CN112146582A

CN112146582A - Thickness measuring method, device, equipment and storage medium

Info

Publication number: CN112146582A
Application number: CN201910582540.8A
Authority: CN
Inventors: 袁益楚; 张烘州; 黄志斌; 何方舟; 张习芳
Original assignee: Shanghai Aircraft Manufacturing Co Ltd
Current assignee: Shanghai Aircraft Manufacturing Co Ltd
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2020-12-29

Abstract

The embodiment of the invention discloses a thickness measuring method, a device, equipment and a storage medium. The method comprises the steps of obtaining a first reference measurement value fed back by a first laser displacement sensor based on a first reference surface and a second reference measurement value fed back by a second laser displacement sensor based on a second reference surface; synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move, and acquiring a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time; determining a first moving distance and a first measured value according to whether the first initial measured value is within a first measuring range; determining a second moving distance and a second measured value according to whether the second initial measured value is within a second measuring range; and calculating the thickness of the measured object. The technical scheme provided by the embodiment of the invention can realize non-contact measurement and can directly obtain the thickness of the measured point of the measured object.

Description

Thickness measuring method, device, equipment and storage medium

Technical Field

The embodiment of the invention relates to the technical field of thickness measurement, in particular to a thickness measurement method, device and equipment and a storage medium.

Background

The aircraft skin is a dimensional component which is wrapped outside an aircraft framework structure and is fixed on the framework by using an adhesive or rivets to form the aerodynamic shape of the aircraft. In the riveting assembly process of the modern aircraft, the surface quality (such as high strength, good plasticity, smooth surface and high corrosion resistance) and the thickness of the aircraft skin are important technical indexes influencing the riveting quality, and the quality of the riveting quality directly influences the aerodynamic performance, the fuel economy, the fatigue life and the safety of the aircraft, so the surface quality and the thickness of the aircraft skin are extremely important in the aircraft assembling and manufacturing process.

At present, effective solutions have been provided in the prior art to enable the surface quality of the aircraft skin to meet requirements, but for the thickness of the aircraft skin, the measurement of the thickness of the aircraft skin is difficult because the appearance of the aircraft skin is complex. At present, a contact sensor is generally used for measurement, but with the contact sensor, only the coordinates of a measurement point can be obtained, the thickness of the aircraft skin cannot be directly measured, and the surface of the aircraft skin is easily scratched, so that the aerodynamics of the aircraft is affected.

Disclosure of Invention

The invention provides a thickness measuring method, a device, equipment and a storage medium, which are used for realizing non-contact measurement and directly obtaining the thickness of a measuring point of a measured object.

In a first aspect, an embodiment of the present invention provides a thickness measurement method, including:

acquiring a first reference measurement value fed back by a first laser displacement sensor based on a first reference surface and a second reference measurement value fed back by a second laser displacement sensor based on a second reference surface; the first reference measurement value is in a first measurement range of the first laser displacement sensor, and the second reference measurement value is in a second measurement range of the second laser displacement sensor;

synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move, and acquiring a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time;

determining a first moving distance of the first laser displacement sensor along the first direction and a first measured value fed back by the first laser displacement sensor based on the first moving distance according to whether the first initial measured value is located in a first measuring range; determining a second moving distance of the second laser displacement sensor along the first direction and a second measuring value fed back by the second laser position sensor based on the second moving distance according to whether the second initial measuring value is located in a second measuring range;

calculating the thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction;

wherein the first reference surface and the second reference surface are parallel; the first direction is perpendicular to the first reference plane.

In a second aspect, an embodiment of the present invention further provides a thickness measuring apparatus, including: the device comprises a first reference measurement value and second reference measurement value acquisition module, a synchronous movement module, a first initial measurement value and second initial measurement value acquisition module, a first movement distance and first measurement value determination module, a second movement distance and second measurement value determination module and a calculation module;

the first reference measurement value and second reference measurement value acquisition module is used for acquiring a first reference measurement value fed back by the first laser displacement sensor based on the first reference surface and a second reference measurement value fed back by the second laser displacement sensor based on the second reference surface; the first reference measurement value is in a first measurement range of the first laser displacement sensor, and the second reference measurement value is in a second measurement range of the second laser displacement sensor;

the synchronous moving module is used for synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move;

the first initial measurement value and second initial measurement value acquisition module is used for acquiring a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time;

the first moving distance and first measurement value determining module is used for determining a first moving distance of the first laser displacement sensor along the first direction and a first measurement value fed back by the first laser displacement sensor based on the first moving distance according to whether the first initial measurement value is located in a first measurement range;

the second moving distance and second measured value determining module is used for determining a second moving distance of the second laser displacement sensor along the first direction and a second measured value fed back by the second laser position sensor based on the second moving distance according to whether the second initial measured value is located in a second measuring range;

the calculating module is used for calculating the thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction;

In a third aspect, an embodiment of the present invention further provides an apparatus, including:

one or more processors;

storage means for storing one or more programs;

when executed by one or more processors, cause the one or more processors to implement a thickness measurement method as described in any of the embodiments of the present invention.

In a fourth aspect, embodiments of the present invention further provide a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a thickness measurement method according to any one of the embodiments of the present invention.

According to the thickness measuring method provided by the embodiment of the invention, a first reference measurement value fed back by a first laser displacement sensor based on a first reference surface is obtained as a reference. And then controlling the first laser displacement sensor and the second laser displacement sensor to move to obtain a first measurement value fed back by the first laser displacement sensor based on the first surface of the measured object and a second measurement value fed back by the second laser displacement sensor based on the second surface of the measured object. And finally, calculating the thickness of the measured object according to the reference, the first measured value and the second measured value. Because the first laser displacement sensor and the second laser displacement sensor are non-contact sensors, the surface of the measured object cannot be damaged. The method solves the problems that the surface of the measured object is easy to scratch and the thickness of the measured point of the measured object cannot be directly obtained, and achieves the effects of non-contact measurement and directly obtaining the thickness of the measured point of the measured object.

Drawings

Fig. 1 is a flowchart of a thickness measuring method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a thickness measurement according to an embodiment of the present invention;

fig. 3 is a flowchart of a thickness measuring method according to a second embodiment of the present invention;

fig. 4 is a flowchart of a thickness measuring method according to a third embodiment of the present invention;

fig. 5 is a schematic diagram of movement of a first laser displacement sensor and a second laser displacement sensor according to a third embodiment of the present invention;

fig. 6 is a schematic diagram of a measurement result of continuous measurement of a measured object according to a third embodiment of the present invention;

fig. 7 is a structural diagram of a thickness measuring apparatus according to a fourth embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an apparatus according to a fifth embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a flowchart of a thickness measurement method according to an embodiment of the present invention, which is applicable to the case of measuring the thickness of an aircraft skin. In particular, the thickness measurement may be performed by a thickness measurement device, which may be implemented in software and/or hardware, and integrated in the terminal. Further, the terminal includes, but is not limited to: desktop computers, notebook computers, tablet computers and other intelligent terminals.

Referring to fig. 1, the method specifically includes the following steps:

and S110, acquiring a first reference measurement value fed back by the first laser displacement sensor based on the first reference surface and a second reference measurement value fed back by the second laser displacement sensor based on the second reference surface.

Among them, the laser displacement sensor usually has two parameters of reference distance and measuring range. The reference distance is when the distance between the laser displacement sensor and the measured surface is the reference distance when the measured value fed back by the laser displacement sensor based on the measured surface is 0. The measurement range refers to that when the distance between the laser displacement sensor and the measured surface is within a certain preset range, the laser displacement sensor can feed back a measured value based on the surface of the measured object, when the distance between the laser displacement sensor and the measured surface exceeds the preset measurement range, the laser displacement sensor cannot feed back the measured value based on the surface of the measured object, and the preset range minus the reference distance is the measurement range. Specifically, the first laser displacement sensor is provided with a first measurement range and a first reference distance; the second laser displacement sensor has a second measurement range and a second reference distance.

For example, the laser displacement sensor with model number LK-H025 has a reference distance of 20mm and a measurement range of + -3mm, i.e. the distance between the laser displacement sensor and the measured surface is in the range of 17mm-23mm, the laser displacement sensor can feed back the measured value based on the measured surface.

The first reference surface is parallel to the second reference surface, the laser emitted by the first laser displacement sensor and the laser emitted by the second laser displacement sensor are on the same straight line, and the first reference surface is perpendicular to the laser emitted by the first laser displacement sensor. The first reference measurement value is within a first measurement range of the first laser displacement sensor and the second reference measurement value is within a second measurement range of the second laser displacement sensor.

For example, fig. 2 is a schematic diagram of a thickness measurement according to a first embodiment of the present invention. The first laser displacement sensor 21 and the second laser displacement sensor 22 may be adjusted in a direction perpendicular to the first reference plane (i.e. the first direction 10) such that the first reference measurement value is 0 and the second reference measurement value is 0, i.e. the distance between the first laser displacement sensor 21 and the first reference plane 41 is the reference distance of the first laser displacement sensor 21 and the distance between the second laser displacement sensor 22 and the second reference plane 42 is the reference distance of the second laser displacement sensor 22.

And S120, synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move, and acquiring a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time.

Specifically, the first laser displacement sensor 21 and the second laser displacement sensor 22 are synchronously controlled to move, so that the laser emitted by the first laser displacement sensor 21 and the laser emitted by the second laser displacement sensor 22 are always on the same straight line. When the first laser displacement sensor 21 and the second laser displacement sensor 22 move to the measurement point of the measured object (for example, the light spot of the laser emitted by the first laser displacement sensor 21 coincides with the measurement point a, and the light spot of the laser emitted by the second laser displacement sensor 22 coincides with the measurement point a'), the measured object is located in the opposite-emission area of the first laser displacement sensor 21 and the second laser displacement sensor 22, the first laser displacement sensor 21 feeds back the first initial measurement value based on the first surface 11 of the measured object, and the second laser displacement sensor 22 feeds back the second initial measurement value based on the second surface 21 of the measured object.

S130, determining a first moving distance of the first laser displacement sensor along the first direction and a first measurement value fed back by the first laser displacement sensor based on the first moving distance according to whether the first initial measurement value is located in a first measurement range; and determining a second moving distance of the second laser displacement sensor along the first direction according to whether the second initial measurement value is located in a second measurement range or not, and a second measurement value fed back by the second laser position sensor based on the second moving distance.

Specifically, when the first laser displacement sensor 21 and the second laser displacement sensor 22 are translated to the measurement point of the measured object (for example, the light spot of the laser emitted by the first laser displacement sensor 21 coincides with the measurement point a, and the light spot of the laser emitted by the second laser displacement sensor 22 coincides with the measurement point a'), if the distance between the first laser displacement sensor 21 and the first surface 41 of the measured object exceeds the range obtained by adding the first reference distance of the first laser displacement sensor 21 and the first measurement range, the first laser displacement sensor 21 cannot feed back the measurement value based on the first surface 41 of the measured object, that is, the obtained first initial measurement value is an error value. At this time, it is necessary to control the first laser displacement sensor 21 to move the first moving distance along the first direction 10, so that the first laser displacement sensor 21 can feed back a measurement value based on the first surface 41 of the object to be measured, where the measurement value is the first measurement value. If the distance between the first laser displacement sensor 21 and the first surface 41 of the measured object does not exceed the range obtained by adding the first reference distance of the first laser displacement sensor 21 and the first measurement range, the first laser displacement sensor 21 can feed back a measurement value based on the first surface 41 of the measured object, and the measurement value is a first initial measurement value and is also a first measurement value. The same applies to the second laser displacement sensor 22, and will not be described herein.

Specifically, the first movement distance has a positive or negative sign, and the positive or negative sign is used to indicate the movement direction of the first laser displacement sensor 21. Illustratively, the first laser displacement sensor 21 moves in a direction away from the first reference surface 41, and the obtained first movement distance is a positive number, and the first laser displacement sensor 21 moves in a direction close to the first reference surface 41, and the obtained first movement distance is a negative number. The second moving distance is the same, and the description is omitted here.

And S140, calculating the thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction.

Specifically, according to the first reference measurement value, the second reference measurement value, and the distance between the first reference surface and the second reference surface along the first direction, the distance between the first laser displacement sensor and the second laser displacement sensor before the first laser displacement sensor and the second laser displacement sensor do not move to the measurement point of the measured object can be calculated. Then, the distance between the first laser displacement sensor and the second laser displacement sensor when the first laser displacement sensor and the second laser displacement sensor feed back the first measurement value and the second measurement value can be calculated according to the first moving distance and the second moving distance. And finally, calculating the thickness of the measured point of the measured object according to the first measured value and the second measured value.

It is understood that the repeated execution of S120-S140 may achieve continuous measurement of the thickness of the object to be measured.

Example two

Fig. 3 is a flowchart of a thickness measuring method according to a second embodiment of the present invention, which is embodied on the basis of the second embodiment. Specifically, referring to fig. 3, the method specifically includes the following steps:

s210, controlling the first laser displacement sensor or the second laser displacement sensor to move so that the light spot of the first laser beam emitted by the first laser displacement sensor coincides with the light spot of the second laser beam emitted by the second laser displacement sensor.

S220, placing a reference object with known thickness in the correlation area of the first laser displacement sensor and the second laser displacement sensor.

Wherein the upper surface of the reference object is perpendicular to the first laser beam and the lower surface of the reference object is perpendicular to the second laser beam; the reference object includes a gauge block of known thickness or a portion of the object under test of known thickness.

And S230, determining that the plane of the upper surface of the reference object is a first reference plane, and the plane of the lower surface of the reference object is a second reference plane.

Specifically, with reference to fig. 2, if the reference object is the gauge block 31, the surface of the gauge block 31 facing the first laser displacement sensor 21 is the upper surface 311, and the surface of the gauge block 31 facing the second laser displacement sensor 22 is the lower surface 312. If the reference object is a part of the measured object with known thickness, the plane of the part of the measured object with known thickness in the first surface 41 is the upper surface of the reference object, and the plane of the part of the measured object with known thickness in the second surface 42 is the lower surface of the reference object.

S240, obtaining a first reference measurement value fed back by the first laser displacement sensor based on the first reference surface and a second reference measurement value fed back by the second laser displacement sensor based on the second reference surface.

The first reference measurement value is in a first measurement range of the first laser displacement sensor, and the second reference measurement value is in a second measurement range of the second laser displacement sensor.

And S250, synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move, and acquiring a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time.

S260, when the first initial measurement value exceeds a first measurement range, controlling the first laser displacement sensor to move along a first direction until the first initial measurement value fed back by the first laser displacement sensor is in the first measurement range; determining the moving distance of the first laser displacement sensor along the first direction as a first moving distance, and determining a first initial measurement value fed back by the first laser displacement sensor based on the first moving distance as a first measurement value; when the first initial measurement value is within the first measurement range, determining that the first moving distance is zero, and determining that the first initial measurement value is the first measurement value.

S270, when the second initial measurement value exceeds a second measurement range, the second laser displacement sensor is controlled to move along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range; determining the moving distance of the second laser displacement sensor along the first direction as a second moving distance, and determining a second initial measurement value fed back by the second laser displacement sensor based on the second moving distance as a second measurement value; when the second initial measurement value is within the second measurement range, the second moving distance is determined to be zero, and the second initial measurement value is determined to be the second measurement value.

And S280, calculating the thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction.

According to the thickness measuring method provided by the embodiment of the invention, when the first initial measurement value is not in the first measuring range, the first laser displacement sensor is moved along the first direction until the first initial measurement value fed back by the first laser displacement sensor based on the first surface of the measured object is in the first measuring range; and when the second initial measurement value is not in the second measurement range, the second laser displacement sensor is moved along the first direction until the second initial measurement value fed back by the second laser displacement sensor based on the second surface of the measured object is in the second measurement range, so that the measurement can be completed under the condition that the laser displacement sensors with different ranges are not replaced even if the fluctuation degrees of the first surface and the second surface of the measured object are larger.

On the basis of the foregoing technical solution, optionally, when the first initial measurement value exceeds the first measurement range, the controlling the first laser displacement sensor to move along the first direction until the first initial measurement value fed back by the first laser displacement sensor in the first measurement range includes: and when the first initial measurement value exceeds the first measurement range, controlling the first laser displacement sensor to move by taking the first further distance as a unit along the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range.

Wherein the first measurement range comprises a first boundary value h1 and a second boundary value h2, h1< h2, and the first further distance is the difference between the first boundary value h1 and the second boundary value h 2.

In addition, the above-mentioned manner of controlling the first laser displacement sensor to move along the first direction can make the first measurement value more easily have a larger difference with the first boundary value h1 and the second boundary value h2, i.e. the probability that the first measurement value is located at the edge of the first measurement range is relatively small. Therefore, after the current measuring point is measured, when the first laser displacement sensor and the second laser displacement sensor synchronously translate to the next measuring point for measuring, the probability that the first initial measuring value fed back by the first laser displacement sensor is in the first measuring range is larger, namely the probability that the first laser displacement sensor does not need to move along the first direction is larger. Thus, the number of times the first laser displacement sensor moves in the first direction can be reduced, thereby improving the measurement efficiency.

Optionally, when the second initial measurement value exceeds the second measurement range, the second laser displacement sensor is controlled to move along the first direction until the second initial measurement value fed back by the second laser displacement sensor in the second measurement range includes: when the second initial measurement value exceeds a second measurement range, the second laser displacement sensor is controlled to move by taking the second stepping distance as a unit along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range;

the second measuring range comprises a third boundary value h3 and a fourth boundary value h4, and the second step distance is the difference between the third boundary value h3 and the fourth boundary value h 4.

The advantage of this arrangement is that the number of times the second laser displacement sensor is moved in the first direction can be reduced, further improving the measurement efficiency.

EXAMPLE III

Fig. 4 is a flowchart of a thickness measuring method according to a third embodiment of the present invention, which is embodied on the basis of the third embodiment. Specifically, referring to fig. 4, the method specifically includes the following steps:

and S310, controlling the first laser displacement sensor or the second laser displacement sensor to move so that the light spot of the first laser beam emitted by the first laser displacement sensor coincides with the light spot of the second laser beam emitted by the second laser displacement sensor.

Illustratively, the first laser displacement sensor 21 and the second laser displacement sensor 22 are oppositely arranged, light spots projected by the first laser displacement sensor 21 and the second laser displacement sensor 22 are displayed on the same semitransparent thin flat plate, the first laser displacement sensor 21 or the second laser displacement sensor 22 is moved to enable the two light spots to coincide, and at the moment, laser emitted by the first laser displacement sensor 21 and laser emitted by the second laser displacement sensor 22 are positioned on the same straight line.

S320, placing a reference object with a known thickness in the correlation area of the first laser displacement sensor and the second laser displacement sensor, wherein the upper surface of the reference object is perpendicular to the first laser beam, and the lower surface of the reference object is perpendicular to the second laser beam; wherein the reference object comprises a gauge block of known thickness or a portion of the object under test of known thickness.

S330, determining that the plane of the upper surface of the reference object is a first reference surface, and the plane of the lower surface of the reference object is a second reference surface.

And S340, acquiring a first reference measurement value fed back by the first laser displacement sensor based on the first reference surface and a second reference measurement value fed back by the second laser displacement sensor based on the second reference surface.

Illustratively, with continued reference to FIG. 2, a gauge block 31 having a thickness of 1.5mm is positioned in the area of the first laser displacement sensor 21 and the second laser displacement sensor 22 in opposition. The first laser displacement sensor 21 and the second laser displacement sensor 22 are adjusted in the first direction 10 such that the first reference measurement value is 0 and the second reference measurement value is 0.

S350, the first laser displacement sensor and the second laser displacement sensor are synchronously controlled to move, and a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor are obtained in real time.

S360, determining a third moving distance of the first laser displacement sensor along the first direction and a third measured value fed back by the first laser displacement sensor based on the third moving distance according to whether the first initial measured value is within a first threshold range; and determining a fourth moving distance of the second laser displacement sensor along the first direction according to whether the second initial measurement value is within a second threshold value range or not, and a fourth measurement value fed back by the second laser position sensor based on the fourth moving distance.

Wherein the first measurement range comprises a first boundary value h1 and a second boundary value h2, the first threshold range comprises a fifth boundary value h5 and a sixth boundary value h6, h1< h5< h6< h 2; the second measurement range includes a third boundary value h3 and a fourth boundary value h4, the second threshold range includes a seventh boundary value h7 and an eighth boundary value h8, h3< h7< h8< h 4.

It will be appreciated that by controlling the third measurement value to be within the first threshold range and the first threshold range to be smaller than the first measurement range, the difference between the third measurement value and the first boundary value h1 and the second boundary value h2 is relatively large, i.e. the probability that the third measurement value is located at the edge of the first measurement range is small. When the first laser displacement sensor is translated to the next measuring point, the fed back first initial measurement value is relatively not easy to exceed the first measuring range, namely the first initial measurement value can correctly reflect the distance between the first laser displacement sensor and the first surface of the measured object, so that the first laser displacement sensor can be judged easily to move along the direction departing from the first reference surface or the direction close to the first reference surface through the first initial measurement value. The same applies to the second laser displacement sensor, and will not be described herein again.

Optionally, S360 includes:

s361, when the first initial measurement value exceeds a first threshold range, controlling the first laser displacement sensor to move along a first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first threshold range; determining that the moving distance of the first laser displacement sensor along the first direction is a third moving distance, and determining that a first initial measurement value fed back by the first laser displacement sensor based on the third moving distance is a third measurement value; when the first initial measurement value is within the first threshold range, determining the third movement distance as zero, and determining the first initial measurement value as a third measurement value.

Optionally, when the first initial measurement value exceeds the first threshold range, controlling the first laser displacement sensor to move in the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first threshold range includes: and when the first initial measurement value exceeds the first threshold range, controlling the first laser displacement sensor to move by taking the third stepping distance as a unit along the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first threshold range.

Wherein the first further distance is the difference between the fifth boundary value h5 and the sixth boundary value h 6.

S362, when the second initial measurement value exceeds a second threshold range, controlling the second laser displacement sensor to move along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second threshold range; determining that the moving distance of the second laser displacement sensor along the first direction is a fourth moving distance, and determining that a second initial measurement value fed back by the second laser displacement sensor based on the fourth moving distance is a fourth measurement value; when the second initial measurement value is within the second threshold range, determining the fourth movement distance as zero and determining the second initial measurement value as a fourth measurement value.

Optionally, when the second initial measurement value exceeds the second threshold range, the controlling the second laser displacement sensor to move along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second threshold range includes: and when the second initial measurement value exceeds the second threshold value range, controlling the second laser displacement sensor to move by taking the fourth stepping distance as a unit along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second threshold value range.

Wherein the fourth step distance is a difference between the seventh boundary value h7 and the eighth boundary value h 8.

Fig. 5 is a schematic diagram illustrating movement of a first laser displacement sensor and a second laser displacement sensor according to a third embodiment of the present invention. Referring to fig. 2, after the first laser displacement sensor 21 and the second laser displacement sensor 22 are synchronously controlled to move until the light spot of the laser emitted by the first laser displacement sensor 21 coincides with the measurement point d and the light spot of the laser emitted by the second laser displacement sensor 22 coincides with the measurement point d', the first initial measurement value fed back by the first laser displacement sensor 21 is out of the first threshold range, and the second initial measurement value fed back by the second laser displacement sensor 22 is out of the second threshold range. Referring to fig. 5, the first laser displacement sensor 21 is moved in units of a third stepping distance in a direction away from the first reference surface until the first initial measurement value fed back by the first laser displacement sensor 21 is within the first threshold range, at which time the third movement distance L3 is +6mm and the third measurement value L1 is 4.6 mm. The second laser displacement sensor 22 is moved in the unit of the fourth stepping distance in the direction approaching the second reference surface until the second initial measurement value fed back by the second laser displacement sensor 22 is within the second threshold range, at this time, the fourth moving distance L4 is-6.2 mm, and the fourth measurement value L2 is-3.1 mm.

And S370, calculating the thickness of the measured object according to the third measured value, the fourth measured value, the third moving distance, the fourth moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction.

Illustratively, with continued reference to fig. 5, if gauge block 31 has a thickness of 1.5mm, and distance L0 between the first and second reference surfaces is 1.5mm, then the thickness of the object to be measured is:

L＝L0+L1+L2+L3+L4＝1.5mm+4.6mm-3.1mm+6mm-6.2mm＝2.8mm。

for example, after S310 to S340, S350 to S370 are repeatedly performed, so that the thickness of the measured object can be continuously measured, and fig. 6 is a schematic diagram of a measurement result of the continuous measurement of the measured object according to a third embodiment of the present invention. Referring to fig. 6, for the third moving distance L3, when the first laser displacement sensor moves in the direction away from the first reference surface after moving in the first direction, the third moving distance L3 is negative, and when the first laser displacement sensor moves in the direction close to the first reference surface, the third moving distance L3 is positive. With respect to the fourth movement distance L4, when the second laser displacement sensor is moved in the direction away from the second reference surface after moving in the first direction, the third movement distance L3 is positive, and when the second laser displacement sensor is moved in the direction close to the second reference surface, the third movement distance L3 is negative. The skin thickness variation from the reference refers to the sum of the third measurement L1, the fourth measurement L2, the third movement distance L3, and the fourth movement distance L4.

According to the thickness measuring method provided by the embodiment of the invention, the third measured value is set in the first threshold range, and the fourth measured value is set in the second threshold range, so that the first initial measured value is easier to be in the first measuring range, and the second initial measured value is easier to be in the second measuring range, and therefore, whether the first laser displacement sensor and the second laser displacement sensor should move close to the measured object or move away from the measured object is easier to judge and control, the measuring speed is increased, and the measuring efficiency is further improved.

On the basis of the above technical solution, optionally, the first measurement range includes a first boundary value h1 and a second boundary value h2, and the first threshold range includes a ninth boundary value h9 and a tenth boundary value h10, (h1+ h2)/2 ═ h9+ h 10)/2;

the second measurement range includes a third boundary value h3 and a fourth boundary value h4, and the second threshold range includes an eleventh boundary value h11 and a twelfth boundary value h12, (h11+ h12)/2 ═ h3+ h 4)/2.

It should be noted that, if the measurement range of the laser displacement sensor is ± 3mm, the measurement accuracy of the laser displacement sensor in the vicinity of 0mm is higher than the measurement accuracy in the vicinity of +3mm and in the vicinity of-3 mm. It is therefore possible to set the middle value of the first threshold value range to coincide with the middle value of the first measurement range, and set the middle value of the second threshold value range to coincide with the middle value of the second measurement range, so that the third measurement value is in a section where the measurement accuracy is relatively high in the first measurement range, and the fourth measurement value is in a section where the measurement accuracy is relatively high in the second measurement range, thereby improving the measurement accuracy.

Example four

Fig. 7 is a structural diagram of a thickness measuring apparatus according to a fourth embodiment of the present invention. The device includes: a first and second reference measurement acquisition module 410, a synchronous movement module 420, a first and second initial measurement acquisition module 430, a first movement distance and first measurement determination module 440, a second movement distance and second measurement determination module 450, and a calculation module 460;

a first reference measurement value and second reference measurement value obtaining module 410, configured to obtain a first reference measurement value fed back by the first laser displacement sensor based on the first reference plane and a second reference measurement value fed back by the second laser displacement sensor based on the second reference plane; the first reference measurement value is in a first measurement range of the first laser displacement sensor, and the second reference measurement value is in a second measurement range of the second laser displacement sensor;

the synchronous moving module 420 is used for synchronously controlling the first laser displacement sensor and the second laser displacement sensor to move;

a first initial measurement value and second initial measurement value obtaining module 430, configured to obtain a first initial measurement value fed back by the first laser displacement sensor and a second initial measurement value fed back by the second laser displacement sensor in real time;

a first moving distance and first measurement value determining module 440, configured to determine a first moving distance of the first laser displacement sensor along the first direction and a first measurement value fed back by the first laser displacement sensor based on the first moving distance according to whether the first initial measurement value is within the first measurement range;

a second moving distance and second measurement value determining module 450, configured to determine a second moving distance of the second laser displacement sensor along the first direction and a second measurement value fed back by the second laser positioning sensor based on the second moving distance according to whether the second initial measurement value is located within the second measurement range;

a calculating module 460, configured to calculate a thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value, and the distance between the first reference surface and the second reference surface along the first direction;

On the basis of the above technical solution, optionally, the first moving distance and first measurement value determining module 440 includes: a first determination submodule and a second determination submodule;

the first determining submodule comprises a first mobile unit and a first determining unit; the first moving unit is used for the first determining unit and is used for controlling the first laser displacement sensor to move along the first direction when the first initial measurement value exceeds the first measurement range until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range; determining the moving distance of the first laser displacement sensor along the first direction as a first moving distance, and determining a first initial measurement value fed back by the first laser displacement sensor based on the first moving distance as a first measurement value;

the second determining submodule is used for determining that the first moving distance is zero and determining that the first initial measurement value is the first measurement value when the first initial measurement value is located in the first measurement range;

the second moving distance and second measurement value determining module 450 includes: a third determination unit and a fourth determination unit;

the third determining submodule comprises a third mobile unit and a third determining unit; the third moving unit is used for controlling the second laser displacement sensor to move along the first direction when the second initial measurement value exceeds the second measurement range until the second initial measurement value fed back by the second laser displacement sensor is in the second measurement range; the third determining unit is used for determining that the moving distance of the second laser displacement sensor along the first direction is a second moving distance, and determining that a second initial measurement value fed back by the second laser displacement sensor based on the second moving distance is a second measurement value;

and the fourth determination submodule is used for determining that the second moving distance is zero and determining that the second initial measurement value is the second measurement value when the second initial measurement value is located in the second measurement range.

Optionally, the first moving unit is specifically configured to, when the first initial measurement value exceeds the first measurement range, control the first laser displacement sensor to move in units of a first further distance along the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range;

wherein the first measurement range comprises a first boundary value h1 and a second boundary value h2, and the first further distance is the difference between the first boundary value h1 and the second boundary value h 2.

Optionally, the third moving unit is specifically configured to, when the second initial measurement value exceeds the second measurement range, control the second laser displacement sensor to move in units of the second stepping distance along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range;

Optionally, the method further includes: the light spot overlapping module refers to the object placing module, the first datum plane and the second datum plane determining module;

the light spot overlapping module is used for controlling the first laser displacement sensor or the second laser displacement sensor to move so as to enable the light spot of the first laser beam emitted by the first laser displacement sensor to be overlapped with the light spot of the second laser beam emitted by the second laser displacement sensor;

the reference object placing module is used for placing a reference object with known thickness in the correlation area of the first laser displacement sensor and the second laser displacement sensor, wherein the upper surface of the reference object is vertical to the first laser beam, and the lower surface of the reference object is vertical to the second laser beam; wherein the reference object comprises a gauge block with a known thickness or a part with a known thickness in the measured object;

and the first datum plane and second datum plane determining module is used for determining that the plane of the upper surface of the reference object is the first datum plane, and the plane of the lower surface of the reference object is the second datum plane.

Optionally, the first moving distance and first measurement value determining module 440 is further configured to determine a third moving distance of the first laser displacement sensor along the first direction and a third measurement value fed back by the first laser displacement sensor based on the third moving distance according to whether the first initial measurement value is within the first threshold range;

the second moving distance and second measurement value determining module 450 is further configured to determine a fourth moving distance of the second laser displacement sensor along the first direction and a fourth measurement value fed back by the second laser position sensor based on the fourth moving distance according to whether the second initial measurement value is within a second threshold range;

the calculating module 460 is further configured to calculate the thickness of the measured object according to the third measured value, the fourth measured value, the third moving distance, the fourth moving distance, the first reference measured value, the second reference measured value, and the distance between the first reference surface and the second reference surface along the first direction;

Optionally, the first measurement range includes a first boundary value h1 and a second boundary value h2, and the first threshold range includes a ninth boundary value h9 and a tenth boundary value h10, (h1+ h2)/2 ═ h9+ h 10)/2;

The thickness measuring device provided in the present embodiment is the same as the thickness measuring method provided in the first to third embodiments, and the technical details that are not described in detail in the present embodiment can be referred to in the first to third embodiments.

EXAMPLE five

Fig. 8 is a schematic structural diagram of an apparatus according to a fifth embodiment of the present invention. The apparatus comprises: processor 510, memory 52, input device 530, and output device 540; the number of the processors 510 in the device may be one or more, and one processor 510 is taken as an example in fig. 8; the device processor 510, memory 520, input device 530, and output device 540 may be connected by a bus or other means, such as by a bus connection in fig. 5.

The memory 520 serves as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as the modules corresponding to the thickness measuring apparatus in the fourth embodiment of the present invention (the first and second reference measurement value acquisition modules 410, the synchronous movement module 420, the first and second initial measurement value acquisition modules 430, the first movement distance and first measurement value determination module 440, the second movement distance and second measurement value determination module 450, and the calculation module 450). The processor 510 executes various functional applications of the apparatus and data processing by executing software programs, instructions, and modules stored in the memory 520, thereby implementing the thickness measurement method described above.

The memory 520 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 520 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 520 may further include memory located remotely from processor 510, which may be connected to devices through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 530 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the apparatus. The output device 540 may include a display device such as a display screen.

EXAMPLE six

The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the thickness measurement method as set forth in embodiments one to three. The following method can be mainly realized:

The storage medium proposed in this embodiment and the thickness measuring method proposed in embodiments one to three belong to the same inventive concept, and technical details that are not described in detail in this embodiment can be referred to in embodiments one to three, and this embodiment has the same beneficial effects as in embodiments one to three.

From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods of the embodiments of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method of thickness measurement, comprising:

acquiring a first reference measurement value fed back by a first laser displacement sensor based on a first reference surface and a second reference measurement value fed back by a second laser displacement sensor based on a second reference surface; wherein the first reference measurement value is within a first measurement range of the first laser displacement sensor and the second reference measurement value is within a second measurement range of the second laser displacement sensor;

determining a first moving distance of the first laser displacement sensor along a first direction according to whether the first initial measurement value is located in the first measurement range or not and a first measurement value fed back by the first laser displacement sensor based on the first moving distance; determining a second moving distance of the second laser displacement sensor along the first direction and a second measured value fed back by the second laser position sensor based on the second moving distance according to whether the second initial measured value is located in the second measuring range;

wherein the first reference plane and the second reference plane are parallel; the first direction is perpendicular to the first reference plane.

2. The thickness measurement method according to claim 1,

the determining a first moving distance of the first laser displacement sensor along the first direction according to whether the first initial measurement value is within the first measurement range and a first measurement value fed back by the first laser displacement sensor based on the first moving distance includes:

when the first initial measurement value exceeds the first measurement range, controlling the first laser displacement sensor to move along the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range; determining a moving distance of the first laser displacement sensor along the first direction as a first moving distance, and determining a first initial measurement value fed back by the first laser displacement sensor based on the first moving distance as a first measurement value;

when the first initial measurement value is within the first measurement range, determining that the first moving distance is zero, and determining that the first initial measurement value is a first measurement value;

the determining a second moving distance of the second laser displacement sensor along the first direction according to whether the second initial measurement value is located in the second measurement range and a second measurement value fed back by the second laser position sensor based on the second moving distance includes:

when the second initial measurement value exceeds the second measurement range, controlling the second laser displacement sensor to move along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range; determining a moving distance of the second laser displacement sensor along the first direction as a second moving distance, and determining a second initial measurement value fed back by the second laser displacement sensor based on the second moving distance as a second measurement value;

and when the second initial measurement value is within the second measurement range, determining that the second moving distance is zero, and determining that the second initial measurement value is the second measurement value.

3. The method of claim 2, wherein the controlling the first laser displacement sensor to move in the first direction when the first initial measurement value is outside the first measurement range until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range comprises:

when the first initial measurement value exceeds the first measurement range, controlling the first laser displacement sensor to move by taking a first further distance as a unit along the first direction until the first initial measurement value fed back by the first laser displacement sensor is within the first measurement range;

4. The method of claim 2, wherein the controlling the second laser displacement sensor to move in the first direction when the second initial measurement value exceeds the second measurement range until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range comprises:

when the second initial measurement value exceeds the second measurement range, controlling the second laser displacement sensor to move by taking a second stepping distance as a unit along the first direction until the second initial measurement value fed back by the second laser displacement sensor is within the second measurement range;

wherein the second measurement range includes a third boundary value h3 and a fourth boundary value h4, h3< h4, and the second step distance is a difference between the third boundary value h3 and the fourth boundary value h 4.

5. The method for measuring thickness according to claim 1, wherein before obtaining the first reference measurement value fed back by the first laser displacement sensor based on the first reference plane and the second reference measurement value fed back by the second laser displacement sensor based on the second reference plane, the method further comprises:

controlling the first laser displacement sensor or the second laser displacement sensor to move so that a light spot of a first laser beam emitted by the first laser displacement sensor coincides with a light spot of a second laser beam emitted by the second laser displacement sensor;

placing a reference object of known thickness on the correlation area of the first laser displacement sensor and the second laser displacement sensor, wherein the upper surface of the reference object is perpendicular to the first laser beam and the lower surface of the reference object is perpendicular to the second laser beam; wherein the reference object comprises a gauge block of known thickness or a portion of the object under test of known thickness;

and determining that the plane of the upper surface of the reference object is a first datum plane, and the plane of the lower surface of the reference object is a second datum plane.

6. The thickness measurement method according to claim 1,

the first moving distance of the first laser displacement sensor along the first direction is determined according to whether the first initial measurement value is located in the first measurement range, and a first measurement value fed back by the first laser displacement sensor based on the first moving distance; determining a second movement distance of the second laser displacement sensor along the first direction according to whether the second initial measurement value is within the second measurement range and a second measurement value fed back by the second laser displacement sensor based on the second movement distance comprises:

determining a third moving distance of the first laser displacement sensor along the first direction and a third measured value fed back by the first laser displacement sensor based on the third moving distance according to whether the first initial measured value is within a first threshold range; determining a fourth moving distance of the second laser displacement sensor along the first direction and a fourth measured value fed back by the second laser position sensor based on the fourth moving distance according to whether the second initial measured value is within a second threshold range;

the calculating the thickness of the measured object according to the first measured value, the second measured value, the first moving distance, the second moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction comprises:

calculating the thickness of the measured object according to the third measured value, the fourth measured value, the third moving distance, the fourth moving distance, the first reference measured value, the second reference measured value and the distance between the first reference surface and the second reference surface along the first direction;

wherein the first measurement range comprises a first boundary value h1 and a second boundary value h2, the first threshold range comprises a fifth boundary value h5 and a sixth boundary value h6, h1< h5< h6< h 2; the second measurement range comprises a third boundary value h3 and a fourth boundary value h4, the second threshold range comprises a seventh boundary value h7 and an eighth boundary value h8, h3< h7< h8< h 4.

7. The thickness measurement method according to claim 6, wherein the first measurement range includes a first boundary value h1 and a second boundary value h2, and the first threshold value range includes a ninth boundary value h9 and a tenth boundary value h10, (h1+ h2)/2 ═ h9+ h 10)/2;

8. A thickness measuring device, comprising: the device comprises a first reference measurement value and second reference measurement value acquisition module, a synchronous movement module, a first initial measurement value and second initial measurement value acquisition module, a first movement distance and first measurement value determination module, a second movement distance and second measurement value determination module and a calculation module;

the first reference measurement value and second reference measurement value acquisition module is used for acquiring a first reference measurement value fed back by the first laser displacement sensor based on the first reference surface and a second reference measurement value fed back by the second laser displacement sensor based on the second reference surface; wherein the first reference measurement value is within a first measurement range of the first laser displacement sensor and the second reference measurement value is within a second measurement range of the second laser displacement sensor;

a first moving distance and first measurement value determining module, configured to determine a first moving distance of the first laser displacement sensor in a first direction and a first measurement value fed back by the first laser displacement sensor based on the first moving distance according to whether the first initial measurement value is within the first measurement range;

a second moving distance and second measurement value determining module, configured to determine a second moving distance of the second laser displacement sensor along the first direction and a second measurement value fed back by the second laser positioning sensor based on the second moving distance according to whether the second initial measurement value is within the second measurement range;

9. An apparatus, characterized in that the apparatus comprises:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement a thickness measurement method as recited in any of claims 1-7.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a thickness measurement method according to any one of claims 1 to 7.