Measurement working surface correction method and system of composite material thickness gauge

Abstract

The invention discloses a method and a system for correcting a measuring working surface of a composite material thickness gauge, and belongs to the technical field of composite material testing. In order to solve the problem that the traditional thickness gauge is limited in measurement precision and correction range, the invention mainly adopts the laser light source emission and reception, the light interference principle and the design of the separated laser generator and receiver. By determining the relative position of the reference plane and the measurement working surface and correcting the measurement working surface by using the light cross interference phenomenon, the measurement precision can be improved, the correction range can be expanded, and the accuracy and stability of composite material measurement can be ensured. According to the invention, high-precision and widely applicable composite material thickness measurement can be realized, the error problem in a traditional method is solved, and the measurement efficiency and the data reliability are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material testing, and particularly relates to a method and system for calibrating the measurement working surface of a composite material thickness gauge. Background Art

[0002] With the continuous in-depth research on the low-cost, multi-functional, and intelligent aspects of composite materials, it is required that the design, manufacturing, testing, and R & D iteration speed of composite materials be faster, the data collection be more comprehensive, and the cost be lower. To meet these requirements, composite material products need to undergo a variety of tests and a large amount of data collection, which poses great challenges to rapid testing and low-cost testing. The shape and thickness dimensions are one of the conventional key indicators of composite materials. It not only relates to the shape stability and the smooth installation of assembled components, but also directly affects the quality of stealth performance. At the same time, it is also the core indicator to ensure the uniformity and stability of each position of the product. However, thickness measurement, especially micro-thickness measurement, requires a large amount of data collection. Generally, more than 5 points are tested per centimeter. For example, when measuring a 3m×3m plate, the data volume may exceed 5000. It is almost impossible to rely on manual data collection and analysis. Therefore, a thickness gauge with automatic data collection and intelligent analysis has become an ideal choice. It can record thickness data, display the data distribution through different curves, represent the size distribution using a cloud map, and remind the operator whether it exceeds the predetermined value through a warning message. This will speed up the feedback speed of test results and promote the rapid iteration of design and R & D.

[0003] However, thickness gauges generally adopt contact measurement principles such as electromagnetic and mechanical contacts or non-contact measurement principles such as light, electroacoustics, etc., and require the specimen to be fixed on a platform or a theoretical plane. Although the method of fixing with a theoretical plane is applicable to products and places with different structures, this form of plane is usually spliced by steel wires or steel plates, and there are problems such as poor plane stability, low flatness, and large occupied space, and no significant advantages are brought. Summary of the Invention

[0004] The purpose of the present invention is to provide a solution for calibrating the measurement working surface of a thickness gauge for composite materials, which can easily calibrate the measurement working surface of the thickness gauge and reduce the operation difficulty and cost.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for calibrating the measurement working surface of a composite material thickness gauge, comprising the following steps:

[0007] For the reference plane of the thickness gauge, at least two laser light sources are provided on one side edge, each laser light source contains two horizontal laser generators with different orientations, and at least two laser receivers are provided on the opposite side edge; turn on one laser generator of each laser light source, emit two laser beams and make them cross; adjust the two laser receivers to receive the interference spots of the two laser beams; determine the reference plane through the above laser generators and receivers;

[0008] Turn on the other laser generator of each laser light source, emit two laser beams to the measurement working surface and make them cross, set at least two laser receivers on the front optical path, adjust the laser receivers to receive the interference spots of the two laser beams; then set at least one laser generator on one side edge of the measurement working surface, emit a laser beam and make it interfere with the above two laser beams, set at least one laser receiver on the other side edge, adjust this laser receiver to receive the interference spot of this laser beam; determine the corrected measurement working surface through the above lasers and receivers.

[0009] Further, the laser generator and the laser receiver adopt a separated structure design or a combined structure design.

[0010] Further, the positions where the laser generators and laser receivers of the reference plane and the measurement working surface are the fulcrum positions. At the fulcrum positions, fix the laser generators and laser receivers by setting mobile brackets, and adjust the height and angle of the laser generators and laser receivers through the mobile brackets.

[0011] Further, the mobile bracket includes a base, a large-size height adjuster, a height fine adjuster and a direction adjuster.

[0012] Further, the mobile bracket on the measurement working surface further includes a load fixing platform.

[0013] Further, the material of the mobile bracket is selected from hard plastics, metals or carbon materials, and rigid connections are used between the components.

[0014] Further, the diameter of the laser beam emitted by the laser generator is within 10 mm, and the color is red or green.

[0015] Further, the diameter of the laser beam emitted by the laser generator is 1 - 3 mm, and the color is red.

[0016] A measurement working surface correction system for a composite material thickness gauge, comprising:

[0017] At least two laser light sources and at least two laser receivers located on the reference plane of the thickness gauge, where the laser light sources are arranged on one side edge and the laser receivers are arranged on the opposite side edge; each laser light source contains two horizontal laser generators with different orientations. A beam of laser emitted by one laser generator of each laser light source is received by the laser receiver on the corresponding optical path, and the two beams of laser intersect and interfere; the other laser generator of each laser light source is used to emit a beam of laser towards the measurement working surface, and the two beams of laser intersect and interfere.

[0018] At least one laser generator and at least three laser receivers located on the measurement working surface, where at least two laser receivers are used to receive the laser emitted by the laser light source on the reference plane; the remaining at least one laser receiver forms a group with the above at least one laser generator and is respectively arranged on two opposite side edges of the measurement working surface, where the laser emitted by the laser generator interferes with the laser emitted by the laser light source on the reference plane, and the interference spot is received by the laser receiver.

[0019] Furthermore, it also includes a mobile support for adjusting and fixing the laser generators and laser receivers on the reference plane and the measurement working surface. It includes a base, a large-size height adjuster, a height fine adjuster, and a direction adjuster; the mobile support on the measurement working surface also includes a load fixing platform.

[0020] The beneficial effects achieved by the present invention are as follows:

[0021] 1. By calibrating the reference plane and the measurement working surface, the present invention ensures high precision and high stability of the thickness gauge when measuring composite materials.

[0022] 2. Utilizing the cross-interference phenomenon of laser light rays, the present invention accurately determines the relative position between the reference plane and the measurement working surface, avoiding the errors and instabilities of traditional methods.

[0023] 3. Adopting the design of laser generators and receivers, the present invention can flexibly adjust the position and direction of laser light rays, improving the applicability and precision of the system.

[0024] 4. The present invention provides a mobile support structure with high precision and easy adjustment, supporting large-size coarse adjustment and fine adjustment, ensuring the stability and accuracy of laser generators and receivers.

[0025] 5. By means of light ray expansion and reception feedback, the present invention successfully applies the local plane calibration method to a large-area load platform, expanding the calibration range and improving the measurement efficiency.

[0026] 6. The present invention is applicable to the measurement of various resin-based composite materials, including epoxy resin-based carbon fiber composite materials, unsaturated resin-based glass fiber composite materials, etc., and has a wide range of application prospects.

[0027] 7. The present invention can effectively solve problems such as limited measurement range and inaccurate calibration of existing thickness gauges, and improve the reliability and accuracy of measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram for determining the reference plane and calibrating the measurement working surface in Embodiment 1.

[0029] Figure 2 It is a structural diagram of the mobile support in Embodiment 1.

[0030] Figure 3 It is a schematic diagram for determining the reference plane and calibrating the measurement working surface in Embodiment 2.

[0031] Figure 4 It is a structural diagram of the mobile support in Embodiment 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical features and advantages or technical effects in the above technical solutions of the present invention more obvious and understandable, the following will be described in detail with reference to the embodiments.

[0033] Embodiment 1

[0034] This embodiment specifically discloses a method and system for calibrating the measurement working surface of a composite material thickness gauge. The laser generator and receiver used are designed with a split structure, and the reference plane is determined and the measurement working surface is calibrated, as Figure 1 shown. Among them, the reference plane is a preset plane where the thickness gauge probe is located, and the measurement working surface is calibrated based on this reference plane. The measurement working surface is the plane where the composite material sample to be measured is placed, and it needs to be calibrated to be in the same plane as the reference plane through calibration, so as to ensure the measurement accuracy of the thickness gauge for the sample. The operation instructions for calibrating the measurement working surface are as follows:

[0035] 1. Determination of the reference plane: Two light sources are arranged on one side edge within the reference plane, and each light source is equipped with two laser generators with exactly the same height and angle, which are used to align the reference plane with the measurement working surface. Two laser receivers are arranged at two corners on the other side edge. Turn on the laser generators of the two light sources, and the two emitted laser beams are received by the diagonal laser receivers. When the two laser beams cross and form interference, the plane where they are located is the reference plane. After determining the reference plane, the laser generators and receivers are fixedly connected together with the thickness gauge to ensure the stable existence of the reference plane. In other embodiments, three or more light sources can be arranged on one side edge within the reference plane, and three or more laser receivers can be arranged on the other side edge, and the number of laser receivers is the same as the number of light sources.

[0036] 2. Calibration of the measurement working surface: After determining the reference plane, turn on the other two laser generators of its two light sources. These two laser generators emit two laser beams towards the measurement working surface and intersect. Two laser receivers are set at the two fulcrum positions on the edge of the measurement working surface far from the reference plane, and their positions are adjusted to receive these two laser beams. Then, a laser generator and a laser receiver are respectively set at the two fulcrum positions on the diagonal of the measurement working surface. The laser generator emits laser light, which is received by the laser receiver. By adjusting the emission position and angle, interference is formed with the aforementioned two laser beams, and thus the calibrated measurement working surface can be jointly determined. After calibrating the measurement working surface, fix the laser generator and receiver. There is no need to fix them to the thickness gauge with each other, but it is necessary to ensure the accurate emission and reception of light. In other embodiments, two or more laser generators and two or more laser receivers can be respectively set at the two fulcrum positions on the diagonal of the measurement working surface, and the number of laser receivers is the same as the number of light sources.

[0037] The laser receiver verifies the reception of the light spot through the screen. If the light spot cannot be received, it is necessary to adjust the height, position and direction of the laser generator. By observing the light spot interference phenomenon, ensure that the light is accurately aligned. The diameter of the laser beam should be controlled within 10 mm, preferably 1 - 3 mm. The light color can be selected as red or green, preferably red.

[0038] Optionally, the laser generators and receivers of the reference plane and the measurement working surface can be jointly connected to a control system. Through this control system, the laser emission, angle and height adjustment of the laser generator can be controlled, and the angle, height adjustment, interference light spot reception and remote observation of the laser receiver can be controlled. However, this control system is not necessary. In the absence of a control system, the laser emission, angle and height adjustment of the laser generator, as well as the angle, height adjustment, interference light spot reception and observation of the laser receiver can be carried out manually.

[0039] 3. Fixing of the mobile support: It can be used as Figure 2The area enclosed by the shown mobile support is used as a reference plane and a measurement working surface. By setting it at the fulcrum position, the position and direction adjustment and fixation of the laser generator and the receiver are realized. The structure of the mobile support mainly includes a base 11, a large-size height adjuster 12, a height fine adjuster 13, and a direction adjuster 14, which are used to adjust and fix the laser generator or the receiver 16. On the measurement working surface, there is also a load fixing platform 15. Among them, the large-size height adjuster 12 is used for roughly adjusting the large-size height through a spiral structure, the height fine adjuster 13 is used for finely adjusting the height, the direction adjuster 14 is used for adjusting the laser emission direction, and the load fixing platform 15 is used as a physical measurement working surface for placing the sample to be measured. The adjustment accuracy of the support is not greater than 0.02 mm or 0.1°. The materials used for the support can be materials that are not easily deformed, such as hard plastics, metals, or carbon materials. Preferably, metal materials such as cemented carbide and stainless steel are used. There can be fixing forms such as screw fastening and thermoplastic bonding on the support to form a rigid connection.

[0040] The composite material measured by the thickness gauge can be a resin-based composite material, such as an epoxy resin-based carbon fiber composite material, an unsaturated resin-based glass fiber composite material, or an epoxy resin-based aramid fiber composite material. Specifically, it can be honeycomb, foam sandwich materials, etc.

[0041] Embodiment 2

[0042] This embodiment specifically discloses a method for calibrating the measurement working surface of a composite material thickness gauge. The laser generator and the receiver used are of a combined structure design for determining the reference plane and calibrating the measurement working surface, as Figure 3 shown. The entire operation process of calibrating the measurement working surface is basically the same as that in Embodiment 1 and will not be elaborated here.

[0043] The structure of the corresponding mobile support used is as Figure 4 shown, including a base 21, a large-size height adjuster 22, a height fine adjuster 23, and a direction adjuster 24, which are used to adjust and fix the laser generation receiver 26. On the measurement working surface, there is also a load fixing platform 25. The functions of each part are basically the same as those of the mobile support in Embodiment 1 and will not be elaborated here.

[0044] Although the present invention has been disclosed as above with embodiments, it is not intended to limit the present invention. Appropriate modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall all be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to that defined by the claims.

Claims

1. A method for calibrating the measuring working surface of a composite material thickness gauge, characterized in that: The following steps are involved: For the reference plane of the thickness gauge, at least two laser light sources are arranged on one edge, each laser light source contains two horizontal laser generators facing in different directions, and at least two laser receivers are arranged on the opposite edge; one laser generator of each laser light source is turned on to emit two laser beams and make them cross; the interference spots of the two laser beams are received by adjusting the two laser receivers; the reference plane is determined by the above laser generators and receivers; Turn on the other laser generator of each laser light source, emit two laser beams to the measuring work surface and make them cross, set at least two laser receivers on the front optical path, and receive the interference light spots of the two laser beams by adjusting the laser receivers; then set at least one laser generator on one side edge of the measuring work surface, emit a laser beam and interfere with the above two laser beams, set at least one laser receiver on the other side edge, and receive the interference light spot of the laser beam by adjusting the laser receiver; determine the corrected measuring work surface by the above lasers and receivers.

2. The method according to claim 1, characterized in that The laser generator and the laser receiver adopt a separate structure design or a combined structure design.

3. The method according to claim 1, characterized in that The positions of the laser generator and the laser receiver of the reference plane and the measuring work surface are the fulcrum positions. The laser generator and the laser receiver are fixed by setting a movable bracket at the fulcrum position, and the height and angle of the laser generator and the laser receiver are adjusted by the movable bracket.

4. The method according to claim 3, characterized in that The mobile stand includes a base, a large height adjuster, a fine height adjuster, and an orientation adjuster.

5. The method according to claim 4, characterized in that The mobile support on the measuring work surface also includes a load fixing platform.

6. The method according to claim 5, characterized in that The material of the mobile bracket is hard plastic, metal or carbon material, and rigid connections are adopted between various components.

7. The method according to claim 1, characterized in that The diameter of the laser emitted by the laser generator is within 10mm and the color is red or green.

8. The method according to claim 7, characterized in that The laser emitted by the laser generator has a diameter of 1-3 mm and is red in color.

9. A measurement working surface correction system for a composite material thickness gauge, characterized in that: include: At least two laser light sources and at least two laser receivers are located on the reference plane of the thickness gauge, wherein the laser light source is arranged on one side edge and the laser receiver is arranged on the opposite side edge; each laser light source contains two horizontal laser generators facing in different directions, a laser beam emitted by a laser generator of each laser light source is received by a laser receiver on the optical path thereof, and the two laser beams cross-interfere; another laser generator of each laser light source is used to emit a laser beam toward the measuring working surface, and the two laser beams cross-interfere; At least one laser generator and at least three laser receivers are located on the measuring work surface, wherein at least two laser receivers are used to receive lasers emitted by the laser light source of the reference plane; the remaining at least one laser receiver is grouped with the at least one laser generator and respectively arranged at two opposite side edges of the measuring work surface, wherein the laser emitted by the laser generator interferes with the laser emitted by the laser light source of the reference plane, and the interference light spot is received by the laser receiver.

10. The system according to claim 9, characterized in that It also includes a movable bracket for adjusting and fixing the laser generator and laser receiver of the reference plane and the measuring work surface, which includes a base, a large-size height adjuster, a height fine adjuster and a direction adjuster; the movable bracket on the measuring work surface also includes a load fixing platform.

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