Digital laser level and its eventized measurement recording method based on specification threshold

Abstract

The application discloses a digital laser level and an event-based measurement recording method based on a specification threshold. The ruler body is hollow inside and is provided with a light path channel. A light source is arranged at the bottom of the ruler body for projecting light to the gap between the bottom of the ruler and the surface to be measured, and a light and shade image with light and shade contrast is formed at the fitting surface with flatness deviation. The light path assembly in the light path channel conducts the light and shade image to the camera module. The processing and storage module extracts the flatness feature of the collected light and shade image, converts it into quantitative data and stores it. The application converts the invisible interface state after the ruler body is attached into quantifiable and traceable quality evidence, fundamentally overcomes the limitation that the existing level can only read the angle or the levelness but cannot quantify the interface state of the attachment, improves the flatness detection precision, and provides direct basis for the after-check of the single measurement result by cooperating with the event-based measurement recording method based on the specification threshold.

Description

Technical Field

[0001] This invention relates to the field of measuring tool technology, specifically to a digital laser level and its event-based measurement recording method based on standardized thresholds. Background Technology

[0002] A spirit level is a common tool used in construction and decoration to check the levelness, verticality, and flatness of surfaces. A digital laser spirit level adds electronic angle measurement and laser line projection functions to the traditional spirit level, allowing for a clear display of the level's tilt angle and projection of horizontal or vertical reference lines, facilitating leveling and vertical correction.

[0003] For example, Chinese utility model patent CN2694227Y discloses a laser angle gauge, which connects a laser gun that can rotate 0° to 90° around the bisector to a right-angled triangle with a base. The laser beam is aimed at the point or line being measured, and a pointer on the pointer base points to the protractor graduations to read the angle between the measured object and the horizontal or vertical direction. This can be used for interior decoration positioning, stair slope measurement, etc. While existing level and angle gauges can provide quantitative readings of angles or levels, they cannot directly provide quantitative results for the flatness of the interface between the bottom surface of the gauge and the measured surface (i.e., local unevenness and gaps on the measured surface).

[0004] The reason for this is that in actual operations, operators usually rely on visual inspection by passing light through a straightedge or inserting a feeler gauge into the gap to make judgments. After the ruler is in place, its bottom interface is obscured by the ruler itself, making it difficult to observe directly. Such judgments are highly dependent on the operator's experience and eyesight, are highly subjective, have poor repeatability, and the test results cannot be quantified, recorded, or traced, making it difficult to provide objective evidence during quality acceptance or dispute resolution.

[0005] Furthermore, most existing measuring tools only display measurement readings in real time and do not have a built-in mechanism to automatically judge the readings based on the threshold of the construction acceptance specifications. They also do not classify and store regular data and out-of-limit data in a hierarchical manner, nor do they solidify and preserve measurement records. The instrument readings are lost as soon as they are switched, and cannot be verified afterward. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing level rulers, which cannot quantify the state of the ruler body fitting interface and cannot automatically determine and solidify evidence based on standardized thresholds. It provides a digital laser level ruler and its event-based measurement and recording method based on standardized thresholds, which transforms the invisible interface state after the ruler body fits into quantifiable and traceable quality evidence, and realizes real-time comparison of measurement readings with standardized thresholds, hierarchical classification storage, and indivisible solidified archiving.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A digital laser level includes a ruler body with a hollow interior forming an optical path channel. The optical path channel communicates with a gap between the bottom of the ruler body and the surface to be measured. A light source is provided at the bottom of the ruler body to project light into the gap, thereby forming a light and shadow image with contrast between light and dark at the mating surface where there is a flatness deviation. An optical path assembly is provided within the optical path channel to transmit the light and shadow image to a camera module. The camera module is located at the light-emitting end of the optical path assembly and is used to acquire the transmitted light and shadow image. The camera module is electrically connected to a processing and storage module, which is used to extract flatness features from the acquired light and shadow image, convert it into quantified data, and store it.

[0008] Furthermore, the light source is at least one light source strip arranged along the length of the ruler body; the optical path channel is connected to the gap through light-transmitting holes uniformly arranged at the bottom of the ruler body, and each light-transmitting hole corresponds to an independent detection area and forms discrete light spots that do not interfere with each other.

[0009] Furthermore, the optical path assembly is a switchable optical path assembly, including a reflective element and a switching mechanism; when the reflective element is in the normal position, it does not intervene in the optical path, and the camera of the camera module captures the environment in front; when in the detection position, the switching mechanism switches the reflective element into the optical path, so that the observation direction is turned to the bonding interface between the bottom surface of the ruler and the surface to be measured, thereby enabling the same camera to have the dual functions of capturing the construction environment and acquiring the light and shadow image of the bonding interface.

[0010] Furthermore, the front end of the ruler body is provided with a mounting groove, and the camera module is embedded in the mounting groove; the switching mechanism includes a rotating frame rotatably connected in the mounting groove, and the rotating frame is hinged with a reflecting prism as a reflecting element; the rotating frame, the reflecting prism and the camera module are all equipped with independent electric fine-tuning shafts to adjust the optical path angle in stages, suppress glare and correct optical axis assembly deviations.

[0011] Furthermore, the upper end of the ruler is provided with a laser projection module for emitting horizontal and / or vertical beams; the middle part of the ruler is equipped with an attitude sensor, and one end of the ruler is hinged with a right-angle measuring plate with a built-in tilt sensor, so as to realize laser leveling, attitude reference detection and corner verticality detection respectively.

[0012] This invention also provides an event-based measurement recording method based on standardized thresholds for application to the aforementioned digital laser level, comprising the following steps: presetting a standard threshold library; initiating measurement and automatically comparing the measurement reading with the corresponding threshold; storing the comparison results in a hierarchical and categorized manner, wherein regular data is continuously and automatically saved, and out-of-limit data is marked with anomalies and the image, original data, and measurement extreme values ​​are stored synchronously; calculating the flatness deviation of the mating surface based on imaging deformation and writing it as an additional quality parameter into the measurement event; binding the measurement reading, timestamp, and identifier into an inseparable complete record and writing it into local storage.

[0013] Furthermore, the above-mentioned hierarchical classification and storage steps also include a user-initiated marking option. When this option is triggered, the recording window is automatically extended, and the switchable optical path component is triggered to switch to the observation position of the bonding interface to acquire the bonding interface image.

[0014] The beneficial effects of this invention are as follows: Firstly, by illuminating the gap between the bottom of the ruler and the surface to be measured through the bottom light source, a light and shadow image with contrast between light and dark is formed at the uneven area. This image is then transmitted to the camera module for acquisition and quantification through the optical path channel and optical path components inside the ruler. This transforms the invisible interface state after the ruler is attached into quantifiable and traceable quality evidence, overcoming the subjective problem of existing level rulers that rely on "insertion of feeler gauge and visual inspection through light transmission". This provides an objective basis for the identification of local unevenness defects on the surface to be measured and improves the accuracy of flatness detection.

[0015] Secondly, the same camera has dual capabilities thanks to the switchable optical path component. Under normal conditions, it can record the construction site conditions for subsequent traceability. When switched, it can collect light and shadow images of the interface to provide raw data for flatness calculation. In conjunction with the light-transmitting holes of the array, it generates discrete light spots that do not interfere with each other, avoiding light crosstalk and data averaging, and further improving detection accuracy.

[0016] Third, through an event-based measurement recording method based on standardized thresholds, the measurement readings are automatically compared with the preset construction acceptance standard thresholds at the moment of acquisition. Regular data and out-of-limit data are stored in hierarchical categories. Out-of-limit data are marked with anomalies and images, raw data and measurement extreme values ​​are stored simultaneously. The measurement records are bound by timestamps and identifiers and are permanently archived. This eliminates the historical limitation of "readings being lost" from the tool end and provides direct evidence for the post-event verification of individual measurement results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the digital display laser level of the present invention; Figure 2 This is a partial structural diagram of the front end of the digital display laser level of the present invention; Figure 3 This is a schematic diagram of the bottom structure of the ruler body of the present invention; Figure 4 This is a flowchart illustrating the event-based measurement and recording method based on standardized thresholds according to the present invention. Explanation of markings in the diagram: 10-Scale body; 11-Light transmission hole; 12-Mounting slot; 13-Storage slot; 20-Light source strip; 30-Switchable optical path assembly; 31-Switching mechanism; 311-Rotating frame; 312-Reflecting prism; 40-Camera module; 41-Camera; 50-Digital display module; 51-Button; 60-Laser projection module; 70-Right-angle measuring plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The following embodiments are illustrated by taking two light source strips symmetrically arranged at the bottom of the ruler and a hinged reflective prism as an example, but the scope of protection of the present invention is not limited thereto.

[0019] This embodiment provides a digital display laser level, which further improves the existing structure for detecting flatness to enhance detection accuracy. By adding a light source, an optical path component, and a camera module on its optical path, the light source shines light into the gap between the bottom of the level and the surface to be measured, generating images of varying brightness on uneven surfaces. The optical path component then transmits these images to the camera module, thereby transforming the invisible interface state after the level is attached into quantifiable and traceable quality evidence.

[0020] refer to Figure 1 The level includes a ruler body 10, and at least one light source strip 20 is embedded in the bottom of the ruler body 10 (e.g., Figure 3 As shown in the figure, the light source strip 20 is arranged along the length of the ruler 10; the ruler 10 is hollow inside and forms a light path channel (not shown in the figure), which is connected to the gap between the bottom surface of the ruler 10 and the surface to be measured through the light-transmitting holes 11 evenly distributed at the bottom; a switchable light path component 30 is provided in the light path channel, which is used to reflect and transmit the light and shadow image after the light source strip 20 projects light onto the mating surface with flatness deviation and generates a light and shadow image with light and dark contrast; a camera module 40 is installed at the light-emitting end of the switchable light path component 30, which is used to collect the transmitted light and shadow image; the camera module 40 is electrically connected to a processing and storage module and a digital display module 50, the former is used to receive and process the collected image, extract flatness features and convert them into quantitative data, and complete data storage, and the latter is used to intuitively display the processing results, so that the operator can directly read the detection information.

[0021] refer to Figure 1 and Figure 2The switchable optical path assembly 30 includes a reflective element and a switching mechanism 31. In the normal position (i.e., when flatness detection is not performed), the reflective element does not intervene in the optical path, and the camera 41 in the camera module 40 captures the construction environment in front. When flatness detection is required, the switching mechanism 31 flips the reflective element to enter the optical path, turning the observation direction to the interface between the bottom surface of the ruler 10 and the surface to be measured. The reflective element (not shown in the figure) can be a prism and / or a mirror to achieve optical path transmission.

[0022] The above solution has the following effects: First, by visually presenting the gap changes between the bottom surface of the ruler 10 and the surface to be measured through light and shadow images with contrasting brightness, it accurately identifies local concave and convex defects on the surface to be measured, transforming the invisible interface state after the ruler is attached into quantifiable and traceable quality evidence, greatly improving the flatness detection accuracy. Second, the same camera 41 has dual capabilities: it can record the construction environment for subsequent traceability of the on-site working conditions, and it can switch the shooting interface and collect light and shadow images between the attached interfaces through the switchable optical path component 30, providing raw data for accurate flatness calculation. Third, in conjunction with the array of light-transmitting holes 11, it generates independent and non-interfering discrete light spots, avoiding light crosstalk and data averaging. Each hole corresponds to an independent detection area, which can accurately capture local gap changes, further improving the flatness detection accuracy.

[0023] refer to Figure 2 The ruler body 10 has a mounting groove 12 at its front end, and the camera module 40 is embedded in the mounting groove 12. The switching mechanism 31 includes a rotating frame 311 rotatably connected to the mounting groove 12, and a reflecting prism 312 is hinged to the rotating frame 311. Under normal conditions, the reflecting prism 312 is embedded in the mounting groove 12. When it is necessary to detect flatness, the rotating frame 311 is rotated to move the reflecting prism 312 to the front of the camera 41, so as to transmit the light and shadow image transmitted by the reflecting element to the camera module 40.

[0024] The hinged design of the reflecting prism 312 allows for adjustment of the final light emission angle by driving its rotation, thereby improving the contrast between light and dark areas for recognition by the camera 41. To further optimize the lighting effects and ensure the accuracy of the light and shadow image acquisition, the rotating frame 311, the reflecting prism 312, and the camera module 40 are all equipped with independent electrically adjustable micro-shafts (not shown in the figure) to adjust the light path angle in stages, suppress mirror glare, improve image contrast between light and dark areas, compensate for optical axis misalignment caused by assembly, stabilize the imaging position of the light spot within the field of view, and improve the camera's recognition efficiency of the concave and convex contours on the mating surface.

[0025] To further improve the functionality of this level and diversify its detection capabilities, the level also integrates traditional basic functions such as verticality detection, slope detection, corner verticality detection, and laser calibration, as detailed below. A posture sensor (not shown in the figure) is built into the center of the level body 10. This sensor is positioned away from the optical path and electrically connected to the processing and storage module and the digital display module 50. It is used to detect the dual-axis tilt angle of the level body 10 along its length and width directions in real time and outputs a digital signal of the current horizontal posture of the level body 10, providing a posture reference for flatness image detection.

[0026] refer to Figure 1 and Figure 2 The upper end of the ruler 10 is also provided with a laser projection module 60, which can emit horizontal beams and / or vertical beams; in this embodiment, it is preferred to emit mutually perpendicular cross-shaped beams, which on the one hand meets the basic horizontal leveling and vertical correction operations, and on the other hand, in conjunction with the aforementioned scheme of acquiring light and shadow images to improve the flatness detection accuracy, provides an ideal baseline for intuitive comparison of the height and undulation of the mating surface.

[0027] refer to Figure 1 The ruler 10 has a right-angle measuring plate 70 rotatably hinged to the middle of one end, with its rotation plane parallel to the front face of the ruler. The ruler 10 also has a storage slot 13, which avoids the optical path and is used to store the right-angle measuring plate 70. Furthermore, the right-angle measuring plate 70 has a built-in tilt sensor (not shown in the figure) at its end away from the hinge side. The tilt sensor is electrically connected to the processing and storage module and the digital display module 50. When measuring the verticality of a wall corner, the ruler 10 and the right-angle measuring plate 70 are respectively attached to the two adjacent facades of the wall corner. The tilt data of the two facades are collected by the attitude sensor and the tilt sensor, respectively. The processing and storage module then calculates the actual included angle between the two facades, thus converting the original rough visual observation into a more accurate digital angle detection.

[0028] Preferably, refer to Figure 2 The digital display module 50 is equipped with buttons 51 to facilitate active input or adjustment of information.

[0029] refer to Figure 3In this embodiment, the light source strip 20 and the light-transmitting holes 11 are configured as follows to ensure effective imaging and clear acquisition of light and shadow images. The light source strip 20 occupies 75%-85% of the effective reference length of the ruler body 10 (the length of the storage slot 13 and the length of the digital display module 50 are not included in the effective reference length), and the distance between its two ends and the end of the ruler body 10 is not less than 20mm; the length range formed by all the light-transmitting holes 11 is slightly larger than the length range of the light source strip 20. When the light source strip 20 is a single strip, it is located at the bottom center, and its width accounts for 30%-35% of the total width of the ruler body 10; in this embodiment, it is preferable to set two light source strips 20, symmetrically arranged close to the outer side, and the width of each strip accounts for 20%-25% of the total width of the ruler body 10.

[0030] refer to Figure 4 This embodiment also provides an event-based measurement recording method for a digital laser level based on a standardized threshold, comprising the following steps: S1: Preset standard threshold library: The processing and storage module pre-stores the standard threshold library of structured construction to provide benchmark reference data for the judgment of subsequent test results.

[0031] S2: Start measurement and compare threshold: Trigger the measurement action, at which time the processing and storage module automatically compares the reading with the corresponding threshold.

[0032] S3: Hierarchical and Classified Storage: Based on the comparison results of step S2, the recording strategy is dynamically determined, including the automatic storage of regular data and out-of-limit data. Regular data is continuously and automatically saved, and out-of-limit data is marked with anomalies. Images, raw data and measurement extreme values ​​are also stored simultaneously.

[0033] S4: Image processing: Calculate the flatness deviation of the mating surface (maximum gap width, gap distribution characteristics along the ruler direction) based on the imaging deformation, and write it into the measurement event as an additional quality parameter.

[0034] S5: Data solidification and archiving: Binds measurement readings, timestamps, and identifiers into an inseparable, complete record and writes it to local storage.

[0035] Furthermore, step S3 also includes a user-initiated marking option. When this option is triggered, the recording window is automatically extended, and the switchable optical path component 30 is triggered to switch to the observation position of the bonding interface to acquire the image of the bonding interface. This process includes the following steps: Forming a light and shadow image: Light source strip 20 is lit, and the light illuminates the gap between the bottom of the ruler and the surface to be measured, generating a light and shadow image with contrasting light and dark.

[0036] Transmitting light and shadow images: Rotate the rotating frame 311 to open the reflective prism 312, obtain the light and shadow images transmitted by the reflective element, and open the reflective prism 312 to be located directly in front of the camera 41, transmitting the light and shadow images to the camera module 40.

[0037] Adjusting the optimal light and shadow image: Drive the rotating frame 311 to rotate and complete a one-way stroke, while opening the reflective prism 312 to capture images throughout the entire process, automatically search for the best point of brightness and contrast and accurately return to its original position to complete the coarse adjustment of the optical path and lock the optimal contrast position; after locking the rotating frame, drive the reflective prism 312 and the camera module 40 to independently rotate slightly in their original positions to optimize reflected light, eliminate glare and correct optical axis assembly deviations.

[0038] Receiving light and shadow images: The processing and storage module receives the light and shadow images captured by the camera module 40 and performs image processing and archiving in the above steps S4 and S5.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A digital laser level, comprising a level body (10), characterized in that: The ruler (10) is hollow inside and forms an optical path channel, which is connected to the gap between the bottom of the ruler (10) and the surface to be measured; a light source (20) is provided at the bottom of the ruler (10), which is used to project light into the gap to form a light and shadow image with contrast between light and dark at the mating surface where there is a flatness deviation; an optical path component (30) is provided in the optical path channel, which is used to transmit the light and shadow image to the camera module (40); the camera module (40) is located at the light-emitting end of the optical path component (30) and is used to collect the transmitted light and shadow image; the camera module (40) is electrically connected to a processing and storage module, which is used to extract flatness features from the collected light and shadow image, convert it into quantitative data, and store it.

2. The digital laser level according to claim 1, characterized in that: The light source is at least one light source strip (20) arranged along the length direction of the ruler (10).

3. The digital laser level according to claim 2, characterized in that: When there is one light source strip (20), it is located at the center of the bottom of the ruler body (10); or, the light source strip (20) is two symmetrically arranged strips.

4. The digital laser level according to claim 1, characterized in that: The optical path channel is connected to the gap through light-transmitting holes (11) evenly distributed at the bottom of the ruler (10). Each light-transmitting hole (11) corresponds to an independent detection area and forms discrete light spots that do not interfere with each other. The length range formed by all the light-transmitting holes (11) is greater than the length range of the light source (20).

5. The digital laser level according to claim 1, characterized in that: The optical path assembly (30) is a switchable optical path assembly, including a reflective element and a switching mechanism (31); when the reflective element is in the normal position, it does not intervene in the optical path, and at this time the camera (41) of the camera module (40) captures the environment in front; when in the detection position, the switching mechanism (31) cuts the reflective element into the optical path, so that the observation direction is turned to the bonding interface between the bottom surface of the ruler (10) and the surface to be measured.

6. The digital laser level according to claim 5, characterized in that: The ruler (10) has a mounting groove (12) at its front end, and the camera module (40) is embedded in the mounting groove (12). The switching mechanism (31) includes a rotating frame (311) rotatably connected in the mounting groove (12), and the rotating frame (311) is hinged to a reflecting prism (312) as a reflecting element. The rotating frame (311), the reflecting prism (312) and the camera module (40) are all equipped with independent electric fine-tuning shafts.

7. The digital laser level according to claim 1, characterized in that: The camera module (40) is also electrically connected to a digital display module (50), which is used to display the processing results and is equipped with buttons (51); the upper end of the ruler (10) is provided with a laser projection module (60), which is used to emit horizontal beams and / or vertical beams.

8. The digital laser level according to claim 1, characterized in that: The ruler (10) has a built-in attitude sensor in the middle that avoids the optical path channel. The attitude sensor is electrically connected to the processing and storage module and is used to detect the dual-axis tilt angle of the ruler (10) along the length and width directions and to provide an attitude reference for image detection.

9. The digital laser level according to claim 1, characterized in that: One end of the ruler (10) is rotatably hinged to a right-angle measuring plate (70). The end of the right-angle measuring plate (70) away from the hinge side is equipped with an inclination sensor. The inclination sensor is electrically connected to the processing and storage module. The ruler (10) is also provided with a storage slot (13) that avoids the optical path channel for storing the right-angle measuring plate (70).

10. An event-based measurement recording method based on a standardized threshold, applied to the digital laser level as described in claim 1, characterized in that, Includes the following steps: S1: Preset standard threshold library, the processing and storage module pre-stores the standard threshold library of structured construction, and provides benchmark reference data for the judgment of detection results; S2: Start the measurement and compare the threshold, trigger the measurement action, and the processing and storage module automatically compares the measurement reading with the corresponding threshold. S3: Hierarchical and classified storage. Based on the comparison results of step S2, the recording strategy is dynamically determined, including the automatic storage of regular data and out-of-limit data. Regular data is continuously and automatically saved, while out-of-limit data is marked with anomalies and the images, raw data and measurement extreme values ​​are stored synchronously. S4: Image processing, calculate the flatness deviation of the bonding surface based on the imaging deformation, the flatness deviation includes the maximum gap width and the distribution characteristics of the gap along the ruler direction, and write it as an additional quality parameter into the measurement event. S5: Data solidification and archiving binds measurement readings, timestamps, and identifiers into an indivisible, complete record and writes it to local storage.

11. The method according to claim 10, characterized in that: Step S3 also includes a user-initiated marking option. When this option is triggered, the recording window is automatically extended, and the optical path component (30) is triggered to switch to the observation position of the bonding interface to acquire the bonding interface image. The process of acquiring the image of the bonding interface includes the following steps: A light and shadow image is formed by lighting the light source (20). The light illuminates the gap between the bottom of the ruler and the surface to be measured, generating a light and shadow image with contrasting light and dark. Transmit the light and shadow image, rotate the rotating frame (311) to open the reflecting prism (312), so that the reflecting prism (312) is located directly in front of the camera (41), and transmit the light and shadow image to the camera module (40). Adjust the optimal light and shadow image, drive the rotating frame (311) to rotate and complete the one-way stroke, and capture the image throughout the process while opening the reflective prism (312). Automatically search for the best point of contrast and accurately return to the original position to complete the coarse adjustment of the light path. After locking the optimal contrast position, drive the reflective prism (312) and the camera module (40) to rotate slightly in their own positions to optimize the reflected light, eliminate glare and correct the optical axis assembly deviation. The light and shadow image is received by the processing and storage module, which receives the light and shadow image captured by the camera module (40) and performs image processing and archiving in steps S4 and S5.

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