An optical path calibration tool and method for testing annular spray fields.

Abstract

This application belongs to the field of annular spray field testing technology, and specifically relates to an optical path calibration tool and method for annular spray field testing. The tool includes: a rod-shaped bracket with multiple mounting holes; a mounting base including a front mounting base, a middle mounting base, and a rear mounting base, which are detachably mounted on the bracket by fasteners; a pulley ruler detachably mounted on the bracket by fasteners and positioned near the rear mounting base; six pulleys, arranged in pairs, respectively mounted on both sides of the front mounting base, the pulley ruler, and the rear mounting base; and a fixing frame including a front fixing frame, a middle fixing frame, and a rear fixing frame, where the front fixing frame is detachably mounted on the front mounting base, the middle fixing frame is detachably mounted on the middle mounting base, and the rear fixing frame is detachably mounted on the rear mounting base by fasteners. Each of the front, middle, and rear fixing frames has 11 equally spaced filter slits.

Description

Technical Field

[0001] This application belongs to the field of annular spray field testing technology, and specifically relates to an optical path calibration tool and method for annular spray field testing. Background Technology

[0002] The Setscan test bench can simultaneously measure the distribution and particle size of a planar liquid mist. Due to its high precision and lack of interference with flow, it is widely used in measuring nozzle atomization performance. The basic working principle of Setscan is that six laser beams cover the entire measurement plane, with each group of three laser beams forming a set. Two different sets of laser beams are positioned at a 6-degree angle. By measuring the extinction and scattered light signals of the spray droplets across the entire plane, concentration and particle size are calculated. Through photoelectric conversion and data processing, information such as the velocity and particle size of the liquid mist particles can be obtained.

[0003] When using Setscan to measure nozzle atomization performance, it is necessary to correlate the position and momentum information of liquid mist particles in the spray measurement plane with the data acquired by the software. Currently, under nozzle oil supply conditions, a calibration tool that relies on visual alignment is used. This tool has poor compatibility with the software, and because the measurement point volume is very small, visual alignment relies heavily on subjective judgment. Manual measurement of the oil mist measurement cross-section results in large errors. In addition, the alignment process requires starting the test equipment, which wastes energy.

[0004] Therefore, there is an urgent need for a technical solution to overcome or mitigate at least one of the aforementioned defects in the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide an optical path calibration tool and method for testing annular spray fields, in order to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of this application provides an optical path calibration tool for testing annular spray fields, the optical path calibration tool comprising:

[0008] The bracket is rod-shaped and has multiple mounting holes.

[0009] The mounting base includes a front mounting base, a middle mounting base, and a rear mounting base, wherein the front mounting base, the middle mounting base, and the rear mounting base are detachably mounted on the bracket by fasteners;

[0010] A pulley ruler, which is detachably mounted on the bracket by fasteners and is positioned near the rear mounting base;

[0011] The pulleys include six in total, with the six pulleys arranged in pairs and respectively installed on both sides of the front mounting base, the pulley ruler, and the rear mounting base;

[0012] The mounting bracket includes a front mounting bracket, a middle mounting bracket, and a rear mounting bracket. The front mounting bracket is detachably mounted on the front mounting base by fasteners. The middle mounting bracket is detachably mounted on the middle mounting base by fasteners. The rear mounting bracket is detachably mounted on the rear mounting base by fasteners. Each of the front mounting bracket, the middle mounting bracket, and the rear mounting bracket has 11 filter slits at equal intervals.

[0013] In at least one embodiment of this application, the filter slit is a rectangular hole with a width of 0.5 mm and a height of 10 mm.

[0014] In at least one embodiment of this application, the distance between the filter slits on both sides and the filter slit at the center of the 11 filter slits is 15 mm.

[0015] In at least one embodiment of this application, the fasteners used to install the mounting base and the fixing bracket are screws.

[0016] A second aspect of this application provides an optical path calibration method for testing annular spray fields, based on the optical path calibration tool for testing annular spray fields as described above, the optical path calibration method comprising:

[0017] Place the optical path calibration tool vertically downward on the annular spray field test platform with the pulley side facing down, and adjust the front mounting base, middle mounting base, and pulley ruler so that the optical path calibration tool can slide on the annular spray field test platform;

[0018] Set the level on the optical path calibration tool, rotate the optical path calibration tool, check the levelness of the annular spray field test platform, and adjust the height of the spray field test platform to keep it level.

[0019] The six emitting modules and six receiving modules of the laser were arranged in a ring at a 30-degree angle on the ring spray field test platform. The focal point of the laser sheet on each emitting module was adjusted so that it formed a thin line at the center of the ring spray field test platform.

[0020] Remove the middle fixing bracket on the optical path calibration tool, install the front fixing bracket and the rear fixing bracket, rotate the optical path calibration tool to make the laser sheet light pass through the filter slits on the front fixing bracket and the rear fixing bracket in sequence, and adjust the emission module to make the laser sheet light pass through the first and eleventh filter slits;

[0021] Connect the signal lines of the six receiving modules to the six detector boxes respectively. Remove the front and rear mounting brackets from the optical path calibration tool and install the middle mounting bracket. Connect the power and signal lines of the annular spray field test stand and adjust the focal length of the lens of the annular spray field test stand so that the filter slit at the center of the optical path calibration tool is located at the voltage peak signal position.

[0022] Block the filter slit at the center position, rotate the optical path calibration tool to make the laser sheet light pass through the 1st and 11th filters, and make the laser sheet light perpendicular to the central fixed frame. Record the pixel value of the lowest point voltage value in the annular spray field test platform software at this time. This pixel value is the pixel value of the center position of the laser sheet light.

[0023] Remove the middle mounting bracket from the optical path calibration tool, install the front mounting bracket and the rear mounting bracket, and rotate the optical path calibration tool so that the laser sheet light passes through the filter slits on the front mounting bracket and the rear mounting bracket in sequence. The first and eleventh laser marks from left to right should correspond to the first and eleventh slits in the filter slits, respectively.

[0024] Remove the front and rear mounting brackets from the optical path calibration tool, install the middle mounting bracket, and finely adjust the middle mounting bracket left and right to ensure that the laser sheet light peak is located at the center pixel value.

[0025] In at least one embodiment of this application, the laser sheet has a length of 190 mm and a thickness of 0.5 mm to 0.7 mm.

[0026] The invention has at least the following beneficial technical effects:

[0027] The optical path calibration tool and method for testing annular spray fields disclosed in this application can improve the collimation of the laser optical path and increase the measurement accuracy; the calibration tool can move on the annular spray field test platform, which is convenient to operate; and the size and position of the spray measurement plane and the association of software data acquisition can be completed without turning on the equipment oil supply. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an optical path calibration tool for testing an annular spray field, according to one embodiment of this application.

[0029] in:

[0030] 1-Bracket, 2-Front mounting base, 3-Middle mounting base, 4-Filter slit, 5-Pulley, 6-Pulley ruler, 7-Rear mounting base, 8-Rear fixing bracket, 9-Front fixing bracket, 10-Middle fixing bracket. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0033] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0034] The first aspect of this application provides an optical path calibration tool for testing annular spray fields, comprising: a bracket 1, a mounting base, a pulley ruler 6, a pulley 5, and a fixing frame.

[0035] Specifically, such as Figure 1 As shown, the bracket 1 is rod-shaped and has multiple mounting holes. The mounting base includes a front mounting base 2, a middle mounting base 3, and a rear mounting base 7. The front mounting base 2, the middle mounting base 3, and the rear mounting base 7 are detachably mounted on the bracket 1 by fasteners. The pulley ruler 6 is detachably mounted on the bracket 1 by fasteners and is positioned near the rear mounting base 7. There are 6 pulleys 5, which are arranged in pairs and installed on both sides of the front mounting base 2, the pulley ruler 6, and the rear mounting base 7, respectively. The fixing frame includes a front fixing frame 9, a middle fixing frame 10, and a rear fixing frame 8. The front fixing frame 9 is detachably mounted on the front mounting base 2 by fasteners, the middle fixing frame 10 is detachably mounted on the middle mounting base 3 by fasteners, and the rear fixing frame 8 is detachably mounted on the rear mounting base 7 by fasteners. Each of the front fixing frame 9, the middle fixing frame 10, and the rear fixing frame 8 has 11 filter slits 4 at equal intervals.

[0036] The optical path calibration tool for testing annular spray fields in this application comprises a front mounting base 2, a middle mounting base 3, a pulley ruler 6, and a rear mounting base 7, which are fixed to a bracket 1 by screws; six pulleys 5 are fixed in pairs on both sides of the front mounting base 2, the pulley ruler 6, and the rear mounting base 7; a front fixing frame 9 is mounted on the front mounting base 2 by screws; a middle fixing frame 10 is mounted on the middle mounting base 3 by screws; a rear fixing frame 8 is mounted on the rear mounting base 7 by screws; and a filter slit 4, comprising 11 equally spaced slits, is mounted on the rear fixing frame 8, the front fixing frame 9, and the middle fixing frame 10.

[0037] Place the optical path calibration tool vertically downward on the annular spray field test platform with the pulley side facing down. Adjust the front mounting base 2, the middle mounting base 3, and the pulley ruler 6 so that the optical path calibration tool can slide on the annular spray field test platform. Place the level on the optical path calibration tool, rotate the optical path calibration tool, and check the levelness of the annular spray field test platform.

[0038] In a preferred embodiment of this application, each filter slit 4 is a rectangular hole with a width of 0.5 mm and a height of 10 mm. The optical resolution of the instrument is 1 mm for a 10-inch screen, and the hole width is designed to be smaller than the optical resolution. One hole is located in the center, and the remaining 10 holes are all equally spaced. The distance between the slits on both sides and the slit in the center is 15 mm.

[0039] In a horizontal configuration, the optical path calibration tool is placed on the annular spray field test platform. The laser beam from the emitting module should pass through the filter slits 4 on the front mounting 9, the middle mounting 10, and the rear mounting 8 in sequence. Because the laser beam from the emitting module is reflected by the collimating lens, the entire beam may not be able to pass completely through the aperture of the calibration scale. Therefore, the laser is adjusted so that the beam passes through the first and eleventh slits in the filter slit 4.

[0040] Based on the aforementioned optical path calibration tool for annular spray field testing, a second aspect of this application provides an optical path calibration method for annular spray field testing, comprising the following steps:

[0041] Place the optical path calibration tool vertically downward on the annular spray field test platform with the pulley side facing down, and adjust the front mounting base 2, the middle mounting base 3, and the pulley ruler 6 so that the optical path calibration tool can slide on the annular spray field test platform;

[0042] Set the level on the optical path calibration tool, rotate the optical path calibration tool, check the levelness of the annular spray field test platform, and adjust the height of the spray field test platform to keep it level.

[0043] The six emitting modules and six receiving modules of the laser were arranged in a ring at a 30-degree angle on the annular spray field test platform. The focal point of the laser sheet on each emitting module was adjusted so that it formed a thin line at the center of the annular spray field test platform. The laser sheet was approximately 190mm long and 0.5mm-0.7mm thick.

[0044] Remove the middle mounting bracket 10 from the optical path calibration tool, install the front mounting bracket 9 and the rear mounting bracket 8, rotate the optical path calibration tool to make the laser beam pass through the filter slits 4 on the front mounting bracket 9 and the rear mounting bracket 8 in sequence, and adjust the emission modules to make the laser beam pass through the first and eleventh slits in the filter slits 4; after the 6 emission modules are adjusted, ensure that the 6 laser beams are at the center of the instrument opening and at the same height.

[0045] Connect the signal lines of the six receiving modules to the six detector boxes respectively. Remove the front mounting bracket 9 and rear mounting bracket 8 from the optical path calibration tool, install the middle mounting bracket 10, and connect the power and signal lines of the annular spray field test stage. Adjust the focal length of the lens of the annular spray field test stage so that the filter slit 4 at the center of the optical path calibration tool is located at the voltage peak signal position. After the power and signal lines are connected, the original voltage will be displayed on the host screen. Because the laser beam passes through the 11 slits on the calibration ruler, all 11 voltage peak signals need to be displayed on the screen. Adjust the focal length of the lens of the annular spray field test stage to fix the optical path calibration tool to the center slit on the annular spray field test stage, locking the optimal voltage peak signal position to achieve optimal focusing.

[0046] Block the central filter slit 4, rotate the optical path calibration tool to allow the laser beam to pass through the first and eleventh filters in slit 4, with the laser beam perpendicular to the central fixture 10. Record the pixel value of the lowest voltage point in the annular spray field test bench software at this time; this pixel value is the center position pixel value of the laser beam. Record the center position pixel values ​​of the six laser beams using the same method.

[0047] Remove the middle fixing bracket 10 from the optical path calibration tool, install the front fixing bracket 9 and the rear fixing bracket 8, and rotate the optical path calibration tool so that the laser sheet light passes through the filter slits 4 on the front fixing bracket 9 and the rear fixing bracket 8 in sequence. The first and eleventh laser marks from left to right should correspond to the first and eleventh slits in the filter slits 4, respectively.

[0048] Remove the front mounting bracket 9 and rear mounting bracket 8 from the optical path calibration tool, install the middle mounting bracket 10, and finely adjust the middle mounting bracket 10 left and right so that the laser sheet light peak is located at the center pixel value, that is, so that the center of the red cross falls on the voltage peak value. Repeat the above steps for the remaining 5 axes and correlate the center pixel value with the voltage peak value.

[0049] Completing the above steps will achieve optical path calibration of the annular spray field test bench.

[0050] The optical path calibration tool and method for testing annular spray fields disclosed in this application can improve the collimation of the laser optical path and enhance measurement accuracy. It can complete the correlation of spray measurement plane size, position, and software data acquisition without requiring the equipment to be turned on.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical path calibration tool for testing annular spray fields, characterized in that, The optical path calibration tool includes: The bracket (1) is rod-shaped and has multiple mounting holes. The mounting base includes a front mounting base (2), a middle mounting base (3), and a rear mounting base (7), wherein the front mounting base (2), the middle mounting base (3), and the rear mounting base (7) are detachably mounted on the bracket (1) by means of fasteners; A pulley ruler (6) is detachably mounted on the bracket (1) by fasteners and is positioned near the rear mounting seat (7); The pulleys (5) include 6 pulleys, which are arranged in pairs and installed on both sides of the front mounting base (2), the pulley ruler (6), and the rear mounting base (7). The mounting bracket includes a front mounting bracket (9), a middle mounting bracket (10), and a rear mounting bracket (8). The front mounting bracket (9) is detachably mounted on the front mounting base (2) by fasteners. The middle mounting bracket (10) is detachably mounted on the middle mounting base (3) by fasteners. The rear mounting bracket (8) is detachably mounted on the rear mounting base (7) by fasteners. Each of the front mounting bracket (9), the middle mounting bracket (10), and the rear mounting bracket (8) has 11 filter slits (4) spaced at equal intervals.

2. The optical path calibration tool for testing annular spray fields according to claim 1, characterized in that, The filter slit (4) is a rectangular hole with a width of 0.5 mm and a height of 10 mm.

3. The optical path calibration tool for testing annular spray fields according to claim 2, characterized in that, In the 11 filter slits (4), the distance between the filter slits (4) on both sides and the filter slit (4) at the center is 15mm.

4. The optical path calibration tool for testing annular spray fields according to claim 1, characterized in that, The fasteners used to install the mounting base and the fixing bracket are screws.

5. An optical path calibration method for testing annular spray fields, based on the optical path calibration tool for testing annular spray fields according to any one of claims 1 to 4, characterized in that, The optical path calibration method includes: Place the optical path calibration tool vertically downward on the annular spray field test platform with the pulley side facing down, and adjust the front mounting base (2), the middle mounting base (3), and the pulley ruler (6) so that the optical path calibration tool can slide on the annular spray field test platform; Set the level on the optical path calibration tool, rotate the optical path calibration tool, check the levelness of the annular spray field test platform, and adjust the height of the spray field test platform to keep it level. The six emitting modules and six receiving modules of the laser were arranged in a ring at a 30-degree angle on the ring spray field test platform. The focal point of the laser sheet on each emitting module was adjusted so that it formed a thin line at the center of the ring spray field test platform. Remove the middle fixing frame (10) on the optical path calibration tool, install the front fixing frame (9) and the rear fixing frame (8), rotate the optical path calibration tool so that the laser sheet light passes through the filter slits (4) on the front fixing frame (9) and the rear fixing frame (8) in sequence, and adjust the emission module so that the laser sheet light passes through the first and eleventh slits (4) in the filter slits (4); Connect the signal lines of the six receiving modules to the six detector boxes respectively, remove the front mounting bracket (9) and rear mounting bracket (8) on the optical path calibration tool, install the middle mounting bracket (10), connect the power line and signal line of the annular spray field test platform, adjust the focal length of the lens of the annular spray field test platform so that the filter slit (4) at the center of the optical path calibration tool is located at the voltage peak signal position. Block the filter slit (4) at the center position, rotate the optical path calibration tool to make the laser sheet light pass through the first and eleventh lines of the filter slit (4), and make the laser sheet light perpendicular to the central fixing frame (10). Record the pixel value of the lowest point voltage value in the annular spray field test bench software at this time. This pixel value is the pixel value of the center position of the laser sheet light. Remove the middle mounting bracket (10) on the optical path calibration tool, install the front mounting bracket (9) and the rear mounting bracket (8), rotate the optical path calibration tool so that the laser sheet light passes through the filter slits (4) on the front mounting bracket (9) and the rear mounting bracket (8) in sequence. The first and eleventh laser marks from left to right should correspond to the first and eleventh slits in the filter slits (4) respectively. Remove the front mounting bracket (9) and rear mounting bracket (8) from the optical path calibration tool, install the middle mounting bracket (10), and finely adjust the middle mounting bracket (10) left and right so that the laser sheet light peak is located at the center pixel value.

6. The optical path calibration method for testing annular spray fields according to claim 5, characterized in that, The laser sheet has a length of 190mm and a thickness of 0.5mm-0.7mm.

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