CN111678595B - Laser power pre-judging method based on pre-stored response curve - Google Patents
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Abstract
The invention discloses a laser power pre-judging method based on a pre-stored response curve, 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 two points in a time-response value coordinate system; traversing all pre-stored response curves to obtain two pre-stored response curves closest to the slope of the obtained straight line; calculating the prejudging laser power of the laser to be measured by using a linear interpolation method; and further acquiring the next data point, obtaining the slope of the corresponding straight line of the newly acquired data point and the previous data point in the time-response value coordinate system, and updating the prejudging laser power of the laser to be detected until the prejudging end condition of the laser power is met. The method can overcome the problem of long response time of a laser power tester instrument which uses 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 pre-judging method based on a pre-stored 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 to the fields of laser processing, laser medical treatment and the like, and has wide application prospect. 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 testing method of the laser power is generally divided into two types, one type is based on a photoelectric sensor, and an optical signal is directly converted into an electric signal for testing, and the testing method has the outstanding advantages of high response 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 huge and has a complex structure; in addition, the responsivity of the photoelectric sensor is obviously changed along with the laser wavelength, the wavelength of the laser to be tested needs to be known when the laser power is tested, and the laser to be tested can only contain one wavelength and cannot be directly used for testing the power of the multi-wavelength composite laser containing multiple wavelengths.
The other type is based on a thermoelectric sensor, the incident laser is firstly subjected to photo-thermal conversion, the laser signal is converted into a thermal signal, then the thermoelectric conversion is carried out, the thermal signal is converted into an electric signal, the power of the incident laser to be tested is obtained through the processing of the electric signal, the laser power testing method has the advantages of higher saturated power and flatter spectral response characteristic, so the method can be used for testing higher power and multi-wavelength laser power, but the response time is prolonged because the method is converted from the optical signal to the electric signal through the thermal signal, the laser power tester based on the thermoelectric sensor usually takes a thermocouple or a thermopile as a thermal sensor, the laser to be tested is absorbed by an absorber in the laser power tester after being subjected to the incident laser power tester, the laser is converted into heat, the heat is diffused to a cold end to form a temperature gradient, the temperature gradient is used for testing by the thermocouple or the thermophore, the incident laser power is reversely pushed, the laser power to be tested can accurately reflect the laser power to be tested only after the thermal gradient is stabilized, the stabilizing time is longer, the stabilizing time is related to the thermal capacity and the heat dissipation structure of the absorber, the laser power to be tested is large, the response time is more than ten seconds, and the time is more stable the time is required to reach the tens of seconds.
The overlong response time enables the test time to be longer, so that the research and development, maintenance and repair time of the laser equipment are prolonged, the efficiency is not improved, in addition, the laser needs to work all the time from the incidence of the laser to be tested to the whole response time of the laser tester with stable indication, and for high-power laser, great energy waste can be caused, and the service life of the laser can be shortened, so that the response time of the laser power tester needs to be shortened as much as possible by developing a method.
Disclosure of Invention
The invention aims to provide a laser power pre-judging method based on a pre-stored response curve, which can solve the problem of long response time of a laser power tester instrument taking a thermocouple or a thermopile as a sensor, and pre-judges laser power to be tested before the response value of the laser power tester reaches a stable state.
The invention aims at realizing the following technical scheme:
a laser power pre-determination method based on a pre-stored response curve, the method comprising:
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 response curve data to obtain a plurality of pre-stored response curves;
step 4, calculating the pre-judging laser power of the laser to be detected by using a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the linear slope obtained in the step 2 and the laser power corresponding to the two pre-stored response curves;
and step 6, repeating the operations from the step 3 to the step 5, and updating the prejudging laser power of the laser to be tested until the prejudging laser power of the laser to be tested meets the preset laser power prejudging ending condition.
According to the technical scheme provided by the invention, the problem of long response time of the laser power tester instrument taking the thermocouple or the thermopile as the sensor can be solved, the laser power to be tested is predicted before the response value of the laser power tester reaches a stable state, the response speed of the instrument is improved, and the response time of the instrument is shortened.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a laser power pre-judging method based on a pre-stored response curve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pre-stored response curve of a calorimetric probe according to an example of the invention;
FIG. 3 is a schematic diagram of a linear interpolation process in an example of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
An embodiment of the present invention will be described in further detail below with reference to the accompanying drawings, and as shown in fig. 1, a flowchart of a method for predicting laser power based on a pre-stored response curve according to an 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 response curve data to obtain a plurality of pre-stored response curves;
in the step, the number of the pre-stored response curves is more than or equal to two, and the pre-stored response curves are power change curves along with time and are positioned in a time-response value coordinate system; the time-response value coordinate system is a rectangular coordinate system taking the sampling time as a horizontal axis and the response value of the laser power tester as a vertical axis.
In the specific implementation, if the laser power tester has a plurality of gears, testing and pre-storing response curves for each gear, and pre-judging the laser power by utilizing the pre-storing response curves of the gears, wherein each gear pre-storing response curve is more than or equal to two.
The sampling rate of the pre-stored response curve is larger than or equal to the sampling rate of the laser response value to be measured.
in a specific implementation, the power of the laser to be measured is continuous laser power or pulse laser average power.
The laser to be tested enters 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, namely the response value is larger than or equal to the preset acquisition threshold, starting data acquisition, and recording acquired data, wherein the acquired data comprises acquisition time and response value, and each data acquisition point comprises a pair of acquisition time and response value data;
after the initial two points are acquired, a straight line determined by the two points is obtained in a time-response value coordinate system according to the data of the two acquired points, and then the slope corresponding to the straight line is obtained.
in the step, aiming at the slope of a pre-stored response curve in a corresponding acquisition time range, if three or more data acquisition points exist in the pre-stored response curve in the corresponding acquisition time range, two adjacent acquisition points can determine a subdivision slope;
and if the laser to be measured has a plurality of subdivision slopes in the corresponding acquisition time range, the slope of the prestored response curve in the corresponding acquisition time range refers to the average value of the subdivision slopes.
If the pre-stored response curve in the corresponding acquisition time range has only one sampling point, 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 acquisition time range.
Step 4, calculating the pre-judging laser power of the laser to be detected by using a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the linear slope 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 the linear interpolation method is as follows:
according to the slope eta corresponding to the two pre-stored response curves obtained in the step 3 m,j And eta m-1,j And eta m,j ＞η m-1,j The method comprises the steps of carrying out a first treatment on the surface of the The slope of the straight line obtained in the step 2 is eta 0,1 ；
Slope eta m-1,j The laser power corresponding to the pre-stored response curve is P 1-ins Slope eta m,j The laser power corresponding to the pre-stored response curve is P 2-ins The calculation formula of the prejudging laser power of the laser to be tested is as follows:
and step 6, repeating the operations from the step 3 to the step 5, and updating the prejudging laser power of the laser to be tested until the prejudging laser power of the laser to be tested meets the preset laser power prejudging ending condition.
In this step, as the number of the acquisition points increases, the slope between two adjacent points becomes smaller, and the predicted laser power becomes closer to the true value as the number of the acquisition points increases. When the acquisition time is close to the response time of the laser power tester, a prejudgment algorithm can be not used any more, namely, a laser power prejudgment ending condition can be set, and when the condition is reached, prejudgment is stopped.
In a specific implementation, the preset laser power prejudging ending condition is as follows:
collecting the number of points to reach a preset value; or, the deviation between the acquired value and the pre-judging value is smaller than or equal to a preset value.
The following describes the process of the laser power pre-judging method in detail by using a specific example, and fig. 2 is a schematic diagram of a pre-stored response curve of a calorimetric probe in the example of the invention, where the curve is measured by using a high-precision X-Y recorder, and the abscissa in fig. 2 represents time in s, and the ordinate represents voltage output by a thermopile in μv.
As can be seen from fig. 2, the pre-stored response curves of the detectors are not consistent for the lasers to be measured with different powers, but in general, the response time of the detectors corresponding to the voltage value from 0 to 90% of the saturation value is about 10s. As the corresponding pre-stored response curves of different powers can be distinguished when the response time of the detector is far smaller than that of the corresponding pre-stored response curves, as shown in fig. 2, fig. 2 shows that the response time curves corresponding to different powers to be detected need less than 1s, and the light power to be detected corresponding to the curves can be directly given out as long as the curves can be distinguished, so that the power of the laser to be detected can be given out in less than 1s from the beginning of measurement, and the time is far smaller than that of 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 certain pre-stored response curve in the memory, and is generally located between two pre-stored response curves, so that it is necessary to calculate the pre-determined laser power of the laser to be measured 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 starts to collect when the response value reaches a preset collection threshold value, and records a first collection power value P 0,0 After the acquisition time interval deltat, a power value P is obtained again 0,1 The two collected points are respectively represented by Q on a time-response value graph 0,0 And Q 0,1 As shown in fig. 3. It should be noted, however, that since the absolute time of the two points is not known, the position of the horizontal axis coordinates is uncertain, and the slope of the line of the laser to be measured is calculated from the two collected data:
(2) Determining two pre-stored response curves S1, S2 closest to the slope of the line
Traversing all pre-stored response curves, and searching that the power on all pre-stored response curves is smaller than P 0,1 But is closest to P 0,1 For the ith curve, if the jth point Q i,j If the condition is satisfied, then the point Q i,j Corresponding powerP i,j The method meets the following conditions:
then calculate the point Q on each pre-stored response curve i,j Slope at, expressed as:
wherein t is i,j And t i,j-1 Respectively correspond to P i,j And P i,j-1 The acquisition time points of (2) are given in a pre-stored response curve library;
in all pre-stored response curves, find the slope η i,j Slope eta of straight line with laser to be measured 0,1 The two curves closest to each other are assumed to be η m,j And eta m-1,j And eta m,j ＞η m-1,j η with small slope m-1,j S1, η with large slope m,j S2.
(3) Calculating the prejudging laser power of the laser to be measured by using a linear interpolation method, specifically:
the corresponding slopes of the two pre-stored response curves are eta respectively m,j And eta m-1,j And eta m,j ＞η m-1,j ；
Slope eta m-1,j The laser power corresponding to the pre-stored response curve is P 1-ins Slope eta m,j The laser power corresponding to the pre-stored response curve is P 2-ins The calculation formula of the prejudging laser power of the laser to be tested is as follows:
(4) Further collecting the next data point of the laser to be measured, and collecting the next power P 0,2 Upon arrival, with P 0,1 Instead of P 0,0 ，P 0,2 Instead of P 0,1 Repeating the steps (1) - (3) until the collection times reach a preset value or the collected P 0,i And P 0,i-1 The difference is smaller than or equal to a preset value or the slope of a straight line determined by two adjacent acquisition points is smaller than or equal to the preset value.
It is noted that what is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
In summary, the method provided by the embodiment of the invention is suitable for the laser power tester taking the thermocouple or the thermopile as the sensor, can overcome the problem of long response time of the laser power tester taking the thermocouple or the thermopile as the sensor, and can predict the laser power to be tested before the response value of the laser power tester reaches a stable state, thereby improving the response speed of the instrument and shortening the response time of the instrument.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. The laser power prejudging method based on the pre-stored 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 response curve data to obtain a plurality of pre-stored response curves;
the pre-stored response curves are more than or equal to two, are power change curves along with time and are positioned in a time-response value coordinate system;
the time-response value coordinate system is a rectangular coordinate system taking sampling time as a horizontal axis and the response value of the laser power tester as a vertical axis;
step 2, testing the power of the laser to be tested by using a laser power tester, and collecting response values when the response values of the laser power tester reach a collection threshold value, and collecting initial two points to obtain 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 slope values closest to the slope of the straight line;
step 4, calculating the pre-judging laser power of the laser to be detected by using a linear interpolation method according to the slopes corresponding to the two pre-stored response curves obtained in the step 3, the linear slope 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 measured, and obtaining the slopes of corresponding straight lines of the newly collected data point and the previous data point in a time-response value coordinate system;
and step 6, repeating the operations from the step 3 to the step 5, and updating the prejudging laser power of the laser to be tested until the prejudging laser power of the laser to be tested meets the preset laser power prejudging ending condition.
2. The method according to claim 1, wherein in the step 2, the power of the laser to be measured is continuous laser power or pulse laser average power.
3. The method for predicting laser power based on a pre-stored response curve according to claim 1, wherein the process of step 2 specifically comprises:
the laser to be tested enters 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, wherein the acquired data comprises acquisition time and response value, and each data acquisition point comprises a pair of acquisition time and response value data;
after the initial two points are acquired, a straight line determined by the two points is obtained in a time-response value coordinate system according to the data of the two acquired points, and then the slope corresponding to the straight line is obtained.
4. The method according to claim 1, wherein in step 3, for the slope of the pre-stored response curve in the corresponding acquisition time range, if there are three or more data acquisition points of the pre-stored response curve in the corresponding acquisition time range, two adjacent acquisition points determine a subdivision slope;
and if the laser to be measured has a plurality of subdivision slopes in the corresponding acquisition time range, the slope of the prestored response curve in the corresponding acquisition time range refers to the average value of the subdivision slopes.
5. The method according to claim 1, wherein in step 3, for the slope of the pre-stored response curve in the corresponding acquisition time range, if there is only one sampling point in the pre-stored response curve in the corresponding acquisition 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 acquisition time range.
6. The method for predicting laser power based on a pre-stored response curve according to claim 1, wherein in step 4, the process of calculating the predicted laser power of the laser to be measured by using a linear interpolation method is as follows:
according to the slope eta corresponding to the two pre-stored response curves obtained in the step 3 m,j And eta m-1,j And eta m,j ＞η m-1,j The method comprises the steps of carrying out a first treatment on the surface of the The slope of the straight line obtained in the step 2 is eta 0,1 ；
Slope eta m-1,j The laser power corresponding to the pre-stored response curve is P 1-ins Slope eta m,j The laser power corresponding to the pre-stored response curve is P 2-ins Then to be measuredThe laser power calculation formula for laser prejudging is as follows:
7. the method for predicting laser power based on a pre-stored response curve according to claim 1, wherein in step 6, the preset laser power predicting end condition is:
collecting the number of points to reach a preset value;
or, the deviation between the collected response value and the prejudged laser power is smaller than or equal to a preset value.
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| CN102610996A (en) * | 2012-01-19 | 2012-07-25 | 厦门优迅高速芯片有限公司 | Method and device for rapidly calibrating luminous power |
| CN104362509A (en) * | 2014-11-10 | 2015-02-18 | 李德龙 | Pulse energy dynamic compensation system and method for VCSEL laser device |
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| CN106197761A (en) * | 2016-07-30 | 2016-12-07 | 中北大学 | A kind of thermocouple sensor time constant test device and method |
| CN109738064A (en) * | 2019-01-11 | 2019-05-10 | 厦门盈趣科技股份有限公司 | The pulse power measurement of pulse laser |
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| JP2008028317A (en) * | 2006-07-25 | 2008-02-07 | Fanuc Ltd | Laser device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102610996A (en) * | 2012-01-19 | 2012-07-25 | 厦门优迅高速芯片有限公司 | Method and device for rapidly calibrating luminous power |
| CN104362509A (en) * | 2014-11-10 | 2015-02-18 | 李德龙 | Pulse energy dynamic compensation system and method for VCSEL laser device |
| CN105424200A (en) * | 2015-11-04 | 2016-03-23 | 中国电子科技集团公司第四十一研究所 | Quick response implementation method for thermopile detector |
| CN106197761A (en) * | 2016-07-30 | 2016-12-07 | 中北大学 | A kind of thermocouple sensor time constant test device and method |
| CN109738064A (en) * | 2019-01-11 | 2019-05-10 | 厦门盈趣科技股份有限公司 | The pulse power measurement of pulse laser |
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