CN111678595A - Laser power prejudging method based on prestored response curve - Google Patents
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- G—PHYSICS
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Abstract
The invention discloses a pre-stored response curve-based laser power pre-judging method, which comprises the steps of firstly selecting a plurality of power values in a test range of a laser power tester, testing a response curve corresponding to each power value and storing response curve data; testing the power of the laser to be tested by using a laser power tester to obtain the slope of a corresponding straight line of the two points in a time-response value coordinate system; traversing all the pre-stored response curves to obtain two pre-stored response curves closest to the slope of the obtained straight line; calculating the pre-judging laser power of the laser to be detected by utilizing a linear interpolation method; and further collecting the next data point to obtain the slope of the corresponding straight line of the newly collected data point and the previous data point in the time-response value coordinate system, and updating the prejudgment laser power of the laser to be detected until the preset laser power prejudgment end condition is met. The method can overcome the problem of long response time of a laser power tester instrument using a thermocouple or a thermopile as a sensor.
Description
Technical Field
The invention relates to the technical field of laser power testing, in particular to a laser power prejudging method based on a prestored response curve.
Background
With the development of laser technology, the laser light output power level is continuously improved, and high-power laser is increasingly applied in the fields of laser processing, laser medical treatment and the like, and has wide application prospects. The laser power is an important index of high-power laser, directly determines the action effect of the laser, and needs to be tested in the development, maintenance and repair of laser equipment. The laser power testing method is generally divided into two types, one type is based on a photoelectric sensor, an optical signal is directly converted into an electrical signal for testing, the testing method has the outstanding advantages of high responsiveness and short response time, but the saturated optical power of the photoelectric sensor is very low and is generally used for testing low-power laser, and if the testing method is used for testing high-power laser, a complex attenuation device is needed, so that the whole testing device becomes large in size and complex in structure; in addition, the responsivity of the photoelectric sensor obviously changes along with the laser wavelength, the wavelength of the laser to be tested is required to be known when the laser power is tested, and the laser to be tested only contains one wavelength and cannot be directly used for testing the power of the multi-wavelength synthetic laser containing multiple wavelengths.
The other type is based on a thermoelectric sensor, incident laser firstly undergoes photothermal conversion to convert a laser signal into a thermal signal, then the thermoelectric conversion is carried out to convert the thermal signal into an electrical signal, and the power of the incident laser to be tested is obtained by processing the electrical signal, the laser power testing method has the advantages of higher saturation power and relatively flat spectral response characteristic, so the method can be used for testing the laser power with higher power and multiple wavelengths, but because the thermal signal is converted from the optical signal to the electrical signal in the method, the response time is prolonged, a laser power tester based on the thermoelectric sensor usually takes a thermocouple or a thermopile as a heat sensor, the laser to be tested is absorbed by an absorber in the laser power tester after the laser enters the laser power tester, the laser is converted into heat, the heat is diffused to a cold end to form a temperature gradient, and the temperature gradient is tested by the thermocouple or the thermopile, the incident laser power is obtained by reverse-deducing, the laser power to be measured can be accurately reflected only after the thermal gradient is stable, the thermal gradient stabilization needs longer time, and the stabilization time is related to the heat capacity and the heat dissipation structure of the absorber.
The overlong response time makes the test time longer to prolonged research and development, maintenance and repair time of laser equipment, be unfavorable for promoting efficiency, in addition in the whole response time that the laser incidence laser tester registration that is incited to from awaiting measuring is stable, the laser instrument all need work always, to high power laser, can cause very big energy waste, and can shorten the life-span of laser instrument, consequently need develop a method and shorten the response time of laser power tester as far as possible.
Disclosure of Invention
The invention aims to provide a laser power prejudging method based on a pre-stored response curve, which can overcome the problem of long response time of a laser power tester instrument using a thermocouple or a thermopile as a sensor, and prejudges the laser power to be tested before the response value of the laser power tester reaches a stable state.
The purpose of the invention is realized by the following technical scheme:
a pre-stored response curve-based laser power pre-judging method comprises the following steps:
step 1, selecting a plurality of power values in a test range of a laser power tester, testing a response curve corresponding to each power value and storing the response curve data to obtain a plurality of pre-stored response curves;
step 4, calculating the prejudgment laser power of the laser to be measured by utilizing a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the slope of the straight line obtained in the step 2 and the laser power corresponding to the two pre-stored response curves;
and 6, repeating the operations from the step 3 to the step 5, and updating the pre-judging laser power of the laser to be detected until a preset laser power pre-judging finishing condition is met.
According to the technical scheme provided by the invention, the method can overcome the problem of long response time of the laser power tester with the thermocouple or the thermopile as the sensor, and can be used for prejudging the laser power to be tested before the response value of the laser power tester reaches a stable state, so that the response speed of the tester is increased, and the response time of the tester is shortened.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a laser power prejudging method based on a pre-stored response curve according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a pre-stored response curve of a calorimetric detector according to an exemplary embodiment of the present invention;
FIG. 3 is a process diagram of linear interpolation according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The following will further describe the embodiment of the present invention in detail with reference to the accompanying drawings, and as shown in fig. 1, a schematic flow chart of a laser power prejudging method based on a pre-stored response curve provided by the embodiment of the present invention is shown, where the method includes:
step 1, selecting a plurality of power values in a test range of a laser power tester, testing a response curve corresponding to each power value and storing the response curve data to obtain a plurality of pre-stored response curves;
in the step, the pre-stored response curves are more than or equal to two, are the change curves of the power along with the time, and are positioned in a time-response value coordinate system; the time-response value coordinate system is a rectangular coordinate system which takes the sampling time as a horizontal axis and the response value of the laser power tester as a vertical axis.
In the concrete implementation, if the laser power tester has a plurality of gears, testing and pre-storing a response curve for each gear, pre-storing the response curve for each gear to pre-judge the laser power, wherein the pre-storing response curve for each gear is more than or equal to two.
And the sampling rate of the pre-stored response curve is more than or equal to the sampling rate of the response value of the laser to be detected.
in a specific implementation, the power of the laser to be detected is continuous laser power or pulse laser average power.
The laser to be tested is incident to the laser power tester, and the response value of the laser power tester begins to increase;
when the response value reaches a preset acquisition threshold value, namely the response value is greater than or equal to the preset acquisition threshold value, starting data acquisition, and recording acquired data, including acquisition time and response value, wherein each data acquisition point comprises a pair of acquisition time and response value data;
after the initial two points are collected, the straight line determined by the two points is solved in the time-response value coordinate system according to the data of the two collected points, and then the slope corresponding to the straight line is solved.
in the step, aiming at the slope of the pre-stored response curve in the corresponding acquisition time range, if the pre-stored response curve in the corresponding acquisition time range has three or more data acquisition points, two adjacent acquisition points can determine a subdivision slope;
and if the laser to be detected has a plurality of subdivision slopes in the corresponding acquisition time range, the slope of the pre-stored response curve in the corresponding acquisition time range refers to the average value of the plurality of subdivision slopes.
If the pre-stored response curve in the corresponding acquisition time range only has one sampling point, the slope of a straight line determined by the sampling point and the previous sampling point or the next sampling point is taken as the slope of the pre-stored response curve in the corresponding acquisition time range.
Step 4, calculating the prejudgment laser power of the laser to be measured by utilizing a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the slope of the straight line obtained in the step 2 and the laser power corresponding to the two pre-stored response curves;
in this step, the process of calculating the predicted laser power of the laser to be measured by using a linear interpolation method is as follows:
the slopes corresponding to the two pre-stored response curves obtained in step 3 are η respectivelym,jAnd ηm-1,jAnd ηm,j＞ηm-1,jThe slope of the straight line obtained in step 2 is η0,1；
Slope ηm-1,jThe laser power corresponding to the prestored response curve is P1-insSlope ηm,jThe laser power corresponding to the prestored response curve is P2-insThen, the pre-determined laser power calculation formula of the laser to be measured is as follows:
and 6, repeating the operations from the step 3 to the step 5, and updating the pre-judging laser power of the laser to be detected until a preset laser power pre-judging finishing condition is met.
In the step, the slope between two adjacent points is smaller and smaller as the number of acquisition points is increased, and the prejudged laser power is closer to the true value as the number of acquisition points is increased. When the acquisition time is close to the response time of the laser power tester, the prejudgment algorithm can be not used any more, namely, the prejudgment ending condition of the laser power can be set, and the prejudgment is stopped when the condition is reached.
In a specific implementation, the preset laser power prejudging end condition is as follows:
collecting points to reach a preset value; or the deviation between the acquisition value and the pre-judgment value is less than or equal to a preset value.
The process of the laser power prediction method is described in detail below with specific examples, and fig. 2 is a schematic diagram of a pre-stored response curve of a thermal detector in the examples of the present invention, the curve is measured by using a high-precision X-Y recorder, in fig. 2, the abscissa represents time in s, and the ordinate represents voltage output by a thermopile in μ V.
As can be seen from fig. 2, the pre-stored response curves of the detectors are not consistent for the laser to be measured with different powers, but the response time of the detector is about 10s when the voltage value is from 0 to 90% of the saturation value. As shown in fig. 2, fig. 2 shows that, to distinguish the response time curves corresponding to different powers to be measured, only time less than 1s is required, and as long as the curves can be distinguished, the optical power to be measured corresponding to the curves can be directly given, so that the power of the laser to be measured can be given in less than 1s from the start of measurement, and the used time is far shorter than the response time of the detector.
In practical applications, it is difficult to ensure that the optical power to be measured is exactly equal to the optical power corresponding to a pre-stored response curve in the memory, and generally, the optical power to be measured is located between two pre-stored response curves, so that the pre-determined laser power of the laser to be measured needs to be calculated by using a linear interpolation method, as shown in fig. 3, which is a schematic process diagram of the linear interpolation method in the example of the present invention, specifically:
(1) the laser power tester for laser incidence to be tested starts to increase the response value of the laser power tester, when the response value reaches a preset acquisition threshold value, the laser power tester starts to acquire, and records a first acquisition power value P0,0After a collection time interval Δ t, a power is again obtainedNumber P0,1The points acquired twice are respectively Q on the time-response value curve chart0,0And Q0,1As shown in fig. 3. However, it should be noted that since the absolute time of two points is not known, the coordinate position of the horizontal axis is uncertain, and the slope of the line of the laser to be measured is calculated according to the two collected data:
(2) two pre-stored response curves S1, S2 are determined that are closest to the slope of the line
Traversing all the pre-stored response curves, and searching all the pre-stored response curves with the power less than P0,1But closest to P0,1For the ith curve, suppose that the jth point Qi,jIf the condition is satisfied, the point Q isi,jCorresponding power Pi,jSatisfies the following conditions:
then, the point Q on each prestored response curve is calculatedi,jThe slope of (d) is expressed as:
wherein, ti,jAnd ti,j-1Respectively correspond to Pi,jAnd Pi,j-1The collection time point of (2) is given in a pre-stored response curve library;
in all pre-stored response curves, the slope η is foundi,jSlope η of the line with the laser to be measured0,1The closest two curves, assuming that the two curves found with the closest slopes are η respectivelym,jAnd ηm-1,jAnd ηm,j＞ηm-1,jη with small slopem-1,jS1, η with large slopem,jIs S2.
(3) Calculating the prejudgment laser power of the laser to be detected by utilizing a linear interpolation method, specifically:
the corresponding slopes of the two pre-stored response curves are η respectivelym,jAnd ηm-1,jAnd ηm,j＞ηm-1,j；
Slope ηm-1,jThe laser power corresponding to the prestored response curve is P1-insSlope ηm,jThe laser power corresponding to the prestored response curve is P2-insThen, the pre-determined laser power calculation formula of the laser to be measured is as follows:
(4) further collecting the next data point of the laser to be measured, and collecting the power P next0,2At the arrival, with P0,1In place of P0,0，P0,2In place of P0,1Repeating the steps (1) to (3), and circulating the steps until the collection times reach a preset value or the collected P0,iAnd P0,i-1The difference is less than or equal to a preset value or the slope of a straight line determined by two adjacent acquisition points is less than or equal to a preset value.
It is noted that those skilled in the art will recognize that embodiments of the present invention are not described in detail herein.
In summary, the method of the embodiment of the present invention is applicable to a laser power tester using a thermocouple or a thermopile as a sensor, and can overcome the problem of long response time of the laser power tester using the thermocouple or the thermopile as a sensor, and pre-determine the laser power to be tested before the response value of the laser power tester reaches a stable state, thereby increasing the response speed of the laser power tester and shortening the response time of the laser power tester.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A laser power prejudging method based on a prestored response curve is characterized by comprising the following steps:
step 1, selecting a plurality of power values in a test range of a laser power tester, testing a response curve corresponding to each power value and storing the response curve data to obtain a plurality of pre-stored response curves;
step 2, testing the power of the laser to be tested by using a laser power tester, collecting a response value when the response value of the laser power tester reaches a collection threshold value, collecting two initial points, and obtaining the slopes of corresponding straight lines of the two points in a time-response value coordinate system;
step 3, traversing all the pre-stored response curves obtained in the step 1, and comparing the slope of the pre-stored response curve in the corresponding acquisition time range with the slope of the straight line obtained in the step 2 to obtain two pre-stored response curves with the slope value closest to the slope of the straight line;
step 4, calculating the prejudgment laser power of the laser to be measured by utilizing a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the slope of the straight line obtained in the step 2 and the laser power corresponding to the two pre-stored response curves;
step 5, further collecting the next data point of the laser to be detected to obtain the slope of the corresponding straight line of the newly collected data point and the previous data point in the time-response value coordinate system;
and 6, repeating the operations from the step 3 to the step 5, and updating the pre-judging laser power of the laser to be detected until a preset laser power pre-judging finishing condition is met.
2. The method according to claim 1, wherein in step 1, the pre-stored response curves are two or more, and the pre-stored response curves are power variation curves with time and are located in a time-response coordinate system;
the time-response value coordinate system is a rectangular coordinate system which takes the sampling time as a horizontal axis and the response value of the laser power tester as a vertical axis.
3. The method according to claim 1, wherein in the step 2, the power of the laser to be measured is a continuous laser power or a pulsed laser average power.
4. The method for prejudging laser power based on a pre-stored response curve according to claim 1, wherein the process of the step 2 specifically comprises:
the laser to be tested is incident to the laser power tester, and the response value of the laser power tester begins to increase;
when the response value reaches a preset acquisition threshold value, starting data acquisition, and recording acquired data, including acquisition time and response values, wherein each data acquisition point comprises a pair of acquisition time and response value data;
after the initial two points are collected, the straight line determined by the two points is solved in the time-response value coordinate system according to the data of the two collected points, and then the slope corresponding to the straight line is solved.
5. The method according to claim 1, wherein in step 3, for the slope of the pre-stored response curve in the corresponding collection time range, if the pre-stored response curve in the corresponding collection time range has three or more data collection points, two adjacent collection points determine a subdivision slope;
and if the laser to be detected has a plurality of subdivision slopes in the corresponding acquisition time range, the slope of the pre-stored response curve in the corresponding acquisition time range refers to the average value of the plurality of subdivision slopes.
6. The method according to claim 1, wherein in step 3, for the slope of the pre-stored response curve in the corresponding collection time range, if there is only one sampling point in the pre-stored response curve in the corresponding collection time range, the slope of the straight line determined by the sampling point and the previous sampling point or the next sampling point is used as the slope of the pre-stored response curve in the corresponding collection time range.
7. The method according to claim 1, wherein in step 4, the process of calculating the predicted laser power of the laser to be measured by using the linear interpolation method comprises:
the slopes corresponding to the two pre-stored response curves obtained in step 3 are η respectivelym,jAnd ηm-1,jAnd ηm,j＞ηm-1,jThe slope of the straight line obtained in step 2 is η0,1；
Slope ηm-1,jThe laser power corresponding to the prestored response curve is P1-insSlope ηm,jThe laser power corresponding to the prestored response curve is P2-insThen, the pre-determined laser power calculation formula of the laser to be measured is as follows:
8. the method according to claim 1, wherein in step 6, the predetermined laser power prediction end condition is:
collecting points to reach a preset value;
or the deviation between the acquisition value and the pre-judgment value is less than or equal to a preset value.
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| US20080025352A1 (en) * | 2006-07-25 | 2008-01-31 | Fanuc Ltd | Laser apparatus having ability to automatically correct laser beam power |
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