CN103674492B - Automatic darkening welding filter lens diffused light reduction luminance factor measuring method - Google Patents
Automatic darkening welding filter lens diffused light reduction luminance factor measuring method Download PDFInfo
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- CN103674492B CN103674492B CN201310638494.1A CN201310638494A CN103674492B CN 103674492 B CN103674492 B CN 103674492B CN 201310638494 A CN201310638494 A CN 201310638494A CN 103674492 B CN103674492 B CN 103674492B
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Abstract
The invention discloses a kind of automatic darkening welding filter lens diffused light reduction luminance factor measuring method, step one, setting up and the setting of bright state shade number of measurement apparatus；Step 2, obtains the instrument and sample total reduction luminance factor set under shade number；Step 3, the reduction luminance factor of the instrument under obtaining step two shade number；Step 4, calculates the sample brightness reduction coefficient l* self produced under this shade number according to the following formula, and its expression formula is: l*=l*g l*a；Step 5, increased the shade number of sample by the shade number adjusting knob of sample, repeat step 2 to step 4, calculating sample diffused light reduction luminance factor under each shade number, as shade number ＞ 7, the shade number of sample needs to utilize and triggers after light source triggers and could set.The invention has the beneficial effects as follows: can measure the brightness reduction coefficient of the diffused light through automatic darkening welding filter lens according to national standard, and can get rid of the impact of instrument self, certainty of measurement is high.
Description
Technical field
The present invention relates to a kind of protective gear when weld job, particularly to a kind of automatic beam change weldering
Connect the measuring method of filter lens diffused light reduction luminance factor.
Background technology
When weld job, a large amount of ultraviolet, infrared ray, high light injury eyes can be produced.Therefore people
Develop automatic darkening welding filter lens to protect welder.Automatic darkening welding filter lens is by arc light sensor
Device, light valve, control circuit, power supply, framework, inside and outside screening glass etc. form, by the initiation of arc light and
Extinguish automatically control filter lens shade number conversion, it is achieved dark and bright states change, thus be effectively improved right
The protection of labourer and work efficiency.
As it is shown in figure 1, when a branch of directional light front illuminated automatic darkening welding filter lens, direction changes
Emergent light be referred to as diffused light.If using lSRepresenting the intensity of diffused light, E represents the illumination of incident illumination,
L=lS/ E represents the characteristic of diffusion.Due to l and transmittance τVRelevant, in order to directly represent the characteristic of diffusion,
Definition l*=l/ τV, the referred to as reduction luminance factor of diffused light.Most automatic darkening welding filter lens produce
Diffused light be symmetrical relative to optical axis, therefore generally measure and optical axis included angle be the diffusion between α to Δ α
Light intensity represents the average level of reduction luminance factor.Typically we select measurement α=1.5 ° to arrive
The diffusion light intensity between solid angle between α+Δ α=2 °.
At present, for diffused light index, China has pointed out one in standard GB/T/T3609.2-2009
Plant measuring method.The step of this method is: the first non-diffuse light of measuring samples；Secondly, measure
The diffused light that amount device is total with sample；Then, measure the diffused light of measurement apparatus, thus obtain sample
Diffused light；Finally calculate the reduction luminance factor of sample.This method needs to use high pressure xenon lamp dough-making powder
Long-pending bigger spherical concave and convex mirrors, causes this measuring method structure complexity, volume relatively big, builds and debug system
Uniting very inconvenient, have significant limitation the most in actual applications, this result also in the market
Diffused light measuring instrument little.Visible, a kind of volume of proposition is little, easy to use, measurement is overflow accurately
The measuring method penetrating light is the most necessary.
Summary of the invention
The technical problem to be solved is to provide one can measure automatic beam change welding optical filtering
The method of mirror diffused light reduction luminance factor.
The technical solution adopted in the present invention is: a kind of automatic darkening welding filter lens diffused light reduction brightness
Coefficient measuring method, step one, setting up and the setting of bright state shade number of measurement apparatus；Step 2, obtains
Take the instrument and sample total reduction luminance factor set under shade number；Step 3, obtaining step two shade number
Under the reduction luminance factor of instrument；Step 4, calculate according to the following formula sample under this shade number from
The brightness reduction coefficient l* that body produces, its expression formula is: l*=l*g-l*a；Step 5, passes through sample
Shade number adjusting knob increase the shade number of sample, repeat step 2 to step 4, calculating sample is in each screening
Diffused light reduction luminance factor under light number, as shade number ＞ 7, the shade number of sample needs to utilize and touches
Luminous source could set after triggering.
Described step one, same optical axis is sequentially arranged light source, sample, annular diaphragm, convex lens and
Photodetector, regional imaging that sample is irradiated with a laser on photodetector, is triggered by convex lens
The arc photosensor of source alignment sample, sets the minimum shading of sample by the shade number adjusting knob of sample
Number.
Described step 2, opens light source, and laser is on sample irradiation to annular diaphragm, and planoconvex lens converges
Gathering on photodetector, the light intensity that photodetector records is diffusion light intensity φ1R, annular diaphragm is changed
Circular diaphragm, measures light intensity φ received by photodetector1L, only allow by light due to circular iris
Light near axle, therefore what photodetector received is the light intensity of non-diffused light, and calculating according to the following formula should
The reduction luminance factor l*g of the diffused light that sample under shade number is total, its expression formula is:
L*g=(1/ ω) * (φ1R/φ1L), wherein: ω is the solid angle determined by annular diaphragm, take α=1.5 ° and arrive
Solid angle between α+Δ α=2 °.
Described step 3, removes sample, measures non-diffuse light intensity φ of this instrument2L, circular iris is changed into
Annular diaphragm, measures diffusion light intensity φ of this instrument2R, calculate the pact of the diffused light of instrument under this shade number
Changing luminance factor l*a, its expression formula is: l*a=(1/ ω) * (φ2R/φ2L)。
Trigger light source just the arc photosensor above sample to be arranged, send pulsed infrared light, make sample
It is in dark-state.
Described sample distance circular iris or annular diaphragm are 400 ± 2mm；The logical light diameter of circular iris
For 10mm；Annular diaphragm annular diameters 21.0 ± 0.1mm；Outer annular diameter 28.0 ± 0.1mm.
Described light source is LASER Light Source, and wave-length coverage is 600 ± 70nm, and the angle of divergence is less than 1mrad, light
Spot diameter is 2-3mm.
Described triggering light source is modulated infrared light source, opens triggering light source and sample can be made to be in dark-state shading
Under number, use infrared LED.
The invention has the beneficial effects as follows: can measure according to national standard and filter through automatic beam change welding
The brightness reduction coefficient of the diffused light of mirror, and the impact of instrument self can be got rid of, certainty of measurement is high.
Accompanying drawing explanation
Fig. 1 is the scattered light schematic diagram by automatic darkening welding filter lens；
Fig. 2 is the measurement system structure schematic diagram of the present invention.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
Fig. 2 is the automatic darkening welding filter lens diffused light test system structure figure of the present invention, as it can be seen,
Including: be sequentially arranged measure light source 1, trigger light source 2, with holding frame sample 3, prop up with diaphragm
The circular iris 6 of frame or annular diaphragm 5, convex lens 8, photodetector 9, acquisition control circuit calculating
Machine, device base plate and casing are constituted；Wherein, light source 1, sample 3, annular diaphragm 5, circular light are measured
Door screen 6, convex lens 8, photodetector 9 is fixed on device base plate by its support respectively, is in same
On optical axis；Sample 3 is clamped by sample clamping frame；Trigger light source 2 and be pressed in the arc light biography of sample 3 self band
On sensor, the pulsed infrared light sent can make sample 3 be in dark-state；Annular diaphragm 5 can and circular
Diaphragm 6 exchanges, and is arranged on apertured bracket.Described measurement light source 1 includes laser instrument, support, power supply,
Laser instrument used is 532nm semiconductor laser, and emergent light spot is 2.5mm, and the angle of divergence is less than 1mrad,
Power is 6mw, and power supply 1-3 used is 5V power supply, and laser instrument is fixed on support, and support passes through spiral shell
Nail is fixed on device base plate, and sample 3 is 400 ± 2mm apart from circular iris 6 or annular diaphragm 5；
The a diameter of 10mm of logical light of circular iris 6, annular diaphragm 5 annular diameters 21.0 ± 0.1mm, outer shroud is straight
Footpath 28.0 ± 0.1mm, uncertainty is less than 0.01mm；Convex lens 8 will be irradiated with a laser on sample 3
Regional imaging on photodetector 9；The output signal of photodetector by computer through data acquisition
Control circuit gathers；Trigger light source 2 to be triggered through data acquiring control circuit by computer.
Circular iris 6 is detachable and can exchange with annular diaphragm 5, and convex lens 8 will be swashed on sample 3
The regional imaging that light irradiates is on photodetector 9；Trigger light source 2 just the arc light above sample 3 to be passed
Sensor, sends pulsed infrared light, makes sample 3 be in dark-state.
When selecting measurement α=1.5 ° to arrive the diffused light between the solid angle between α+Δ α=2 °, sample 3
Distance circular iris 6 or annular diaphragm 5 are 400mm ± 2；The a diameter of 10mm of logical light of circular iris 6,
Annular diaphragm 5 annular diameters 21.0 ± 0.1mm, outer annular diameter 28.0 ± 0.1mm, uncertainty is less than
0.01mm；Thus can measure α=1.5 ° and arrive the diffusion light intensity between the solid angle between α+Δ α=2 °.
Measuring light source 1 wave-length coverage is 600 ± 70nm, and the angle of divergence is less than 1mrad, and spot diameter is
2-3mm。
Triggering light source 2 is modulated infrared light source, opens triggering light source 2 and sample 3 can be made to be in dark-state screening
Under light number, it is possible to use infrared LED.
Step one, setting up and the setting of bright state shade number of measurement apparatus: be sequentially arranged on same optical axis
Measuring light source 1, sample 3, annular diaphragm 5, convex lens 8 and photodetector 9, convex lens 8 is by sample
The regional imaging being irradiated with a laser on product 3, on photodetector 9, triggers light source 2 and is directed at sample 3
Arc photosensor, sets the minimum shade number of sample 3 by the shade number adjusting knob of sample 3；
Step 2: obtain the total reduction luminance factor set under shade number: open measurement light source 1, laser
Being irradiated on annular diaphragm 5 through sample 3, planoconvex lens 8 converges on photodetector 9, photoelectricity
The light intensity that detector 9 records is diffusion light intensity φ1R, annular diaphragm 5 is changed into circular iris 6, measures
Light intensity φ received by photodetector 91L, owing to circular iris 6 allows by the light near optical axis,
Therefore what photodetector 9 received is the light intensity of non-diffused light, calculates according to the following formula under this shade number
The reduction luminance factor l*g of the diffused light that sample is total, its expression formula is: l*g=(1/ ω) * (φ1R/φ1L), its
In: ω is the solid angle determined by annular diaphragm, typically takes α=1.5 ° and arrives the solid between α+Δ α=2 °
Angle；
Step 3: obtain the reduction luminance factor of the instrument under this shade number: remove sample 3, measuring should
Non-diffuse light intensity φ of instrument2L, change circular iris 6 into annular diaphragm 5, measure the diffused light of this instrument
Strong φ2R, calculating the reduction luminance factor l*a of the diffused light of instrument under this shade number, its expression formula is:
L*a=(1/ ω) * (φ2R/φ2L)
Step 4: calculate the sample 3 brightness reduction system self produced under this shade number according to the following formula
Number l*, its expression formula is: l*=l*g-l*a；
Repetition step 2, to step 4, calculates sample diffused light reduction luminance factor under each shade number,
The shade number of sample 3, as shade number ＞ 7, sample is increased by the shade number adjusting knob of sample 3
Shade number needs to utilize and triggers after light source 2 triggers and could set.
The present invention can measure the diffused light through automatic darkening welding filter lens according to national standard
Brightness reduction coefficient, and the impact of instrument self can be got rid of, certainty of measurement is high.
Claims (7)
1. an automatic darkening welding filter lens diffused light reduction luminance factor measuring method, its feature exists
In:
Step one, setting up and the setting of bright state shade number of measurement apparatus；
Step 2, obtains the instrument and sample total reduction luminance factor l*g set under shade number；
Step 3, the reduction luminance factor l*a of the instrument under obtaining step two shade number；
Step 4, calculates the sample reduction luminance factor self produced under this shade number according to the following formula
L*, its expression formula is: l*=l*g-l*a；
Step 5, increases the shade number of sample by the shade number adjusting knob of sample, repeats step 2 to step
Rapid four, calculate sample diffused light reduction luminance factor under each shade number, as shade number ＞ 7, sample
The shade number of product needs to utilize and triggers after light source triggers and could set,
Described step one, sequentially arranges light source (1), sample (3), annular diaphragm on same optical axis
(5), convex lens (8) and photodetector (9), convex lens (8) will be swashed on sample (3)
The regional imaging that light irradiates, on photodetector (9), triggers light source (2) alignment sample (3)
Arc photosensor, sets the minimum shade number of sample (3) by the shade number adjusting knob of sample (3).
Automatic darkening welding filter lens diffused light reduction luminance factor the most according to claim 1 is surveyed
Metering method, it is characterised in that: described step 2, open light source (1), laser shines through sample (3)
Being mapped on annular diaphragm (5), planoconvex lens (8) converges on photodetector (9), light electrical resistivity survey
The light intensity that survey device (9) records is diffusion light intensity φ1R, change annular diaphragm (5) into circular iris (6),
Measure light intensity φ received by photodetector (9)1L, owing to circular iris (6) only allows by light
Light near axle, therefore what photodetector (9) received is the light intensity of non-diffused light, according to the following formula
Calculating the reduction luminance factor l*g of the total diffused light of the sample under this shade number, its expression formula is:
L*g=(1/ ω) * (φ1R/φ1L), wherein: ω is the solid angle determined by annular diaphragm, take α=1.5 ° and arrive
Solid angle between α+Δ α=2 °.
Automatic darkening welding filter lens diffused light reduction luminance factor the most according to claim 1 is surveyed
Metering method, it is characterised in that: described step 3, remove sample (3), measure the non-diffuse of this instrument
Light intensity φ2L, change circular iris (6) into annular diaphragm (5), measure diffusion light intensity φ of this instrument2R,
Calculating the reduction luminance factor l*a of the diffused light of instrument under this shade number, its expression formula is:
L*a=(1/ ω) * (φ2R/φ2L), ω is the solid angle determined by annular diaphragm, take α=1.5 ° to α+Δ α=2 ° it
Between solid angle.
Automatic darkening welding filter lens diffused light reduction luminance factor the most according to claim 1 is surveyed
Metering method, it is characterised in that: described step 5, triggers light source (2) just to the above arc of sample (3)
Optical sensor is arranged, and sends pulsed infrared light, makes sample (3) be in dark-state.
5. according to the automatic darkening welding filter lens diffused light reduction described in any one of claim 2 to 4
Luminance factor measuring method, it is characterised in that: described sample (3) distance circular iris (6) or annular
Diaphragm (5) is 400 ± 2mm；The a diameter of 10mm of logical light of circular iris (6)；Annular diaphragm (5)
Annular diameters 21.0 ± 0.1mm；Outer annular diameter 28.0 ± 0.1mm.
Automatic darkening welding filter lens the most according to claim 1 and 2 diffused light reduction brightness system
Number measuring method, it is characterised in that: described light source (1) is LASER Light Source, and wave-length coverage is 600 ± 70nm,
The angle of divergence is less than 1mrad, and spot diameter is 2-3mm.
7. according to the automatic darkening welding filter lens diffused light reduction brightness system described in claim 2 or 4
Number measuring method, it is characterised in that: described triggering light source (2) is modulated infrared light source, opens triggering
Light source (2) makes sample (3) be under dark-state shade number, triggers light source (2) and uses infrared LED.
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| CN201310638494.1A CN103674492B (en) | 2013-11-29 | 2013-11-29 | Automatic darkening welding filter lens diffused light reduction luminance factor measuring method |
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| CN105334025B (en) * | 2015-09-22 | 2017-12-08 | 天津大学 | A kind of automatic darkening welding filter lens diffused light reduction luminance factor measuring method |
| CN105447181B (en) * | 2015-12-15 | 2020-06-09 | 中智城信息科技（苏州）有限公司 | Material simplified brightness coefficient data organization method for illumination design computing platform |
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Inventor after: Liu Qinggang Inventor after: Guo Dehua Inventor after: Fan Zhiguo Inventor after: Liu Shiyi Inventor after: Liu Chao Inventor after: Guo Ya Inventor after: Yu Xue Inventor before: Liu Qinggang Inventor before: Guo Dehua Inventor before: Fan Zhiguo Inventor before: Liu Shiyi Inventor before: Liu Chao Inventor before: Guo Ya Inventor before: Yu Xue |
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