CN113375795B - Heat loss compensation method for laser energy meter - Google Patents
Heat loss compensation method for laser energy meter Download PDFInfo
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- CN113375795B CN113375795B CN202110719524.6A CN202110719524A CN113375795B CN 113375795 B CN113375795 B CN 113375795B CN 202110719524 A CN202110719524 A CN 202110719524A CN 113375795 B CN113375795 B CN 113375795B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000012806 monitoring device Methods 0.000 claims description 6
- BULVZWIRKLYCBC-UHFFFAOYSA-N phorate Chemical compound CCOP(=S)(OCC)SCSCC BULVZWIRKLYCBC-UHFFFAOYSA-N 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0252—Constructional arrangements for compensating for fluctuations caused by, e.g. temperature, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a photometer; Purge systems, cleaning devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a laser energy meter heat loss compensation method, which comprises the following steps: (1) Measuring the beam splitting ratio of the beam splitter at the angleaThe method comprises the steps of carrying out a first treatment on the surface of the (2) Measuring the power value of reflected lightP 1 The method comprises the steps of carrying out a first treatment on the surface of the (3) According to the formulaP 2 =P 1 /aEstimating the transmitted light power; (4) Calculating the longest laser timet max The method comprises the steps of carrying out a first treatment on the surface of the (5) Setting the working frequency of the energy meter data acquisition devicefFinding out the maximum temperature difference delta in measurementT max And measuring the temperature difference delta at each momentT 1/f ，ΔT f2/ ，ΔT f3/ …ΔT n f/ The method comprises the steps of carrying out a first treatment on the surface of the (6) Measuring the precise time of each lasertLight yield per light emissionP，t<t max The method comprises the steps of carrying out a first treatment on the surface of the (7) Using the formulaE Measuring =P*n/fCalculation ofn/fStandard laser energy obtained by laser energy at the moment,E n/fmeasuring The method comprises the steps of carrying out a first treatment on the surface of the (8) By means ofr=E f1/measurement /ΔT f1/ Calculating energy meter coefficientsrThe method comprises the steps of carrying out a first treatment on the surface of the (9) calculating heat losses at different temperatures; (10) Proceeding binomial formulaQ=d*ΔT max 2 Fitting; (11) Measuring the temperature difference delta at each momentT 1/f ，ΔT f2/ ，ΔT f3/ …ΔT n f/ And pressQ n/f =d*ΔT n/f 2 Calculation ofQ f1/ ，Q /f2 ，Q f3/ …Q n f/ The laser energy is calculated according to the formula.
Description
Technical Field
The invention relates to a method for compensating heat loss of a laser energy meter, and belongs to the field of lasers.
Background
The calorimetric laser energy meter measures the laser energy according to a formula by measuring the temperature difference delta T before and after the laser irradiates the energy meter. But when measuring long pulse laser energy, the heat loss of the energy meter can have a large impact on the measurement results. The inherent heat loss characteristics of the laser energy meter need to be measured and compensated accordingly.
Currently, the method for compensating the heat loss of the laser energy meter is to compensate according to a formula by measuring the time constant of the energy meter. See the paper for research on the method for compensating the system laser energy loss. The method comprises the steps of irradiating an energy meter probe by using laser pulse with known energy, collecting data of a temperature measuring sensor in the energy meter probe for a long time by using a data collecting device, and fitting the data by using a curve of an energy meter cooling stage to obtain a time constant of the energy meter. And compensating the obtained time constant as a parameter into the temperature obtained by the data acquisition device at each moment according to the Newton heating curve equation. Finally, the maximum temperature change delta T of the temperature sensor in the laser energy meter is obtained max And according to the formula e=cm Δt max The laser energy is calculated.
Current methods of compensating for heat loss from laser energy meters require measuring the weight of each component of the energy meter, as well as the specific heat capacity of each component. And the requirement on the measurement precision of each link is higher, and the method is relatively suitable for the development of a measurement reference detector.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a method for compensating the heat loss of a laser energy meter, which reduces the number of measurement variables required by the heat loss compensation and the technical requirement of the heat loss compensation, and directly compensates the heat loss of the laser energy meter by taking laser energy with different sizes as a standard and measuring the heat loss of the laser energy meter at different temperatures of the energy meter.
The technical scheme is as follows: in order to solve the technical problems, the method for compensating the heat loss of the laser energy meter is characterized by comprising the following steps:
(1) Measuring a beam splitting ratio a of the beam splitting mirror at the angle, wherein a is the power ratio of reflected light to projected light;
(2) Turning on laser to measure power value P of reflected light by using laser power and light emitting time monitoring device 1 ；
(3) According to formula P 2 ＝P 1 A, estimating the transmitted light power;
(4) According to the measuring range designed by the laser energy meter, according to the formula t=E/P 2 Calculating the longest laser time t max E is the measuring range designed by the laser energy meter;
(5) Setting the working frequency of the energy meter data acquisition device as f, and finding out the maximum temperature difference delta T in measurement max The laser energy meter uses the voltage of each sampling point of the thermopile to correspond to a temperature difference, the place where the voltage is maximum is found to be equivalent to the moment when the temperature difference is maximum, the temperature difference is the temperature difference between the temperature at each moment and the temperature before measurement, the laser energy meter calculates the laser energy by measuring the temperature difference, the maximum temperature difference is found to be equivalent to the energy of the found laser, and the temperature difference delta T at each moment is measured 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f The temperature difference is the initial temperature of the energy meter and the temperature after the laser irradiates the energy meter; n refers to the time that the nth sampling point n/f is the nth sampling point, and n corresponds to the sampling point with the largest temperature difference.
(6) The accurate light emitting time t of each laser and the light emitting rate P, t of each light emitting are measured by a laser power and light emitting time monitoring device<t max ；
(7) Using formula E Measuring Standard laser energy obtained by calculating laser energy at n/f time by p×n/f, E n/f measurement ；
(8) By r=e 1/f measurement /ΔT 1/f Calculating an energy meter coefficient r;
(9) According to the formula q=p n/f-r Δt n/f Calculating heat loss Q at different temperatures 1/f ，Q 2/f ，Q 3/f ………Q n/f ；
(10) Will Q 1/f ，Q 2/f ，Q 3/f ………Q n/f For DeltaT 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f N is the number of sampling points, and the binomial q=d×Δt is performed max 2 Fitting, wherein d is a coefficient obtained through fitting, and a curve fitting formula is stored in software for standby;
(11) Setting the working frequency of the energy meter data acquisition device to f 1 And measuring unknown laser energy to find out the maximum temperature difference delta T max And measuring the temperature difference at each time before the maximum point of the temperature difference l is the number of samples between the maximum temperature points and is defined as q=d×Δt max 2 Calculate-> According to the formula->The laser energy is calculated.
The beneficial effects are that: the method for compensating the heat loss of the laser energy meter directly calculates the heat loss of the laser under different temperature differences by utilizing the characteristic that the continuous laser emits light in a certain time to accurately simulate the light emitting energy and combining the sampling frequency of the long pulse laser energy meter to perform the heat compensation. Under the condition of meeting the requirement of the precision of the commercial laser energy meter, the measuring parameters of the heat loss compensation of the laser energy meter are greatly reduced, and the heat loss compensation of the commercial laser energy meter is carried out under the condition of more proper conditions.
Detailed Description
1) The beam splitting ratio a=0.3 of the beam splitter at this angle was measured.
2) Turning on laser to measure power value P of reflected light by using laser power and light emitting time monitoring device 1 ＝30W。
3) According to formula P 2 ＝P 1 A, estimating the transmitted light power P 2 ＝100W。
4) According to the designed measuring range of the laser energy meter, according to the formula t=e Is provided with /P 2 Calculating the longest laser time t max ＝30s。
5) Setting the working frequency of the energy meter data acquisition device to be f=100 Hz, and finding out the maximum temperature difference delta T in measurement max =10 ℃, and the temperature difference Δt at each time is measured 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f 。
6) The accurate light emitting time t=20s of each laser and the light emitting rate p=101w of each light emitting are measured by a laser power and light emitting time monitoring device.
7) Using formula E Measuring Standard laser energy obtained by calculating n/f time laser energy by p×n/f, E n/f measurement 。
8) By r=e 1/f measurement /ΔT 1/f The energy meter coefficient r=3 is calculated.
9) According to the formula q=p n/f-r Δt 3f Calculating heat loss Q at different temperatures 1/f ，Q 2/f ，Q 3/f ………Q n/f 。
10 Q) will be 1/f ，Q 2/f ，Q 3/f ………Q n/f For DeltaT 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f Binomial q=d×Δt is performed max 2 Fitting, and storing a curve fitting formula into software for standby.
11 Setting the working frequency of the energy meter data acquisition device to f 1 And measuring unknown laser energy to find out the maximum temperature difference delta T max And measuring the temperature difference at each time before the maximum point of the temperature difference And at q=d×Δt max 2 Calculate->According to the formulaThe laser energy is calculated.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (1)
1. A method of compensating for heat loss in a laser energy meter, comprising the steps of:
(1) Measuring a beam splitting ratio a of the beam splitting mirror at the angle, wherein a is the power ratio of reflected light to projected light;
(2) Turning on the laser, and measuring the power value P of the reflected light by using the laser power and light emitting time monitoring device 1 ；
(3) According to formula P 2 ＝P 1 A, estimating the transmitted light power;
(4) According to the measuring range designed by the laser energy meter, according to the formula t=e Is provided with /P 2 Calculating the longest laser time t max ，E Is provided with A measuring range designed for the laser energy meter;
(5) Setting the working frequency of the energy meter data acquisition device as f, and finding out the maximum temperature difference delta T in measurement max And measuring the temperature difference DeltaT at each time before the maximum point of the temperature difference 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f ；
(6) The accurate light emitting time t of each laser and the light emitting rate P, t of each light emitting are measured by a laser power and light emitting time monitoring device<t max ；
(7) Using formula E Measuring Standard laser energy obtained by calculating laser energy at n/f time by p×n/f, E n/f measurement ；
(8) By r=e 1/f measurement /ΔT 1/f Calculating an energy meter coefficient r;
(9) According to the formula q=p n/f-r Δt n/f Calculating heat loss Q at different temperatures 1/f ，Q 2/f ，Q 3/f ………Q n/f ；
(10) Will Q 1/f ，Q 2/f ，Q 3/f ………Q n/f For DeltaT 1/f ，ΔT 2/f ，ΔT 3/f ………ΔT n/f Binomial q=d×Δt is performed max 2 Fitting, wherein d is a coefficient obtained through fitting, and a curve fitting formula is stored in software for standby;
(11) Setting the working frequency of the energy meter data acquisition device to f 1 And measuring unknown laser energy to find out the maximum temperature difference delta T max And measuring the temperature difference at each time before the maximum point of the temperature difference And at q=d×Δt max 2 Calculate->According to the formulaThe laser energy is calculated.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0875687A (en) * | 1994-09-03 | 1996-03-22 | Chiyoukouon Zairyo Kenkyusho:Kk | Analysis of thermal diffusivity, biot number and specific heat data in laser flush method and apparatus therefor |
| CN103471713A (en) * | 2013-09-16 | 2013-12-25 | 中国工程物理研究院应用电子学研究所 | Measurement device, with step-shaped cone, absorbing all energy of high-energy laser |
| CN103776529A (en) * | 2014-02-10 | 2014-05-07 | 南京吉隆光纤通信股份有限公司 | Desktop laser power meter capable of real-time compensation and compensation method thereof |
| CN104048754A (en) * | 2014-05-21 | 2014-09-17 | 西北核技术研究所 | Photothermal effect correcting method of light guide type detector in laser parameter measurement |
| CN104833418A (en) * | 2015-05-13 | 2015-08-12 | 西安交通大学 | Method for measuring laser energy density and total energy by use of mall-measuring-range energy meter |
| CN105181131A (en) * | 2015-07-28 | 2015-12-23 | 哈尔滨工程大学 | Laser power measuring method |
| CN105606214A (en) * | 2015-12-28 | 2016-05-25 | 湖南华曙高科技有限责任公司 | Device for calibrating laser power and method |
| CN111521283A (en) * | 2020-05-19 | 2020-08-11 | 宝宇(武汉)激光技术有限公司 | Laser wavelength and power monitoring device and method |
-
2021
- 2021-06-28 CN CN202110719524.6A patent/CN113375795B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0875687A (en) * | 1994-09-03 | 1996-03-22 | Chiyoukouon Zairyo Kenkyusho:Kk | Analysis of thermal diffusivity, biot number and specific heat data in laser flush method and apparatus therefor |
| CN103471713A (en) * | 2013-09-16 | 2013-12-25 | 中国工程物理研究院应用电子学研究所 | Measurement device, with step-shaped cone, absorbing all energy of high-energy laser |
| CN103776529A (en) * | 2014-02-10 | 2014-05-07 | 南京吉隆光纤通信股份有限公司 | Desktop laser power meter capable of real-time compensation and compensation method thereof |
| CN104048754A (en) * | 2014-05-21 | 2014-09-17 | 西北核技术研究所 | Photothermal effect correcting method of light guide type detector in laser parameter measurement |
| CN104833418A (en) * | 2015-05-13 | 2015-08-12 | 西安交通大学 | Method for measuring laser energy density and total energy by use of mall-measuring-range energy meter |
| CN105181131A (en) * | 2015-07-28 | 2015-12-23 | 哈尔滨工程大学 | Laser power measuring method |
| CN105606214A (en) * | 2015-12-28 | 2016-05-25 | 湖南华曙高科技有限责任公司 | Device for calibrating laser power and method |
| CN111521283A (en) * | 2020-05-19 | 2020-08-11 | 宝宇(武汉)激光技术有限公司 | Laser wavelength and power monitoring device and method |
Non-Patent Citations (1)
| Title |
|---|
| 量热式激光能量计热损失系数测定方法的研究;吴遥;黎高平;于帅;吴磊;;应用光学(第03期);第398-402页 * |
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