WO2007129363A1 - レーザ発振器並びに該レーザ発振器の電源装置並びに該レーザ発振器の制御方法 - Google Patents
レーザ発振器並びに該レーザ発振器の電源装置並びに該レーザ発振器の制御方法 Download PDFInfo
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
-
- 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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
-
- 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
- H01S3/1305—Feedback control systems
-
- 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
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1312—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
-
- 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
- H01S3/0014—Monitoring arrangements not otherwise provided for
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
Definitions
- LASER OSCILLATOR POWER SUPPLY DEVICE FOR THE LASER OSCILLATOR, AND METHOD FOR CONTROLLING THE LASER OSCILLATOR
- the present invention relates to protection of optical components and the like of a laser oscillator.
- an upper limit current value corresponding to the rated current value of an excitation means for example, a lamp or a laser diode
- an excitation means for example, a lamp or a laser diode
- Patent Document 1 Japanese Patent Application Laid-Open No. 63-250883 (Claims)
- the current upper limit value is set.
- the current upper limit value is set according to the rated current value of the excitation means, for example, the laser diode
- the upper limit value is set regardless of the magnitude of the laser output command value. Instead, current is supplied to the excitation means up to a fixed current upper limit. For this reason, as described above, when optical components are contaminated and the output is reduced. In this case, the energy loss in the optical component becomes large, and there is a possibility that the damage will eventually lead to the replacement of the component.
- the output of the emitted laser light is measured, the measured laser output value is compared with a desired laser output command value, and the laser corresponding to the laser output command value is compared.
- a laser oscillator that performs feedback control to supply current to an excitation unit that excites a laser medium so that an output is obtained, and an upper limit current value that limits current supply by feedback control to the excitation unit is Current upper limit setting means for setting according to the laser output command value; and current limiting means for limiting the current supply by the feedback control to be equal to or lower than the current upper limit value set by the current upper limit setting means. It is provided.
- the current upper limit value for limiting the current supply to the excitation means is set by the laser output command value, thereby increasing the energization current to the excitation means, that is, preventing the increase in the input energy. It is possible to suppress energy loss in optical parts, and to prevent the occurrence of damage to V and dripping when replacing parts.
- FIG. 1 is a configuration diagram of a laser processing apparatus using a laser oscillator showing Embodiment 1 of the present invention.
- FIG. 2 is a configuration diagram of a laser oscillator showing the first embodiment of the invention.
- FIG. 3 is a table showing characteristics of laser diodes.
- FIG. 4 is a diagram illustrating the setting of the current upper limit value of the laser oscillator according to the first embodiment of the present invention.
- FIG. 5 is a configuration diagram of a current upper limit setting unit of the laser oscillator according to the first embodiment of the present invention.
- FIG. 6 is a table showing an example of setting the current upper limit value of the laser oscillator according to the first embodiment of the present invention.
- FIG. 7 is a configuration diagram of a laser oscillator showing an embodiment 3 of the invention.
- FIG. 8 is a configuration diagram of the current upper limit setting unit of the laser oscillator according to the fourth embodiment of the present invention.
- ⁇ 9] is a flowchart for explaining the operation of the laser oscillator according to the fourth embodiment of the present invention.
- ⁇ 10] Another configuration diagram of the current upper limit setting unit of the laser oscillator according to the fourth embodiment of the present invention. is there.
- a configuration diagram of a comparator of the laser oscillator according to the sixth embodiment of the present invention 14] A configuration diagram of a comparator of the laser oscillator according to the sixth embodiment of the present invention. 15] A flow chart for explaining the operation of the laser oscillator according to the sixth embodiment of the present invention.
- FIG. 16 is a graph for explaining temporal changes in the laser output and the like of the laser oscillator according to the sixth embodiment of the present invention.
- FIG. 17 is a configuration diagram of a laser output determination unit of the laser oscillator according to the seventh embodiment of the present invention.
- ⁇ 18 This is a graph for explaining temporal changes in the laser output and the like of the laser oscillator according to the seventh embodiment of the present invention.
- FIG. 1 is a configuration diagram of a laser processing apparatus using a laser oscillator in Embodiment 1 for carrying out the present invention.
- a direct current supplied from the power supply 10 is passed through the laser diode 1 to excite the laser medium 2 with the pumping light 15 obtained by emitting the laser diode 1, and resonance occurs between the total reflection mirror 3 and the partial reflection mirror 4.
- the laser beam 16 is obtained.
- the laser beam obtained in this way is magnified and collimated using the magnifying lens 5 and the parallel lens 6 to obtain an optical fiber.
- the light is incident on the end face of the optical fiber 8 by the fiber incident lens 7.
- the condensed laser beam passes through the optical fiber 8 and is guided to a predetermined position through the processing head 9.
- the laser output is measured by making a part of the laser light incident on the power monitor 13 by the partial reflection mirror 14.
- the laser output can be adjusted by changing the current supplied to the laser diode 1.
- a desired laser output command set value is given from an external control device 17 to the power supply device 10 that supplies current to the laser diode 1, and the current supplied to the laser diode 1 is controlled by the power supply device 10.
- FIG. 2 is a configuration diagram of the laser oscillator according to the first embodiment for carrying out the present invention, and particularly illustrates the inside of the power supply device 10.
- the voltage input from the external voltage source 20 is converted into direct current by the rectifying unit 21 and charged to the capacitor 22.
- the transistor 23 When the transistor 23 is turned on, a current starts to flow to the laser diode 1 through the rear tuttle 24. While the transistor 23 is on, the current flowing through the laser diode 1 increases, so if the current exceeds the desired current value, the transistor 23 is turned off and the current is returned to the diode 25 to decrease the current. Let On the contrary, when the current becomes smaller than the desired current, the transistor 23 is turned on to increase the current. By repeating this on and off, the current is controlled to a desired current value.
- the current value flowing in the laser diode 1 is measured by the current sensor 26 and taken into the current control device 27.
- the first comparator 28 sends an ON signal of, for example, 5 V to turn on the transistor 23 to the drive circuit 29 of the transistor 23. If the current measurement is higher than the reference current, the first comparator 28 sends an off signal, eg OV, to the drive circuit 29 of the transistor 23 to turn off the transistor 23.
- the drive circuit 29 of the transistor 23 Based on the ON / OFF command of the transistor 23 sent from the first comparator 28 in this way, the drive circuit 29 of the transistor 23 performs the current and voltage required to actually turn on / off the transistor 23. Is supplied to the transistor 23, and the transistor 23 is turned on and off. By these operations, the current value flowing through the laser diode 1 is changed to the reference current value. It is controlled so that
- the current command value when the current command value and the current upper limit value are input to the second comparator 30 and the current command value is lower than the current upper limit value, the current command value is used as the reference current value in the first stage of the next stage. If the current command value is higher than the current upper limit value, the current upper limit value is output as the reference current value to the first comparator 28 in the next stage. That is, the reference current value is limited to be equal to or lower than the current upper limit value.
- the current command value is set in the current command value setting unit 31 shown in FIG.
- Laser output command set values such as output set values directly input by the operator and output set values on the machining program are converted from the controller 17 as digital values or voltage converted values (for example, corresponding to 4000 W commands at 5 V)
- the current command value setting unit 31 is input.
- the laser output measurement value measured by the power monitor 13 is also input to the current command value setting unit 31 as a digital value or a voltage conversion value.
- a current command value necessary for making the laser output measurement value the same as the laser output command setting value is calculated.
- the current command value to be supplied to the excitation unit can be calculated based on the laser output change data with respect to the current value change.
- the current upper limit value As shown in FIG. 2, the laser output command set value is also input to the current upper limit value setting unit 32. In the current upper limit setting section 32, the current upper limit value is set according to the input laser output command set value.
- the excitation output of the laser diode is laser Exceeding the threshold current, which is the minimum current required for oscillation, causes the excitation output to increase almost linearly as the current increases, and the relationship between current I and excitation output w is
- Al and B1 are constants.
- the relationship between the laser output of the laser oscillator and the pump output of the laser diode exceeds the threshold output because the laser output increases almost linearly as the pump output increases. Can be approximated as follows.
- Constants A and B can be obtained if the values of Al, A2, Bl, and B2 are known. To obtain the values of Al, A2, B1, and B2, measure the pump output when the laser diode current is changed, and approximate it using Equation 1. Similarly, the relationship between the pump output and the laser output is approximated by Equation 2. By these approximations, the values of Al, A2, Bl, and B2 are obtained, and constants A and B are obtained.
- FIG. 3 is a table showing the values of the excitation output with respect to the energization current value of the laser diode 1 and representing the characteristics of the laser diode. It is assumed that the worst laser diode used has the output characteristics shown in Fig. 3 (a) and the best one has the characteristics shown in Fig. 3 (b). .
- A2 and B2 can be obtained in the same way using the values for the best and worst characteristics of the oscillator. It is desirable to obtain these values under conditions where the optical components are not contaminated V, such as the initial state of the laser oscillator and the state after maintenance. By determining the current upper limit value using this state as a reference state, it is possible to effectively prevent an increase in current value due to contamination of optical components.
- equation 4 is plotted in the graph with the horizontal axis as the laser output and the vertical axis as the current value, the solid line in Fig. 4 is obtained.
- the laser output is considered as the laser output command set value
- the current value necessary to obtain the laser output command set value is divided.
- the increase in the force current value that sets the current upper limit value based on FIG. 4 is not limited to the decrease in output due to contamination of optical parts, etc. Also affected by.
- the current upper limit value must be set to the required current value obtained from Equation 4 taking into account changes in the current value due to changes in the cooling water temperature of the excitation means and changes in the outside air temperature.
- the influence varies depending on the configuration of the excitation means and the laser oscillator, but when a laser diode is used, the cooling water temperature of the excitation means is controlled relatively rigorously, and the influence is low, but the output power
- the stability is about ⁇ 2 to 3%. When the output varies ⁇ 2 to 3%, the current also varies ⁇ 2 to 3%.
- the current upper limit value needs to account for 2 to 3% of the necessary current value obtained from Equation 4. For example, if the current value required to obtain the output is 50A, the upper limit current value must be 51 to 51.5A.
- the current upper limit value set in this way is represented by the broken line A in FIG. In the vicinity of the maximum laser output, the slope of the broken line A is 0. This is to prevent the current value from exceeding the current upper limit value that is limited by the rated current value of the excitation means.
- the current upper limit value is a value obtained by adding 2A to the required current value obtained from Equation 4.
- the current upper limit value set in this way is represented by a broken line B in FIG. Force of broken line B
- the current value becomes the current upper limit value, and there is a high possibility that the output will not be output. Therefore, when high output is mainly used, the current upper limit value may be set based on the broken line A in FIG. 4, and when high output is not used much, the current upper limit value may be set based on the broken line B. .
- the calculation of the current upper limit value is performed as follows.
- FIG. 5 is an internal configuration diagram of the current upper limit setting unit 32. As shown in FIG.
- a storage unit 35 is provided in the current upper limit value setting unit 32, and the slope and Y intercept of the current upper limit value A or B in FIG. 4 are calculated in advance and stored in the storage unit 35. Keep it. Then, in the current upper limit calculation unit 36 configured by a microcomputer or the like in the current upper limit setting unit 32, the slope and Y intercept data stored in the storage unit 35 and the laser output command setting input from the control device 17 are set. Based on the value, the current upper limit value is calculated.
- the current upper limit value obtained by the current upper limit value setting unit 32 and the current command value set by the current command value setting unit 31 are input to the second comparator 30.
- the current command value is output as the reference current value, and feedback control is performed so that the laser output becomes the command set value based on this reference current value.
- the optical component is contaminated and the output is reduced, the current is limited so that the current value required to obtain the laser output of the laser output command set value is only a few A or more.
- the upper limit value is output as the reference current value. Since the current supply to the excitation means is feedback-controlled based on this reference current value, the current supply is limited by the current upper limit value.
- a laser oscillator whose laser output changes with the current applied to the excitation means, the upper limit of the current is shown in Fig. 6 (b) based on the broken line A in Fig. 4.
- the settings are as follows. In this case, if the laser output was 2000 W, and the current value rose to the upper limit current due to contamination of the optical components, the increase in current value can be suppressed to 2A.
- the worst current of 70A is input and the current value rises to 20A.
- the energy corresponding to the increase in the current value is the one that was input to make up for the energy absorbed by the dirt on the optical components.
- the 1W output increases for laser diodes with the characteristics shown in Fig. 3 (a).
- a high-power laser oscillator uses several hundred laser diodes, and if it rises by 2A, it means that hundreds of watts of energy is absorbed by dirty optical components.
- optical components used in the oscillator will not develop until the fatal damage resulting from the replacement of the optical components if the heat generated is several hundred watts.
- the worst thousands of watts of energy are absorbed by dirty optical components, and there is a high possibility that the replacement of optical components will lead to catastrophic damage.
- the laser diode is described as an example of the excitation means.
- the approximate expressions of Expressions 1 and 2 are different.
- the storage unit 35 stores the slope of the relational expression between the laser output command value and the current upper limit value and the data of the Y intercept.
- This slope and Y-intercept are the forces determined by the data forces in Fig. 6 (a) and Fig. 6 (b) .
- the storage unit 35 stores the data in Fig. 6 (a) and Fig. 6 (b), Based on the data, the current upper limit value corresponding to the laser output command set value input in the current upper limit value calculation unit 36 may be selected or calculated.
- the relationship between the current value and the laser output is a discrete value. If the laser output command set value is exactly the value described in the storage unit 35, the current value at that time is You can read it out, but if the value is in the middle of the data, use the current value at the minimum laser output that exceeds the laser output command set value.
- the minimum laser output exceeding 1800 W that is, a current value of 50 A at 2000 W may be selected as the current value.
- the current value may be obtained by linear approximation between discrete values.
- the current value force OA when the laser output is 1500W and the current value when the power is 2000W is 50A so these two points can be linearly approximated, and the current value at 1800W may be as follows.
- the current value may be obtained by linear approximation between discrete values.
- the current value at a laser output of 150 OW is 42A, and the current value at 2000W is 52A. Therefore, a linear approximation between these two points may be used, and the current value at 1800W may be as follows.
- the current value obtained by the current upper limit calculator 36 is the upper limit current value itself. Therefore, this value may be output as the upper limit current value.
- the laser oscillator according to the present embodiment has the above-described configuration, so In other words, the measured value or current upper limit value can be directly written in the storage unit without the need to separately calculate the relational expression between the laser output value and the upper limit current value. This has the effect of preventing the malfunction of the laser oscillator due to the erroneous calculation of.
- the laser oscillator in the first or second embodiment is configured to control the current flowing through the laser diode so that a desired laser output is obtained. However, if the current value input to the laser diode is changed, the laser oscillator power The mode of the output laser light will change. For processing that does not require relatively high accuracy, or for the type that transmits laser light using an optical fiber as in Embodiment 1, the change in the mode of the laser light is not a problem. When a special processing is required, a change in the mode of the laser beam becomes a problem.
- the present embodiment provides a laser oscillator that can also be applied to processing that is problematic in changing the mode of laser light.
- FIG. 7 is a configuration diagram of the laser oscillator according to the present embodiment.
- the same components as those of the laser oscillator according to the first embodiment shown in FIG. 2 are given the same reference numerals, and detailed description thereof is omitted. Hereinafter, parts different from FIG. 2 will be described.
- the control device 17 outputs a current command set value and a current upper limit set value.
- a signal switch 40 is provided in the current control device 27 in the power supply device 10.
- the current command value from the current command value setting unit 31 and the current upper limit value from the current upper value setting unit 32 are directly input to the first comparator 28.
- the signal switcher 40 switches between the current command value from the current command value setting unit 31 and the current command set value from the control device 17, and the current from the current limit value setting unit 32.
- a signal is input to the second comparator 30 by switching between the upper limit value and the current upper limit set value from the control device 17. Switching of the signal switcher 40 is controlled by the control device 17. In FIG.
- the current command set value and the current upper limit set value from the control device 17 are input to the second comparator 30. It becomes.
- the current flowing through the laser diode 1 is controlled to be a current command set value that does not depend on the laser output measurement value, that is, the current value is constant.
- the current upper limit set value may be set to a current value corresponding to the rated current value of the laser diode, as in the prior art.
- the laser oscillator according to the present embodiment has the above-described configuration, so that the mode change of the laser beam does not become a problem.
- the same operation as the laser oscillator according to the first embodiment A similar effect can be obtained.
- constant current control can be performed, it can be applied to processing in which the mode change of the laser beam is a problem, and the applicable processing range is wider than the laser oscillator according to the first embodiment.
- the versatility is improved. Further, by applying this configuration to other embodiments, similar effects can be obtained in other embodiments.
- the laser oscillator according to the first embodiment is measured in advance with reference to the optical state where the optical component is contaminated in advance, preferably the initial state of the laser oscillator or the state after maintenance. Based on the value of the measured current value and the laser output value, the slope and Y intercept of the equation for obtaining the current upper limit value from the laser output are calculated and stored in the storage unit 35.
- the laser oscillator has a configuration in which the values of the current value and the laser output value measured in advance are stored in the storage unit 35 as they are or after being converted into a current upper limit value.
- the laser oscillator measures the data for setting the current upper limit value according to an operator's instruction or the like based on the state before using the laser oscillator for actual processing as a reference state.
- the overall configuration of the laser oscillator is substantially the same as that in FIG. 7 of the third embodiment, and the current upper limit value setting unit 32 and the control device 17 are different. Therefore, the current upper limit value setting unit will be described below.
- FIG. 8 is a configuration diagram of the current upper limit setting unit 32 of the present embodiment.
- the laser output measurement value when the current command value is changed is measured, and the relationship between the current value supplied to the laser diode 1 and the laser output is obtained. This relationship is acquired according to the flow shown in FIG. 9 in the current value 'laser output value measuring unit 45 in FIG.
- the operation will be described with reference to FIG. 8 and FIG.
- control device 17 When an operator or the like gives an instruction to the control device to set the current upper limit value, the control device 17 first switches the signal switcher 40 to the position of the solid line in FIG. Thereby, the current value is controlled by the current command set value output from the control device 17.
- control device 17 sets the current command set value to OA (step SOO).
- control device 17 sends an acquisition start signal and a current command set value to the current value'laser output value measuring unit 45 (step S01).
- the current value 'laser output value measurement unit 45 Upon receiving the acquisition start signal, the current value 'laser output value measurement unit 45 reads the laser output measurement value (step S02).
- the current value / laser output value measurement unit 45 writes the combination of the current command set value sent from the control device 17 and the read laser output measurement value in the storage unit 35 (step S03).
- control device 17 increases the current command set value by a predetermined value (step S04). Then, the control device 17 checks whether the force at which the current command setting has reached the current upper limit value (step S05).
- step S01 If the upper limit value has not been reached, the process returns to step S01, and the combination of the current set value and the laser output measurement value is sequentially written in the storage unit 35 by performing step S01, step SO2, and step S03 again. .
- This operation is repeated, and when the current command setting reaches the current upper limit value setting in step S05, the operation for acquiring the relationship between the current value and the laser output is terminated.
- the relationship between the current setting value and the laser output measurement value can be obtained, For example, data as shown in FIG. In the above, the same data can be obtained even if the current measurement value from the force / current sensor, which is assumed to input the current command set value to the current value / laser output value measurement unit 45, is input.
- the current value 'laser output value measurement unit 45 converts the current command set value sent from the control device 17 into a current upper limit value and stores it in the storage unit 35. ) Is stored in the storage unit 35.
- the current value is set to the current command set value at the laser output value measurement unit 45.
- the current value (2A in the case of FIG. 4) is added and stored in the storage unit 35 as the upper limit current value.
- the upper limit current value is set as shown by the broken line B in Fig.
- step S04 when the increase amount of the current command value in step S04 is set small, the measurement accuracy is improved, but it takes time until the current value reaches the upper limit. The measurement is completed quickly, but the measurement accuracy will be relatively poor, so it is necessary to set it appropriately depending on the accuracy or time deviation.
- the control device 17 switches the signal switch 40 to the position of the broken line in FIG. 7, and the laser oscillator is set according to the laser output command set value output from the control device 17.
- the same effect as in the second embodiment can be obtained by controlling the laser output data stored in the storage unit 35 as shown in FIG. 6 (a) and FIG. 6 (b).
- the storage amount of the storage unit 35 that can be stored in the storage unit 35 as a relational expression between the laser output and the current upper limit value can be reduced.
- the configuration of the current upper limit setting unit 32 is as shown in FIG. In FIG.
- the combination data of the current command set value from the laser output value measurement unit 45 and the laser output measurement value is input to the relational expression calculation unit 50, and the calculation is performed in the relational expression calculation unit 50.
- a relational expression between the laser output and the current upper limit value is obtained.
- the obtained relational expression Write the slope and Y intercept to the memory unit 35.
- the relational expression may be obtained in the relational expression calculation unit 50 from a value obtained by adding a constant value to the current command set value and the laser output value.
- the amount of current increase with respect to the laser output is preliminarily expressed as a primary expression and stored in the relational expression calculation unit 50.
- the laser output measurement force is also used to determine the amount of current increase.
- the increase amount is added to the current command set value, and the relational expression between the value and the laser output power can be obtained.
- the relational expression calculation unit 50 writes the slope and Y intercept of the obtained relational expression in the storage unit 35.
- the same data as in the first embodiment is written in the storage unit 35. Therefore, when actually used for a cache or the like, the signal switch 40 is set to the position of the dotted line in FIG. Then, the oscillator may be operated by the same control as in the first embodiment.
- the laser oscillator measures the data for setting the current upper limit value, and has means for setting the current upper limit value based on the measured data. Since the data to be stored in 35 is created and stored, it is possible to improve the labor saving of the oscillator setting work.
- the timing that the operator or the like instructs is the timing for writing data to the storage unit 35, that is, the timing for selecting the reference state of the laser oscillator for setting the current upper limit value.
- Writing may be performed regularly, or after the laser was introduced at the beginning of the laser oscillator, the current increased to the upper limit of the current, and the optical components were cleaned, etc. Please implement it as appropriate.
- the current command set value is changed by the control device 17, and the laser output at that time is measured and stored in the control device 17, for example.
- the measured value of the previous laser output The amount of change in the current laser output measurement value is calculated.
- a signal is output to the outside as normal if the amount of change is below a certain value and abnormal if it is above a certain value.
- a method of defining a constant value there is a method of estimating using the deterioration amount of the excitation means and the time interval between the previous measurement and the current measurement. For example, if the time-dependent degradation of the excitation means is reduced by 20% in 10,000 hours, that is, the output obtained as a laser is also reduced by 20%, and the interval between the previous measurement time and the current measurement time is 1000 hours. For example, if the laser output changes by 2%, it can be regarded as normal, and if it is more than that, it can be regarded as abnormal.
- the functions of the storage unit 35, current upper limit value calculation unit 36, current value'laser output value measurement unit 45, and relational expression calculation unit 50 that have been described so far may be calculated by independent microcomputers or the like. However, these functions can be processed in a single microcomputer. Also, the current control device 27 and the control device 17 may be configured integrally by a microcomputer or the like!
- the excitation means deteriorates with time even in a normal state, in order to keep the laser output constant even if the optical components and the like are normal, increase the energization current over time. There must be. For this reason, even if the optical components and the like are normal, the energization current force current upper limit value to the excitation means may be reached. In the present embodiment, the current upper limit value is changed according to the temporal deterioration of the excitation means.
- FIG. 11 is a configuration diagram of the laser oscillator according to the present embodiment
- FIG. 12 is an internal configuration diagram of the current upper limit value setting unit of the laser oscillator according to the present embodiment.
- 2 and 5 of the first embodiment are that a current energization determining unit 55 and an energization signal integration timer 56 are added, and that the current upper limit setting rate 25 has a current upper limit relaxation rate calculation unit 57. Is added.
- the current command value output from the current command value setting unit 31 is input to the current conduction determination unit 55 and compared with the current of OA. If the current command value is greater than OA, Assuming that power is being supplied, an energization signal is sent to the energization signal integration timer 56.
- the energization signal integration timer 56 integrates the time during which the energization signal is on and outputs the time (energization time) to the current upper limit setting unit 32 at all times.
- the energization signal integration timer 37 stores the energization integration time at that time, and when the power is turned on again, the energization signal is further added to the stored energization integration time. By accumulating the time when is on, the cumulative energization time from the beginning can be calculated.
- the storage unit 35 stores relational data between the conduction time of the current flowing to the excitation means and the relaxation rate of the current upper limit value as shown in FIG.
- the value of the force relaxation rate which is data when 20% performance deteriorates due to the use of the excitation means force S10000 hours, is appropriately determined depending on the excitation means used.
- the current upper limit relaxation rate calculation unit 57 reads the data on the relationship between the energization time and the relaxation rate as shown in FIG. 13 stored in the storage unit 35, and is input from the energization signal integration timer 56. The current upper limit relaxation rate is calculated and sent to the current upper limit calculation unit 36.
- the relaxation rate is multiplied by the current upper limit value to set the current upper limit value in consideration of the energization time.
- the current upper limit relaxation rate data may take discrete values as shown in FIG. In this case, the current upper limit relaxation rate may be obtained by using the current upper limit relaxation rate at the minimum energization time exceeding the energization time or by linearly approximating between discrete values.
- the current upper limit relaxation rate is set in Fig. 13
- the laser output command set value is 2000 W when the current duration is 3,000 hours.
- the minimum energization time that exceeds the energization time is 4000 hours.
- the current upper limit relaxation rate calculation unit 57 calculates the current upper limit relaxation rate as 1.08.
- the calculated current upper limit relaxation rate is sent to the current upper limit calculator 36.
- the laser output command set value is 2000 W
- the current upper limit value when the current upper limit relaxation rate is not taken into consideration is calculated as 52 A from the current upper limit calculation unit 36 (b) of FIG.
- the current upper limit relaxation rate 1.08 sent from the current upper limit relaxation rate calculation unit 57 is multiplied by the current upper limit value 52A, thereby taking into account deterioration with time of the excitation means.
- the current upper limit values are as follows.
- the current upper limit relaxation rate is 1.04 at 2000 hours and 1.08 at 4000 hours, so the current upper limit relaxation rate when the energization time is 3000 hours is based on the data in the memory unit 35.
- the mitigation rate calculation unit 56 calculates as follows.
- the calculated current upper limit relaxation rate is sent to the current upper limit calculator 36.
- the current upper limit value is obtained by multiplying the current upper limit value 52A, which also obtains the data power of the storage unit 35, by the current upper limit value calculation unit 36 and the relaxation rate 1.06 sent from the current upper limit relaxation rate calculation unit 28. It is as follows.
- the discrete value data of the relaxation rate stored in the storage unit 35 is used.
- the energization time and the deterioration rate of the excitation means can be expressed by an approximate expression. For example, when the excitation amount of the excitation means is reduced by 20% at 10,000 hours of energization time, the current upper limit relaxation rate is
- This relational expression 5 is stored in the current upper limit relaxation rate calculation unit 57, and the current upper limit relaxation rate calculation unit 57 calculates the current upper limit relaxation rate from the energization time of the input excitation means.
- the upper limit relaxation rate may be sent to the current upper limit value calculation unit 36, and the current upper limit value may be obtained by the same calculation as described above.
- the relational expression may be stored in the storage unit 35.
- the degree of deterioration of the excitation means is affected by the energization time.
- the degree of deterioration of the excitation means is affected by the number of times the excitation means is energized (number of on / off times). May be used as an indicator of deterioration by replacing the energization time described above with the number of times of energization (number of on / off times).
- the present embodiment includes means for detecting this abnormality.
- FIG. 14 is an internal configuration diagram of the second comparator 30 of the laser oscillator according to the present embodiment, and other configurations are the same as those of the above-described embodiment.
- the current command value confirmation unit 60 receives the current command value when the current command value is lower than the current upper value as described in the first embodiment. Is output to the first comparator 28 in the next stage, and conversely, if the current command value is higher than the current upper limit value, the current upper limit value is output to the first comparator 28 in the next stage. The If the current command value is higher than the current upper limit value, the current upper limit value is output to the first comparator 28 at the next stage, and at the same time, the upper limit value output signal is output from the upper limit value output time detection timer 61. Sent to.
- FIG. 15 is a flowchart for explaining the operation of the second comparator 30. The operation of the second comparator 30 will be described in detail based on FIG.
- the upper limit value output time detection timer 61 confirms the force with which the upper limit value output signal is output from the current command value confirmation unit 60 (step S61).
- the upper limit value output time detection timer 61 checks whether or not the elapsed time is being measured (step S62).
- the upper limit value output time detection timer 61 checks whether or not the elapsed time has passed a predetermined time (step S63).
- the upper limit value output time detection timer 61 outputs an abnormality signal to the control device 17.
- step S62 If it is determined in step S62 that the measurement has not been performed, the upper limit value output time detection timer 61 starts measuring the elapsed time (step S65). Then, the process is performed again from step S61.
- step S61 If no signal is output in step S61, the upper limit value output time detection timer 61 Confirms whether the elapsed time is being measured (step S66).
- step S63 the upper limit value output time detection timer 61 ends the measurement of the elapsed time. Then, the process is performed again from step S61.
- step S66 If it is determined in step S66 that the measurement has not been performed, the process is performed again from step S61.
- the upper limit value output detection timer 61 measures the time during which the upper limit value output signal is continuously on, and when the ON time exceeds a certain time, The signal is notified to the control device 17.
- the laser output command value may be set to OW, and the laser oscillator may be controlled to stop the oscillation.
- Fig. 16 (a) is a graph of time variation of the laser output, etc. when normal
- Fig. 16 (b) is a graph when abnormal, as shown in Fig. 16 (a) when the laser oscillator is normal.
- the rise of the laser output reacts with a delay in response to changes in current due to the influence of the thermal time constant of the laser oscillator and the rise time constant of the power monitor. Therefore, in the case of laser output constant control, the current value increases to the upper limit current value at the start of laser output. After that, when the laser output approaches the desired value, the current command value gradually decreases and settles to a certain value.
- the upper limit value output signal is not output when the current command value becomes equal to or lower than the current upper limit value.
- the slope of the graph becomes gentle before the laser output reaches the desired output.
- the difference between the target value and the current value is calculated, and when the output approaches the target value and the difference decreases, the current is controlled to decrease. It is to do.
- the desired laser output cannot be obtained even if the current at the upper limit current is passed. The time you spend is longer.
- the upper limit output signal is also continuously output. If the upper limit output signal continues to be output for a certain time or more, there is an abnormality in the optical components. The abnormality is notified to the outside. This fixed time may be appropriately determined in consideration of the thermal time constant of the laser oscillator and the rise time constant of the power monitor, and a time longer than that time constant.
- the control device stops the operation of the laser oscillator due to the abnormal signal, so that, for example, damage to the optical component or the like can be prevented.
- the time when the current value is the upper limit current command is measured, and the force that confirms the presence or absence of abnormality is detected. This is to notify the outside of the abnormality.
- FIG. 17 is an internal configuration diagram of the laser output determination unit 65 of the laser oscillator according to the present embodiment, and is provided inside or outside the current control device 27. Other configurations are the same as those in the above-described embodiment.
- the laser output determination unit 65 receives the laser output command set value and the laser output measurement value.
- the laser output command set value and the laser output measurement value that have been input are confirmed by the laser output confirmation unit 66 in the laser output determination unit 65 whether the laser output measurement value has reached the lower limit value corresponding to the laser output command set value. Determine.
- This lower limit value is 2 to 3% lower than the laser output command set value, considering that the laser output power varies about ⁇ 2 to 3% due to the influence of cooling water and outside temperature as described above. For 2000W, set it to 1940W, which is 3% lower. If the laser output confirmation unit 66 determines that the laser output has reached the lower limit, it outputs a signal within the laser output range. In addition, the laser output confirmation unit 66 outputs a timer start signal when the laser output command set value changes.
- the laser output range signal and the timer start signal are input to the abnormality detection timer 67.
- the abnormality detection timer 67 starts counting the timer simultaneously with the input of the timer start signal. After the timer count is started by the error detection timer 67, if a signal within the laser output range is input after a certain time, it is determined that there is no error and the timer count is stopped. On the other hand, if a signal within the laser output range is not input even after a certain time has elapsed, it is determined that there is an abnormality, and the abnormality detection timer 67 outputs an abnormality signal to the control device 17. Where constant Considering the thermal time constant of the oscillator and the rise time constant of the power monitor, the time should be appropriately determined by the time longer than that time constant.
- FIG. Fig. 18 (a) is a graph of time variation of the laser output, etc. when normal
- Fig. 18 (b) is a graph when abnormal, as shown in Fig. 18 (a).
- the detection timer 67 starts counting the timer, and the laser output range signal turns on within a certain time.
- the timer count starts and the laser output range signal does not turn on within a certain time.
- an abnormality is output to the external control device as an abnormality.
- the signal is output when the laser output reaches the lower limit value. Conversely, the signal may be output when the laser output is less than the lower limit value. In this case, if the signal does not turn off within a certain time after the timer starts counting, it can be determined as abnormal.
- the laser oscillator according to the present invention is processed so that the change in the mode of the laser light output from the laser oscillator hardly causes a problem as in the case of transmitting the laser light through an optical fiber. It is particularly suitable for use in the force field where there are many opportunities to change the output of the laser beam.
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Abstract
Description
Claims
Priority Applications (5)
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JP2008514313A JP4803254B2 (ja) | 2006-04-25 | 2006-04-25 | レーザ発振器並びに該レーザ発振器の電源装置並びに該レーザ発振器の制御方法 |
CN2006800543834A CN101427429B (zh) | 2006-04-25 | 2006-04-25 | 激光振荡器及其电源装置、该激光振荡器的控制方法 |
DE112006003867T DE112006003867B4 (de) | 2006-04-25 | 2006-04-25 | Laseroszillatorvorrichtung, Energieversorgungsvorrichtung und zugeordnetes Steuerungsverfahren |
PCT/JP2006/308602 WO2007129363A1 (ja) | 2006-04-25 | 2006-04-25 | レーザ発振器並びに該レーザ発振器の電源装置並びに該レーザ発振器の制御方法 |
US12/282,811 US7889772B2 (en) | 2006-04-25 | 2006-04-25 | Laser oscillator apparatus and power supply apparatus therefor, and control method therefor |
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PCT/JP2006/308602 WO2007129363A1 (ja) | 2006-04-25 | 2006-04-25 | レーザ発振器並びに該レーザ発振器の電源装置並びに該レーザ発振器の制御方法 |
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US (1) | US7889772B2 (ja) |
JP (1) | JP4803254B2 (ja) |
CN (1) | CN101427429B (ja) |
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WO (1) | WO2007129363A1 (ja) |
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JP2010525604A (ja) * | 2008-01-18 | 2010-07-22 | オープンベース カンパニーリミテッド | 波長可変装置及びその方法 |
JP2010212549A (ja) * | 2009-03-12 | 2010-09-24 | Panasonic Corp | レーザ発振装置およびレーザ加工機 |
JP2012079966A (ja) * | 2010-10-04 | 2012-04-19 | Miyachi Technos Corp | ファイバレーザ加工装置及び励起用レーザダイオード電源装置 |
JP2012084630A (ja) * | 2010-10-08 | 2012-04-26 | Miyachi Technos Corp | ファイバレーザ加工装置及び励起用レーザダイオード電源装置 |
JP2014187279A (ja) * | 2013-03-25 | 2014-10-02 | Fujikura Ltd | 光増幅装置における出力光パワー低下の判定方法及び光増幅システム |
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JP2022041129A (ja) * | 2020-08-31 | 2022-03-11 | 三菱電機株式会社 | ガスレーザ装置 |
JP7333772B2 (ja) | 2020-08-31 | 2023-08-25 | 三菱電機株式会社 | ガスレーザ装置 |
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Also Published As
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US20090207871A1 (en) | 2009-08-20 |
CN101427429B (zh) | 2013-07-10 |
DE112006003867T5 (de) | 2009-04-02 |
JP4803254B2 (ja) | 2011-10-26 |
DE112006003867B4 (de) | 2012-01-26 |
JPWO2007129363A1 (ja) | 2009-09-17 |
US7889772B2 (en) | 2011-02-15 |
CN101427429A (zh) | 2009-05-06 |
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