CN103148948B - Device for measuring high-energy laser energy - Google Patents
Device for measuring high-energy laser energy Download PDFInfo
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- CN103148948B CN103148948B CN201310048553.XA CN201310048553A CN103148948B CN 103148948 B CN103148948 B CN 103148948B CN 201310048553 A CN201310048553 A CN 201310048553A CN 103148948 B CN103148948 B CN 103148948B
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Abstract
The invention discloses a device for measuring high-energy laser energy. The device for measuring the high-energy laser energy comprises a heat absorption body, a collection cover, a temperature measuring unit and a temperature acquisition and processing unit, wherein the collection cover is arranged on the exterior of the heat absorption body; an airtight cavity is formed between the collection cover and a light-showing face of the heat absorption body; the internal surface of a cavity body of the airtight cavity is treated as a diffusely reflecting surface; the temperature measuring unit is arranged on the heat absorption body and the collection cover; a light pass hole is formed in the direction of the light-showing face of the collection cover; a posture adjustment unit is arranged below the collection cover; and during the process of emitting light, the horizontal position, the elevation position and the incident angle about the incidence of high-energy laser to the heat absorption body can be changed. The device for measuring the high-energy laser energy adopts a mode that a laser beam circularly scans the surface of the heat absorption body, so that the partial surface of the heat absorption body is prevented from persistently bearing strong laser irradiation, the power density of average laser irradiated onto the surface of the heat absorption body is decreased, and a laser damage resistance threshold value of a measuring system is improved.
Description
Technical field
The present invention relates to a kind of device measured for photo-thermal method energy measurement of high energy laser, be especially a kind ofly applicable to device that is long-time, the absolute measurement of macro-energy superlaser.
Background technology
In superlaser parameter measurement, laser gross energy is one is substantially the most also of paramount importance index parameter, normal employing photo-thermal method is measured, be incident on absorber that the materials such as graphite make by laser, absorber absorbs the energy of incident laser and changes into self temperature rise, by measuring temperature rise thus calculating the gross energy obtaining superlaser.Along with the development of superlaser technology, high power, when growing light between laser instrument become the direction of various countries' develop actively, the laser instrument that current light power megawatt, bright dipping duration reach minute magnitude is also about to become possibility, and the Measurement accuracy how realizing its parameter has become the restraining factors of high-energy laser of future generation development.
Existing hypersorption energy meter is in energy measurement of high energy laser is measured, absorber sensitive surface is owing to will bear whole long-time laser irradiation, its resisting laser damage and damage capability will become its technical bottleneck, the normal method adopted has at present: (1) water circulation heat conduction, as early as possible heat is passed to out, this scheme can reduce the temperature rise of absorber after thermal equilibrium, but cannot solve laser irradiation to during absorber to the destruction of absorber surface, and need to increase circulation waterway in energy measuring apparatus, structural complexity and cost certainly will be increased; (2) at anti-laser irradiation films such as absorber surface spraying plating silit, the ability that this scheme improves damage threshold is also very limited, and adds the complicacy of system.Along with the prolongation of significantly lifting and the bright dipping time of laser power density, how to improve the gordian technique that the anti-laser-damaged threshold value of absorber becomes measuring system, be badly in need of wanting new thinking go to solve.
Summary of the invention
The object of this invention is to provide a kind of energy measurement of high energy laser measurement mechanism of high destructive threshold value, by attitude regulating member, the heat absorbing body of energy measuring apparatus is carried out to the position adjustments of laser irradiated surface, just heat absorbing body local surfaces is avoided in routine measurement to bear high light irradiation and the absorber that causes destroys, greatly reduce irradiation to the average laser power density on heat absorbing body surface, improve the anti-laser-damaged threshold value of absorber.
Technical scheme of the present invention is as follows:
A kind of energy measurement of high energy laser measurement mechanism, comprise heat absorbing body, collecting hood, temperature measuring unit and temperature acquisition processing unit, be electrically connected between temperature measuring unit and temperature acquisition processing unit, it is characterized in that: described collecting hood is arranged on the outside of heat absorbing body, and define closed cavity between collecting hood and the side to light of heat absorbing body, temperature measuring unit is arranged on heat absorbing body and collecting hood, the side to light direction of collecting hood has light hole, attitude regulation unit is provided with below collecting hood, can go out in photoreduction process, change the horizontal level that superlaser is incident to heat absorbing body, high and low position and incident angle.
The side to light of above-mentioned heat absorbing body is provided with some indent blind holes, the opening direction of described indent blind hole is towards side to light.
Above-mentioned indent blind hole is taper hole or half ball.
The bore d of light hole on above-mentioned collecting hood
1, incident high energy laser beam beam cross section bore d
2, heat absorbing body surface size L, between collecting hood and heat absorbing body, the distance h of cavity meets lower relation of plane:
d
2=(0.3～0.8)d
1；
L=(1.5～2.5)d
1；
h=(0.8～1.2)d
1。
The bore d of light hole on collecting hood
1, incident high energy laser beam beam cross section bore d
2, heat absorbing body (1) surface size L, between collecting hood and heat absorbing body, the distance h of cavity meets lower relation of plane:
d
2=0.5d
1；
L=2.0d
1；
h=1.0d
1。
Above-mentioned superlaser is incident to angle θ=0 ~ 45 ° of heat absorbing body.
Above-mentioned attitude regulation unit makes by the side to light scan round at heat absorbing body of the high energy laser beam of light hole.
Above-mentioned attitude regulation unit comprises level(l)ing mechanism, vertically governor motion and be reference with heat absorbing body side to light direction pitching adjusting mechanism, left-right adjusting mechanism.
Above-mentioned heat absorbing body and collecting hood all adopt graphite to make; The cavity inner surface of described closed cavity is treated to diffuse surface; The surrounding of described heat absorbing body and collecting hood is provided with the thermofin that heat-barrier material is made.
Above-mentioned temperature measuring unit is the thermocouple arrays according to certain space distribution.
The beneficial effect that the present invention has is as follows:
1, the present invention is by the mode on the heat absorbing body surface of laser beam scan round, avoid absorber local surfaces and bear Irradiation of High lastingly, reduce irradiation to the average laser power density on heat absorbing body surface, improve the anti-laser-damaged threshold value of absorber; For laser power density light beam pockety, irradiation is to the local surfaces of absorber always can to avoid the high light spot place of laser, and feature is more obvious.
2, light of the present invention is provided with some taper holes or semicircle orifice on heat absorbing body side to light, further increases laser irradiation area, reduces the average power density of irradiation to absorber surface.
3, the energy measurement of high energy laser measurement mechanism surrounding designed by the present invention is provided with heat-barrier material, reduces thermal loss in measurement, improves measuring accuracy.
4, the present invention adopts computer-controlled attitude regulation mechanism to achieve the scan round of laser beam on heat absorbing body side to light, facilitates onsite application.
5, compared with conventional energy meter, the advantages such as it is little, lightweight that energy measurement of high energy laser measurement mechanism of the present invention has volume, flexible to operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of energy measurement of high energy laser measurement mechanism of the present invention;
Fig. 2 is attitude regulation cellular construction schematic diagram of the present invention;
Fig. 3 is the escape schematic diagram that diffuses adopting ray-tracing software simulation.
Reference numeral is: 1, heat absorbing body; 2, collecting hood; 3, attitude regulation unit; 4; High energy laser beam; 5, closed cavity; 6, thermofin; 7, indent blind hole; 8, light hole; 9, reflection ray.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The invention provides a kind of measurement of laser energy device of high destructive threshold value, by attitude regulation unit 3, laser irradiated surface is carried out to the heat absorbing body 1 of energy measuring apparatus and carries out position adjustments, just heat absorbing body 1 local surfaces is avoided in routine measurement to bear high light irradiation and the absorber that causes destroys, greatly reduce irradiation to the average laser power density on heat absorbing body 1 surface, improve the anti-laser-damaged threshold value of absorber.
As shown in Figure 1, energy measurement of high energy laser measurement mechanism, comprise heat absorbing body 1, collecting hood 2, temperature measuring unit and temperature acquisition processing unit, temperature acquisition processing unit is electrically connected with between temperature measuring unit, for gathering, record temperature value and processing the energy parameter calculating laser.The surrounding of heat absorbing body 1 is provided with collecting hood 2, and heat absorbing body 1 and collecting hood 2 all adopt graphite to make; Collecting hood 2 can adopt the method for overall processing, adopts the bonding all-in-one-piece method of high-temp glue after also can being processed into several parts.The space of reserved certain length between the side to light of collecting hood 2 and heat absorbing body 1, closed cavity 5 is defined like this between collecting hood 2 and the side to light of heat absorbing body 1, the cavity inner surface of closed cavity 5 is treated to diffuse surface, and diffuse surface comprises the inwall of heat absorbing body 1 side to light and protective cover; All be embedded with temperature measuring unit at heat absorbing body 1 and collecting hood 2, temperature measuring unit is generally thermopair, can arrange according to certain space distribution; The side to light direction of collecting hood 2 has light hole 8, injects for superlaser; Be provided with attitude regulation unit 3 below collecting hood 2, can going out in photoreduction process, change superlaser and be incident to the horizontal level of heat absorbing body 1, high and low position and incident angle.For realizing above-mentioned attitude regulation, attitude regulation unit 3 comprise level(l)ing mechanism, vertically governor motion, pitching adjusting mechanism and left-right adjusting mechanism (when with heat absorbing body 1 side to light direction for reference time), wherein pitching adjusting mechanism and left-right adjusting mechanism are for improvement of the incident angle of laser, and meet the requirement of laser beam comprehensive scanning on heat absorbing body 1 side to light.
In order to improve laser-damaged threshold value further, the side to light of heat absorbing body 1 is provided with some indent blind holes 7, as taper hole, its opening direction, towards side to light, can increase laser irradiation area like this, reduces the average power density of irradiation to absorber surface.The present invention is simultaneously provided with thermofin 6 in energy measurement of high energy laser measurement mechanism surrounding, reduces thermal loss in measurement, improves measuring accuracy.Heat-barrier material can adopt the bonding method of high-temperature plastic to bond on collecting hood 2.
As shown in Figure 2, attitude regulation unit 3 mainly comprise horizontally rotate adjustment (realize photothermal measurement unit horizontal angle rotate), height regulates (realizing photothermal measurement unit high and low position to regulate), Level tune (realizing photothermal measurement unit right position to regulate), pitch regulation (realizing photothermal measurement unit luffing angle to regulate).Attitude regulation mechanism adopts computer program to control, and according to the program set, guarantees that high energy laser beam 4 is by can at the laser irradiation scan round formula on the surface irradiation of heat absorbing body 1 after light hole 8.
As shown in Figure 3, calculated the escapement ratio of incident laser and the relation of measurement mechanism size by ray Tracing Simulation of Volume Scattering software TracePro, result of calculation shows: as the bore d of light hole 8 on collecting hood 2
1, incident high energy laser beam 4 beam cross section bore d
2, heat absorbing body 1 surface size L, between collecting hood 2 and heat absorbing body 1, the distance h of cavity meets lower relation of plane:
D
2=(0.3 ~ 0.8) d
1, optimum dimension is d
2=0.5d
1;
L=(1.5 ~ 2.5) d
1, optimum dimension is L=2.0d
1;
H=(0.8 ~ 1.2) d
1, optimum dimension is h=1.0d
1.
Now the light uncertainty of measurement brought of escaping is less than 5 ‰, and in calculating, superlaser is incident to angle θ=0 ~ 45 ° of heat absorbing body 1, and the thermal loss that after have ignored parcel thermal insulation material, photothermal measurement unit brings.
In energy measurement of high energy laser measurement mechanism of the present invention, when incident superlaser arrives photothermal measurement unit, photothermal measurement unit absorbs incident laser energy and transforms self temperature rise, array of temperature sensor is utilized to measure in real time the change of photothermal measurement cell temperature, finally by data acquisition process unit, the temperature signal that array of temperature sensor measurement obtains is recorded and processed, finally obtain the gross energy of incident superlaser.
Take absorbent material as graphite material be example, be estimated as follows the weight of overall system: get graphite specific heat c=1200J/kgk, absorbent material temperature rise Δ T≤300 DEG C, incident laser power P is 1MW, and bright dipping duration t is 30s, then gross energy Δ Q=Pt=10
6w × 30s=30MJ;
According to photothermal deformation formula: mc Δ T=Δ Q
Can obtain heat absorbing body 1 quality of materials m >=83kg, namely the minimum weight of graphite absorbent material is only 83kg, and in addition peripheral irradiation insulating material and shelling machine, its minimum mass of photothermal measurement unit can at about 100kg.Attitude regulation mechanism weight can be designed to about 100kg, and can move flexibly, lays.System total amount can be less than 200kg, and flexible and convenient to use.Compared with realizing with classic method the energy meter (weight on tonne) that macro-energy like this measures, there is obvious advantage.It is little, lightweight that this kind of energy measurement of high energy laser measurement mechanism has volume, flexible to operation, and the thermal absorption material vulnerability avoiding superlaser Long-Duration Exposure and bring and the problem such as uncertainty of measurement is bigger than normal, may be used for higher light power (as MW class laser power), when more growing light between the absolute measurement of energy measurement of high energy laser of (minute level).
The present invention is not limited to above-mentioned embodiment; the making material of such as photothermal measurement unit can select other material beyond graphite material to make; taper hole can be substituted by semicircle orifice; heat absorbing body 1 and protective cover 2 can be circular or square, and the distribution mode of temperature sensor etc. also can change according to actual needs.In addition, the fixing of temperature sensor can adopt the modes such as high-temp glue bonding to complete.More than change, all in protection scope of the present invention.
Claims (6)
1. an energy measurement of high energy laser measurement mechanism, comprise heat absorbing body (1), collecting hood (2), temperature measuring unit and temperature acquisition processing unit, be electrically connected between temperature measuring unit and temperature acquisition processing unit, it is characterized in that: described collecting hood (2) is arranged on the outside of heat absorbing body (1), and define closed cavity (5) between the side to light of collecting hood (2) and heat absorbing body (1), temperature measuring unit is arranged on heat absorbing body (1) and collecting hood (2), the side to light direction of collecting hood (2) has light hole (8), collecting hood (2) below is provided with attitude regulation unit (3), can go out in photoreduction process, change the horizontal level that superlaser is incident to heat absorbing body (1), high and low position and incident angle, the bore d of the upper light hole (8) of collecting hood (2)
1, incident high energy laser beam (4) beam cross section bore d
2, heat absorbing body (1) surface size L, between collecting hood (2) and heat absorbing body (1), the distance h of cavity meets lower relation of plane:
d
2＝(0.3～0.8)d
1；
L＝(1.5～2.5)d
1；
h＝(0.8～1.2)d
1；
Described attitude regulation unit (3) comprises level(l)ing mechanism, vertically governor motion and take heat absorbing body (1) side to light direction as pitching adjusting mechanism, the left-right adjusting mechanism of reference;
Described attitude regulation unit (3) makes by the side to light scan round at heat absorbing body (1) of the high energy laser beam (4) of light hole (8);
Described heat absorbing body (1) and collecting hood (2) all adopt graphite to make; The cavity inner surface of described closed cavity (5) is treated to diffuse surface; The surrounding of described heat absorbing body (1) and collecting hood (2) is provided with the thermofin (6) that heat-barrier material is made.
2. energy measurement of high energy laser measurement mechanism according to claim 1, it is characterized in that: the side to light of described heat absorbing body (1) is provided with some indent blind holes (7), the opening direction of described indent blind hole (7) is towards side to light.
3. energy measurement of high energy laser measurement mechanism according to claim 2, is characterized in that: described indent blind hole (7) is taper hole or half ball.
4. energy measurement of high energy laser measurement mechanism according to claim 1, is characterized in that: the bore d of the upper light hole (8) of collecting hood (2)
1, incident high energy laser beam (4) beam cross section bore d
2,heat absorbing body (1) surface size L, between collecting hood (2) and heat absorbing body (1), the distance h of cavity meets lower relation of plane:
d
2＝0.5d
1；
L＝2.0d
1；
h＝1.0d
1。
5. energy measurement of high energy laser measurement mechanism according to claim 1, is characterized in that: described superlaser is incident to angle θ=0 ~ 45 ° of heat absorbing body (1).
6. energy measurement of high energy laser measurement mechanism according to claim 1, is characterized in that: described temperature measuring unit is the thermocouple arrays according to certain space distribution.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103471713B (en) * | 2013-09-16 | 2015-06-10 | 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 |
| CN103630236B (en) * | 2013-12-11 | 2015-12-02 | 中国工程物理研究院应用电子学研究所 | A kind of conical cavity type high-energy laser total-absorption energy meter |
| CN104165690B (en) * | 2014-09-04 | 2016-01-20 | 中国工程物理研究院应用电子学研究所 | A kind of High Energy Laser Energy Meter calibrating installation |
| CN104931135B (en) * | 2015-06-29 | 2017-03-29 | 中国工程物理研究院激光聚变研究中心 | A kind of laser energy meter probe |
| CN105606214B (en) * | 2015-12-28 | 2018-05-18 | 湖南华曙高科技有限责任公司 | Calibrate the devices and methods therefor of laser power |
| CN108827463B (en) * | 2018-06-19 | 2020-05-08 | 中国工程物理研究院应用电子学研究所 | Immersion type full-absorption high-energy laser power energy meter |
| CN109029715A (en) * | 2018-09-28 | 2018-12-18 | 中国人民解放军国防科技大学 | Large-caliber broadband optical power measuring device and working method thereof |
| CN114608700A (en) * | 2022-02-28 | 2022-06-10 | 西北核技术研究所 | Laser energy measuring device and method based on quantitative water direct absorption |
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| JP2001317995A (en) * | 2000-05-08 | 2001-11-16 | Nippon Steel Corp | Power damper for high power lasers, laser power meter and laser power measuring method |
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| CN102419214A (en) * | 2011-08-15 | 2012-04-18 | 西北核技术研究所 | Photo-thermal/photo-electrical composite high-energy laser parameter measurement device |
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