Digital stress indicator

Abstract

The utility model provides a kind of digital display stress meter, including base, light source module, detection module, display screen and analysis module, the light source module is located in the base, the detection module and the display screen are located on detection box body, and are set up on the base by support column, the detection module includes wave plate component, polarizer, the wave plate component is located below the polarizer, the polarizer is located on the detection box body top surface by carousel, the carousel is connected with encoder located in the detection box, the encoder synchronous detection the polarizer rotation angle transmission data to the analysis module, the analysis module electrically connected the display screen and the encoder.Integrated touch display screen, improve portability and operation efficiency, simplify equipment structure, applicable to on-site detection, also have qualitative, quantitative dual-mode detection function of quick switching.

Description

Technical Field

[0001] This utility model relates to the field of stress detection, and in particular to a digital display stress meter. Background Technology

[0002] In the fields of industrial manufacturing, materials science, and precision optics, stress testing is a core component for evaluating product quality, reliability, and performance. Internal stress in materials can lead to product deformation, cracking, or deterioration of optical performance. Accurate stress distribution detection is particularly crucial in precision components such as optical glass, crystal elements, and injection-molded parts. Existing stress testing equipment has limitations, such as the need for manual adjustment of polarization elements, cumbersome operation, and limited accuracy. Furthermore, quantitatively determining stress values ​​requires external computer data processing, resulting in complex, impractical, and costly external computers. Additionally, its limited functionality fails to meet the diverse testing needs of different scenarios. Therefore, it is necessary to design a high-precision, simple, and multifunctional portable digital stress meter. Summary of the Invention

[0003] In view of the above, this utility model provides a digital stress meter with an integrated touch screen, which improves portability and operating efficiency, simplifies the equipment structure, is suitable for on-site testing, and also has the function of quickly switching between qualitative and quantitative dual-mode testing.

[0004] The present invention specifically adopts the following technical solution: a digital stress meter, comprising a base, a light source module, a detection module, a display screen, and an analysis module. The light source module is disposed within the base, and the detection module and the display screen are disposed on a detection housing and supported on the base by a support column. The detection module includes a waveplate assembly and an analyzer. The waveplate assembly is disposed below the analyzer, and the analyzer is disposed on the top surface of the detection housing via a turntable. The turntable is connected to an encoder disposed within the detection housing. The encoder synchronously detects the rotation angle of the analyzer and transmits the data to the analysis module. The analysis module is electrically connected to the display screen and the encoder.

[0005] As a further improved technical solution, the waveplate assembly includes a full-wave plate, a quarter-wave plate, and a switching mechanism. The full-wave plate and the quarter-wave plate are disposed on the switching mechanism, and the switching mechanism alternately switches the full-wave plate or the quarter-wave plate to directly below the analyzer.

[0006] As a further improved technical solution, the encoder is connected to the turntable via a first synchronous belt, and a tensioning pulley is also provided on one side of the first synchronous belt.

[0007] As a further improved technical solution, the switching mechanism includes a lever, a second synchronous belt, a synchronous pulley, and a shift plate. There are two shift plates, which are staggered on the second synchronous belt. The full-wave plate and the quarter-wave plate are respectively disposed on the two shift plates.

[0008] As a further improved technical solution, there are two synchronous pulleys, which are located on the same inner side wall of the detection box. The second synchronous belt is sleeved on the two synchronous pulleys. One end of the lever is located on the second synchronous belt, and the other end of the lever extends out of the detection box.

[0009] As a further improved technical solution, the side wall of the detection box is provided with a slot for the lever to pass through, and a sealing strip is provided on the inner side wall of the slot.

[0010] As a further improved technical solution, the shifting plate is fixed to the second synchronous belt by a clamping plate, and the clamping plate is tightly engaged with the toothed surface of the second synchronous belt.

[0011] As a further improved technical solution, the light source module includes a glass cover plate, a light source, and a polarizer. The glass cover plate is disposed on the base, and the polarizer and the light source are disposed sequentially from top to bottom inside the base below the glass cover plate.

[0012] As a further improved technical solution, reinforcement blocks are provided at the connection points between the support column and the base and the detection box.

[0013] As a further improved technical solution, the analysis module includes a microcontroller, and the display is connected to the microcontroller through a parallel interface.

[0014] This utility model's digital stress gauge integrates a touch screen display, showing stress values ​​and related parameters (such as optical path length, photoelastic coefficient, analyzer angle, etc.) in real time. This allows operators to understand measurement results and equipment status promptly and intuitively, eliminating the need for additional computers or other complex structures or equipment. Furthermore, the display supports recording, saving, and exporting measurement data, facilitating data management, analysis, and report generation. Data traceability contributes to quality control and production process optimization. Simultaneously, an encoder is used to accurately measure the analyzer's rotation angle, combined with a microcontroller for data processing and stress calculation, significantly improving the accuracy of stress measurement. In addition, this digital stress gauge features dual detection modes: qualitative and quantitative detection. It can perform qualitative stress detection using a full-wave plate and quantitative stress measurement using a quarter-wave plate, with convenient switching to meet the testing needs of different scenarios. It is suitable for stress testing of various materials and products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this application.

[0016] Figure 2 This is a partial structural diagram of this application.

[0017] Figure 3 This is a schematic diagram of the switching mechanism structure in this application.

[0018] Figure 4 This is a schematic diagram of the light source module of this application. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0021] Reference Figures 1-3 This embodiment of a digital stress meter includes a base 1, a light source module 2, a detection module 3, a display screen 4, and an analysis module. The light source module 2 is disposed inside the base 1, and the detection module 3 and the display screen 4 are disposed on the detection housing 5 and supported on the base 1 by support columns 6. At the same time, reinforcement blocks 61 are provided at the connection points between the support columns 6 and the base 1 and the detection housing 5 to further improve stability, vibration resistance, and ensure optical path alignment accuracy. The detection module 3 includes a waveplate assembly 31 and an analyzer 32. The waveplate assembly 31 is located below the analyzer 32. The analyzer 32 is mounted on the top surface of the detection housing 5 via a turntable 33. The turntable 33 is connected to an encoder 34 located inside the detection housing 5. The encoder 34 synchronously detects the rotation angle of the analyzer 32 and transmits the data to the analysis module. The analysis module is electrically connected to the display screen 4 and the encoder via signal lines for receiving data and performing analysis and calculations. In this embodiment, the analysis module includes a microcontroller, such as an ATMEGA328P microcontroller, located inside the detection housing 5. The display screen 4 is connected to the microcontroller via a parallel interface, such as an SPI interface. The rotating turntable 33 drives the analyzer 32, and the encoder 34 synchronously acquires the rotation degree of the analyzer 32, uploads the data to the analysis module, and then transmits it to the display screen 4, thus providing a direct and accurate understanding of the rotation angle of the analyzer 32.

[0022] In this embodiment, the display screen 4 is directly integrated into the device. It is a touch screen, eliminating the need for an additional computer and making operation convenient. Users can input setting parameters through the display screen 4, such as optical path length, photoelastic coefficient, and light source wavelength. During the measurement process, the display screen 4 can display the current values ​​of parameters such as optical path length, photoelastic coefficient, optical path difference, optical path difference per unit thickness, and analyzer rotation angle in real time, as well as directly display the calculated stress value. This allows users to view and confirm the results more intuitively and accurately obtain the stress value. Furthermore, it has a built-in SD card or EEPROM storage module to automatically record and save the test results. It supports multiple export modes such as USB, Bluetooth, or wireless transmission, and the data format is compatible with Excel / Matlab, facilitating subsequent analysis and report generation.

[0023] Among them, reference Figure 2 The encoder 34 is connected to the turntable 33 via a first synchronous belt 35, and a tensioning pulley 36 is also provided on one side of the first synchronous belt 35. Specifically, a synchronous drive pulley is fixed on the rotation shaft of the turntable 33, and a synchronous driven pulley is fixed on the input shaft of the encoder 34. The first synchronous belt 35 meshes with the synchronous drive pulley on the turntable 33 and the synchronous driven pulley on the encoder 34. The tensioning pulley 36 is located on the transmission path of the slack side of the first synchronous belt 35 to tension the first synchronous belt and ensure transmission stability. Here, the slack side of the transmission path refers to the non-drive side of the first synchronous belt 35, rather than being directly located on the main transmission path between the drive pulley and the driven pulley.

[0024] Further reference Figure 3 The waveplate assembly 31 includes a full-wave plate 311, a quarter-wave plate 312, and a switching mechanism. The full-wave plate 311 and the quarter-wave plate 312 are mounted on the switching mechanism, which alternately switches the full-wave plate 311 or the quarter-wave plate 312 to directly below the analyzer 32.

[0025] The switching mechanism includes a lever 313, a second synchronous belt 314, a synchronous pulley 315, and a shift plate 316. There are two shift plates 316, which are staggered on the second synchronous belt 314. A full-wave plate 311 and a quarter-wave plate 312 are respectively disposed on the two shift plates 316. The shift plates 316 are fixed on the second synchronous belt 314 by a clamping plate 317, which tightly engages with the toothed surface of the second synchronous belt 314. There are two synchronous pulleys 315, located on the same inner sidewall of the detection housing 5. A second synchronous belt 314 is fitted onto the two synchronous pulleys 315. One end of a lever 313 is located on the second synchronous belt 314 and can be fixed together with a transposition plate 316 on its clamping plate 317, and then located on the second synchronous belt 314. The other end of the lever 313 extends beyond the detection housing 5. By moving the lever 313, the second synchronous belt 314 is driven to move, and the two transposition plates 316 move in opposite directions, so that the full-wave plate 311 and the quarter-wave plate 312 can alternately enter the center of the optical path. The sidewall of the detection housing 5 is provided with an elongated slot 318 for the lever 313 to pass through. Sealing strips are provided on the upper and lower sides of the inner sidewall of the slot 318, which does not affect the reciprocating sliding of the lever, and can also improve the sealing performance of the detection housing 5, improve the dust and pollution prevention capabilities, avoid stray light interference, and improve the signal-to-noise ratio.

[0026] When switching to the full-wave plate 311, the presence or absence of stress in the product is qualitatively detected using the sharp colorimetric method. When switching to the 1 / 4-wave plate 312, the stress in the product is quantitatively detected using the Cenamont method.

[0027] Reference Figure 4 The light source module 2 includes a glass cover plate 21, a light source 22, and a polarizer 23. The glass cover plate 21 is mounted on the base 1. The polarizer 23 and the light source 22 are sequentially arranged from top to bottom inside the base below the glass cover plate 21. The glass cover plate 21 is made of transparent, stress-free glass. The test sample is placed on the glass cover plate 21 for testing. Both the analyzer 32 and the polarizer 23 are polarizers, whose main function is to convert the incident light into linearly polarized light for emission. The polarizer, placed on the light source assembly to convert the light emitted by the light source into linearly polarized light, is called the polarizer. The analyzer, placed behind the test sample to detect the polarization state of a beam of light, is called the analyzer.

[0028] When quantitatively detecting product stress, the 1 / 4 wave plate 312 is switched to the position below the analyzer 32. The light emitted from the light source 22 passes sequentially through the polarizer 23, the product, the 1 / 4 wave plate 312, and the analyzer 32. The operator rotates and adjusts the analyzer 32 and observes the brightness change of the detection area. After rotating by θ degrees to the darkest position, the encoder records the change angle θ. Since the optical path length (d), product thickness (unit: meter), photoelastic coefficient (C), photoelastic constant of the material (unit: Pa⁻¹), and wavelength (λ), the phase difference δ = 2θ is calculated according to the Senarmont compensation method. The phase difference and stress σ = δ*λ / (2*π*C*d) are derived to σ = (λ*θ) / (π*C*d). Substituting θ, λ, C, and d into the formula, the stress σ is calculated and the result is displayed. The process of data collection and calculation is completed by the microcontroller, and the stress result is directly displayed on the display screen 4 in real time.

[0029] When qualitatively determining whether a product has stress, only visual observation is required. Switch the full-wave plate 311 below the analyzer 32. The light emitted from the light source 22 passes sequentially through the polarizer 23, the product, the full-wave plate 311, and the analyzer 32. Observe the analyzer 32. If the product has stress, the polarized light will undergo a change in polarization state after passing through the stressed product and the full-wave plate, which will then produce an interference phenomenon on the polarizer, showing colored interference fringes or color distribution. By observing the characteristics of these color changes, it is possible to determine whether the product has stress and the approximate distribution of stress.

[0030] Furthermore, the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A digital stress meter, characterized in that: The device includes a base, a light source module, a detection module, a display screen, and an analysis module. The light source module is located inside the base. The detection module and the display screen are located on the detection housing and supported on the base by support columns. The detection module includes a waveplate assembly and an analyzer. The waveplate assembly is located below the analyzer. The analyzer is located on the top surface of the detection housing via a turntable. The turntable is connected to an encoder located inside the detection housing. The encoder synchronously detects the rotation angle of the analyzer and transmits the data to the analysis module. The analysis module is electrically connected to the display screen and the encoder.

2. The digital display stress meter according to claim 1, characterized in that: The waveplate assembly includes a full-wave plate, a quarter-wave plate, and a switching mechanism. The full-wave plate and the quarter-wave plate are disposed on the switching mechanism, and the switching mechanism alternately switches the full-wave plate or the quarter-wave plate to be directly below the analyzer.

3. The digital stress meter according to claim 1, characterized in that: The encoder is connected to the turntable via a first synchronous belt, and a tensioning pulley is also provided on one side of the first synchronous belt.

4. The digital display stress meter according to claim 2, characterized in that: The switching mechanism includes a lever, a second synchronous belt, a synchronous pulley, and a shift plate. There are two shift plates, which are staggered on the second synchronous belt. The full-wave plate and the quarter-wave plate are respectively disposed on the two shift plates.

5. The digital display stress meter according to claim 4, characterized in that: There are two synchronous pulleys, which are located on the same inner side wall of the detection box. The second synchronous belt is sleeved on the two synchronous pulleys. One end of the lever is located on the second synchronous belt, and the other end of the lever extends out of the detection box.

6. The digital display stress meter according to claim 4, characterized in that: The side wall of the detection box is provided with a slot for the handle to pass through, and a sealing strip is provided on the inner side wall of the slot.

7. The digital display stress meter according to claim 4, characterized in that: The shifting plate is fixed to the second synchronous belt by a clamping plate, and the clamping plate is tightly engaged with the toothed surface of the second synchronous belt.

8. The digital display stress meter according to claim 1, characterized in that: The light source module includes a photomask, a light source disposed within the photomask, and a polarizer. The side of the photomask closest to the product under test is transparent glass, and the polarizer is disposed within the photomask close to the transparent glass.

9. The digital display stress meter according to claim 1, characterized in that: The support column is reinforced with a reinforcing block at the connection point with the base and the detection box.

10. The digital display stress meter according to claim 1, characterized in that: The analysis module includes a microcontroller, and the display is connected to the microcontroller via a parallel interface.

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