CN102445325A - Device and method for measuring shade number of automatic darkening welding filter - Google Patents
Device and method for measuring shade number of automatic darkening welding filter Download PDFInfo
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- CN102445325A CN102445325A CN2010105058528A CN201010505852A CN102445325A CN 102445325 A CN102445325 A CN 102445325A CN 2010105058528 A CN2010105058528 A CN 2010105058528A CN 201010505852 A CN201010505852 A CN 201010505852A CN 102445325 A CN102445325 A CN 102445325A
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- shade number
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Abstract
The invention discloses a device for measuring the shade number of an automatic darkening welding filter, comprising a laser, a photoelectric detector and a signal processing unit, wherein laser light emitted by the laser is received by the photoelectric detector after passing through the filter and then converted into an electric signal; and the electric signal is processed by the signal processing unit to obtain the shade number of the tested filter, wherein the wavelength of the laser light is 532 nm; and the computational formula of the signal processing unit is N=B+klog10I, wherein N is the shade number, I is a current or a voltage, and B and k are the parameters of the test system. The invention also discloses a method for measuring the shade number of an automatic darkening welding filter.
Description
Technical field
Be used for the equipment of individual protection when the present invention relates to a kind of weld job, relate in particular to a kind of device and method of measuring automatic darkening welding filter lens shade number in this equipment.
Background technology
Automatic darkening welding filter lens is the critical component of welding eye face armour, and it can either offer one of the operating personnel visual field clearly, and accurately tack weld can effectively stop ultraviolet ray and infrared ray in high light and the arc light again.The optical property index of welding optical filtering mainly is to be the serial index on basis with the transmittance, comprises the dependence of angle, shade number of transmittance, transmittance homogeneity, the transmittance of each wave band etc.Wherein shade number is used for representing optical filtering transmittance grade or darkness, and it is the Welder uses the welding optical filtering according to the different work environmental selection unique reference index.Therefore, shade number is not only the key technical indexes of welding optical filtering, also is the foundation that the Welder selects to use the welding optical filtering; The accurate measurements and calculations of shade number have been played crucial effects to improving the quality of products, effectively protect human eye and prevention welding accident.
In the prior art; The method of testing of national standard defined shade number is following: at first adopt the transmittance of spectrophotometer measurement optical filtering between 380-780nm and every separated 1nm to read transmittance one time, introduce the spectrum correction factor of light source and the luminosity function of human eye then and calculate its average transmittance τ
v, utilize shade number defined formula (1) to calculate its shade number N again.Yet there are many shortcomings in this technical scheme, and the method not only needs testing apparatus---the spectrophotometer of large-scale costliness, and its computation process is loaded down with trivial details, time-consuming, very is unfavorable for the on-line monitoring of suitability for industrialized production and product quality.Therefore, shade number how to measure automatic darkening welding filter lens fast just becomes numerous manufacturers and is badly in need of the technical barrier that will solve.
Wherein
In the formula:
V (the λ)--luminosity function of-----human eye;
S
D65(λ)--the spectrum coefficient of-----standard illuminants.
Summary of the invention
The object of the present invention is to provide a kind of can fast detecting the shade number of welding optical filtering, realize the apparatus and method for of the on-line monitoring of optical filtering product quality.
In order to realize the foregoing invention purpose, technical scheme provided by the invention is following:
The invention discloses a kind of device of measuring the automatic darkening welding filter lens shade number; This device comprises laser instrument, and photodetector and signal processing unit, the laser that said laser instrument sends are received and convert into electric signal by photodetector behind optical filtering; Said electric signal obtains the shade number of the optical filtering of surveying after signal processing unit processes; It is characterized in that said Wavelength of Laser is 532nm, said signal processing unit computing formula is N=B+klog
10I, wherein N is a shade number, and I is a curtage, and B and k are the parameter of test macro.
This photodetector is silica-based light power meter.
This signal processing unit comprises modulate circuit, A/D convertor circuit, DSP digital signal processing circuit and power supply; Said modulate circuit is connected with the output terminal of said photodetector; Current signal in order to realize photodetector output amplifies; Said A/D convertor circuit is a digital signal with said analog signal conversion, in the said DSP digital signal processing circuit said computing formula is set.This signal processing unit also comprises digital display circuit, is used to show the numerical value of the shade number of surveying.
The present invention discloses a kind of method of measuring the automatic darkening welding filter lens shade number; Comprise that a branch of wavelength is that the one-wavelength laser of 532nm is through being received and convert into electric signal by photodetector behind the optical filtering; Said electric signal obtains the shade number of the optical filtering of surveying after signal processing unit processes, said signal processing unit computing formula is N=B+klog
10I, wherein N is a shade number, and I is a curtage, and B and k are the parameter of test macro.
This method further is included in the numerical value that shows tested optical filtering shade number on the charactron.
The B parameter of this test macro and k are demarcated by the optical filtering of known shade number.
This signal processing unit comprises modulate circuit, A/D convertor circuit, DSP digital signal processing circuit and power supply; Said modulate circuit is connected with the output terminal of said photodetector; Current signal in order to realize photodetector output amplifies; Said A/D convertor circuit is a digital signal with said analog signal conversion, in the said DSP digital signal processing circuit said computing formula is set.
Compare with prior art, the present invention has following advantage:
The firstth, the selection of light source, because the divergence of laser is little, brightness is high, monochromaticity good, therefore test does not receive the influence of surround lighting, needn't adopt the darkroom, has guaranteed the degree of accuracy and the repeatability of measurement result.The secondth, demarcate optical filtering shade number and its funtcional relationship N=N (τ between 532nm place transmittance
532), and this function directly write in the dsp chip in advance, make the process of test optical filtering shade number fast simple, be suitable for the on-line monitoring of suitability for industrialized production and product quality.The 3rd, the present technique scheme is specially adapted to measure fast on a large scale in the factory shade number of optical filtering.Through test macro of the present invention is assembled on the streamline, can realize extensive measurement fast.
Description of drawings
Can graphicly further be understood through following detailed Description Of The Invention and appended about advantage of the present invention and spirit.
Fig. 1 is the structural representation of measurement automatic darkening welding filter lens shade number device involved in the present invention;
Fig. 2 is the structural representation of signal processing unit in the measurement automatic darkening welding filter lens shade number device involved in the present invention;
Fig. 3 is the process flow diagram based on monochromatic source measurement automatic darkening welding filter lens shade number method involved in the present invention.
Embodiment
Specify specific embodiment of the present invention below in conjunction with accompanying drawing.
The method of testing of defined shade number is following in the national standard: at first adopt the transmittance of spectrophotometer measurement optical filtering between 380-780nm and every separated 1nm to read transmittance one time, introduce the spectrum correction factor of light source and the luminosity function of human eye then and calculate its average transmittance τ
v, utilize shade number defined formula (1) to calculate its shade number N again.
Wherein
In the formula:
V (the λ)--luminosity function of-----human eye;
S
D65(λ)--the spectrum coefficient of-----standard illuminants.
In research process, find optical filtering shade number and its transmittance τ at the 532nm place to above-mentioned prior art scheme
532There is certain functional relation N=N (τ
532).That is to say; Can obtain its shade number through measuring the transmittance of optical filtering at the 532nm place; And need not measure the transmittance at optical filtering each integer wavelength place between 380-780nm; More need not introduce the spectrum correction factor of light source and the luminosity function of human eye, therefore, simplify measuring process and computation process greatly.
Based on above-mentioned discovery, the present technique scheme provides a kind of proving installation and method of testing based on monochromatic source, through this proving installation can the fast detecting optical filtering shade number.
As shown in fig. 1, Fig. 1 is the structural representation of measurement automatic darkening welding filter lens shade number device involved in the present invention.This proving installation comprises, monochromatic source 101, automatic darkening welding filter lens to be tested (hereinafter to be referred as optical filtering) 102, photodetector 103 and signal processing unit 104.In this proving installation, monochromatic source 101, optical filtering 102 is on the same surface level with photodetector 103.In the present invention, but monochromatic source 101 is emission wavelengths is the laser instrument of 532nm laser.Photodetector 103 can be fixed on the base of an adjustable-height or angle, makes the photosurface of photodetector 103 aim at the output port of laser instrument 101 through the height of regulating base.The relative position of fixed light electric explorer 103 and laser instrument 101 after adjusting is accomplished.Then optical filtering 102 is arranged at photodetector 103 and laser instrument 101 centres.Equally, can adopt the mode that optical filtering 102 is fixed on the base of an adjustable-height or angle, make laser pass tested optical filtering.
In the present embodiment, laser instrument has adopted the solid state laser that can launch the 532nm wavelength.The output power of this solid state laser should reach 10 microwatts, and the zlasing mode of its output is a single longitudinal mode.
Photodetector can the selective light electric diode, ccd detector, cmos detector etc. can detect the luminous power that incides on its face, and be converted into the device of corresponding electric current to the variation of this luminous power.Preferably a kind of in the present embodiment silicon based opto-electronics detector, the response time of silicon based opto-electronics detector, dark current was not more than 600nA less than 1 μ s, and the investigative range of this detector is 500pW-5mW.
In order to make shade number ability real time direct monitored, a digital display circuit 205 also is set in the present embodiment, be used for the numerical value of acquired shade number directly is shown in charactron.
The invention also discloses a kind of method that is used to measure the automatic darkening welding filter lens shade number, as shown in Figure 3.Detailed step is following:
301 laser signals are received.The laser that the solid state laser of 532nm sends is received by photodetector through behind the optical filtering.
302 light signals are converted into current signal.In the present embodiment, preferably a kind of silica-based light power meter of photodetector.After photodetector receives laser, convert light signal into current signal.
303 current signals are exaggerated.Photodetector directly is connected with signal processing unit.Modulate circuit in the signal processing unit connects the output terminal of photodetector and the current signal that photodetector is exported is amplified.The analog signal conversion of through the A/D convertor circuit in the signal processing unit prime being amplified again is a digital signal.
304 shade number computing formula.In this shade number computing formula, must accomplish function N=N (τ
532) demarcation.Can know that by aforesaid discovery optical filtering shade number and its funtcional relationship between 532nm place transmittance are N=b+klog
10τ
532, and the short-circuit current of detector and optical filtering transmittance are linear, therefore, above-mentioned functional expression can be rewritten as N=B+klog
10I (I is a curtage), wherein B and k are the parameter of test macro.Usually test parameter B, K utilize the shade number of known optical filtering to demarcate.In signal processing unit, in advance with function N=B+klog
10I writes in the dsp chip.Therefore, obtain the curtage signal, just can directly obtain the shade number of the optical filtering of surveying.
305 show shade number.In the present embodiment,, can realize online detection, in signal processing unit, also comprise a digital display circuit for easy to use.Therefore the numerical value of shade number can directly be presented on the charactron through this number display circuit.
The technique effect that the present invention gives prominence to is mainly reflected in following several respects: the firstth, and the selection of light source; Because the divergence of laser is little, brightness is high, monochromaticity good; Therefore test does not receive the influence of surround lighting, needn't adopt the darkroom, has guaranteed the degree of accuracy and the repeatability of measurement result.The secondth, demarcate optical filtering shade number and its funtcional relationship N=N (τ between 532nm place transmittance
532), and this function directly write in the dsp chip in advance, make the mode of test optical filtering fast simple, be suitable for the on-line monitoring of suitability for industrialized production and product quality.The 3rd, the present technique scheme is specially adapted to measure fast on a large scale in the factory shade number of optical filtering.Through test macro of the present invention is assembled on the streamline, can realize extensive measurement fast.
Described in this instructions is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. device of measuring the automatic darkening welding filter lens shade number; Comprise laser instrument, photodetector and signal processing unit, the laser that said laser instrument sends are received and convert into electric signal by photodetector behind optical filtering; Said electric signal obtains the shade number of the optical filtering of surveying after signal processing unit calculates; It is characterized in that said Wavelength of Laser is 532nm, said signal processing unit computing formula is N=B+klog
10I, wherein N is a shade number, and I is a curtage, and B and k are the parameter of test macro.
2. the device of measurement automatic darkening welding filter lens shade number as claimed in claim 1 is characterized in that, said laser instrument device is the solid state laser of emission single wavelength laser.
3. the device of measurement automatic darkening welding filter lens shade number as claimed in claim 1 is characterized in that, said photodetector is silica-based light power meter.
4. the device of measurement automatic darkening welding filter lens shade number as claimed in claim 1; It is characterized in that; Said signal processing unit comprises modulate circuit, A/D convertor circuit, DSP digital signal processing circuit and power supply, and said modulate circuit is connected with the output terminal of said photodetector, in order to realize the amplification of photodetector output current signal; Said A/D convertor circuit is a digital signal with said analog signal conversion, in the said DSP digital signal processing circuit said computing formula is set.
5. the device of measurement automatic darkening welding filter lens shade number as claimed in claim 3 is characterized in that said signal processing unit also comprises digital display circuit, is used to show the numerical value of measured optical filtering shade number.
6. method of measuring the automatic darkening welding filter lens shade number; Comprise that a branch of wavelength is that the laser of 532nm is through being received and convert into electric signal by photodetector behind the optical filtering; Said electric signal obtains the shade number of tested optical filtering after signal processing unit processes, said signal processing unit computing formula is N=B+klog
10I, wherein N is a shade number, and I is a curtage, and B and k are the parameter of test macro.
7. the method for a measurement automatic darkening welding filter lens shade number as claimed in claim 5 is characterized in that, said laser is that wavelength is the one-wavelength laser of 532nm.
8. the method for measurement automatic darkening welding filter lens shade number as claimed in claim 5 is characterized in that, the B parameter of said test macro and k are demarcated by the optical filtering of known shade number.
9. the method for measurement automatic darkening welding filter lens shade number as claimed in claim 5; It is characterized in that; Said signal processing unit comprises modulate circuit, A/D convertor circuit, DSP digital signal processing circuit and power supply, and said modulate circuit is connected with the output terminal of said photodetector, amplifies in order to the current signal of realizing photodetector output; Said A/D convertor circuit is a digital signal with said analog signal conversion, in the said DSP digital signal processing circuit said computing formula is set.
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| CN2010105058528A CN102445325A (en) | 2010-10-13 | 2010-10-13 | Device and method for measuring shade number of automatic darkening welding filter |
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| CN2010105058528A CN102445325A (en) | 2010-10-13 | 2010-10-13 | Device and method for measuring shade number of automatic darkening welding filter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674492A (en) * | 2013-11-29 | 2014-03-26 | 天津大学 | Method of measuring diffused light reduced luminance coefficient for auto-darkening welding filter |
| CN104655397A (en) * | 2013-11-19 | 2015-05-27 | 中国标准化研究院 | Device for detecting shading number and response time of auto-darkening welding filter |
| CN105352708A (en) * | 2015-09-22 | 2016-02-24 | 天津大学 | Measurement device of diffused light reduced luminance coefficient of auto-darkening welding filter |
| CN106017870A (en) * | 2016-06-19 | 2016-10-12 | 宁波卡瑞迈特电子科技有限公司 | Electric welding face mask detection device and electric welding face mask detection method |
| CN109990978A (en) * | 2019-04-10 | 2019-07-09 | 深圳市金视达光电有限公司 | A kind of detection device of camera lens IR wavelength |
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| CN2151732Y (en) * | 1993-01-12 | 1994-01-05 | 陈柏兴 | Blackness adjustable electronic auto welding colour filter glass |
| US5570254A (en) * | 1991-10-18 | 1996-10-29 | Robert Bosch Gmbh | Method and device for preventing excessive currents in a welding converter |
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| US5570254A (en) * | 1991-10-18 | 1996-10-29 | Robert Bosch Gmbh | Method and device for preventing excessive currents in a welding converter |
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| US20090300810A1 (en) * | 2005-10-11 | 2009-12-10 | 3M Innovative Properties Company | Control of an automatic darkening filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655397A (en) * | 2013-11-19 | 2015-05-27 | 中国标准化研究院 | Device for detecting shading number and response time of auto-darkening welding filter |
| CN104655397B (en) * | 2013-11-19 | 2018-01-02 | 中国标准化研究院 | A kind of automatic darkening welding filter lens shade number and response time detection means |
| CN103674492A (en) * | 2013-11-29 | 2014-03-26 | 天津大学 | Method of measuring diffused light reduced luminance coefficient for auto-darkening welding filter |
| CN103674492B (en) * | 2013-11-29 | 2016-08-17 | 天津大学 | Automatic darkening welding filter lens diffused light reduction luminance factor measuring method |
| CN105352708A (en) * | 2015-09-22 | 2016-02-24 | 天津大学 | Measurement device of diffused light reduced luminance coefficient of auto-darkening welding filter |
| CN106017870A (en) * | 2016-06-19 | 2016-10-12 | 宁波卡瑞迈特电子科技有限公司 | Electric welding face mask detection device and electric welding face mask detection method |
| CN109990978A (en) * | 2019-04-10 | 2019-07-09 | 深圳市金视达光电有限公司 | A kind of detection device of camera lens IR wavelength |
| CN109990978B (en) * | 2019-04-10 | 2022-03-25 | 深圳市金视达光电有限公司 | Detection equipment for IR wavelength of lens |
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Application publication date: 20120509 |