected with the input end, and the tail end of the last spiral layer is connected with the output end. The flexible sheet is rolled up and then,
in the odd layers, the boss connecting column 12 at the tail end of the first spiral line is inserted into the connecting hole 11 at the head end of the second spiral line for connection, the boss connecting column 12 at the tail end of the second spiral line is inserted into the connecting hole 11 at the head end of the third spiral line for connection, the boss connecting column 12 at the tail end of the third spiral line is inserted into the connecting hole 11 at the head end of the fourth spiral line for connection, … …, and so on, the boss connecting column 12 at the last but one spiral line is inserted into the connecting hole 11 at the head end of the last spiral line for connection, and at this time, the curling odd number of turns of the flexible plate is completed.
In the even number layer, the boss connecting column 12 at the head end of the second spiral is inserted into the connecting hole 11 at the tail end of the first spiral for connection, the boss connecting column 12 at the head end of the third spiral is inserted into the connecting hole 11 at the tail end of the second spiral for connection, the boss connecting column 12 at the head end of the fourth spiral is inserted into the connecting hole 11 at the tail end of the third spiral for connection, … …, and so on, the boss connecting column 12 at the head end of the last spiral is inserted into the connecting hole 11 at the tail end of the last but one spiral for connection, and thus, the curling of the flexible board is completed by even number of circles.
Between different spiral layers, the tail end of the last spiral of the upper spiral layer is connected with the head end of the first spiral of the lower spiral layer.
As shown in fig. 4, the length l of the spirals, the spacing between spirals of the same layer of the spiral; s, the thickness t of the flexible plate, the diameter d of the wrapped enameled wire and the number n of layers of the spiral layer simultaneously meet the requirements
The spiral ACB is a spiral on the flexible board, after the flexible board is curled, the spiral ACB is wound around one circle of the coil 1, the spiral ACB is drawn out and unfolded, as shown in figure 5, the spiral ACB is a hypotenuse of a right-angle triangle, the space s between the spirals of the same layer of spiral layer is high, the length of the bottom side is equal to the circumference length taking the sum of the thicknesses t of a wound enameled wire and the flexible board as the diameter, and the length is pi (d + t), according to the pythagorean theorem, if the spiral ACB is on the first layer of spiral layer, the length of the spiral ACB is equal to the length of the first layer of spiral layer
If in the second layer, its length
A third layer, a fourth layer and a fifth layer,
… …, and so on, if the spiral ACB is located on the n-th spiral layer, its length
Because the input is connected to the head end on first layer spiral layer, the trailing end connection output on last layer spiral layer, the flexbile plate curls, the spiral of disconnection is connected with connecting hole 11 through boss spliced pole 12 in the same spiral layer, the spiral of last layer spiral layer tail end is connected with the spiral of next layer spiral layer head end, make and form the route between input and the output, and the flexbile plate curls curved shape and becomes multilayer structure, next spiral layer sets up the skin on last spiral layer, superpose layer upon layer to form coil 1.
In this embodiment, spiral on the flexbile plate is through tiling copper back of covering copper, and the copper line of an individual disconnection is formed to rethread photoetching sculpture, and the copper line position is certain, arranges to establish the precision height, is favorable to improving coil 1's stability. The connecting hole 11 at the upper end of the spiral is formed by laser cutting or breakdown to penetrate through the flexible board, and the boss connecting column 12 at the lower end of the spiral is welded with copper foil on the basis of copper cladding to form a boss. In the flexible plate curling process, the boss connecting column 12 is inserted into the connecting hole 11, the threads of the same thread layer are connected, the connection of the boss connecting column 12 and the connecting hole 11 is fixed, the performance of the coil is stabilized, the boss connecting column 12 is welded and fixed at the connecting point of the boss connecting column 12 and the connecting hole 11, and the boss connecting column 12 is guaranteed not to be separated from the connecting hole 11.
The material of the flexible plate is polyimide. The polyimide film is formed by casting a polyamic acid solution into a film, stretching the film, and then imidizing the film at a high temperature. The polyimide film is yellow and transparent, has outstanding high temperature resistance, radiation resistance, chemical corrosion resistance and electrical insulation performance, can not expand and break at the temperature of 200 ℃, has high tensile strength, has elastic modulus second to that of carbon fiber, has high glass transition temperature, and is particularly suitable for being used as an insulating material of a flexible printed circuit board substrate and various high-temperature resistant motor electrical appliances. In the invention, the flexible board adopts polyimide, so that the flexible board is suitable for processes such as copper-clad tapping and the like, and has excellent curling capability and tensile strength, thereby being beneficial to forming a plurality of layers of closely-arranged spirals and curling to form the multilayer coil 1. After the flexible board is curled, the material can also fix the curling degree of the flexible board through simple rubberizing, and the flexible board is ensured not to be scattered so as to maintain the shape and the structure of the coil 1.
An LVDT linear displacement sensor with flexible board wiring is disclosed, as shown in fig. 6 and 7, comprising the above-mentioned coil 1 with flexible board wiring, wherein an outer sleeve 3 is provided outside the coil 1, an inner sleeve 2 is provided inside the coil 1, the coil 1 is disposed inside a space surrounded by the two sleeves, and two ends of the coil are respectively provided with an end cap 4 for sealing. Since the LVDT linear displacement sensor generally includes one primary winding 11 and two secondary windings 12, the two secondary windings 12 form a voltage difference by changing the relative positions of the iron core 5 and the two secondary windings 12. In the present embodiment, the primary coil 11 and the secondary coil 12 are each formed by rolling a flexible board.
In one embodiment, as shown in fig. 8, the primary coil 11, the first secondary coil and the second secondary coil are arranged side by side between the inner sleeve 2 and the outer sleeve 3, and even three sets of spiral layers of the coils 1 can be arranged side by side on the same flexible board and curled to form three sets of coils side by side. The primary winding 11 is disposed between the two secondary windings 12 and is connected to different input terminals and output terminals, respectively. The two ends of the primary coil 11 are connected with power supply electrodes, the two secondary coils 12 are used as signal output ends to be connected with an external circuit, and the iron core 5 is arranged inside the inner sleeve 2. The iron core 5 is moved to change the position of the iron core relative to the two secondary coils 12, so that induced voltage is formed and a signal is output.
In one embodiment, as shown in fig. 9 and 10, three sets of spiral layers of coils are arranged on the same flexible board, wherein the first spiral layer is connected with the second spiral layer, and the second spiral layer is disconnected with the third spiral layer. The flexible plate curls, and the connecting hole is connected with the boss spliced pole, and first layer spiral layer and second floor spiral layer form primary 11, and the third layer spiral layer is equallyd divide, and half left side forms first secondary coil, and half right side forms second secondary coil, and first secondary coil parallels with second secondary coil, sets up in primary 11's the outside. In the third layer of spiral layer, the input end of the first secondary coil and the output end of the second secondary coil are respectively arranged at the head end of the next spiral and the tail end of the previous spiral, and the flexible plate is curled and connected with the first secondary coil and the second secondary coil to enable the input end of the first secondary coil to be connected with the output end of the second secondary coil.
By analogy, a plurality of spiral layers in front of the flexible board are connected and are regarded as a large coil spiral layer, the rest spiral layers are divided in half and are regarded as two small coil spiral layers, and the flexible board is curled to form a primary coil 11 and two secondary coils 12 respectively. The flexible board is placed in the space surrounded by the inner sleeve 2 and the outer sleeve 3, an iron core 5 is inserted in the middle, the iron core 5 is moved, the positions of the iron core 5 relative to the two secondary coils 12 are changed, induction voltage is formed, and signals are output.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (7)
1. A coil for wiring of a flexible board is characterized in that a plurality of layers of spiral layers are laid on the flexible board, and each layer of spiral layer is provided with a plurality of unconnected spirals;
the flexible sheet is rolled such that,
in the thread layer of the same layer, the tail end of the last thread is connected with the head end of the next thread,
the spiral thread at the tail end of the spiral thread layer on the upper layer is connected with the spiral thread at the head end of the spiral thread layer on the lower layer between different spiral thread layers;
two ends of each spiral are respectively provided with a connecting hole and a boss connecting column, and the boss connecting columns are inserted into the connecting holes and connected with two adjacent spirals;
any of the layers of spirals are parallel to each other and any of the spirals are parallel to each other;
spacing s between the spirals of the same layer of the spiral layer, thickness t of the flexible sheet, length l of the spiral, wrapThe diameter d of the enameled wire and the number n of the spiral layers simultaneously meet the requirements
。
2. A flexible board routing coil as claimed in claim 1 wherein said spirals are inclined, the trailing end of the previous spiral being disposed on the same vertical line as the leading end of the next spiral.
3. The flexible printed circuit board wiring coil according to claim 1, wherein one end of the spiral is cut to form the connection hole, the other end of the spiral is welded to form the boss connection post, and the boss connection post is inserted into the connection hole and welded and fixed.
4. The flexible board wired coil according to claim 1, wherein the flexible board material comprises polyimide, and the flexible board is copper-clad and then photo-etched to form a plurality of unconnected spirals.
5. A linear displacement transducer of a flexible-plate-wired LVDT, comprising a flexible-plate-wired coil according to any of the claims 1-4, wherein the flexible-plate-wired coil is provided with a sleeve inside and outside, and the two ends of the sleeve are sealed by end caps.
6. The LVDT linear displacement transducer of flexible board wiring according to claim 5, comprising three sets of flexible board wiring coils, wherein one set of flexible board wiring coils is connected to a power supply electrode, and the other two sets of flexible board wiring coils are connected to an external circuit as signal output terminals.
7. The linear LVDT sensor according to claim 5, wherein the coils of the flexplate wire are arranged side by side in a space defined by an inner sleeve, an outer sleeve, and the end caps at both ends, and an iron core is disposed in the inner sleeve.
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| CN202010499020.3A CN111721330B (en) | 2020-06-04 | 2020-06-04 | Coil and LVDT linear displacement sensor of flexbile plate wiring |
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| CN202010499020.3A CN111721330B (en) | 2020-06-04 | 2020-06-04 | Coil and LVDT linear displacement sensor of flexbile plate wiring |
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| US5848213A (en) * | 1997-06-30 | 1998-12-08 | Litton Systems, Inc. | Low shupe bias fiber optic rotation sensor coil |
| JP4478948B2 (en) * | 2005-01-28 | 2010-06-09 | 株式会社フジクラ | Coil parts |
| CN203104163U (en) * | 2012-12-31 | 2013-07-31 | 葛建勇 | A coreless motor coil winding |
| CN205542318U (en) * | 2016-03-25 | 2016-08-31 | 上海联影医疗科技有限公司 | Transformer winding and transformer based on flexible circuit board |
| JP2020038865A (en) * | 2018-09-03 | 2020-03-12 | イビデン株式会社 | Coil substrate for motor, and method of manufacturing the same |
| CN209485259U (en) * | 2019-04-22 | 2019-10-11 | 深圳市森瑟科技发展有限公司 | High pressure resistant strong, anti-vibration LVDT linear displacement transducer |
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