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CN-121994150-A - Laser calliper with bidirectional display and operation and method

CN121994150ACN 121994150 ACN121994150 ACN 121994150ACN-121994150-A

Abstract

The invention discloses a laser calliper and a method for bidirectional display and operation, which relate to the technical field of laser callipers and comprise a coefficient calibration module, a coefficient calibration module and a control module, wherein the coefficient calibration module is used for generating a first leakage strip and a second leakage strip, and determining an equivalent absorption coefficient based on the first leakage strip and the second leakage strip; the device comprises a reference recording module, a leakage field calculating module, a diameter measuring correcting module and a diameter measuring correcting module, wherein the reference recording module is used for recording a reference standard and a reference distance of a reference pixel, the leakage field calculating module is used for calculating leakage field estimation based on a wall propagation distance field, an equivalent absorption coefficient and the reference standard and the reference distance, the diameter measuring correcting module is used for correcting a diameter measuring section based on the leakage field estimation and an original diameter measuring section, and the target diameter of a measured object is determined based on the corrected diameter measuring section. The invention improves the stability and repeatability of measurement.

Inventors

  • LUO XIYANG
  • ZHAO XIAOJUN

Assignees

  • 广州海狮软件科技有限公司

Dates

Publication Date
20260508
Application Date
20260119

Claims (9)

  1. 1. A laser calliper for bi-directional display and operation, comprising: The coefficient calibration module is used for generating a first leakage strip and a second leakage strip, and determining an equivalent absorption coefficient based on the first leakage strip and the second leakage strip; the reference recording module is used for recording the reference standard and the reference distance of the reference pixel; A leakage field calculation module for calculating a leakage field estimate based on the wall-propagating distance field, the equivalent absorption coefficient, the reference datum and the reference distance; The diameter measurement correction module is used for estimating a leakage field and forming a corrected diameter measurement section based on the original diameter measurement section, and determining the target diameter of the measured object based on the corrected diameter measurement section; And the bidirectional interaction module is used for carrying out bidirectional interface presentation and interaction calling on the target diameter, and the front and the back of the display mechanism are both provided with operation panels.
  2. 2. The bi-directional display and operation laser calliper of claim 1, wherein generating the first leakage strip and the second leakage strip comprises: Closing the main diameter measuring emitter, and sequentially applying auxiliary grazing light irradiation to the wall surface of the cavity to be measured at a first grazing angle and a second grazing angle; And acquiring the intensity distribution of the leakage strips respectively corresponding to the first glancing angle and the second glancing angle in the edge area of the measuring window by the receiving linear array to obtain a first leakage strip and a second leakage strip.
  3. 3. The bi-directional display and operation laser calliper of claim 1, wherein determining the equivalent absorption coefficient based on the first leakage strip and the second leakage strip comprises: Calculating a critical angle according to the refractive index of air and the refractive index of the water film; If the first glancing incidence angle and the second glancing incidence angle are both larger than the critical angle, confirming that the light guiding condition along the wall is satisfied, otherwise, judging that the light guiding condition along the wall is not satisfied; Under the condition that the light guiding condition along the wall is met, carrying out differential operation on the first leakage strip and the second leakage strip to obtain a leakage signature; Calculating the distance of the leakage light from the light inlet point to each pixel position along the wall based on the geometric calibration relation between the measurement window and the wall surface, and generating a distance field along the wall; And carrying out logarithmic linear fitting on the leakage signature and the distance field propagated along the wall to obtain an equivalent absorption coefficient.
  4. 4. A bi-directional display and operation laser calliper according to claim 1, wherein recording the reference datum and reference distance of the reference picture element comprises: Starting a main diameter measuring transmitter, and collecting an original diameter measuring section of a measured object in a linear array scanning mode, wherein the original diameter measuring section is the intensity of infrared receiving signals at pixel coordinates; selecting a reference pixel nearest to the leakage port from a pixel set corresponding to the original diameter measurement section according to the geometric calibration relation between the measurement window and the wall surface; Recording the receiving intensity of the reference picture element in the main diameter measuring period as a reference standard, and synchronously recording the corresponding reference distance of the reference picture element.
  5. 5. A bi-directional display and operation laser calliper according to claim 1, wherein calculating the leakage field estimate based on the wall propagation distance field, the equivalent absorption coefficient, the reference datum and the reference distance comprises: Calculating the distance difference between the distance field propagating along the wall and the reference distance to obtain the distance difference along the wall Multiplying the equivalent absorption coefficient and the wall-along distance difference to obtain a linear combination term of the index term; Performing exponential operation on the linear combination term of the exponential term to obtain an exponential decay factor; And multiplying the reference standard and the exponential decay factor to obtain leakage field estimation.
  6. 6. A bi-directional display and operation laser calliper according to claim 1, wherein the corrected calliper profile based on the leakage field estimate and the original calliper profile comprises: performing pixel-by-pixel unfolding processing on the leakage field estimation to obtain pixel-by-pixel leakage intensity; And performing pixel-by-pixel cancellation operation on the original diameter measurement section and the pixel-by-pixel leakage intensity to obtain a corrected diameter measurement section.
  7. 7. The bi-directional display and operation laser calliper of claim 1, wherein determining the target diameter of the object under test based on the corrected calliper profile comprises: traversing the corrected diameter measurement section to obtain a maximum value, and obtaining a bright field platform value; scaling the bright field platform value to obtain a half-height value; Respectively carrying out linear interpolation search on a left descending edge and a right ascending edge of the correction diameter measurement section based on the half height value to obtain a left edge pixel coordinate and a right edge pixel coordinate; Calculating the difference between the coordinates of the right edge pixel and the coordinates of the left edge pixel to obtain a pixel spacing difference; And carrying out proportional conversion on the pixel spacing difference value and the pixel scale coefficient to obtain the target diameter of the measured object.
  8. 8. The bi-directional display and operation laser calliper of claim 4, wherein selecting the reference element closest to the leak according to the geometric calibration relationship between the measurement window and the wall surface comprises: And determining the wall-along propagation distance of each pixel relative to the leakage opening according to the geometric calibration relation between the pre-established measurement window and the wall surface, and selecting the pixel with the smallest wall-along propagation distance from the wall-along propagation distance as the reference pixel closest to the leakage opening.
  9. 9. A method of diameter measurement for bi-directional display and operation, the method comprising: S1, generating a first leakage strip and a second leakage strip, and determining an equivalent absorption coefficient based on the first leakage strip and the second leakage strip; S2, recording a reference standard and a reference distance of a reference pixel; S3, calculating leakage field estimation based on the propagation distance field along the wall, the equivalent absorption coefficient, the reference base and the reference distance; s4, forming a correction diameter measurement section based on the leakage field estimation and the original diameter measurement section, and determining the target diameter of the measured object based on the correction diameter measurement section; s5, performing bidirectional interface presentation and interactive calling on the target diameter.

Description

Laser calliper with bidirectional display and operation and method Technical Field The invention relates to the technical field of laser callipers, in particular to a laser calliper with bidirectional display and operation and a method thereof. Background In the detection scene of long and narrow cavity structures such as wind power towers, shafts, pipelines and the like, the geometric dimension of the inner wall is required to be accurately measured so as to evaluate the machining precision and the service state of the component. The laser calliper is widely used for measuring the inner diameter of the cavity by virtue of its good environmental adaptability and high response speed as a non-contact detection device. However, in the tower or shaft environment, the inner wall often generates a continuous thin water film due to temperature and humidity difference, and when the infrared beam irradiates the wall surface in a glancing manner, the water film forms a light guiding phenomenon along the wall, so that part of energy leaks back to the measuring system through the window edge, thereby generating false optical response. In addition, multisource illumination and alternate personnel operation in a narrow space enable the incident direction of a measuring window and the wall reflection condition to change dynamically, so that the diameter measurement result is subjected to randomness deviation, and the measuring stability and repeatability are seriously affected. In the prior art, the traditional laser diameter measuring method generally assumes that the optical paths near the measuring window are all ideal direct or diffuse reflection models, omits the interference of light guiding along the wall and leakage caused by a thin water film on the wall, and is independent of a one-way display or one-way data output mode, so that the measuring error cannot be verified or corrected in real time. In this way, when the virtual edge formed by the light guiding along the wall and window leakage induced by the thin water film on the wall is faced, the virtual signal is easily misjudged as a real boundary, so that a systematic error with larger or smaller diameter calculation is caused. Especially under the two-way operation demand scene, the data interaction and the error self-correction between the measuring end and the display end are difficult to realize by the existing laser calliper, the real-time performance and the reliability of on-site measurement are limited, only single-sided display and operation are carried out, and the real-time measurement data are inconvenient to watch by production staff. Disclosure of Invention The invention aims to solve the defects that the prior laser calliper is difficult to realize data interaction and error self-correction between a measuring end and a display end and limits the real-time performance and reliability of field measurement, and provides a bidirectional display and operation laser calliper and a method thereof. In order to solve the problems existing in the prior art, the invention adopts the following technical scheme: A laser calliper for bi-directional display and operation, comprising: preferably, generating the first leakage strip and the second leakage strip comprises: Closing the main diameter measuring emitter, and sequentially applying auxiliary grazing light irradiation to the wall surface of the cavity to be measured at a first grazing angle and a second grazing angle; And acquiring the intensity distribution of the leakage strips respectively corresponding to the first glancing angle and the second glancing angle in the edge area of the measuring window by the receiving linear array to obtain a first leakage strip and a second leakage strip. Preferably, determining the equivalent absorption coefficient based on the first leakage strip and the second leakage strip comprises: Calculating a critical angle according to the refractive index of air and the refractive index of the water film; If the first glancing incidence angle and the second glancing incidence angle are both larger than the critical angle, confirming that the light guiding condition along the wall is satisfied, otherwise, judging that the light guiding condition along the wall is not satisfied; Under the condition that the light guiding condition along the wall is met, carrying out differential operation on the first leakage strip and the second leakage strip to obtain a leakage signature; Calculating the distance of the leakage light from the light inlet point to each pixel position along the wall based on the geometric calibration relation between the measurement window and the wall surface, and generating a distance field along the wall; And carrying out logarithmic linear fitting on the leakage signature and the distance field propagated along the wall to obtain an equivalent absorption coefficient. Preferably, recording the reference datum and the reference distance of the reference pi