CN110987177B - Light parallelism measuring device and porous spray testing system applying same - Google Patents
Light parallelism measuring device and porous spray testing system applying same Download PDFInfo
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- CN110987177B CN110987177B CN201911342011.7A CN201911342011A CN110987177B CN 110987177 B CN110987177 B CN 110987177B CN 201911342011 A CN201911342011 A CN 201911342011A CN 110987177 B CN110987177 B CN 110987177B
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- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 239000007921 spray Substances 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005381 potential energy Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
Abstract
The invention belongs to the technical field of diesel engine fuel system spray form testing, and particularly relates to a light parallelism measuring device and a porous spray testing system using the same. The light parallelism measuring device based on the photoelectric effect can amplify tiny non-parallelism of light by multiple times, measure the light intensity of different positions by utilizing the piezoelectric sensor, and convert the light intensity into electric potential energy, thereby intuitively quantifying the non-parallelism and the parallelism of the light, and having important significance for accurately determining the light parallelism, improving the testing precision and the testing definition of optical testing and increasing the signal-to-noise ratio of a testing result. The porous spraying test system using the light parallelism measuring device ensures that the test system can normally work only when the light is absolutely parallel, thereby improving the test precision and the test definition of the optical test and increasing the signal-to-noise ratio of the test result.
Description
Technical Field
The invention belongs to the technical field of diesel engine fuel system spray form testing, and particularly relates to a light parallelism measuring device and a porous spray testing system using the same.
Background
The optical test has great practical value and wide application in different fields, and along with the improvement of the complexity of the tested object and the severe test environment, the test precision and the test definition of the optical test are improved from different angles, and the signal-to-noise ratio of the test result is increased, so that the optical test has become an increasingly important research direction.
In most optical testing processes, parallel light is used as measuring light, so that non-parallel light emitted by a point light source or a line light source needs to be changed into parallel light to participate in measurement, and the parallelism of the parallel light is determined to have an extremely important influence on a testing result by the principle of optical testing.
However, no special equipment for evaluating the parallelism of light rays exists in the current optical test, so that whether the light rays are parallel light or not is determined mainly by equipment parameters and the size of an observed light spot in the process of an optical experiment, which is inaccurate.
Disclosure of Invention
The invention aims to provide a light parallelism measuring device which can quantitatively observe the parallelism of light rays in a spray test system, thereby improving the test precision and the test definition of optical test and increasing the signal-to-noise ratio of a test result.
The purpose of the invention is realized by the following technical scheme: the device comprises a plane lens group, a photoelectric sensor, a voltage amplifier and a potential difference measuring device; the planar lens group consists of planar lenses with different densities, all the planar lenses are arranged and tightly attached one by one according to a density sequence, wherein the density value of the planar lens with the minimum density value is greater than the density of air; the photoelectric sensors are concentrically and annularly arranged to receive light refracted by the planar lens group, the light passing through the planar lens group irradiates different photoelectric sensor rings to excite different electric potentials, different electric potential measuring pins are respectively led out from the different photoelectric sensor rings, and the excited electric potentials of the photoelectric sensors are output; the voltage amplifier amplifies the excitation potential of the photoelectric sensor; the potential difference measuring device measures the difference value between the potential of the photoelectric sensor at the central part and the potential of the photoelectric sensor at the periphery; the detected light is incident from the direction of the lens with the maximum density in the plane lens group; when the detected light is divergent light, the light passing through the planar lens group can move upwards on the photoelectric sensor to form a light ring with darker center and brighter periphery, so that the photoelectric sensor generates larger electric energy at the light ring to generate higher excitation potential, and generates lower potential at the darker center, the potential difference measuring device outputs negative potential difference, the negative sign represents that the incident light is divergent light, the magnitude of the numerical absolute value represents the divergence degree of the divergent light, and the greater the divergence degree, the greater the absolute value of the potential difference; when the detected light is convergent light, the light passing through the planar lens group can move upwards on the photoelectric sensor to form a light spot with brighter center and darker periphery, so that the photoelectric sensor generates larger electric energy at the light spot to generate higher excitation potential and generates lower potential at the peripheral darker part, the potential difference measuring device outputs positive potential difference, the positive sign represents that the incident light is convergent light, the magnitude of the numerical value absolute value represents the convergent degree of the convergent light, and the greater the convergent degree is, the greater the absolute value of the potential difference is; when the detected light is parallel light, the electric potentials of the photoelectric sensors at all positions are equal, and the output result of the potential difference measuring device is 0; by observing the numerical value output by the potential difference measuring device, the properties and the non-parallel degree of the detected light rays can be clearly quantified.
The invention also aims to provide a multi-hole spraying test system applying the light parallelism measuring device.
The purpose of the invention is realized by the following technical scheme: the high-speed camera comprises a high-intensity LED array light source, a slit, a first convex lens, a second convex lens, a light parallelism measuring device, a spectroscope, a constant volume bomb, a knife edge and a high-speed camera; the light ray parallelism measuring device comprises a plane lens group, a photoelectric sensor, a voltage amplifier and a potential difference measuring device; the planar lens group consists of planar lenses with different densities, all the planar lenses are arranged and tightly attached one by one according to a density sequence, wherein the density value of the planar lens with the minimum density value is greater than the density of air; the photoelectric sensors are concentrically and annularly arranged to receive light refracted by the planar lens group, the light passing through the planar lens group irradiates different photoelectric sensor rings to excite different electric potentials, different electric potential measuring pins are respectively led out from the different photoelectric sensor rings, and the excited electric potentials of the photoelectric sensors are output; the voltage amplifier amplifies the excitation potential of the photoelectric sensor; the potential difference measuring device measures the difference value between the potential of the photoelectric sensor at the central part and the potential of the photoelectric sensor at the periphery; one end of the constant volume bomb is provided with a glass end cover, the other end of the constant volume bomb is provided with a plane mirror end cover, and a porous oil sprayer is arranged on the plane mirror end cover; light rays emitted by the high-intensity LED array light source are changed into linear divergent light after passing through the slit, the linear divergent light is changed into parallel light rays after being refracted by the first convex lens, and the parallel light rays are incident from the direction of the lens with the maximum density in the light parallelism measuring device; if the light is absolute parallel light, the output result of the potential difference measuring device of the light parallelism measuring device is 0; if the light rays comprise divergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a negative value; if the light rays comprise convergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a positive value; therefore, when the output result of the potential difference measuring device of the light parallelism measuring device is 0, the light refracted by the first convex lens is judged to be absolute parallel light, at the moment, the photoelectric sensor, the voltage amplifier and the potential difference measuring device of the light parallelism measuring device are removed, the absolute parallel light passes through the planar lens group and then is emitted into the spectroscope, the light passing through the spectroscope is emitted to the constant volume bomb, the light passes through the glass end cover of the constant volume bomb and then enters the test flow field area inside the constant volume bomb, the light is reflected by the flat mirror end cover of the constant volume bomb and then is transmitted in the reverse direction to reach the spectroscope again, and the light is reflected by the spectroscope to the second convex lens to be converged and then enters the high-speed camera through the knife edge; when no flow field change exists in the constant volume bomb, light rays are always kept parallel and finally converged at the knife edge to enter the high-speed camera, and a test area with uniform brightness is displayed in the camera; when a variable flow field appears in the constant volume bomb, due to the difference of the density of the flow field, parallel light rays can be deflected to different degrees, the deflected light rays cannot be converged to a focus at the knife edge, so that the light rays can be blocked by the knife edge, a darker area can be generated in the camera at the position where the blocked light rays are located previously, and the form change of the spray flow field can be measured.
The invention has the beneficial effects that:
the light parallelism measuring device based on the photoelectric effect can amplify tiny non-parallelism of light by multiple times, measure the light intensity of different positions by utilizing the piezoelectric sensor, and convert the light intensity into electric potential energy, thereby intuitively quantifying the non-parallelism and the parallelism of the light, and having important significance for accurately determining the light parallelism, improving the testing precision and the testing definition of optical testing and increasing the signal-to-noise ratio of a testing result. The porous spraying test system using the light parallelism measuring device ensures that the test system can normally work only when the light is absolutely parallel, thereby improving the test precision and the test definition of the optical test and increasing the signal-to-noise ratio of the test result.
Drawings
FIG. 1 is a schematic view of a device for measuring parallelism of light rays according to the present invention.
FIG. 2 is a schematic view of a multi-hole spray test system using a light parallelism measuring apparatus according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention designs a light parallelism measuring device based on photoelectric effect and a porous spray testing system applying the device, and relates to the field of spray form testing of diesel engine fuel systems. The light parallelism measuring device solves the problem that the light parallelism in the traditional optical test system is difficult to measure, improves the parallelism of parallel light and the precision of optical test, and has great practical significance and value.
As shown in fig. 1, a device for measuring parallelism of light based on photoelectric effect mainly includes a planar lens set with different densities, a photoelectric sensor 11, a voltage amplifier 12, a potential difference measuring device 14, a single chip microcomputer 15, a digital display 16, etc., wherein the planar lenses with different densities are sequentially arranged and closely attached according to a density sequence, the density value difference between adjacent lenses is large, and the minimum density value in the lenses is larger than the density of air. When the detected light is divergent light, the light passing through the lens group can move upwards on the photoelectric sensor to form a light ring with darker center and brighter periphery, so that the photoelectric sensor generates larger electric energy at the light ring to generate higher excitation potential, and generates lower potential at the darker center, and the peripheral potential is subtracted from the central potential to obtain a negative potential difference, wherein the negative sign represents that the incident light is divergent light, the absolute value of the numerical value represents the divergence degree of the divergent light, and the larger the divergence degree is, the larger the absolute value of the potential difference is; when the detected light is convergent light, the light passing through the lens group can move upwards on the photoelectric sensor to form a light spot with brighter center and darker periphery, so that the photoelectric sensor generates larger electric energy at the light spot to generate higher excitation potential and generates lower potential at the peripheral darker part, the peripheral potential is subtracted from the central potential to obtain a positive potential difference, the positive sign represents that the incident light is convergent light, the magnitude of a numerical value absolute value represents the convergence degree of the convergent light, and the larger the convergence degree is, the larger the absolute value of the potential difference is; when parallel light enters, the electric potentials at all positions on the photoelectric sensor are equal, the numerical value of the digital display is 0, and the properties and the non-parallelism degree of the measured light rays can be clearly quantized by observing the numerical value of the digital display.
The invention uses the photoelectric sensor to receive the light refracted by the lens, converts different light intensities into different electric potential energy, converts optical signals into electric signals, and measures the numerical value of the electric signals, thereby realizing the numerical value quantization of light properties.
The photoelectric sensors are arranged in a concentric ring shape, and light rays passing through the lens group irradiate different photoelectric sensor rings to excite different electric potentials. Different potential measuring pins are respectively led out from different photoelectric sensor rings, and the excitation potential of the photoelectric sensor is output. The excitation potential of the photosensor is amplified using a voltage amplifier. Since the excitation potential value of the photosensor is small, direct measurement has a large interference error and therefore the excitation potential is amplified using a voltage amplification device. The non-parallelism degree of the non-parallel light rays is represented by the absolute value of the maximum difference value of the potential of the central-part photoelectric sensor and the potential of the peripheral photoelectric sensor, and the larger the absolute value is, the higher the non-parallelism degree is. The property of the unparallel light is represented by the positive and negative signs of the difference value between the potential of the photoelectric sensor at the central part and the potential of the photoelectric sensor at the periphery, the positive value represents convergent light, and the negative value represents divergent light.
The light parallelism measuring device based on the photoelectric effect can amplify tiny non-parallelism of light by multiple times, measure the light intensity of different positions by utilizing the piezoelectric sensor, and convert the light intensity into electric potential energy, thereby intuitively quantifying the non-parallelism and the parallelism of the light, and having important significance for accurately determining the light parallelism, improving the testing precision and the testing definition of optical testing and increasing the signal-to-noise ratio of a testing result.
As shown in fig. 2, a multi-hole spraying test system using a light parallelism measuring device includes a high-intensity LED array light source 1, a slit 2, a first convex lens 3, a second convex lens 7, a light parallelism measuring device, a spectroscope 4, a constant volume bomb 5, a knife edge 8, and a high-speed camera 9. One end of the constant volume bomb is provided with a glass end cover, the other end of the constant volume bomb is provided with a plane mirror end cover 10, and the plane mirror end cover is provided with a porous oil sprayer 6. The test principle of the test system is as follows: light emitted by a high-intensity LED array light source is changed into linear divergent light after passing through a slit, the divergent light is changed into parallel light after being refracted by a first convex lens, if a parallel light parallelism measuring device is not additionally arranged, the parallel light passes through a spectroscope and a quartz glass end cover on a constant volume bomb to enter a test flow field area in the constant volume bomb, then the parallel light is reflected by a plane mirror end cover and reversely propagates to reach the spectroscope again, the parallel light is reflected to a second convex lens to be converged, when no flow field change exists in the constant volume bomb, the light is always parallel and finally converged at a knife edge to enter a high-speed camera, at the moment, a test area with uniform brightness is displayed in the camera, when a changed flow field exists in the constant volume bomb, the parallel light can be deflected to different degrees due to different density of the flow field, the deflected light can not be converged at the focus at the knife edge, and therefore can be blocked by the knife edge, the previously blocked position of the light creates a darker area in the camera, so that changes in the shape of the spray flow field can be detected. However, in the actual operation process, due to the processing error of the components, the precision limit of manual operation and the unreliability of observing the parallelism of the light rays by naked eyes, the light rays emitted by the light source cannot be guaranteed to be absolutely parallel after passing through the slit and the first convex lens, which brings errors to the test result. The parallel light ray parallelism measuring device can measure and judge the parallelism of light rays behind the first convex lens, and the parallel light rays enter from the direction of the lens with the maximum density in the light ray parallelism measuring device; if the light is absolute parallel light, the output result of the potential difference measuring device of the light parallelism measuring device is 0; if the light rays comprise divergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a negative value; if the light rays comprise convergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a positive value; therefore, the light ray parallelism measuring device ensures that the light rays refracted by the first convex lens are absolute parallel light rays only when the output result of the potential difference measuring device is 0, the photoelectric sensor, the voltage amplifier and the potential difference measuring device of the light ray parallelism measuring device are removed, and the absolute parallel light rays are emitted into the spectroscope after passing through the plane lens group. The device uses the light parallelism measuring device to carry out measurement, and ensures that the test system can normally work only when the light is absolutely parallel, thereby improving the test precision and the test definition of the optical test and increasing the signal-to-noise ratio of the test result.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A light parallelism measuring device is characterized in that: the device comprises a plane lens group, a photoelectric sensor, a voltage amplifier and a potential difference measuring device; the planar lens group consists of planar lenses with different densities, all the planar lenses are arranged and tightly attached one by one according to a density sequence, wherein the density value of the planar lens with the minimum density value is greater than the density of air; the photoelectric sensors are concentrically and annularly arranged to receive light refracted by the planar lens group, the light passing through the planar lens group irradiates different photoelectric sensor rings to excite different electric potentials, different electric potential measuring pins are respectively led out from the different photoelectric sensor rings, and the excited electric potentials of the photoelectric sensors are output; the voltage amplifier amplifies the excitation potential of the photoelectric sensor; the potential difference measuring device measures the difference value between the potential of the photoelectric sensor at the central part and the potential of the photoelectric sensor at the periphery; the detected light is incident from the direction of the lens with the maximum density in the plane lens group; when the detected light is divergent light, the light passing through the planar lens group forms a light ring with darker center and brighter periphery on the photoelectric sensor, so that the photoelectric sensor generates larger electric energy at the light ring to generate higher excitation potential, and generates lower potential at the darker center, the potential difference measuring device outputs a negative potential difference, the negative sign represents that the incident light is divergent light, the magnitude of the numerical absolute value represents the divergence degree of the divergent light, and the greater the divergence degree, the greater the absolute value of the potential difference; when the detected light is convergent light, the light passing through the planar lens group forms a light spot with brighter center and darker periphery on the photoelectric sensor, so that the photoelectric sensor generates larger electric energy at the light spot to generate higher excitation potential and generates lower potential at the peripheral darker part, the potential difference measuring device outputs positive potential difference, the positive sign represents that the incident light is convergent light, the magnitude of the numerical value absolute value represents the convergent degree of the convergent light, and the greater the convergent degree is, the greater the absolute value of the potential difference is; when the detected light is parallel light, the electric potentials of the photoelectric sensors at all positions are equal, and the output result of the potential difference measuring device is 0; by observing the numerical value output by the potential difference measuring device, the properties and the non-parallel degree of the detected light rays can be clearly quantified.
2. A porous spraying test system applying a light parallelism measuring device is characterized in that: the high-speed camera comprises a high-intensity LED array light source, a slit, a first convex lens, a second convex lens, a light parallelism measuring device, a spectroscope, a constant volume bomb, a knife edge and a high-speed camera; the light ray parallelism measuring device comprises a plane lens group, a photoelectric sensor, a voltage amplifier and a potential difference measuring device; the planar lens group consists of planar lenses with different densities, all the planar lenses are arranged and tightly attached one by one according to a density sequence, wherein the density value of the planar lens with the minimum density value is greater than the density of air; the photoelectric sensors are concentrically and annularly arranged to receive light refracted by the planar lens group, the light passing through the planar lens group irradiates different photoelectric sensor rings to excite different electric potentials, different electric potential measuring pins are respectively led out from the different photoelectric sensor rings, and the excited electric potentials of the photoelectric sensors are output; the voltage amplifier amplifies the excitation potential of the photoelectric sensor; the potential difference measuring device measures the difference value between the potential of the photoelectric sensor at the central part and the potential of the photoelectric sensor at the periphery; one end of the constant volume bomb is provided with a glass end cover, the other end of the constant volume bomb is provided with a plane mirror end cover, and a porous oil sprayer is arranged on the plane mirror end cover; light rays emitted by the high-intensity LED array light source are changed into linear divergent light after passing through the slit, the linear divergent light is changed into parallel light rays after being refracted by the first convex lens, and the parallel light rays are incident from the direction of the lens with the maximum density in the light parallelism measuring device; if the light is absolute parallel light, the output result of the potential difference measuring device of the light parallelism measuring device is 0; if the light rays comprise divergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a negative value; if the light rays comprise convergent light rays, the output result of the potential difference measuring device of the light ray parallelism measuring device is a positive value; therefore, when the output result of the potential difference measuring device of the light parallelism measuring device is 0, the light refracted by the first convex lens is judged to be absolute parallel light, at the moment, the photoelectric sensor, the voltage amplifier and the potential difference measuring device of the light parallelism measuring device are removed, the absolute parallel light passes through the planar lens group and then is emitted into the spectroscope, the light passing through the spectroscope is emitted to the constant volume bomb, the light passes through the glass end cover of the constant volume bomb and then enters the test flow field area inside the constant volume bomb, the light is reflected by the flat mirror end cover of the constant volume bomb and then is transmitted in the reverse direction to reach the spectroscope again, and the light is reflected by the spectroscope to the second convex lens to be converged and then enters the high-speed camera through the knife edge; when no flow field change exists in the constant volume bomb, light rays are always kept parallel and finally converged at the knife edge to enter the high-speed camera, and a test area with uniform brightness is displayed in the camera; when a variable flow field appears in the constant volume bomb, due to the difference of the density of the flow field, parallel light rays can be deflected to different degrees, the deflected light rays cannot be converged to a focus at the knife edge, so that the light rays can be blocked by the knife edge, a darker area can be generated in the camera at the position where the blocked light rays are located previously, and the form change of the spray flow field can be measured.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000136982A (en) * | 1998-10-30 | 2000-05-16 | Hoya Corp | Method and device for inspecting array element |
| CN102426043A (en) * | 2011-09-15 | 2012-04-25 | 深圳市华测检测技术股份有限公司 | Photodetection device for liquid level |
| CN109342031A (en) * | 2018-12-04 | 2019-02-15 | 桂林聚联科技有限公司 | A kind of light power meter receiving transducer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000136982A (en) * | 1998-10-30 | 2000-05-16 | Hoya Corp | Method and device for inspecting array element |
| CN102426043A (en) * | 2011-09-15 | 2012-04-25 | 深圳市华测检测技术股份有限公司 | Photodetection device for liquid level |
| CN109342031A (en) * | 2018-12-04 | 2019-02-15 | 桂林聚联科技有限公司 | A kind of light power meter receiving transducer |
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