CN106568720B - A kind of metal specimen surface laser measuring apparatus for reflection index and method - Google Patents
A kind of metal specimen surface laser measuring apparatus for reflection index and method Download PDFInfo
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Abstract
The invention belongs to laser effect the field of test technology, it is related to a kind of metal specimen surface reflectivity measuring device and method.Device provided by the invention includes measuring integrating sphere and background integrating sphere, and the junction of measurement integrating sphere and background integrating sphere is provided with the test specimen mounting hole of perforation；Measurement photodetector is installed on measurement integrating sphere, background photodetector is installed in background integrating sphere；Laser is additionally provided on measurement integrating sphere and enters hole, and laser enters hole and is located on the other side ball wall opposite with test specimen mounting hole.The integrating sphere group that the present invention passes through setting string shape, measuring signal and thermal background emission signal are obtained using measurement integrating sphere and background integrating sphere respectively, true reflectivity factor is obtained by data processing, overcomes influence of the thermal radiation signal to albedo measurement at high temperature of metal specimen surface.
Description
Technical field
The invention belongs to laser effect the field of test technology, it is related to a kind of metal specimen surface reflectivity measuring device and side
Method.
Background technique
When Study of Laser and metal material Coupling Rule, it usually needs measurement obtains the surface reflection rate coefficient of effect test specimen
With laser power and out light when long relationship.More common method is integrating sphere measurement scheme as shown in Figure 1: the first step will
Standard test panel is placed on inside integrating sphere 4, and measurement obtains the sound of photodetector 5 of the load of laser 1 in standard test panel
Effect test specimen 3 is placed on inside integrating sphere 4 by induction signal, second step, and measurement obtains the load of laser 1 in the photoelectricity of effect test specimen 3
The response signal of detector 5, the two is compared to the surface reflection rate coefficient for being effect test specimen 3.In practical applications due to effect
Test specimen temperature during Laser shock loading increases, and external heat radiation is reinforced, and this part thermal radiation signal can be aliasing in effective letter
The photodetector measurement being integrated on ball in number, influences the accuracy of measurement result, especially when test specimen is by Laser shock loading
When to high temperature, the error of albedo measurement is become very large.
Document " heat radiation influence and its removing method, light laser and the particle beams in albedo measurement, 2011, Vol.23
(7), p1767-1770 " discloses a kind of integral ball measurement method of double detector to eliminate metal material heat radiation to reflectivity
The method for measuring interference is irradiated using the laser beam of 1064nm laser transmitting in metal material surface, metal material surface
Reflected light and heat radiation are integrated ball and collect and homogenize, and the first photodetector and the second photodetector are used to measure after homogenizing
Light intensity, it is narrow equipped with 1319nm before the second photodetector wherein be equipped with 1064nm narrow band filter before the first photodetector
Band optical filter.When the reflectivity of measuring metallic materials, acquisition Laser shock loading process metal material heating-up time section and Laser shock loading
Later in temperature fall time section the first photodetector and the second photodetector signal, dropped using metal material after Laser shock loading
The data of warm the first photodetector of period and the second photodetector are demarcated, and calibration relation curve is obtained.It recycles
The measurement data of the second photodetector finds out the component of heat radiation in the first photodetector in Laser shock loading section, then finds out
Reflectance component in the first photodetector of Laser shock loading section.Document the method has ignored metal material heating and temperature-fall period
The variation of emissivity caused by middle surface oxidation, the heat radiation calibration curve of temperature descending section theoretically cannot strictly describe the heat of warming-up section
Radiation signal brings biggish uncertainty of measurement.
Summary of the invention
In order to solve the technical problem of existing effect surface of test piece method for measuring reflectance measurement result inaccuracy, this hair
It is bright that a kind of metal specimen surface laser measuring apparatus for reflection index and method for overcoming thermal radiation signal interference is provided.
The technical solution of the invention is as follows: a kind of metal specimen surface laser measuring apparatus for reflection index, special character
Be: including measurement integrating sphere and background integrating sphere, the junction of the measurement integrating sphere and background integrating sphere is provided with perforation
Test specimen mounting hole；Measurement photodetector is installed on the measurement integrating sphere, installs and has powerful connections in the background integrating sphere
Photodetector；It is additionally provided with laser on the measurement integrating sphere and enters hole, the laser enters hole positioned at opposite with test specimen mounting hole
Other side ball wall on.
Above-mentioned measurement integrating sphere and background integrating sphere are an integral structure, and are provided on the ball wall at the test specimen mounting hole
Test specimen mounting groove.
The structure size and inner surface treatment process of above-mentioned measurement integrating sphere and background integrating sphere are all the same.
The present invention also provides a kind of metal specimen surface laser method for measuring reflectance, be characterized in that including with
Lower step:
1] laser alignment laser is entered into hole, sets long T when laser power P and out light；
2] standard test panel is placed on test specimen mounting hole, loads laser；
3] record measurement photodetector changes with time signal V0s(t) it changes with time with background photodetector
Signal V0b(t)；Then, laser is closed, standard test panel is removed；
4] metal specimen to be measured is placed on test specimen mounting hole, loads laser；
5] record measurement photodetector changes with time signal V1s(t) it changes with time with background photodetector
Signal V1b(t)；Then, laser is closed, metal specimen to be measured is removed；
6] according to formula k=(V1s(t)-V1b(t))/(V0s(t)-V0b(t)) it is under P-condition that laser power, which is calculated,
Metal specimen surface reflectivity coefficient k；
7] change long T when Laser shock loading power P and out light, repeat step 1-6] obtain the gold under different input conditions
Belong to surface of test piece reflectivity factor k；
8] metal specimen surface reflectivity coefficient k is multiplied to obtain metal specimen to be measured with the reflectivity of standard test panel
Surface laser reflectivity.
Above-mentioned standard test board is inert metal plate or inorganic material plate known to reflectivity.
Preferably, the angle of the normal direction of the laser light incident direction of laser and standard test panel or metal specimen to be measured
For α, wherein 0 ° of α≤8 ° ﹤.
Above-mentioned metal specimen to be measured is the flake structure that thickness is less than 5mm.
Two surfaces of above-mentioned metal specimen to be measured are made of identical treatment process.
The beneficial effects of the present invention are:
(1) metal specimen is prepared into flake, front and rear surfaces original state having the same, in identical temperature by the present invention
The state of oxidation having the same under degree course makes metal specimen front and rear surfaces temperature rise having the same during laser irradiation
Journey, thus thermal radiation signal having the same, by the integrating sphere group of setting string shape, using measurement integrating sphere and background integrating sphere
Measuring signal and thermal background emission signal are obtained respectively, are obtained true reflectivity factor by data processing, are overcome metal
Surface of test piece influence of the thermal radiation signal to albedo measurement at high temperature.
(2) this measuring device and method are suitable for different laser target surface light spot shapes and light distribution, in the measurements not
Using optical filter, have it is easy to operate, it is applied widely, lay the convenient feature of test specimen, be particularly suitable for high-volume test specimen
Measurement calibration.
Detailed description of the invention
Fig. 1 is traditional metal specimen surface laser measuring apparatus for reflection index figure；
Fig. 2 is the metal specimen surface laser measuring apparatus for reflection index figure of present pre-ferred embodiments.
Wherein, appended drawing reference is as follows: 1- laser, 2- laser beam, 3- metal specimen, 4- integrating sphere, 41- measurement integral
Ball, 42- background integrating sphere, 5- photodetector, 51- measure photodetector, 52- background photodetector, the installation of 6- test specimen
Hole, 7- laser enter hole.
Specific embodiment
The present invention provides a kind of metal specimen surface laser measuring apparatus for reflection index and methods, pass through setting measurement integral
Ball and background integrating sphere obtain measuring signal and thermal background emission signal respectively, and data processing obtains true reflectivity factor,
Overcome influence of the thermal radiation signal to measurement result at high temperature of metal specimen surface.The preferable implementation of measuring device of the present invention
Example structure is as shown in Fig. 2, include that the measurement integrating sphere 41 being disposed proximate to and background integrating sphere 42, the two junction are provided with perforation
Test specimen mounting hole 6；Test specimen mounting hole 6 is for placing metal specimen or standard test panel to be measured.It measures on integrating sphere 41
Measurement photodetector 51 is installed, background photodetector 52 is installed in background integrating sphere 42；It measures on integrating sphere 41 also
It is provided with laser and enters hole 7, laser enters hole 7 and is located on the other side ball wall opposite with test specimen mounting hole 6.What laser 1 issued swashs
Light beam 2 enters the surface that hole 7 is incident to metal specimen 3 by laser.
Measurement integrating sphere and background integrating sphere can be the split type structure being spliced after individually processing, the two mosaic
It is the test specimen mounting hole inside shared two integrating spheres of perforation.During actual test, first will measurement integrating sphere and
Background integrating sphere is dismantled, after installation (or take out) metal specimen or standard test panel to be measured, then by two integrating sphere splits.
It is more preferred, it measures integrating sphere and background integrating sphere can also be processed as one formula structure, at test specimen mounting hole
Ball wall on be arranged a test specimen mounting groove.When needing to test, by metal specimen to be measured or standard test panel insertion test specimen peace
Tankage shelters from test specimen mounting hole completely.After the completion of test, just metal specimen or standard test panel are directly extracted.
In order to eliminate influence of the thermal radiation signal to measurement result at high temperature of metal specimen 3, metal specimen 3 is thin slice
Shape, thickness are no more than 5mm, and two surfaces of metal specimen 3 are made of identical treatment process, it is ensured that two surfaces are externally hot
The signal of radiation is consistent, at the same measure integrating sphere 41 and background integrating sphere 42 structure size and inner surface treatment process it is equal
It is identical, it is ensured that the signal amplitude of acquisition is essentially identical, the signal that measurement integrating sphere 41 obtains in this way be effective reflection signal and
The front surface thermal radiation signal of metal specimen 3, and the signal that background integrating sphere obtains is 3 rear surface heat radiation of metal specimen letter
Number, since metalwork is very thin and process of surface treatment is identical, while measuring the response signal of integrating sphere 41 and background integrating sphere 42
Amplitude is essentially identical, therefore can be subtracted each other with the two and obtain effective reflected measurement signal.
It is provided by the present invention that based on metal specimen surface laser measuring apparatus for reflection index, the specific test method is as follows:
1] the alignment laser of laser 1 is entered into hole 7, sets long T when laser power P and out light.
2] standard test panel is placed on test specimen mounting hole 6, loads laser.The reflectance value of standard test panel it is known and
With stronger anti-laser irradiation stability, generally inert metal plate or inorganic material plate.
3] record measurement photodetector changes with time signal V0s(t) it changes with time with background photodetector
Signal V0b(t)；Then, laser is closed, standard test panel is removed.
4] metal specimen to be measured is placed on test specimen mounting hole, loads laser；The laser light incident direction of laser and mark
The angle of the normal direction of quasi- test board or metal specimen to be measured is α, wherein 0 ° of α≤8 ° ﹤, reduces light losing to the greatest extent.
5] record measurement photodetector changes with time signal V1s(t) it changes with time with background photodetector
Signal V1b(t)；Then, laser is closed, metal specimen to be measured is removed.
6] according to formula k=(V1s(t)-V1b(t))/(V0s(t)-V0b(t)) it is under P-condition that laser power, which is calculated,
Metal specimen surface reflectivity coefficient k.
7] change long T when Laser shock loading power P and out light, repeat step 1-6] obtain the gold under different input conditions
Belong to surface of test piece reflectivity factor k.
8] metal specimen surface reflectivity coefficient k is multiplied to obtain metal specimen to be measured with the reflectivity of standard test panel
Surface laser reflectivity.
The present invention effectively overcomes influence of the heat radiation to albedo measurement result in Laser shock loading, have it is easy to operate,
It is applied widely, lay the convenient feature of test specimen, be particularly suitable for high-volume test specimen measurement calibration.
Claims (6)
1. a kind of metal specimen surface laser method for measuring reflectance, which is characterized in that reflected by metal specimen surface laser
Rate measuring device measures, and the metal specimen surface laser measuring apparatus for reflection index includes measurement integrating sphere and Background Integral
The junction of ball, the measurement integrating sphere and background integrating sphere is provided with the test specimen mounting hole of perforation；On the measurement integrating sphere
Measurement photodetector is installed, background photodetector is installed in the background integrating sphere；On the measurement integrating sphere also
It is provided with laser and enters hole, the laser enters hole and is located on the other side ball wall opposite with test specimen mounting hole；Measurement method include with
Lower step:
1] laser alignment laser is entered into hole, sets long T when laser power P and out light；
2] standard test panel is placed on test specimen mounting hole, loads laser；
3] record measurement photodetector changes with time signal V0s(t) change with time signal with background photodetector
V0b(t)；Then, laser is closed, standard test panel is removed；
4] metal specimen to be measured is placed on test specimen mounting hole, loads laser；The metal specimen to be measured is that thickness is less than 5mm
Flake structure；
5] record measurement photodetector changes with time signal V1s(t) change with time signal with background photodetector
V1b(t)；Then, laser is closed, metal specimen to be measured is removed；
6] according to formula k=(V1s(t)-V1b(t))/(V0s(t)-V0b(t)) it is the metal under P-condition that laser power, which is calculated,
Surface of test piece reflectivity factor k；
7] change long T when Laser shock loading power P and out light, repeat step 1-6] obtain the metal examination under different input conditions
Part surface reflectivity coefficient k；
8] metal specimen surface reflectivity coefficient k is multiplied to obtain the surface of metal specimen to be measured with the reflectivity of standard test panel
Laser reflectivity.
2. metal specimen surface laser method for measuring reflectance according to claim 1, it is characterised in that: the standard is surveyed
Test plate (panel) is inert metal plate or inorganic material plate known to reflectivity.
3. metal specimen surface laser method for measuring reflectance according to claim 1 or 2, it is characterised in that: laser
Laser light incident direction and the angle of normal direction of standard test panel or metal specimen to be measured be α, wherein 0 ° of α≤8 ° ﹤.
4. metal specimen surface laser method for measuring reflectance according to claim 3, it is characterised in that: the gold to be measured
Two surfaces for belonging to test specimen are made of identical treatment process.
5. metal specimen surface laser measuring apparatus for reflection index according to claim 4, it is characterised in that: the measurement product
Bulb separation and background integrating sphere are an integral structure, and are provided with test specimen mounting groove on the ball wall at the test specimen mounting hole.
6. metal specimen surface laser measuring apparatus for reflection index according to claim 5, it is characterised in that: the measurement product
The structure size and inner surface treatment process of bulb separation and background integrating sphere are all the same.
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| CN2174687Y (en) * | 1993-09-27 | 1994-08-17 | 南京理工大学 | Portable device for monitoring crops growing |
| CN1699973A (en) * | 2005-04-28 | 2005-11-23 | 天津市先石光学技术有限公司 | Method for realizing concentration measurement by employing flotation benchmarks |
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| CN101446548A (en) * | 2008-12-23 | 2009-06-03 | 天津大学 | Device for realizing measurement of milk ingredient based on response conversion and method thereof |
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