KR101855744B1 - Realtime Temperature Control Laser System - Google Patents
Realtime Temperature Control Laser System Download PDFInfo
- Publication number
- KR101855744B1 KR101855744B1 KR1020150145791A KR20150145791A KR101855744B1 KR 101855744 B1 KR101855744 B1 KR 101855744B1 KR 1020150145791 A KR1020150145791 A KR 1020150145791A KR 20150145791 A KR20150145791 A KR 20150145791A KR 101855744 B1 KR101855744 B1 KR 101855744B1
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- South Korea
- Prior art keywords
- laser
- unit
- light
- transmitted
- temperature
- Prior art date
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- 230000005855 radiation Effects 0.000 claims abstract description 66
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 230000003247 decreasing effect Effects 0.000 claims abstract 2
- 238000005259 measurement Methods 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000004093 laser heating Methods 0.000 claims 5
- 230000001678 irradiating effect Effects 0.000 claims 3
- 230000002452 interceptive effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Abstract
A first focusing lens 20 for focusing a laser beam emitted from the light emitting unit 10 at an input end of the transfer unit 40, a second focusing lens 20 for focusing a laser beam emitted from the light emitting unit 10 at an input end of the transfer unit 40, A transmission part 40 through an optical fiber or a reflection mirror for transmitting the laser transmitted from the light emitting part 10 and a laser output from the output part 40b of the transmission part 40, A second focusing lens 50 for focusing the first focusing lens 30 and the transfer unit 40 and a second laser unit 50 for positioning the first focusing lens 30 and the transfer unit 40, A band pass mirror 110 for reflecting the light to be transmitted in a direction crossing the laser path, and a light amount measuring unit 130 for detecting light in the range of 1.6 to 2.4 μm reflected from the band pass mirror 110, A photodiode 120 for transmitting the light from the photodiode 120 to the photodiode 120, A thermal radiation amount measuring unit 130 for generating a temperature measurement value T1 related to the temperature of the workpiece and a temperature measurement value T1 transmitted from the thermal radiation amount measuring unit 130, And a control unit (140) for transmitting a control signal (S1) to the power supply unit (20) in a direction of decreasing the difference value by comparing with the control signal .
Description
The present invention relates to a radiation temperature interlocking type laser device capable of real time temperature control.
A conventional laser system is a system in which a laser output is controlled by an electric current to control the current adjustment internally or externally, and is output in a continuous or pulsed manner. Therefore, the output of the laser, which is one of the optimized working processes of the work material, is determined in the laser using process. The operator must check the state of the laser before the process, set the output of the laser according to the machining conditions, and perform the measurement after the measurement through the power meter from outside. In case of laser, different output may appear even if the same current is used depending on the usage time and working environment, and when the use time is lengthened, the laser output naturally lowers. Therefore, the operator of the laser machine has to check and adjust the laser output before each work.
In order to measure the radiation temperature separately from the laser and the optical system in the prior art, it is necessary to correct the radiation temperature separately in a situation where it is difficult to accurately measure the temperature due to existence of the heating surface and the oblique line. The use of a separate radiation temperature measuring device in addition to the laser optical system takes up a lot of installation space and increases the installation cost due to an increase in the number of component parts. There is a problem that a work process for matching the focus and the measurement position of the laser is additionally required.
In the present invention, when the laser is operated using heat, a phenomenon that the laser output instantly changes at the time of initial output is severely manifested, and the output fluctuation and the worker's mistake cause a product failure. In order to solve such a problem It is an object of the present invention to realize a system for measuring the radiation temperature of a workpiece after laser emergence so as to make the laser output constant.
A
A
A first focusing
A
A second focusing
The light is transmitted through the laser and is transmitted through the
A
A thermal radiation
The temperature measurement value Tl transmitted from the thermal radiation
And,
The
Coaxial configuration through the optical fiber and laser emission and coaxial measurement using the developed coaxial optical system have the following advantages as they measure the same position on the same area and the same plane as the actual heating surface.
- It is not necessary for the operator to adjust the laser output by controlling the laser output by measuring the temperature generated by the emitted laser in a noncontact manner.
- For equipment using this system, the programmer of the process program does not have to program the laser output change part.
- In case of moving during laser emission, if the speed is automatically lowered according to the conveying speed, the power of the laser is reduced. If the conveying speed is faster, the power of the laser is increased and the workpiece temperature is prevented from being changed. As far as possible, there is no need for separate laser power adjustment.
- Unlike the contactless temperature measurement, which is measured in the diagonal direction, the position and intensity correction for the temperature measurement is not necessary because of the coaxial measurement of the temperature measurement.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a radiation temperature interlocking type laser apparatus according to a first embodiment of the present invention. FIG.
FIG. 2 is a schematic diagram of a radiation temperature interlocking type laser apparatus capable of real time temperature control according to a second embodiment of the present invention. FIG.
FIG. 3 is a schematic diagram of a radiation temperature interlocking type laser apparatus capable of real time temperature control according to a third embodiment of the present invention.
Hereinafter, a radiation temperature interlocking type laser apparatus capable of real time temperature control according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a radiation temperature interlocking type laser apparatus capable of real time temperature control according to a first embodiment of the present invention, FIG. 2 is a radiation temperature interlocking type laser apparatus capable of real time temperature control according to the second embodiment of the present invention, 3 is a radiation temperature interlocking type laser device capable of real time temperature control according to the third embodiment of the present invention.
As shown in FIG. 1, a radiation temperature interlocking type laser device capable of real-time temperature control according to a first embodiment of the present invention includes a
1, the present invention includes a
As shown in FIG. 2, a radiation temperature interlocking type laser device capable of real-time temperature control according to a second embodiment of the present invention includes a
2, the band-
As shown in FIG. 3, the radiation temperature-coupled laser apparatus capable of real-time temperature control according to the third embodiment of the present invention includes a
A first focusing
3, the first band-
3, the
As shown, the direction crossing the laser path may be perpendicular to the laser path. In the first embodiment, a focal lens is further provided between the path of the band-
Using the wavelength range of 1.6μm ~ 2.4μm photodiode, the strength of the temperature radiation amount radiated from the workpiece heated by the laser is measured and the laser power is controlled by feedback control of the laser current with the set value. The laser wavelength band was applied to a laser system below the wavelength range of the photodiode, that is, 1.6 μm or less.
Measurement method of radiation temperature : See Fig. 4 (radiation characteristic table according to temperature)
- Using photodiode 1.6 ~ 2.4μm range
- the principle that the temperature radiation measured by the photodiode is proportional to the temperature of the workpiece
- Laser current control by measuring temperature radiation measured at photodiode
- Adjust laser drive current by measuring more than 500 temperature radiation data per second
- Radiation temperature measurement through coaxial optical system or optical fiber
Laser control using measured radiation temperature values
5 is a graph showing the relationship between the pre-control laser output temperature (green: set temperature, red: actual radiation temperature)
6 is a graph showing the relationship between the laser output temperature (green: set temperature, red: actual radiation temperature)
As a result of adjusting the current of the laser system by installing the radiation temperature measurement system coaxially, the temperature change due to the laser was remarkably lowered.
The function of the present invention will be described below.
(1) In the process of raising the temperature using the laser, the radiation temperature is measured using a high-speed photodiode, the temperature measurement data is fed back to the laser to control the laser driving current at a high speed, Method.
(2) We used a photodiode with a wavelength in the range of 1.6 ~ 2.4μm for the measurement of the radiation temperature, and the area which does not affect the laser wavelength and image was used.
(3) The measurement of the photodiode speed is 500Hz or more, and the laser current control system with the feedback speed of 500Hz or more is constituted.
(4) When measuring the radiation temperature, the focus lens of the laser optical system and a part of the laser optical system are simultaneously used for non-contact measurement.
(5) The laser emission, the radiation temperature measurement and the image system are coaxial.
(6) The laser irradiation position and the radiation temperature measurement position are made the same by using the optical fiber or the coaxial optical system when measuring the radiation temperature.
(7) In the structure of the coaxial optical system, laser emission, image and radiation temperature measurement are simultaneously performed.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but on the contrary, ≪ RTI ID = 0.0 > and / or < / RTI >
It is to be understood that the appended claims are intended to supplement the understanding of the invention and should not be construed as limiting the scope of the appended claims.
10: light emitting portion 20: power supply portion
30: First focusing lens
40:
50: second focusing lens
110, 210 and 310: a band pass mirror
120, 220, and 320: a photodiode
130, 230 and 330:
140, 240, 340: laser output control section
Claims (5)
A light emitting unit 10 for generating a laser to heat and melt a workpiece located in an outer region of the apparatus,
A power supply unit 20 for supplying power to the light emitting unit,
A first focusing lens 30 focusing the laser emitted from the light emitting unit 10 at an input end of the transfer unit 40,
A transmission unit 40 through an optical fiber or a reflection mirror for transmitting the laser transmitted from the light emitting unit 10,
A second focusing lens 50 for focusing the laser emitted from the output end 40b of the transfer unit 40 toward the workpiece,
The light is transmitted through the laser and is transmitted through the input port 40a of the transfer unit 40 to the optical path between the first focusing lens 30 and the transfer unit 40, A band pass mirror 110 for reflecting the light,
A photodiode 120 for sensing light in the range of 1.6 to 2.4 μm reflected by the bandpass mirror 110 and transmitting the light to the thermal radiation amount measuring unit 130,
A thermal radiation amount measuring unit 130 for generating a temperature measurement value T1 related to the temperature of the workpiece based on the light transmitted from the photodiode 120,
The temperature measurement value Tl transmitted from the thermal radiation amount measurement unit 130 is compared with the temperature setting value T0 inputted in advance and the direction of reducing the difference value is transmitted to the power supply unit 20 A laser output control unit 140,
And,
The laser diode 10 includes a power supply 20, a first focusing lens 30, a band pass mirror 110, a photodiode 120, a radiation amount measuring unit 130, a controller 140, The laser power supply unit 20 and the first focusing lens 30 are integrally formed by one package module 100,
The control unit 140 controls the temperature measurement value T 1 transmitted from the thermal radiation amount measurement unit 130 to a predetermined temperature value T 0 and a pre- A control signal S1 is transmitted to the power supply unit 20 in the direction of reducing the difference value and the laser light is irradiated from the workpiece heated by the laser using the photodiode 120 having a wavelength range of 1.6 to 2.4 μm The control unit 140 controls the laser current to be feedback controlled by the control unit 140 in conjunction with the radiation amount of the workpiece temperature so that the workpiece heated by the laser is excessively heated or excessively heated Wherein the temperature of the object to be heated is controlled so as not to be melted.
A light emitting unit 10 for generating a laser to heat and melt a workpiece located in an outer region of the apparatus,
A power supply unit 20 for supplying power to the light emitting unit,
A first focusing lens 30 focusing the laser emitted from the light emitting unit 10 at an input end of the transfer unit 40,
A transmission unit 40 through an optical fiber or a reflection mirror for transmitting the laser transmitted from the light emitting unit 10,
A second focusing lens 50 for focusing the laser emitted from the output end 40b of the transmission unit 40 toward the workpiece,
A band which is located in a path between the output end 40b of the transmission unit 40 and the second focusing lens 50 and reflects the light transmitted through the laser to be transmitted in a direction crossing the laser path, A pass mirror 210,
A photodiode 220 that senses light in the range of 1.6 to 2.4 μm reflected by the bandpass mirror 210 and transmits the light to the radiation amount measurement unit 230,
A thermal radiation amount measuring unit 230 for generating a temperature measurement value T1 related to the temperature of the workpiece based on the light transmitted from the photodiode 220,
The control unit 200 transmits a control signal S1 to the power supply unit 20 by comparing the temperature measurement value T1 transmitted from the thermal radiation amount measurement unit 230 with a preset temperature set value T0, A laser output control unit 240,
Lt; / RTI >
The control unit 240 controls the temperature measurement value T 1 transmitted from the thermal radiation amount measurement unit 230 to a predetermined temperature setting value T 0 and a pre- A control signal S1 is transmitted to the power supply unit 20 in a direction in which the difference value is decreased and a difference value is reduced in the workpiece heated by the laser using the photodiode 220 having a wavelength range of 1.6 mu m to 2.4 mu m The control unit 240 controls the laser current to be feedback controlled by the control unit 240 in conjunction with the radiation amount of the workpiece temperature so that the workpiece heated by the laser is excessively heated or excessively heated Wherein the temperature of the object to be heated is controlled so as not to be melted.
A light emitting unit 10 for generating a laser to heat and melt a workpiece located in an outer region of the apparatus,
A power supply unit 20 for supplying power to the light emitting unit 10,
A first focusing lens 30 focusing the laser emitted from the light emitting unit 10 at an input end of the transfer unit 40,
A transmission unit 40 through an optical fiber or a reflection mirror for transmitting the laser transmitted from the light emitting unit 10,
A second focusing lens 50 for focusing the laser emitted from the output end 40b of the transmission unit 40 toward the workpiece,
A first focusing lens 50 that is located on a path between the output end 40b of the transfer unit 40 and the second focusing lens 50 and reflects the transmitted light in a direction crossing the laser path, A band pass mirror 310,
A reflection mirror 350 for reflecting the light reflected by the first band pass mirror 310 in a direction parallel to the laser path,
A second band pass mirror 370 passing through the visible light region of the light reflected by the reflection mirror 350 and reflecting the light in the range of 1.6 to 2.4 μm in a direction crossing the laser path,
A camera 360 for picking up the light passing through the second bandpass mirror 370 after being reflected by the reflection mirror 350 and generating an image related to the workpiece,
A photodiode 320 for sensing the light in the range of 1.6 to 2.4 μm reflected by the second bandpass mirror 370 and transmitting the light to the radiation amount measuring unit 330,
A thermal radiation amount measuring unit 330 for generating a temperature measurement value T1 related to the temperature of the workpiece based on the light transmitted from the photodiode 320,
The control unit 400 transmits the control signal S1 to the power supply unit 20 by comparing the temperature measurement value T1 transmitted from the thermal radiation amount measurement unit 330 with a previously set temperature set value T0, A laser output control unit 340,
And,
The control unit 340 controls the temperature measurement value T 1 transmitted from the thermal radiation amount measurement unit 330 to a predetermined temperature value T 0 and a pre- A control signal S1 is transmitted to the power supply unit 20 in the direction of reducing the difference value and the laser light is irradiated from the workpiece heated by the laser using the photodiode 320 having a wavelength range of 1.6 to 2.4 μm The control unit 340 controls the laser current to be feedback controlled by the control unit 340 in conjunction with the radiation amount of the workpiece temperature so that the workpiece heated by the laser is excessively heated or excessively heated Wherein the temperature of the object to be heated is controlled so as not to be melted.
Wherein the direction of the laser beam is perpendicular to the laser path. The laser heating system according to claim 1,
A focus lens may be further provided between the path of the band-pass mirror 110 and the photodiode 120,
And a focus lens is further provided between the path of the band-pass mirror 210 and the photodiode 220. The real-time interfering type laser Heating device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150145791A KR101855744B1 (en) | 2015-10-20 | 2015-10-20 | Realtime Temperature Control Laser System |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150145791A KR101855744B1 (en) | 2015-10-20 | 2015-10-20 | Realtime Temperature Control Laser System |
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| Publication Number | Publication Date |
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| KR20170046210A KR20170046210A (en) | 2017-05-02 |
| KR101855744B1 true KR101855744B1 (en) | 2018-06-21 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001091548A (en) * | 1999-07-21 | 2001-04-06 | Ando Electric Co Ltd | Electro-optical probe |
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- 2015-10-20 KR KR1020150145791A patent/KR101855744B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001091548A (en) * | 1999-07-21 | 2001-04-06 | Ando Electric Co Ltd | Electro-optical probe |
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| KR20170046210A (en) | 2017-05-02 |
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