CN110672010B - Positioning device and automatic system based on laser self-mixing interference - Google Patents
Positioning device and automatic system based on laser self-mixing interference Download PDFInfo
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- CN110672010B CN110672010B CN201911047201.6A CN201911047201A CN110672010B CN 110672010 B CN110672010 B CN 110672010B CN 201911047201 A CN201911047201 A CN 201911047201A CN 110672010 B CN110672010 B CN 110672010B
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses a positioning device and an automatic system based on laser self-mixing interference, wherein the positioning device comprises: the device comprises a conduction unit, a positioning unit, a displacement detection unit and a photoelectric detection unit; the conduction unit is used for transmitting the object to be positioned to the positioning unit; the positioning unit comprises a first positioning block and a second positioning block which are arranged oppositely and can move oppositely; one side of the first positioning block, which is far away from the second positioning block, forms a reflecting structure; the displacement detection unit detects the position of an object to be positioned by utilizing light rays reflected by the reflection structure based on a laser self-mixing interference principle; the photoelectric detection unit is positioned at the outlet of the positioning unit and used for detecting the transmission condition of the object to be positioned by the positioning unit. Therefore, the positioning position of the object to be positioned can be detected in real time by utilizing the laser self-mixing interference principle, the accuracy and the automation of the lettering process are realized, and the production efficiency is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of laser application, in particular to a positioning device and an automatic system based on laser self-mixing interference.
Background
With the development of lettering technology, from the initial lettering on rotten wood to the lettering on stone, to the lettering or marking on metal surface nowadays; the partial lettering operation is for aesthetic appearance, and the partial lettering operation is for making the object to be lettered (i.e. the object to be positioned) have higher identification, so that some exclusive marks need to be engraved on the surface of the object to be positioned. When lettering is carried out on an object to be positioned made of any material, the positioning of the object to be positioned is extremely important, and the object to be positioned can be ensured not to be carved under the condition that the position of the object to be positioned is accurate and fixed, so that the appearance of the object is more attractive.
When the mobile phone waits for the positioning object to be engraved with characters, specific information needs to be engraved at the designated position (immediate printing position) of the object to be positioned. Because the marking position of the object to be positioned is fixed, and a vertical punching machine is usually adopted during marking, the position deviation of the object to be positioned and the situations of repeated marking, missing printing and the like are easy to occur in the processes of feeding, positioning and the like, and the positioning precision is poor and the production efficiency is low due to the adoption of manual positioning.
Disclosure of Invention
The embodiment of the invention provides a positioning device and an automatic system based on laser self-mixing interference, which are used for accurately positioning an object to be positioned, monitoring the position of the object in real time, and facilitating the realization of the accuracy and automation of a lettering process, thereby facilitating the improvement of positioning precision and production efficiency.
In a first aspect, an embodiment of the present invention provides a positioning device based on laser self-mixing interference, where the positioning device includes: the device comprises a conduction unit, a positioning unit, a displacement detection unit and a photoelectric detection unit;
the conduction unit is used for transmitting an object to be positioned to the positioning unit;
the positioning unit comprises a first positioning block and a second positioning block which are arranged oppositely and can move oppositely; a reflecting structure is formed on one side, away from the second positioning block, of the first positioning block;
the displacement detection unit detects the position of the object to be positioned by utilizing the light reflected by the reflection structure based on the laser self-mixing interference principle;
the photoelectric detection unit is positioned at the outlet of the positioning unit and used for detecting the transmission condition of the object to be positioned by the positioning unit.
In one embodiment, the reflective structure comprises a reflective sheet or a reflective film layer;
the reflector plate is attached to one side, facing the displacement detection unit, of the first positioning block; or
The reflective film layer is coated on one side, facing the displacement detection unit, of the first positioning block.
In one embodiment, the displacement detection unit comprises a self-mixing interference unit, a signal amplification unit and a data processing unit;
the self-mixing interference unit comprises a semiconductor laser, a micro lens and a photoelectric receiver, wherein the micro lens is positioned on a forward output light path of the semiconductor laser, and the photoelectric receiver is positioned on a backward output light path of the semiconductor laser; the semiconductor laser emits an initial light beam, the initial light beam irradiates the reflecting structure through the micro lens and is reflected by the reflecting structure to form a reflected light beam, and the reflected light beam is transmitted to the semiconductor laser along the reverse direction of the initial light beam and performs self-mixing interference with the initial light beam to form a feedback light beam; the photoelectric receiver receives the feedback light beam and converts the feedback light beam into an electric signal;
the signal amplifying unit is used for receiving and amplifying the electric signal;
the data processing unit is used for receiving and processing the electric signal amplified by the signal amplifying unit, determining the number of interference fringes according to the amplified electric signal, and determining that the object to be positioned is positioned accurately when the number of interference fringes is less than or equal to a preset value.
In one embodiment, the displacement detection unit further comprises a temperature monitor and a current controller;
the temperature monitor is used for monitoring and controlling the working temperature of the semiconductor laser within a preset working temperature range;
the current controller is used for determining the working current of the semiconductor laser according to the working temperature of the semiconductor laser.
In one embodiment, the positioning device further comprises an alarm unit, wherein the alarm unit is electrically connected with the data processing unit, or the alarm unit is embedded in the data processing unit;
the alarm unit is used for giving an alarm when the data processing unit determines that the number of the interference fringes is larger than the preset value; and/or
The alarm unit is used for giving an alarm when the photoelectric detection unit detects that the object to be positioned is abnormal in transmission.
In one embodiment, the conducting unit comprises a first guide plate, a second guide plate, a third guide plate and a material pushing rod;
the first guide plate and the second guide plate extend along a first direction, the third guide plate and the material pushing rod extend along a second direction, and the first direction is crossed with the second direction;
the first guide plate and the second guide plate are arranged oppositely to form a feeding channel; the third guide plate and one end part of the second guide plate form a middle channel, and the material pushing rod is telescopically arranged between the third guide plate and one end part of the first guide plate; the material pushing rod is used for pushing the object to be positioned, which is transmitted to the middle channel, to the positioning unit.
In an embodiment, the conducting unit further comprises at least two fourth guiding plates;
the extending direction of the fourth guide plates is parallel to the extending direction of the third guide plates, and the two fourth guide plates are oppositely arranged to form a discharging channel;
the feeding channel, the middle channel, the positioning area of the positioning unit, the detection area of the photoelectric detection unit and the discharging channel are communicated.
In an embodiment, a side of the first positioning block facing the second positioning block is formed into a convex structure along a direction facing the second positioning block, and a side of the second positioning block facing the first positioning block is formed into a concave structure along a direction departing from the first positioning block.
In one embodiment, the recessed structure is a V-shaped recess;
the value range of the opening angle A of the V-shaped recess is more than or equal to 120 degrees and less than or equal to 140 degrees.
In an embodiment, the photo detection unit comprises a photo switch.
In a second aspect, an embodiment of the present invention further provides an automation system, where the automation system includes any one of the positioning devices based on laser self-mixing interference provided in the first aspect.
The positioning device based on laser self-mixing interference provided by the embodiment of the invention comprises a conduction unit, a positioning unit, a displacement detection unit and a photoelectric detection unit; the transmission unit is used for transmitting the object to be positioned to the positioning unit; the positioning unit comprises a first positioning block and a second positioning block which are arranged oppositely and can move oppositely; one side of the first positioning block, which is far away from the second positioning block, forms a reflecting structure; the displacement detection unit detects the position of an object to be positioned by utilizing light rays reflected by the reflection structure based on a laser self-mixing interference principle; the photoelectric detection unit is positioned at the outlet of the positioning unit and used for detecting the transmission condition of the object to be positioned by the positioning unit, and the positioning position of the object to be positioned can be detected in real time based on the laser self-mixing interference principle, so that the accuracy and the automation of the lettering process are realized, the phenomena of lettering deviation, missing printing, reprinting and the like are effectively avoided, and the production efficiency is improved; meanwhile, the structure is simple, the operation is simple and convenient, the engraving precision is high, and the product quality is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a positioning device based on laser self-mixing interference according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a positioning unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a displacement detection unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The application of laser self-mixing interference technology in the field of precision measurement technology has been widely researched. After light output by the laser is reflected or scattered by an object (also referred to as an "object to be inscribed", "object to be positioned", "reflecting structure" or "target") moving outside, a part of the light is fed back to the inner cavity of the laser, the feedback light carries displacement information of the target, and after being mixed with light in the inner cavity, the output of the laser is modulated to form self-mixing interference. Subsequently, the self-mixing interference signal carrying the target motion information is subjected to data processing to realize the extraction of the target displacement information, so that the position of the target is positioned.
Taking the mobile phone as an example, the imprinter used for mobile phone lettering is generally a vertical punch, and during the lettering process, the mobile phone is placed on a punch, and characters on the die are imprinted at a designated position by physical stamping. Generally, a mobile phone is manually placed on a marking machine, and then a switch is started, so that marking position deviation can be caused; meanwhile, due to the vibration effect in the imprinting process, the position of the mobile phone is easy to deviate, so that the phenomenon of misprinting is caused.
In view of the above problems, an embodiment of the present invention provides a positioning device, which includes a conduction unit, a positioning unit, a displacement detection unit, and a photoelectric detection unit; the transmission unit is used for transmitting the object to be positioned to the positioning unit; the positioning unit comprises a first positioning block and a second positioning block which are arranged oppositely and can move oppositely; one side of the first positioning block, which is far away from the second positioning block, forms a reflecting structure; the displacement detection unit detects the position of an object to be positioned by utilizing light rays reflected by the reflection structure based on a laser self-mixing interference principle; the photoelectric detection unit is positioned at the outlet of the positioning unit and used for detecting the transmission condition of the object to be positioned by the positioning unit, and the positioning position of the object to be positioned can be detected in real time based on the laser self-mixing interference principle, so that the accuracy and the automation of the lettering process are realized, the phenomena of lettering deviation, missing printing, reprinting and the like are effectively avoided, and the production efficiency is improved; meanwhile, the structure is simple, the operation is simple and convenient, the engraving precision is high, and the product quality is ensured.
The following describes an exemplary positioning device provided by an embodiment of the present invention with reference to fig. 1 to 3.
Referring to fig. 1, in the positioning device 10, the conducting unit includes a first guiding plate 111, a second guiding plate 112, a third guiding plate 113 and a material pushing rod 140; the first guide plate 111 and the second guide plate 112 extend along a first direction X, the third guide plate 113 and the material pushing rod 140 extend along a second direction Y, and the first direction X is crossed with the second direction Y; the first guide plate 111 and the second guide plate 112 are oppositely arranged to form a feeding channel; the third guide plate 113 and one end of the second guide plate 112 form an intermediate channel, and the material pushing rod 140 is telescopically arranged between the third guide plate 113 and one end of the first guide plate 111; the pusher bar 140 is used to push the object 50 to be positioned, which is transferred to the intermediate passage, toward the positioning unit (in fig. 1, a positioning area of the positioning unit is defined by the first positioning block 121 and the second positioning block 122).
The object 50 to be positioned sequentially enters from the feeding channel, is transmitted to the middle channel along the feeding channel, and then is moved inwards by the material pushing rod 140, so that the object 50 to be positioned is pushed into the positioning area of the positioning unit.
Illustratively, the positioning device 10 further includes a bottom plate 180, and the first guide plate 111, the second guide plate 112, the third guide plate 113 and the pusher bar 140 in the conducting unit are fixed or movably fixed on the bottom plate 180.
For example, the first direction X and the second direction Y may be perpendicular, so that the middle channel and the feeding channel form a right-angled channel. The object 50 to be positioned sequentially passes through the feeding channel and then reaches the corner of the right-angle channel, and then the first object 50 to be positioned from the feeding channel is pushed to the positioning unit by combining the stretching of the material pushing rod 140, so that the object 50 to be positioned enters and is pushed.
In other embodiments, the included angle between the first direction X and the second direction Y may be set according to actual requirements of the positioning device 10, which is not limited in the embodiments of the present invention.
With continued reference to fig. 1, in one embodiment, the conduction unit further includes at least two fourth guide plates 114; the extending direction of the fourth guide plates 114 is parallel to the extending direction of the third guide plates 113, and the two fourth guide plates 114 are oppositely arranged to form a discharging channel; the feeding channel, the middle channel, the positioning area of the positioning unit, the detection area of the photoelectric detection unit and the discharging channel are communicated.
Thus, the object 50 to be positioned can be entered and guided out, and the assembly line operation, namely the automatic lettering process is realized.
It should be noted that fig. 1 only shows, by way of example, the size relationship of the guide plates in order from large to small: a first guide plate 111 (a second guide plate 112), a third guide plate 113, and a fourth guide plate 114. In other embodiments, the relative size of each guide plate can be set according to the actual requirements of the positioning device 10, which is not limited by the embodiment of the present invention.
In addition, the sizes of the feeding channel, the middle channel, the positioning area of the positioning unit, the detection area of the photoelectric detection unit and the discharging channel can be set according to the size of the object 50 to be positioned, so that the device can be adapted to different standards, and the device is convenient and fast to pass.
With continued reference to fig. 1 or fig. 2, in an embodiment of the positioning unit of the positioning device 10, a side of the first positioning block 121 facing the second positioning block 122 is formed into a convex structure along a direction facing the second positioning block 122, and a side of the second positioning block 122 facing the first positioning block 121 is formed into a concave structure along a direction departing from the first positioning block 121.
By such arrangement, the protruding structure and the recessed structure can be utilized to cooperate with each other, and the first positioning block 121 and the second positioning block 122 are combined to move relatively, so that the object 50 to be positioned can be fixed in the positioning area of the positioning unit, and the imprinting positioning of the object 50 to be positioned can be realized.
The specific shapes of the protruding structures and the recessed structures can be set according to the actual requirements of the positioning device 10, which is not limited in the embodiments of the present invention.
With continued reference to FIG. 2, in one embodiment, the recessed feature is a V-shaped recess; the value range of the opening angle A of the V-shaped recess is more than or equal to 120 degrees and less than or equal to 140 degrees.
With such an arrangement, the opening angle a can be set so that the opening angle is large enough, so that the object 50 to be positioned can conveniently enter the positioning area of the positioning unit; meanwhile, the opening angle A is not too large, so that the object 50 to be positioned can be prevented from sliding out of the positioning unit, namely, the object 50 to be positioned can be conveniently fixed in the positioning unit.
Illustratively, when the object 50 to be positioned is a mobile phone, a is 135 °. In other embodiments, the value of a may be set according to actual requirements of the positioning apparatus 10, which is not limited in the embodiment of the present invention.
For example, with continued reference to fig. 1 or 2, the positioning unit may further include a spring 123 connected to a side of the first positioning block 121 facing away from the second positioning block 122, a fixing sleeve 124 connected to the spring 123, and a fixing block 125 connected to the fixing sleeve 124. Thus, the first positioning block 121 can move relative to the second positioning block 122 by the extension and contraction of the spring 123.
Illustratively, with continued reference to fig. 1 or 2, the positioning unit may further include an adjustment plate 160 and an adjustment screw 170. Under the screwing-in or screwing-out adjusting effect of the adjusting screw 170, the two-dimensional position of the second positioning block 122 on the plane parallel to the bottom plate 180 can be controlled, so that the imprinting and positioning of the object 50 to be positioned are facilitated.
For example, the positioning unit is remotely located with reference to fig. 2. The protruding structure of the first positioning block 121 is set to be arc-shaped, when the object 50 to be positioned is extruded between the first positioning block 121 and the second positioning block 122 by the material pushing rod 140, under the action of the spring 123 fixed on the fixing block 125, the first positioning block 121 is retracted to a certain position in the direction away from the second positioning block 122, allowing the object 50 to be positioned to be pushed and fixed at the V-shaped recessed position of the second positioning block 122, so that the object to be positioned can be reliably fixed in the positioning area of the positioning unit.
With continued reference to fig. 1, in one embodiment, the reflective structure (not shown) includes a reflective sheet or film; the reflective sheet is attached to one side of the first positioning block 121 facing the displacement detecting unit (represented by 130); or the reflective film layer is coated on the side of the first positioning block 121 facing the displacement detecting unit.
For example, the reflective sheet may be a target mirror, or may be other types of reflective sheets known to those skilled in the art, and the embodiment of the invention is not limited thereto.
The reflectivity of the reflecting structure can be set according to actual requirements, and the reflecting structure only has the function of reflecting laser beams; the reflective structure may be a total reflective structure, a semi-reflective structure, or a reflective structure with other reflectivity values, which is not limited in the embodiment of the present invention.
The laser self-mixing interference has only one optical channel, and compared with the traditional laser interference, the laser self-mixing interference has the advantages of simple structure, easiness in collimation and the like.
Referring to fig. 1 and 3, in an embodiment, the displacement detection unit includes a self-mixing interference unit 130, a signal amplification unit 210, and a data processing unit 220; the self-mixing interference unit 130 comprises a semiconductor laser 131, a micro lens 132 and a photoelectric receiver 133, wherein the micro lens 132 is positioned on a forward output light path of the semiconductor laser 131, and the photoelectric receiver 133 is positioned on a backward output light path of the semiconductor laser 131; the semiconductor laser 131 emits an initial light beam 301, the initial light beam 301 irradiates the reflective structure 129 through the microlens 132 and is reflected by the reflective structure 129 to form a reflected light beam 302, the reflected light beam 302 is transmitted to the semiconductor laser 131 in the opposite direction of the initial light beam 301 and undergoes self-mixing interference with the initial light beam 301 to form a feedback light beam 303; the photo receiver 133 receives the feedback light beam 303 and converts the feedback light beam 303 into an electrical signal; the signal amplifying unit 210 is configured to receive and amplify the electrical signal; the data processing unit 220 is configured to receive and process the electrical signal amplified by the signal amplifying unit, determine the number of interference fringes according to the amplified electrical signal, and determine that the object 50 to be positioned is accurately positioned when the number of interference fringes is less than or equal to a preset value.
Wherein, the semiconductor laser 131 emits an initial light beam 301, which is irradiated onto the reflective structure 129 and reflected to form a reflected light beam 302; the reflected beam 302 is in line with the initial beam 301, the reflected beam 302 comprising reflected light and scattered light; the reflected beam 302 returns into the optical cavity of the semiconductor laser 131 creating an optical feedback effect that causes a change in the output power of the laser semiconductor 131 and hence the output optical power, creating a semiconductor laser self-mixing interference phenomenon, creating a feedback beam 303. The photoelectric receiver 133 is used for receiving the feedback light beam 303, converting the optical signal into an electrical signal, subsequently amplifying the electrical signal by the signal amplifying unit 210, receiving the amplified electrical signal by the data processing unit 220 for data analysis, counting by using a fringe counting method, obtaining the number of interference fringes in the feedback light beam 303, and determining whether the position of the first positioning block 121 is accurate according to the number of reflection fringes, thereby determining whether the position of the object 50 to be positioned is accurate. For this, a preset value is set, and when the number of interference fringes is less than or equal to the preset value, the position of the object 50 to be positioned is considered to be accurate; when the number of the interference fringes is larger than the preset value, the deviation of the object 50 to be positioned is considered to be larger, and the lettering operation is started after the adjustment is needed.
Illustratively, the preset value may be 2. Then when the count number is less than or equal to 2, it is deemed to be no problem, i.e. the position of the object 50 to be positioned is within an acceptable error range; when the counting value is larger than 2, the position of the object 50 to be positioned is inaccurate, an alarm can be given, an operator is prompted to readjust the position of the object 50 to be positioned, otherwise, lettering and positioning can be deviated, and attractiveness is affected.
In other embodiments, the preset value may be set according to the actual requirement of the positioning apparatus 10, and may be, for example, 1, 3 or other values, which is not limited in the embodiments of the present invention.
The Photo-receiver 133 may be a Photo-Diode (PD), or other Photo-conversion circuit components known to those skilled in the art, which is not limited in the embodiments of the present invention.
Illustratively, in the embodiment of the present invention, the self-mixing interference unit is arranged to include a semiconductor Laser (LD) 131, which is beneficial to reducing the overall volume, reducing the cost, and prolonging the service life.
In other embodiments, the laser may also be another type of laser, which may be set according to the actual requirement of the positioning device 10, and this is not limited by the embodiment of the present invention.
It should be noted that, since the initial beam 301 and the reflected beam 302 are in a straight line, the initial beam 301 and the reflected beam 302 are only shown in a solid line with double arrows in fig. 1, and are only distinguished by the arrow directions.
The micro lens 132 may be a converging lens, and is configured to converge as much light as possible in the light reflected or scattered by the reflection structure 129 into the semiconductor laser 131, so as to improve the signal-to-noise ratio, and further improve the positioning accuracy of the object 50 to be positioned.
For example, the micro lens 132 may be a single optical lens, or may be a lens group composed of a plurality of lenses, and may be configured according to actual requirements of the positioning apparatus 10, which is not limited in this embodiment of the invention.
In one embodiment, the micro-lens 132, the photoelectric receiver 133 and the semiconductor laser 131 may be integrated to reduce the number of components in the positioning device 10.
With continued reference to fig. 3, in one embodiment, the displacement sensing unit further includes a temperature monitor 134 and a current controller 135; the temperature monitor 134 is configured to monitor and control an operating temperature of the semiconductor laser 131 within a preset operating temperature range; the current controller 135 is used to determine the operating current of the semiconductor laser 131 based on the operating temperature of the semiconductor laser 131.
Therein, the semiconductor laser 131 is current driven using a current controller 135 to emit an initial (lasing) beam 301. Heat is generated in the working process, and the temperature of the semiconductor laser 131 rises along with the accumulation of the heat; the temperature of the semiconductor laser 131 affects the emission wavelength of the primary light beam 301, which causes measurement deviation. In this embodiment, by providing the temperature monitor 134 and the current controller 135, the semiconductor laser 131 can be driven normally, and the influence of the wavelength change on the measurement result can be avoided, so that the positioning accuracy of the object 50 to be positioned can be improved.
For example, the preset operating temperature range may be 25 ℃ to 28 ℃, or other optional temperature ranges known to those skilled in the art, and may be set according to actual requirements of the displacement detecting unit and the positioning device 10, which is not limited by the embodiment of the present invention.
In one embodiment, the signal amplification unit 210 includes a signal amplification circuit, and the data processing unit 220 includes a data acquisition card 221.
The signal amplification circuit is used for amplifying a tiny electric signal so as to facilitate subsequent data processing and improve the measurement precision. For example, the signal amplifying circuit may be disposed in a Printed Circuit Board (PCB).
The data processing unit 220 further includes a computer 222, and the data acquisition card 221 acquires data and transmits the data to the computer 222 for data processing.
Illustratively, the data acquisition card 221 may be an NI series acquisition card, which is convenient to carry, simple to use, drive-free to install, adjustable in acquisition resolution, and easy to acquire, and may be used in combination with Labview to enable the acquisition precision to be higher, thereby facilitating the improvement of the measurement precision.
In other embodiments, the data acquisition card 221 may also be other types of data acquisition cards known to those skilled in the art, and may be configured according to the actual requirements of the displacement detection unit and the positioning device 10, which is not limited in the embodiments of the present invention.
When the data collected by the NI collection card is processed by the PC end, denoising pretreatment is firstly carried out, and then displacement measurement is carried out by a fringe counting method.
In an embodiment, the PC terminal 222 performs denoising processing on the amplified electrical signal by using an Ensemble Empirical Mode Decomposition (EEMD) method to obtain a pure self-mixing interference signal, and then performs a fringe counting method to calculate the number of interference fringes.
In other embodiments, the ambient background noise may be subtracted in other manners known to those skilled in the art, and may be set according to the actual requirements of the positioning apparatus 10, which is not limited in the embodiments of the present invention.
In one embodiment, the positioning device 10 further includes an alarm unit 230, wherein the alarm unit 230 is electrically connected to the data processing unit 220, or the alarm unit 230 is embedded in the data processing unit 220; the alarm unit 170 is configured to send an alarm when the data processing unit 150 determines that the number of the interference fringes is greater than a preset value; and/or the alarm unit 230 is used for giving an alarm when the photoelectric detection unit detects that the transmission of the object 50 to be positioned is abnormal.
The preset value can also be understood as an allowable error range.
With such an arrangement, in the lettering process, the positioning device 10 can monitor the position of the object 50 to be positioned (i.e., the first positioning block 121) in real time, and when the position of the object 50 to be positioned is within the error allowable range, the lettering operation can be executed; when the displacement (or "position") of the object 50 to be positioned exceeds the maximum value of the allowable error range, which indicates that the marked position has a deviation, the alarm unit 230 immediately alarms to timely inform the staff to control the machine to stop working, so as to avoid further loss caused subsequently.
In an embodiment, the photo detection unit comprises a photo switch 150.
After the imprinter finishes one imprinting work, the material pushing rod 140 works once, the object 50 to be positioned firstly passes through the photoelectric switch 150 in front of the discharging channel formed by the fourth guide plate 114, and when the photoelectric switch 150 detects a signal, the imprinting condition is normal; if both signals or no signals are detected, a missing or reprint condition is indicated. At this time, the photoelectric switch 150 immediately notifies the machine to stop working, and prompts an alarm prompt to wait for the processing of the staff.
In one embodiment, the form of the alarm includes at least one of sounding, lighting, or displaying.
For example, the sound may be a buzzer sound or a droplet sound, the light may be yellow light or red light, and the picture may be a red warning picture with an exclamation mark; or the form of the alarm may be other forms known to those skilled in the art.
In this manner, the form of the alarm can be flexibly set according to the requirements of the positioning device 10.
The positioning device 10 based on laser self-mixing interference provided by the embodiment of the invention has the advantages of simple structure, convenience in operation and high automation degree, effectively improves the production efficiency, increases the engraving precision, ensures the product quality, and effectively avoids the phenomena of engraving deviation, missing and reprinting and the like.
On the basis of the above embodiments, the embodiment of the present invention further provides an automation system, which includes any one of the positioning devices based on laser self-mixing interference provided in the above embodiments. Therefore, the automation system also has the technical effects of the positioning device provided by the above embodiments, and can be understood by referring to the explanation of the positioning device in the foregoing, which is not described herein again.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A positioning device based on laser self-mixing interference is characterized by comprising: the device comprises a conduction unit, a positioning unit, a displacement detection unit and a photoelectric detection unit;
the conduction unit is used for transmitting an object to be positioned to the positioning unit;
the positioning unit comprises a first positioning block and a second positioning block which are arranged oppositely and can move oppositely; a reflecting structure is formed on one side, away from the second positioning block, of the first positioning block;
the displacement detection unit detects the position of the object to be positioned by utilizing the light reflected by the reflection structure based on the laser self-mixing interference principle;
the displacement detection unit comprises a self-mixing interference unit, a signal amplification unit and a data processing unit;
the self-mixing interference unit comprises a semiconductor laser, a micro lens and a photoelectric receiver, wherein the micro lens is positioned on a forward output light path of the semiconductor laser, and the photoelectric receiver is positioned on a backward output light path of the semiconductor laser; the semiconductor laser emits an initial light beam, the initial light beam irradiates the reflecting structure through the micro lens and is reflected by the reflecting structure to form a reflected light beam, and the reflected light beam is transmitted to the semiconductor laser along the reverse direction of the initial light beam and performs self-mixing interference with the initial light beam to form a feedback light beam; the photoelectric receiver receives the feedback light beam and converts the feedback light beam into an electric signal;
the signal amplifying unit is used for receiving and amplifying the electric signal;
the data processing unit is used for receiving and processing the electric signal amplified by the signal amplifying unit, determining the number of interference fringes according to the amplified electric signal, and determining that the object to be positioned is accurately positioned when the number of interference fringes is less than or equal to a preset value;
the photoelectric detection unit is positioned at the outlet of the positioning unit and used for detecting the transmission condition of the object to be positioned by the positioning unit.
2. The laser self-mixing interference based positioning device of claim 1, wherein: the reflective structure comprises a reflective sheet or a reflective film layer;
the reflector plate is attached to one side, facing the displacement detection unit, of the first positioning block; or
The reflective film layer is coated on one side, facing the displacement detection unit, of the first positioning block.
3. The laser self-mixing interference based positioning device according to claim 1, wherein the displacement detection unit further comprises a temperature monitor and a current controller;
the temperature monitor is used for monitoring and controlling the working temperature of the semiconductor laser within a preset working temperature range;
the current controller is used for determining the working current of the semiconductor laser according to the working temperature of the semiconductor laser.
4. The positioning device based on laser self-mixing interference according to claim 1, characterized by further comprising an alarm unit, wherein the alarm unit is electrically connected with the data processing unit or embedded in the data processing unit;
the alarm unit is used for giving an alarm when the data processing unit determines that the number of the interference fringes is larger than the preset value; and/or
The alarm unit is used for giving an alarm when the photoelectric detection unit detects that the object to be positioned is abnormally transmitted.
5. The laser self-mixing interference based positioning device according to claim 1, wherein the conduction unit comprises a first guide plate, a second guide plate, a third guide plate and a pusher bar;
the first guide plate and the second guide plate extend along a first direction, the third guide plate and the material pushing rod extend along a second direction, and the first direction is crossed with the second direction;
the first guide plate and the second guide plate are arranged oppositely to form a feeding channel; the third guide plate and one end part of the second guide plate form a middle channel, and the material pushing rod is telescopically arranged between the third guide plate and one end part of the first guide plate; the material pushing rod is used for pushing the object to be positioned, which is transmitted to the middle channel, to the positioning unit.
6. The laser self-mixing interference based positioning device according to claim 5, wherein the conduction unit further comprises at least two fourth guide plates;
the extending direction of the fourth guide plates is parallel to the extending direction of the third guide plates, and the two fourth guide plates are oppositely arranged to form a discharging channel;
the feeding channel, the middle channel, the positioning area of the positioning unit, the detection area of the photoelectric detection unit and the discharging channel are communicated.
7. The positioning device based on laser self-mixing interference according to claim 1, wherein one side of the first positioning block facing the second positioning block is formed into a convex structure along a direction facing the second positioning block, and one side of the second positioning block facing the first positioning block is formed into a concave structure along a direction departing from the first positioning block.
8. The laser self-mixing interference based positioning device according to claim 7, wherein the recessed structure is a V-shaped recess;
the value range of the opening angle A of the V-shaped recess is more than or equal to 120 degrees and less than or equal to 140 degrees.
9. An automated system comprising a laser self-mixing interference based calibration device positioning device according to any of claims 1-8.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10260008A (en) * | 1997-03-19 | 1998-09-29 | Nikon Corp | Stage device, coordinate measuring device, and position measuring method |
| CN201740513U (en) * | 2010-07-21 | 2011-02-09 | 杨克虎 | Modularized displacement measuring device with low cost |
| CN103115572A (en) * | 2013-01-23 | 2013-05-22 | 西南科技大学 | Connection joint micro-motion displacement measuring device and measuring method thereof |
| JP2015017943A (en) * | 2013-07-12 | 2015-01-29 | 太陽誘電株式会社 | Displacement measurement device and displacement measurement method |
| CN204694631U (en) * | 2015-05-04 | 2015-10-07 | 兴化市天派化妆品有限公司 | A kind of checkout equipment used for cosmetic |
| CN105947558A (en) * | 2016-06-22 | 2016-09-21 | 苏州赛腾精密电子股份有限公司 | Feeding conveyor device and magnetizer |
| CN205655802U (en) * | 2016-05-23 | 2016-10-19 | 深圳市宽田科技有限公司 | Detect equipment in car battery cap clearance |
| CN106999319A (en) * | 2014-12-15 | 2017-08-01 | 花王株式会社 | The manufacture method and manufacture device of piece fusion body |
-
2019
- 2019-10-30 CN CN201911047201.6A patent/CN110672010B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10260008A (en) * | 1997-03-19 | 1998-09-29 | Nikon Corp | Stage device, coordinate measuring device, and position measuring method |
| CN201740513U (en) * | 2010-07-21 | 2011-02-09 | 杨克虎 | Modularized displacement measuring device with low cost |
| CN103115572A (en) * | 2013-01-23 | 2013-05-22 | 西南科技大学 | Connection joint micro-motion displacement measuring device and measuring method thereof |
| JP2015017943A (en) * | 2013-07-12 | 2015-01-29 | 太陽誘電株式会社 | Displacement measurement device and displacement measurement method |
| CN106999319A (en) * | 2014-12-15 | 2017-08-01 | 花王株式会社 | The manufacture method and manufacture device of piece fusion body |
| CN204694631U (en) * | 2015-05-04 | 2015-10-07 | 兴化市天派化妆品有限公司 | A kind of checkout equipment used for cosmetic |
| CN205655802U (en) * | 2016-05-23 | 2016-10-19 | 深圳市宽田科技有限公司 | Detect equipment in car battery cap clearance |
| CN105947558A (en) * | 2016-06-22 | 2016-09-21 | 苏州赛腾精密电子股份有限公司 | Feeding conveyor device and magnetizer |
Non-Patent Citations (1)
| Title |
|---|
| 自混合干涉的振动位移重构算法及其;尹淑欣等;《化工自动化及仪表》;20180731;全文 * |
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