CN115548858A - Laser control method with multi-stage energy monitoring and energy correction functions - Google Patents
Laser control method with multi-stage energy monitoring and energy correction functions Download PDFInfo
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Abstract
The invention provides a laser control method with multi-stage energy monitoring and energy correcting functions, which comprises a laser energy control unit and a system control unit for carrying out drive control on a target laser based on a feedback signal of the laser energy control unit, and specifically comprises the following steps: performing multi-stage amplification on the acquired real-time light beam energy value of the incident laser of the target laser, and outputting energy deviation values of each monitoring position in the target laser under the current illumination intensity node; energy adjustment is carried out on the target laser to obtain stable output laser energy; and realizing fault positioning according to the energy deviation value of each monitoring position. The invention provides a real-time energy monitoring mode, when a photoelectric probe at a certain position in a laser monitors energy reduction and transmits an energy signal to an energy control system, the energy control system can adjust parameters in real time, thereby greatly reducing energy fluctuation of the laser and improving the stability of output energy.
Description
Technical Field
The invention relates to the technical field of laser energy correction control, in particular to a laser control method with multi-stage energy monitoring and energy correction functions.
Background
The high-energy solid laser with a main oscillation amplification (MOPA) structure has the characteristics of high beam quality and large energy, and has better application prospects in the fields of industry, medical treatment, scientific research and the like.
The seed source part of the laser can inject the laser with specific optical parameters into a multi-stage amplification system, and after multi-stage amplification, the laser energy of the seed source can be amplified to more than one thousand times and output on the premise of ensuring that important parameters such as wavelength, pulse width, beam quality and the like are not changed. And a movable frequency doubling module is added at the output position, so that multi-wavelength output can be realized.
However, the existing laser self structure is ubiquitous:
1. poor stability of output energy
The solid laser with the MOPA structure has a complex multi-stage amplification structure and comprises a frequency doubling module, light beams need to be amplified for multiple times in the laser, and the final output light beams of the laser are affected by the amplification effect of each stage. At present, the energy control of the laser is an open loop system, and the energy of each part in the laser cannot be monitored and adjusted in real time. Resulting in poor laser output stability.
2. Output energy attenuation
Many devices in such lasers suffer from the problem of efficiency degradation over long periods of use, and because the energy at each location cannot be monitored, the degraded devices cannot be located and parameters adjusted. Therefore, the output energy of the whole machine can be attenuated even if the whole machine is used for a long time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a laser control method with multi-stage energy monitoring and energy correction functions. To solve the problems posed in the background art described above.
In order to achieve the purpose, the invention is realized by the following technical scheme: the laser control method with the functions of multi-stage energy monitoring and energy correction is characterized in that: the method comprises the following steps:
laser energy control unit, and
the system control unit for performing drive control on the target laser based on the feedback signal of the laser energy control unit comprises the following steps:
performing multi-stage amplification on the acquired real-time beam energy value of the incident laser of the target laser, and outputting energy deviation values of each monitoring position in the target laser under the current illumination intensity node;
according to the real-time input laser energy deviation value of the seed source and the output laser energy deviation value, the pump source discharge voltage V in the target laser p Performing dynamic correction to adjust the energy of the target laser to obtain stable output laser energy;
and realizing fault positioning according to the energy deviation value of each monitoring position in the target laser.
As an improvement of the laser control method with the multi-stage energy monitoring and energy correcting functions in the present invention, a specific way to obtain the energy deviation value is as follows:
s1, constructing an energy monitoring function
S1-1, grading the real-time light beam energy value E of the node under the current illumination intensity, and determining energy value information (E) of each of n groups in the energy values formed after energy grading according to a curve fitted by the light beam energy value E of the photoelectric sensor corresponding to a reverse current value I of the photoelectric sensor n ，I n ) Wherein n is a positive integer representing the group, E n Representing the energy value of the beam of the nth group, I n Representing the reverse current value of the nth group;
s1-2, determining a set { E) of mapping relations between a light beam energy value E and a reverse current value I according to the energy value information of the n groups 0 ,E 1 ,…E n-1 };{I 0 ,I 1 ,…,I n-1 The photoelectric sensor is built inside the target laser energy control unit;
s1-3, establishing a mapping relation function of the light beam energy value E and the reverse current value I based on the acquired mapping relation set:
s2, establishing an energy deviation value formula of the target laser
In the formula (I), the compound is shown in the specification,
expressed as the energy deviation value of the real-time beam of the target laser;
the laser energy value is calculated after the system control unit receives a feedback signal of the target laser energy control unit;
indicating the laser energy value set by the system control unit;
s3, calculating laser energy deviation values of all monitoring positions, and substituting the laser energy deviation values into reverse current values collected by the photoelectric sensors at all monitoring positions
And obtaining the laser energy deviation value of the photoelectric sensor at each monitoring position.
As an improvement of the laser control method with multi-stage energy monitoring and energy correction functions described in the present invention,
the energy value of the monitoring position output by the seed source of the self-defined target laser is
，
Outputting an energy deviation value of the monitoring position for the target laser seed source,
the energy value set by the system control unit for the monitoring position output by the target laser seed source is obtained
According to the real-time input laser energy deviation value and the output laser energy deviation value of the seed source, the pumping current of the seed source in the target laser is measured
The specific implementation mode for dynamic correction is as follows:
when in use
Pumping current of seed source of target laser
Decreasing by 0.1 while the target laser continues to output energy into the photosensor; will be provided with
And
and (3) carrying out comparison:
if it is
≠
Then, continuously decrease
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when the temperature is higher than the set temperature
Pumping current of seed source
Increasing by 0.1, and simultaneously, continuously outputting energy to the photoelectric sensor by the laser; the seed source detected by the photoelectric sensor outputs an energy value in real time
And the default output energy value of the seed source
And (3) carrying out comparison:
if it is
≠
While continuing to increase
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when in use
And stopping automatic calibration.
As an improvement of the laser control method with multi-stage energy monitoring and energy correction functions described in the present invention,
the energy value of the input monitoring position of the self-defined target laser seed source is recorded as
，
Inputting an energy offset value for the monitored location for the target laser seed source,
inputting the energy value set by the system control unit of the monitoring position for the seed source of the target laser, then
According to the real-time input laser energy deviation value of the seed source, the discharge voltage V of the pumping source in the target laser p The specific implementation mode for dynamic correction is as follows:
when in use
And is made of
The laser energy control unit discharges the pumping source discharge voltage V in the target laser p The value is decreased by 10 while the target laser continues to output energy to the sensor in the laser energy control unit; energy detected by the sensor
And comparing with an energy value set by a system control unit: if it is
≠
When the Vp is not reduced, the Vp is reduced; if it is
=
When the adjustment is finished, stopping the adjustment;
when in use
And is and
the laser energy control unit discharges a pumping source discharge voltage V in the target laser p The value is increased by 10 while the target laser continues to output energy into the photosensor; energy detected by photoelectric sensor
And setting the energy
: if it is
≠
While continuing to increase V p (ii) a If it is
=
When the adjustment is finished, stopping the adjustment;
when in use
,
The laser energy control unit stops the energy adjustment.
As an improvement of the laser control method with multi-stage energy monitoring and energy correction functions in the present invention, a specific implementation manner of implementing fault location according to an energy deviation value of each monitoring position is as follows:
the energy value of each monitoring position of the self-defined target laser seed source is recorded as
，
The energy deviation values of the various monitored positions of the target laser seed source,
the energy values set for the system control unit at each monitored location of the target laser seed source, then,
target-based laser
，
When the temperature is higher than the set temperature
Judging that the reading is normal; otherwise, the reading is abnormal.
Further, in step S1-1, n is 10.
Compared with the prior art, the invention has the beneficial effects that:
1. in order to solve the problems that in the prior art, all parts in a laser are influenced by external factors such as temperature, humidity and vibration, the work is unstable, the energy of the laser cannot be monitored in real time in the prior art, and the energy fluctuation exists in the output energy of the laser, the invention provides a real-time energy monitoring mode, when a photoelectric probe at a certain position in the laser monitors energy reduction and transmits an energy signal to an energy control system, the energy control system can adjust parameters in real time, the energy fluctuation of the laser is greatly reduced, and the output energy stability is improved;
2. in order to solve the problems that in the prior art, the performance of internal devices is attenuated when a laser works at high intensity for a long time, and if no professional carries out manual calibration and debugging, the output energy of the laser is reduced, and the performance index of laser calibration cannot be reached, the invention provides a mode for constructing an energy detection and energy control system, and when the laser energy is reduced and the using effect is not good, a self-correcting program can be operated, the energy output characteristic of the current laser is compared with the output characteristic stored when leaving a factory, and calibration is carried out, so that the laser can output energy according to the calibrated parameters;
3. in order to solve the problems that in the prior art, when a laser fails to normally output light beams, the difficulty in locating fault points inside the laser is high, and the laser needs to be disassembled for maintenance, the invention effectively locates the fault points inside the laser by checking the energy values of all parts inside the laser, greatly improves the efficiency of after-sale maintenance, and reduces the maintenance cost.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention, in which like reference numerals are used to refer to like parts. Wherein:
fig. 1 is a schematic structural diagram of a system for data interaction between a laser energy control unit and a system control unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a real-time energy monitoring system according to an embodiment of the present invention;
FIG. 3 shows a discharge voltage V of a pump source in a target laser according to an embodiment of the present invention p Performing dynamic correction to realize a time sequence step flow schematic diagram of stable output laser energy of the target laser;
fig. 4 is a schematic flow chart of a timing sequence step for dynamically modifying the incident laser energy of the seed source to achieve stable output of the laser energy by the target laser according to an embodiment of the present invention.
Description of the reference numerals:
1 a-a first spectroscope, 1 b-a first photoelectric sensor, 2 a-a second spectroscope, 2 b-a second photoelectric sensor, 3 a-a third spectroscope, 3 b-a third photoelectric sensor, 4 a-a fourth spectroscope, 4 b-a fourth photoelectric sensor, 5 a-a fifth spectroscope, 5 b-a fifth photoelectric sensor, 6 a-a sixth spectroscope and 6 b-a sixth photoelectric sensor;
7-seed source, 8-isolator, 9-beam expanding lens group, 10-polarization beam splitter, 11-first laser crystal, 12-pumping source, 13-second laser crystal, 14-beam shaper, 15-second harmonic module, 16-polarization piece.
Detailed Description
It is easily understood that, according to the technical solution of the present invention, a person skilled in the art can propose various alternative structural modes and implementation modes without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings, but the present invention is not limited thereto.
As an understanding of the technical concept and the implementation principle of the present invention, in the prior art, a solid-state laser with a MOPA structure has a complicated multi-stage amplification structure and includes a frequency doubling module, light beams need to be amplified multiple times inside the laser, and the amplification effect of each stage affects the light beams finally output by the laser. At present, the energy control of the laser is an open-loop system, and the energy of each part in the laser cannot be monitored and adjusted in real time. Resulting in poor laser output stability.
Therefore, the technical conception is realized, and the defects of the prior technical scheme are overcome.
As an embodiment of the present invention, a laser control method with multi-stage energy monitoring and energy correction functions is provided, including:
the laser energy control unit is used for carrying out multistage amplification on the obtained incident laser of the target laser to obtain an energy deviation value output by the incident laser of the seed source under the current illumination intensity node; dynamically correcting the discharge voltage of a pumping source in the target laser according to the obtained energy deviation value so as to adjust the energy of the target laser and obtain stable output laser energy; and a system control unit for performing drive control on the seed source of the target laser based on the feedback signal of the received laser energy control unit.
As shown in fig. 1, based on the above technical concept, it should be noted that the specific implementation manner of the system control unit receiving the feedback signal of the laser energy control unit and outputting stable laser energy is as follows:
s1, constructing an energy monitoring function, wherein the working principle of a photoelectric sensor generally selects an indium gallium arsenide (InGaAs) photodiode (Photo Diode) is as follows: when a light beam with certain intensity irradiates on a treatment surface of the treatment surface, the reverse current is rapidly increased to dozens of microamperes, the reverse current value is in a direct proportion relation with the incident light energy, and the purpose of real-time energy detection is achieved by constructing a functional relation between the reverse current and the light beam energy reflected by the beam splitter, so that the specific idea of constructing an energy monitoring function is as follows:
respectively measuring the energy E of a light beam reflected by the spectroscope (the E represents laser energy in a corresponding relation formula of the laser energy and a sensor current signal, the energy of a part (such as a seed source) in the laser is not used, and the current signals of all sensors in the laser are converted into corresponding energy values by the formula in the general formula; the reverse current value I of the photodiode (photoelectric sensor) is that the light beam energy is from low to high, namely:
s1-1, grading the real-time light beam energy value E of the node under the current illumination intensity, and determining energy value information (E) of each of n groups in the energy values formed after energy grading according to a curve fitted by the light beam energy value E of the photoelectric sensor corresponding to a reverse current value I of the photoelectric sensor n ，I n ) Wherein n is a positive integer representing the group, E n Representing the energy value of the beam of the nth group, I n Representing the reverse current value of the nth group;
it should be noted that, the fitting curve of the light beam energy value E of the photoelectric sensor corresponding to the reverse current value I is formed by gradually increasing the light beam energy and measuring the reverse current of the corresponding photoelectric sensor, and the higher the accuracy is, the more times the measurement is required.
S1-2, determining a set { E) of mapping relations between a light beam energy value E and a reverse current value I according to the energy value information of the n groups 0 ,E 1 ,…E n-1 };{I 0 ,I 1 ,…,I n-1 The photoelectric sensor is built inside a target laser energy control unit;
s1-3, establishing a mapping relation function of the light beam energy value E and the reverse current value I based on the obtained mapping relation set:
it should be noted that, when the beam energy and the diode reverse current value conform to a strict linear function relationship, alternatively, a simple method may be used to construct the linear function, and the calculation method is as follows:
s2, establishing an energy deviation value formula of the target laser
In the formula (I), the compound is shown in the specification,
expressed as the energy deviation value of the real-time beam of the target laser;
the laser energy value is calculated after the system control unit receives a feedback signal of the target laser energy control unit;
indicating the laser energy value set by the system control unit;
s3, calculating the excitation of each monitoring positionLight energy deviation value, reverse current value collected by photoelectric sensor at each monitoring position
And substituting the formula (1) and the formula (3) to obtain the laser energy deviation value of each monitoring position.
As shown in FIG. 3, the energy value of the custom target laser seed source input monitoring position is recorded as
，
Inputting an energy offset value for the monitored location for the target laser seed source,
inputting the energy value set by the system control unit of the monitoring position for the target laser seed source, and calculating the deviation value in the following specific mode:
according to the real-time input laser energy deviation value of the seed source, the discharge voltage V of the pumping source in the target laser p The specific implementation mode for dynamic correction is as follows:
when the temperature is higher than the set temperature
And is made of
The laser energy control unit discharges the pumping source discharge voltage V in the target laser p The value is decreased by 10 while the target laser continues to output energy to the sensor in the laser energy control unit; energy detected by the sensor
And comparing with an energy value set by a system control unit: if it is
≠
When the signal is detected, vp is continuously reduced; if it is
=
When the adjustment is finished, stopping the adjustment;
when in use
And is made of
The laser energy control unit discharges a pumping source discharge voltage V in the target laser p The value is increased by 10 while the target laser continues to output energy into the photosensor; energy detected by photoelectric sensor
And setting the energy
: if it is
≠
While continuing to increase V p (ii) a If it is
=
When the adjustment is finished, stopping the adjustment;
when in use
,
The laser energy control unit stops the energy adjustment.
In an embodiment of the invention, after the mapping relation between the energy E and the reverse current value I of the incident laser is obtained based on the step S1, the energy value of the monitoring position output by the seed source of the target laser is customized to be
，
Outputting an energy deviation value of the monitored position for the target laser seed source,
an energy value set by a system control unit for outputting a monitoring position for a target laser seed source
The pumping current of the seed source in the target laser is also required to be adjusted according to the real-time output laser energy deviation value of the seed source
The dynamic correction is performed to dynamically correct the energy of the laser incident on the seed source, and it can be understood that the first photoelectric sensor 1b detects a current signal emitted by the energy of the seed source and brings the current signal into a corresponding relation between the laser energy and the sensor current signal to obtain the energy E, where the energy of the seed source Q = E. The specific implementation mode for dynamic correction is as follows:
calculating a deviation value
As shown in fig. 4, when embodied, when
Pumping current of seed source of target laser
Decreasing by 0.1 while the target laser continues to output energy into the photosensor; will be provided with
And
and (3) carrying out comparison:
if it is
≠
Then, continuously decrease
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when the temperature is higher than the set temperature
Pumping current of seed source
Increasing by 0.1 while the laser continues to output energy into the photosensor; the seed source detected by the photoelectric sensor outputs an energy value in real time
And the default output energy value of the seed source
And (3) carrying out comparison:
if it is
≠
While continuing to increase
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when in use
And stopping automatic calibration.
As shown in fig. 2, as an embodiment of the present invention, in order to achieve stable output of laser energy by a target laser, a real-time energy monitoring system is proposed, which has the following construction and monitoring principles:
when the seed source 7 outputs laser to the first spectroscope 1a with an incident angle of 45 degrees and a transmission inverse ratio of 0.1 to 99.9, the transmission part passes through the lens and is received by the first photoelectric sensor 1b, and is converted into an electric signal to be transmitted to the energy control system, the energy control system monitors the energy of the seed source, and when the energy received by the first photoelectric sensor 1b is weakened, the energy control system can adjust the energy output by the seed source according to the situation.
After the reflected light beam passes through the isolator 8, the reflected light beam irradiates a second spectroscope 2a with an incident angle of 45 degrees and a transmission reflectance of 0.1; this sensor monitors the light transmission efficiency of the isolator 8.
The beam expanding lens group 9 is composed of a plurality of lenses with different curvatures, and can amplify and output the diameter of an input light beam.
The polarization beam splitter 10 may allow vertically polarized light to pass through, and horizontally polarized light to be reflected; the light beam irradiates a third beam splitter 3a with an incident angle of 90 degrees and an inverse ratio of 0.1 to 99.9 after being amplified by the first stage, and the part of the incident light penetrating through the lens is input into a third photoelectric sensor 3b, converted into an electric signal and transmitted to an energy control system; the sensor monitors the energy of the light beam after the first amplification, and when the energy received by the third photoelectric sensor 3b is attenuated, the energy control system can adjust the relevant parameters of the first-stage amplification according to the situation.
The light beam passes through a wave plate with lambda =1/4 pi twice, is deflected by 1/2 pi based on the polarization direction of the polarization plate 16, returns to the laser crystal for second amplification, passes through the polarization beam splitter 10 after amplification and a fourth light splitter 4a with an incident angle of 45 degrees and a transmission inverse ratio of 0.1; the sensor monitors the energy of the beam after the second amplification.
When the energy received by the third photosensor 3b is attenuated, the energy control system can adjust the relevant parameters of the second amplification according to the situation; the reflected light enters the secondary laser crystal 13 to be amplified for the third time, and the beam shaper 14 can be composed of one or more groups of lenses and can adjust the energy distribution, the propagation mode, the spot mode and the like of the light beam as required.
The shaped light beam is irradiated onto a fifth spectroscope 5a with an incident angle of 45 degrees and a transmission reflectance of 0.1.
When the laser is switched to a state of not starting the second harmonic module 15, the sensor monitors the laser energy output by the whole laser. This sensor monitors the energy of the laser light at the second harmonic front fundamental frequency when the laser is switched to the state enabling the second harmonic module 15.
It will be appreciated that in the implementation, the second harmonic module 15, the sixth beam splitter 6a and the sixth photosensor 6b are mounted on a structure that can move as a whole, and when the laser is switched to the state of not activating the second harmonic module 15, the three parts move as a whole away from the optical path, and when the laser is switched to the state of activating the second harmonic module 15, the three parts move as a whole into the optical path. The incident angle of the sixth spectroscope 6a is 45 °, the transmission reflectance is 0.1. When the laser is switched to the state of starting the second harmonic module 15, the sensor monitors and monitors the laser energy output by the whole laser.
Based on the above technical concept, it should be noted that, in the embodiment of the present invention for constructing a real-time energy monitoring system, the number and the positions of the sensors may be arranged differently according to the internal optical path structure of the laser, for example, the laser has more amplification stages, and in order to monitor the energy of each stage, more photosensors are required to be installed. Meanwhile, the spectroscope may also select a mirror of which the back surface is polished, that is, energy monitoring may also be achieved by inputting light leakage from the back surface of the mirror of which the back surface is polished to the photosensor.
In the embodiment of the invention, considering that the prior art scheme is an open-loop control system, namely, when energy deviates, the device cannot detect and automatically correct, and an operator can burn or excessively treat a patient in an unconscious condition to cause serious complications or medical accidents, the invention adopts the design of an output energy closed-loop feedback control system, and the device starts output energy check before switching from standby to ready each time and immediately starts an energy self-correction mechanism to perform self-correction when the energy deviation is detected, so that the invention has the advantages of more stable output energy, safer treatment process and capability of avoiding unexpected injury to the patient.
To this end, in an embodiment of the present invention, the present invention provides a laser fault location unit connected to the system control unit to implement fault point location when the laser fails.
In a specific implementation, the specific way of positioning the fault point by the laser fault positioning unit is as follows:
according to the energy deviation value of each monitoring position, the specific implementation mode for realizing fault positioning is as follows:
the energy value of each monitoring position of the self-defined target laser seed source is recorded as
，
The energy deviation values of the various monitored positions of the target laser seed source,
the energy values set for the system control unit at each monitored location of the target laser seed source, then,
target-based laser
When is coming into contact with
Judging that the reading is normal; otherwise, the reading is abnormal.
Based on the above technical concept, it should be noted that, in the specific implementation, according to whether the readings of the sensors are normal or not, referring to table 1 below, the step of quickly locating the fault point inside the laser is as follows:
1) When the laser fails, the energy readings detected by all 6 photoelectric sensors are read: as shown in table 2 below:
2) Comparing the read 6 energy values with the reference energy value to calculate the energy deviation amount of each sensor, as shown in the following table 3:
3) Whether the reading of the position detected by each sensor is normal or not is judged according to the numerical value of the deviation, and the reading is shown in the following table 4:
4) Searching corresponding items in the table according to the reading state of each sensor;
5) It can be determined that the primary laser crystal 11 or the pump source 12 of the laser has failed in this case.
The invention can solve the problems that in the prior art, when the laser fails to output light beams normally, the difficulty in locating fault points inside the laser is high, and the laser needs to be disassembled for maintenance.
As a second aspect of the present invention, a laser control system with energy correction and spot adjustment functions is provided, which can be applied to achieve adaptive adjustment of a target laser spot shape, and includes:
the laser energy control unit is used for carrying out multistage amplification on the obtained seed source incident laser to obtain an energy deviation value output by the seed source incident laser under the current illumination intensity node; dynamically correcting the discharge voltage of a pumping source in the target laser according to the obtained energy deviation value so as to adjust the energy of the target laser and obtain stable output laser energy;
the system control unit receives the feedback signal of the laser energy control unit and then drives and controls the seed source of the target laser through the energy driving control unit;
the light path steering unit is used for converting the laser energy sent and output by the laser energy control unit into optical signals and respectively reflecting the optical signals to the laser energy self-correction unit and the light path transmission unit;
the optical path transmission unit is used for generating an I/O high-low level signal for representing the energy intensity of the laser output by the target laser according to the acquired optical signal and feeding the I/O high-low level signal back to the system control unit so as to realize the adjustment of the spot shape of the target laser;
and the laser energy self-correcting unit converts the acquired optical signals into voltage signals and feeds the voltage signals back to the system control unit so as to set the pulse width of the laser energy output by the target laser, dynamically corrects the optical signals transmitted and output by the light path steering unit and realizes the self-adaptive adjustment of the light spot shape of the target laser.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (6)
1. The laser control method with the functions of multi-stage energy monitoring and energy correction is characterized in that: the method comprises the following steps:
laser energy control unit, and
the system control unit for performing drive control on the target laser based on the feedback signal of the laser energy control unit comprises the following steps:
performing multi-stage amplification on the acquired real-time beam energy value of the incident laser of the target laser, and outputting energy deviation values of each monitoring position in the target laser under the current illumination intensity node;
according to the real-time input laser energy deviation value of the seed source and the output laser energy deviation value, the pump source discharge voltage V in the target laser p Performing dynamic correction to adjust the energy of the target laser to obtain stable output laser energy;
and realizing fault positioning according to the energy deviation value of each monitoring position.
2. The laser control method with multi-stage energy monitoring and energy correction functions of claim 1, wherein: the specific way of acquiring the energy deviation value is as follows:
s1, constructing an energy monitoring function
S1-1, grading the real-time light beam energy value E of the node under the current illumination intensity, and determining energy value information (E) of each of n groups in the energy values formed after energy grading according to a curve fitted by the light beam energy value E of the photoelectric sensor corresponding to a reverse current value I of the photoelectric sensor n ，I n ) Wherein n is a positive integer representing the group, E n Representing the energy value of the beam of the nth group, I n Representing the reverse current value of the nth group;
s1-2, determining a set { E) of mapping relations between a light beam energy value E and a reverse current value I according to the energy value information of the n groups 0 ,E 1 ,…E n-1 };{I 0 ,I 1 ,…,I n-1 The photoelectric sensor is built inside a target laser energy control unit;
s1-3, establishing a mapping relation function of the light beam energy value E and the reverse current value I based on the acquired mapping relation set:
s2, establishing an energy deviation value formula of the target laser
In the formula (I), the compound is shown in the specification,
representing the energy deviation value of the real-time light beam of the target laser;
the laser energy value is calculated after the system control unit receives a feedback signal of the target laser energy control unit;
indicating the laser energy value set by the system control unit;
s3, calculating laser energy deviation values of all monitoring positions, and substituting the laser energy deviation values into reverse current values collected by the photoelectric sensors at all monitoring positions
And obtaining the laser energy deviation value of each monitoring position.
3. The laser control method with multi-stage energy monitoring and energy correction functions of claim 2, wherein: the energy value of the output monitoring position of the self-defined target laser seed source is
，
Outputting an energy deviation value of the monitoring position for the target laser seed source,
the energy value set by the system control unit for the monitoring position output by the target laser seed source is obtained
According to the real-time output laser energy deviation value of the seed source, the pumping current of the seed source in the target laser is adjusted
p The specific implementation manner of performing dynamic correction is as follows:
when in use
Pumping current of seed source of target laser
Decreasing by 0.1 while the target laser continues to output energy into the photosensor; will be provided with
And with
And (3) carrying out comparison:
if it is
≠
Then, continuously decrease
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when in use
Pumping current of seed source
Increasing by 0.1 while the laser continues to output energy into the photosensor; the seed source detected by the photoelectric sensor outputs an energy value in real time
And the default output energy value of the seed source
And (3) carrying out comparison:
if it is
≠
Then, continuously increase
(ii) a If it is
=
In time, the seed source pumping current is saved
Stopping automatic calibration;
when in use
And stopping automatic calibration.
4. The laser control method with multi-stage energy monitoring and energy correction functions of claim 2, wherein:
the energy value of the input monitoring position of the self-defined target laser seed source is recorded as
，
Inputting an energy offset value for the monitored location for the target laser seed source,
inputting the energy value set by the system control unit of the monitoring position for the seed source of the target laser, then
The discharge voltage V of a pumping source in a target laser is measured according to the deviation value of the energy of the laser input by a seed source in real time p The specific implementation mode for dynamic correction is as follows:
when in use
And is and
in time, the laser energy control unit discharges the pumping source discharge voltage V in the target laser p The value is decreased by 10 while the target laser continues to output energy to the sensor in the laser energy control unit; energy detected by the sensor
And comparing with an energy value set by a system control unit: if it is
≠
When the Vp is not reduced, the Vp is reduced; if it is
=
When the adjustment is finished, stopping the adjustment;
when in use
And is and
the laser energy control unit discharges a pumping source discharge voltage V in the target laser p The value is increased by 10 while the target laser continues to output energy into the photosensor; energy detected by the photoelectric sensor
And setting the energy
And (3) carrying out comparison: if it is
≠
While continuing to increase V p (ii) a If it is
=
When the adjustment is finished, stopping the adjustment;
when in use
,
The laser energy control unit stops the energy adjustment.
5. The method of claim 2, wherein the laser control system comprises: the specific implementation mode for realizing fault positioning according to the energy deviation value of each monitoring position is as follows:
the energy value of each monitoring position of the self-defined target laser seed source is recorded as
，
The energy deviation values of the various monitored positions of the target laser seed source,
the energy values set for the system control unit at each monitored location of the target laser seed source, then,
target-based laser
，
When in use
Judging that the reading is normal; otherwise, the reading is abnormal.
6. The laser control method with multi-stage energy monitoring and energy correction functions of claim 2, wherein: in the step S1-1, n is 10.
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