CN111856764B - Method and device for checking lens spacing in Galileo beam expander - Google Patents
Method and device for checking lens spacing in Galileo beam expander Download PDFInfo
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- CN111856764B CN111856764B CN202010720077.1A CN202010720077A CN111856764B CN 111856764 B CN111856764 B CN 111856764B CN 202010720077 A CN202010720077 A CN 202010720077A CN 111856764 B CN111856764 B CN 111856764B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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Abstract
The invention discloses a method and a device for checking the distance between lenses in a Galileo beam expander, which comprises the following steps: inputting an emergent beam radius, wherein the emergent beam radius is the beam radius acting on the surface of an object after passing through a Galileo beam expander; calculating to obtain the theoretical distance of the lens according to the checking rule; the actual spacing of the lenses is adjusted so that the actual radius of the contrasting outgoing beam is equal to the input radius. The invention checks according to the working principle of the Galileo beam expander, determines the working state of the Galileo beam expander, and further floatingly adjusts the distance between the lenses, so that the light beam can act on the surface of a punching object with the optimal caliber after passing through the Galileo beam expander.
Description
Technical Field
The invention relates to the technical field of cigarette laser processing, in particular to a method and a device for checking the distance between lenses in a Galileo beam expander.
Background
The cigarette tipping paper is designed to be punched to reduce tar and harm of the cigarette, and the essence of the cigarette is that external air enters a filter tip from the punched part of the tipping paper to be mixed with smoke when the cigarette is smoked, so that the aim of reducing the tar content in the smoke is fulfilled. The tipping paper punching technology is an important technology for realizing the technical design index of cigarettes. The small holes with the designed quantity are burnt on the cigarette tipping paper in an off-line/on-line mode according to the product process standard, so that the ventilation degree of the cigarette product is ensured to fall within the design range. The on-line cigarette laser drilling technology is one kind of tipping paper drilling technology. Some equipment uses the resonant cavity to produce the laser beam, relies on Galileo formula beam expander to change beam diameter to let the laser beam fall on cigarette in-process through the light path design, accomplish the work of punching.
In recent years, with the increase of the variety of cigarette products and the improvement of the quality requirement of the cigarette products, the demand and the requirement for online double-row hole punching are continuously improved. In order to improve the punching quality, a method for checking the distance between the first lens and the second lens in the galilean beam expander is needed, and the actual distance between the lenses is optimally adjusted to ensure that the light beam acts on the surface of the punched object with the optimal aperture.
Disclosure of Invention
The invention aims to provide a method and a device for checking the distance between lenses in a Galileo beam expander, which are used for checking according to the working principle of the Galileo beam expander and adjusting the distance between the lenses in a floating mode, so that light beams passing through the Galileo beam expander can act on the surface of a punched object with the optimal caliber.
According to a first aspect of the present invention, there is provided a method for verifying a lens pitch in a galilean beam expander, comprising:
inputting an emergent beam radius, wherein the emergent beam radius is the beam radius acting on the surface of an object after passing through a Galileo beam expander;
calculating to obtain the theoretical distance of the lens according to the checking rule;
adjusting the actual spacing of the lenses by a controller according to the theoretical spacing;
and comparing and detecting whether the actual radius of the emergent light beam meets the requirement.
Further, the calculation method of the check rule is as follows:
wherein the content of the first and second substances,
c1 is the radius of incident light, unit mm, fixed parameter;
f1 is the focal length of the first lens of the Galileo beam expander, unit mm, fixed parameter;
f2 is the focal length of the second lens of the Galileo beam expander, unit mm, and fixed parameters;
f is a fixed parameter of the distance between the surface of the action object and the first lens of the Galileo beam expander, unit mm;
c2 is the radius of the beam acting on the surface of the object after passing through the Galileo beam expander, unit mm, input radius, i.e. the desired value;
d is the distance between the first lens of the Galileo beam expander and the second lens of the Galileo beam expander, and the unit mm is a theoretical spacing value.
Further, before calculating the theoretical lens spacing according to the inspection rule, the method further comprises:
inputting fixed parameters in a check rule calculation mode;
temporarily storing the fixed parameters until the next recording;
and after the radius of the emergent light beam is input, calculating a theoretical spacing value according to the temporarily stored fixed parameters through a checking rule.
Further, adjusting the actual pitch of the lenses comprises:
presetting an adjustment range (d-rho, d + rho), wherein d is a theoretical spacing value and a rho error allowable value;
adjusting the actual spacing of the lenses within the adjustment range by a controller;
detecting the actual radius of the emergent beam and the actual distance between the lenses;
the actual spacing corresponding to the actual radius of the emergent beam is recorded.
Further, comparing and detecting whether the actual radius of the outgoing beam meets the requirement specifically includes:
the allowable error range is preset to be within a predetermined range,
calculating the difference between the actual radius and the input radius;
and if the difference is detected to be within the error range, the actual radius meets the requirement.
Further, when the actual radius meets the requirement:
the smaller the absolute value of the difference, the closer the actual radius is to the input radius;
and selecting the actual distance corresponding to the actual radius when the absolute value of the difference is minimum so as to obtain the optimal emergent light beam.
According to a second aspect of the present invention, there is provided an apparatus for verifying a lens pitch in a galilean beam expander, comprising:
the input module is used for inputting the radius of an emergent beam, and the radius of the emergent beam is an expected value or the distance between input lenses;
the data processing module is used for calculating the theoretical distance of the lens or the theoretical radius of the backward-thrust emergent light beam according to the check rule;
the adjusting module adjusts the actual distance of the lenses through the controller according to the theoretical distance;
and the comparison detection module is used for comparing and detecting whether the actual radius of the emitted light beam meets the requirement.
Further, the data processing unit includes:
the parameter input unit is used for inputting fixed parameters in the verification rule;
the data temporary storage unit is used for temporarily storing the recorded fixed parameters;
and the calculation processing unit is used for processing the data according to the calculation mode of the check rule.
Further, the adjusting module comprises:
a floating adjustment unit for adjusting the actual distance between the lenses within the adjustment range by the controller;
a first detection unit that detects an actual radius of the outgoing beam;
a second detection unit that detects an actual pitch of the lenses;
and the recording and storing unit is used for recording the actual distance corresponding to the actual radius of the emergent light beam.
Further, the contrast detection module comprises:
a difference value calculating unit calculating a difference value between the actual radius and the input radius;
and the floating detection unit detects whether the difference value falls within the error range.
The invention has the beneficial effects that: 1. checking according to the working principle of the Galileo beam expander, when the radius of an emergent beam expected by a requirement is known, calculating a theoretical value of the distance between lenses, detecting the actual radius of the emergent beam to reach the required expected value by adjusting the actual distance between the lenses, and recording the actual distance of the lens at the moment, wherein the actual distance is the optimal distance for obtaining the expected beam. Errors may exist between the actual spacing and the theoretical value, but the actual spacing should fluctuate near the theoretical value, and if the difference between the actual spacing and the theoretical value is too large, the galileo beam expander may have related process defects or problems; if the floating condition between the actual distance and the theoretical value is reasonable, the Galileo beam expander can be considered to work normally, equipment can be checked on the Galileo beam expander regularly, and the equipment can work normally. 2. The distance between the lenses can be adjusted in a floating way by calculating a required expected value of the emergent beam of the Galileo beam expander, the distance between the lenses can be adjusted near a theoretical value, the radius of the emergent beam meets the requirement, the actual distance between the lenses under the expected value is confirmed and recorded on a case, and the follow-up related work of workers is facilitated. The expected demand value can be a plurality of groups of commonly used aperture values, and can be directly tabulated to be used as experience recommendation of the equipment, so that practice work aiming at actual demands is not needed, and the energy of experimenters is wasted.
Drawings
FIG. 1 is a flow chart of a method for verifying lens pitch in a Galileo beam expander according to an embodiment of the present invention;
FIG. 2 is a block diagram of an apparatus for verifying the pitch of lenses in a Galileo beam expander, in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a data processing module according to an embodiment of the present invention;
FIG. 4 is a block diagram of a specific structure of an adjustment module according to an embodiment of the present invention;
fig. 5 is a block diagram of a specific structure of the contrast detection module according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
FIG. 1 shows a flow chart of a method for verifying lens pitch in a Galileo beam expander according to one embodiment of the present invention, comprising:
step S101: the input exit beam radius (desired value).
In the embodiment of the invention, the radius of the outgoing beam is the radius of the beam acting on the surface of the object after passing through the Galileo beam expander, and the radius of the outgoing beam is a required expected value. The expected value of the radius of the outgoing beam can be the aperture value required in actual production, a plurality of groups of actually required aperture values can be set for testing, data is recorded in the data, and the outgoing beam meeting the requirement can be obtained by directly using the test values in the subsequent production. The caliber testing result of the actual demand can be arranged and tabulated to be used as a verification recommendation table of a worker.
Step S102: and calculating to obtain the theoretical distance of the lens according to the checking rule.
In the embodiment of the invention, the check rule is a calculation formula:
wherein the specific parameters are explained as follows
c1 is the radius of incident light, unit mm, fixed parameter;
f1 is the focal length of the first lens of the Galileo beam expander, unit mm, fixed parameter;
f2 is the focal length of the second lens of the Galileo beam expander, unit mm, and fixed parameters;
f is a fixed parameter of the distance between the surface of the action object and the first lens of the Galileo beam expander, unit mm;
c2 is the radius of the beam acting on the surface of the object after passing through the Galileo beam expander, unit mm, input radius, i.e. the desired value;
d is the distance between the first lens of the Galileo beam expander and the second lens of the Galileo beam expander, and the unit mm is a theoretical spacing value.
In the embodiment of the present invention, the basic parameters of the galileo beam expander include: the basic parameters are fixed parameters and can be obtained in specifications provided by equipment suppliers or experimental measurements. The two lenses in the beam expander can fix the first lens, and the second lens is moved to change the distance between the lenses, so that the distance between the surface of the action object and the first lens of the Galileo beam expander can be a fixed value, namely a fixed parameter.
The radius of the emergent light input in the step S101 is c2, the theoretical distance of the lens is d, and when the radius of the emergent light is input, the theoretical distance d of the lens can be calculated according to a calculation formula. It can be understood that, in practical application, the theoretical data may have a deviation, so that the radius of the emergent light may fluctuate in practice to some extent, and there is an error with the theoretical value. The theoretical value of the lens pitch provides a reference value around which a point can be found at which the radius of the outgoing beam is equal to the desired value of the input, i.e. the actual pitch of the lens that meets the desired value. When the fluctuation range is within the allowable error range, the Galileo beam expander is understood to be in a normal working state, and when the fluctuation range is larger, the problems and the defects of relevant processes or other aspects of the Galileo beam expander are understood to occur.
It will be appreciated that there are only two variables c2 and d in the calculation formula. When the input data is changed to d, the result obtained from the calculation formula is c2, which is the inverse of the calculation formula. In the case of reverse thrust, the galileo beam expander operates:
the actual pitch of the lenses and the actual radius of the outgoing beam at that time are measured. The actual distance of the lens can be input, the theoretical radius of the emergent beam at the distance of the lens can be obtained through calculation according to a calculation formula, and the measured actual radius of the emergent beam is compared with the theoretical radius of the emergent beam. The actual radius of the emergent beam reflects the working state of the Galileo beam expander, and the theoretical radius of the emergent beam is standard data for measuring the working state. When the error between the standard data and the actual data is within the error range, the Galileo beam expander can be considered to be in a normal working state; when the error between the standard data and the actual data exceeds the error range, the problems and defects of the related process or other aspects of the Galileo beam expander can be considered.
Step S103: the actual pitch of the lenses is adjusted by the controller based on the theoretical pitch.
In the embodiment of the invention, after the theoretical spacing is obtained, the lens can be adjusted by referring to the theoretical spacing value. The actual pitch of the lenses may be adjusted by a controller, which may adjust the actual pitch of the lenses by computer control of the adjustment drive. When the controller is used for adjusting the lens spacing, an adjustment range can be preset according to the theoretical spacing value, the adjustment range can be determined to be close to the theoretical value, and the adjustment range can be preset to be (d-rho, d + rho), wherein d is the theoretical spacing value and rho error allowable value. And adjusting the actual distance of the lens by the controller in the adjusting range, adjusting the lens gradually along the scale by the controller, and detecting and recording the distance of the lens and the actual radius of the emergent light beam corresponding to the distance in real time. A coordinate system can be established according to the adjustment range and the actual radius of the emergent beam, a curve is made, and the fluctuation condition of the actual radius of the emergent beam can be visually reflected, so that a worker can conveniently perform data analysis and later-stage related work.
Step S104: and comparing and detecting whether the actual radius of the emitted light beam meets the requirement.
In the embodiment of the invention, an allowable error range can be preset, the actual radius of the emergent beam can be detected in real time, and the actual radius and the input radius are calculated to obtain a real-time difference value. Detecting whether the difference value belongs to an error range, and when the difference value belongs to the error range, considering that the actual radius of the emergent light beam is equal to the input radius and meets the requirement; when the difference does not fall within the error range, the actual radius of the outgoing beam may be considered to be unequal to the input radius, which is undesirable.
When the actual radius of the outgoing beam meets the requirements, the smaller the absolute value of the difference between the actual radius and the input radius, the closer the actual radius is to the input radius, i.e. the desired value. By selecting the actual distance corresponding to the actual radius at which the absolute value of the difference is smallest, the outgoing beam closest to or identical to the desired value can be obtained. Furthermore, a difference curve can be manufactured according to the real-time difference, so that the data analysis and other related work of workers are facilitated.
When the actual distance between the adjusting lenses exceeds the adjusting range, no matter the difference between the actual radius of the light beam and the input radius does not belong to the error range, the currently used Galileo beam expander is considered to have defects or problems in process or other aspects.
The distance between the lenses cannot be used as a standard for measuring the working state of the galilean beam expander, and when the difference between the actual radius and the theoretical radius of the emergent beam exceeds the error range, the working state of the galilean beam expander is not in the normal range no matter how the difference between the actual distance and the theoretical distance of the lenses.
FIG. 2 illustrates a block diagram of an apparatus for verifying the pitch of lenses in a Galileo beam expander according to one embodiment of the present invention. The method comprises the following steps:
the input module 11: inputting an outgoing beam radius, the outgoing beam radius being a desired value;
the data processing module 12: calculating to obtain the theoretical distance of the lens according to the checking rule;
the adjusting module 13: adjusting the actual spacing of the lenses by a controller according to the theoretical spacing;
the comparison detection module 14: and comparing and detecting whether the actual radius of the emitted light beam meets the requirement.
As a preferred embodiment, referring to fig. 3, the data processing unit includes:
the parameter entry unit 121: inputting fixed parameters in the verification rule;
data temporary storage unit 122: temporarily storing the recorded fixed parameters;
the calculation processing unit 123: and processing the data according to the calculation mode of the check rule.
Referring to fig. 4, as a preferred embodiment, the adjusting module includes:
the floating adjustment unit 131: adjusting the actual spacing of the lenses within the adjustment range by a controller;
the first detection unit 132: detecting the actual radius of the emergent beam;
the second detection unit 133: detecting an actual pitch of the lenses;
the record holding unit 134: the actual spacing corresponding to the actual radius of the emergent beam is recorded.
Referring to fig. 5, as a preferred embodiment, the comparison detection module includes:
the difference value calculation unit 141: calculating the difference between the actual radius and the input radius;
the floating detection unit 142: and detecting whether the difference value falls within the error range.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Those of ordinary skill in the art will understand that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, although the present invention is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is possible to modify the solutions described in the above embodiments or to substitute some or all of the technical features of the embodiments, without departing from the scope of the present invention as defined in the claims.
Claims (9)
1. A method for verifying a lens pitch in a galilean beam expander, comprising:
inputting an emergent beam radius, wherein the emergent beam radius is the beam radius acting on the surface of an object after passing through a Galileo beam expander;
calculating to obtain the theoretical distance of the lens according to the checking rule;
adjusting the actual spacing of the lenses by a controller according to the theoretical spacing;
comparing and detecting whether the actual radius of the emergent light beam meets the requirement;
the calculation method of the check rule comprises the following steps:
wherein the content of the first and second substances,
c1 is the radius of incident light, unit mm, fixed parameter;
f1 is the focal length of the first lens of the Galileo beam expander, unit mm, fixed parameter;
f2 is the focal length of the second lens of the Galileo beam expander, unit mm, and fixed parameters;
f is a fixed parameter of the distance between the surface of the action object and the first lens of the Galileo beam expander, unit mm;
c2 is the radius of the beam acting on the surface of the object after passing through the Galileo beam expander, unit mm, input radius, i.e. the desired value;
d is the distance between the first lens of the Galileo beam expander and the second lens of the Galileo beam expander, and the unit mm is a theoretical spacing value.
2. The method of claim 1, further comprising, prior to calculating the theoretical lens separation according to the verification rule:
inputting fixed parameters in a check rule calculation mode;
temporarily storing the fixed parameters until the next recording;
and after the radius of the emergent light beam is input, calculating a theoretical spacing value according to the temporarily stored fixed parameters through a checking rule.
3. The method of claim 1, wherein adjusting the actual pitch of the lens comprises:
presetting an adjustment range (d-rho, d + rho), wherein d is a theoretical spacing value and a rho error allowable value;
adjusting the actual spacing of the lenses within the adjustment range by a controller;
detecting the actual radius of the emergent beam and the actual distance between the lenses;
the actual spacing corresponding to the actual radius of the emergent beam is recorded.
4. The method according to claim 3, wherein the step of comparatively detecting whether the actual radius of the outgoing light beam meets the requirements comprises:
the allowable error range is preset to be within a predetermined range,
calculating the difference between the actual radius and the input radius;
and if the difference is detected to be within the error range, the actual radius meets the requirement.
5. The method of claim 4, wherein when the actual radius meets the requirement:
the smaller the absolute value of the difference, the closer the actual radius is to the input radius;
and selecting the actual distance corresponding to the actual radius when the absolute value of the difference is minimum so as to obtain the optimal emergent light beam.
6. An apparatus for verifying a lens pitch in a galilean beam expander, comprising:
the input module is used for inputting the radius of an emergent beam, wherein the radius of the emergent beam is the radius of the beam acting on the surface of an object after passing through the Galileo beam expander;
the data processing module is used for calculating the theoretical distance of the lenses according to the checking rule;
the adjusting module adjusts the actual distance of the lenses through the controller according to the theoretical distance;
the comparison detection module is used for comparing and detecting whether the actual radius of the emitted light beam meets the requirement or not;
the calculation method of the check rule comprises the following steps:
wherein the content of the first and second substances,
c1 is the radius of incident light, unit mm, fixed parameter;
f1 is the focal length of the first lens of the Galileo beam expander, unit mm, fixed parameter;
f2 is the focal length of the second lens of the Galileo beam expander, unit mm, and fixed parameters;
f is a fixed parameter of the distance between the surface of the action object and the first lens of the Galileo beam expander, unit mm;
c2 is the radius of the beam acting on the surface of the object after passing through the Galileo beam expander, unit mm, input radius, i.e. the desired value;
d is the distance between the first lens of the Galileo beam expander and the second lens of the Galileo beam expander, and the unit mm is a theoretical spacing value.
7. The apparatus of claim 6, wherein the data processing module comprises:
the parameter input unit is used for inputting fixed parameters in the verification rule;
the data temporary storage unit is used for temporarily storing the recorded fixed parameters;
and the calculation processing unit is used for processing the data according to the calculation mode of the check rule.
8. The apparatus of claim 6, wherein the adjustment module comprises:
a floating adjustment unit for adjusting the actual distance between the lenses within the adjustment range by the controller;
a first detection unit that detects an actual radius of the outgoing beam;
a second detection unit that detects an actual pitch of the lenses;
and the recording and storing unit is used for recording the actual distance corresponding to the actual radius of the emergent light beam.
9. The apparatus of claim 6, wherein the contrast detection module comprises:
a difference value calculating unit calculating a difference value between the actual radius and the input radius;
and the floating detection unit detects whether the difference value falls within the error range.
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| WO2015027152A1 (en) * | 2013-08-22 | 2015-02-26 | Thorlabs, Inc. | Beam expander using two power-adjustable lenses |
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| CN207132126U (en) * | 2017-09-14 | 2018-03-23 | 成都安的光电科技有限公司 | Target illumination device based on semiconductor laser |
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| CN101148002A (en) * | 2007-10-26 | 2008-03-26 | 江苏大学 | Laser micro processor optical focus system |
| WO2015027152A1 (en) * | 2013-08-22 | 2015-02-26 | Thorlabs, Inc. | Beam expander using two power-adjustable lenses |
| CN104423048A (en) * | 2013-08-30 | 2015-03-18 | 大族激光科技产业集团股份有限公司 | Infrared laser fixed-multiplying power beam expander and infrared laser fixed-multiplying power beam expanding device |
| CN104330864A (en) * | 2014-11-18 | 2015-02-04 | 中国工程物理研究院应用电子学研究所 | Slab laser beam expanding alignment system capable of adjusting in electric closed loop mode |
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