CN104655397A - Device for detecting shading number and response time of auto-darkening welding filter - Google Patents
Device for detecting shading number and response time of auto-darkening welding filter Download PDFInfo
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- CN104655397A CN104655397A CN201310581547.0A CN201310581547A CN104655397A CN 104655397 A CN104655397 A CN 104655397A CN 201310581547 A CN201310581547 A CN 201310581547A CN 104655397 A CN104655397 A CN 104655397A
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Abstract
The invention provides a device for detecting the shading number and the response time of an auto-darkening welding filter, and belongs to the technical field of auto-darkening welding filters. The device comprises a collimated light source (2), a darkroom (10), and a detection and control circuit (6). A right-angle reflection mirror (3), a four-dimensional motion sample stage (9), a photoelectric sensor (5) and a trigger light source (8) are arranged in the darkroom (10). A detected filter sample (4) is installed on the four-dimensional motion sample stage (9). The trigger light source (8) presses a photoelectric detector on the detected filter sample (4). The detection and control circuit (6) is connected with the trigger light source (8), the photoelectric sensor (5) and the four-dimensional motion sample stage (9 in the darkroom (10) through cables.
Description
Technical field
The invention belongs to dynamic darkening welding filter capable detection field, be specifically related to a kind of automatic darkening welding filter lens shade number and response time pick-up unit.
Background technology
When weld job, a large amount of ultraviolet, infrared ray, high light injury eyes can be produced.Therefore people develop darkening welding filter capable to protect welder.Darkening welding filter capable is made up of photodetector, light valve, control circuit, power supply, framework, inside and outside screening glass etc.; by the initiation of arc light with extinguish the shade number conversion automatically controlling optical filtering; realize dark and bright states conversion, thus the protection effectively improved laborer and work efficiency.Response time and shade number are the most important indexs of automatic darkening welding filter lens, are the keys determining whether this product quality closes, have also made clear and definite regulation to these indexs in national standard.But China still lacks the equipment effectively can measuring the automatic darkening welding filter lens response time at present, this is mainly because existing testing apparatus cannot reach the demand of most welding optical filtering in the market in response time measuring accuracy.Proving installation response time, measuring accuracy response time as Zhejiang University's development is domestic the highest at present, but this testing apparatus also only can measure the optical filtering of response time 0.5ms, the response time of a lot of optical filtering is all lower than this value at present, causes this testing apparatus range of application still narrower.In addition, existing test device system forms all very complicated, and need to connect host computer, cost is higher, uses inconvenience, is difficult to carry out commercialization popularization.Therefore, China still lacks effective automatic darkening welding filter lens quality detection apparatus, develops a kind of novel checkout equipment, all can play beneficial effect to the universal of this product and quality supervision.
Summary of the invention
The object of the invention is to the deficiency overcoming existing testing apparatus, a kind of automatic darkening welding filter lens shade number and response time pick-up unit are provided, can Measurement accuracy automatic darkening welding filter lens response time and shade number, measure response time and the transmittance of automatic darkening welding filter lens exactly, transmittance homogeneity can also be measured, dependence of angle simultaneously.
The present invention is achieved by the following technical solutions:
A kind of automatic darkening welding filter lens shade number and response time pick-up unit, comprise collimated light source 2, darkroom 10 and detection and control circuit 6;
In described darkroom 10, be provided with corner cube mirror 3, four-dimensional movement sample stage 9, photoelectric sensor 5 and trigger light source 8;
Tested optical filtering sample 4 is arranged on described four-dimensional movement sample stage 9, and described triggering light source 8 is pressed on the photodetector on tested optical filtering sample 4;
Described detection and control circuit 6 is connected with the triggering light source 8 in darkroom 10, photoelectric sensor 5 and four-dimensional movement sample stage 9 respectively by cable.
Light hole is provided with in the side in described darkroom 10, the collimated light beam that described collimated light source 2 sends incides in darkroom 10 by described light hole, be on same optical axis with tested optical filtering sample 4, photoelectric sensor 5 after corner cube mirror 3 reflects, after tested optical filtering sample 4, received by photoelectric sensor 5, and detection signal is passed to detection and control circuit 6.
The diameter of described light hole is 5-10mm.
Described four-dimensional movement sample stage 9 comprises electronic X-axis rectilinear translation platform, electronic Y-axis rectilinear translation platform, electronic X-axis oscillating table and electronic Y-axis oscillating table;
Described electronic X-axis rectilinear translation platform realizes the movement of the X-direction of sample; Described electronic Y-axis rectilinear translation platform realizes the movement of the Y direction of sample; Described electronic X-axis oscillating table realizes in the vertical plane of X-axis around the swing of positive and negative 15 degree of X-direction; Described electronic Y-axis oscillating table realizes in the vertical plane of Y-axis around the swing of positive and negative 15 degree of Y direction;
Described electronic Y-axis oscillating table is provided with base 44, described base 44 is provided with clamper, described clamper is flexible member, for clamping optical filtering sample;
Described clamper comprises two elastic pressuring plates, and one end of elastic pressuring plate is fixed on base 44, and two elastic pressuring plates coordinate the tested optical filtering sample that can clamp different size thickness;
Described base 44 is provided with screw rod, screw rod is provided with the first slide bar 41 from top to bottom successively and the second slide bar 43, two slide bars can rotate centered by screw rod; Described first slide bar 41 is provided with slide block, and described slide block can be free to slide along the first slide bar 41;
Triggering light source cylinder by being threaded in described slide block, being screwed into depth adjustable; Trigger the inside that light source 8 is arranged on described triggering light source cylinder;
Described second slide bar 43 is provided with LED board, LED board is processed with the through hole matched with the second slide bar 43, LED board can be free to slide along the second slide bar 43, is fixed after mixing up position by trip bolt; Described LED board is provided with white light LEDs; LED board does not directly contact with sample, but its light sent can be irradiated on sample.
Described photoelectric sensor 5 adopts photoelectric diode, and described triggering light source 8 adopts high speed infrared LED.
Described pick-up unit comprises display 7 further, for display measurement result; Described display 7 adopts dot matrix LED.
Described collimated light source 2 comprises the measurement light source be placed in closed container, ellipsoid metallic mirror, diaphragm and plano-convex lens; Described measurement light source, diaphragm lay respectively at the left and right focus place of ellipsoid metallic mirror; Plano-convex lens focus overlaps with the right focus of ellipsoid metallic mirror; Be 5mm (directional light spot diameter is necessary for 5mm, determines according to Standard, and the diameter of light hole can be more bigger than this size, so that debugging) by the directional light spot diameter of plano-convex lens outgoing.
Described measurement light source adopts 24V50W Halogen lamp LED.
Described device comprises high stable constant current source 1 further, and collimated light source 2 is powered by high stable constant current source 1;
Described high stable constant current source 1 comprises transformer, rectifier filer, expansion current circuit, linear voltage regulator, accurate reference voltage, track to track operational amplifier, current amplifier and current sample feedback resistance in parallel; It is in parallel with linear voltage regulator that current circuit is expanded in described parallel connection;
Described current sample feedback resistance and current amplifier connect with measurement light source, can provide steady current for it; Ac signal, after transformer, rectifier filer, becomes d. c. voltage signal by linear voltage regulator, and d. c. voltage signal is by being input to track to track operational amplifier as with reference to reference signal after accurate reference voltage; The output signal of track to track operational amplifier is input to measurement light source after current amplifier, is fed back to the input end of track to track operational amplifier by current sample feedback resistance simultaneously.
Described detection and control circuit 6 comprises I/V transducer, traffic filter, high-precision a/d converter, microcontroller, two-way pulse producer, output amplifier, gear control circuit, motor-drive circuit and external key;
The sensor signal that described photoelectric sensor 5 generates is transformed into voltage signal by I/V transducer; Described microcontroller is by the enlargement factor of gear control circuit control I/V transducer; Output amplifier can export the pulse drive signal driving and trigger light source 8;
Motor-drive circuit can export the four-dimensional movement platform control signal driving four-dimensional movement sample stage 9 to move; Described four-dimensional movement sample stage 9 is by driving stepper motor, and total movement all completes under the control of the micro-controller automatically; Motor-drive circuit adopts stepper motor driver, is connected with microcontroller by triode;
Microcontroller is by exporting LCD control signal driving display 7; Display 7 is serial communication signal with the connection signal of microcontroller;
Described high-precision a/d converter is 16,500khzA/D converter; The data that A/D converter exports pass to microcontroller, carry out data processing, storage and computing; Two-way pulse producer triggers the drive singal of light source 8 for generation of driving; Two-way pulse producer export signal through output amplifier to improve load capacity.
Described gear control circuit comprises at least 2 relays and drives triode; The collector of the coil-end access triode of described relay; The ground level of triode connects single-chip I/O mouth by current-limiting resistance; The resistance that the tip side of different relay connects different resistance has different amplification to make I/V transducer; Microcontroller selects different relay conductings by I/O mouth, realizes the selection of different gear.
Compared with prior art, the invention has the beneficial effects as follows:
1., owing to have employed triggering light source and the metering circuit of low retardation time of high-speed starting, the present invention can reach 0.1ms to the measuring accuracy of response time, meets national standard requirement, is applicable to the most of automatic darkening welding filter lens on market;
2. the present invention is directed to the feature that automatic darkening welding filter lens transmittance variation range is large, devise different gear change-over circuit, can effectively solve great dynamic range high-acruracy survey.
3. the present invention first in national standard to the requirement of automatic beam change optical filtering transmittance all fortune property and dependence of angle, devise four-dimensional movement sample stage and elastic clamping mechanism, transmittance homogeneity and dependence of angle measurement can be carried out to the optical filtering sample of different model.
4. the present invention have employed embedded microprocessor innovatively as core parts, makes proving installation compact conformation, can completely independently carry out surveying work and without the need to connecting host computer, not only easy to use, has more very high economy.
5. for the requirement of national standard to measurement light source, the present invention devises the collimating structure for standard A lamp especially, can provide the collimated light meeting Standard for measuring.
6. the present invention devises the special high stable constant current source of standard sources especially, ensures as standard sources provides the steady current of high stability; It is little that this light source has volume, the feature that cost is low.
7. the present invention adopts high speed infrared LED as triggering light source, is applicable to most automatic darkening welding filter lens on the market; The pulse high speed triggering circuit of design can ensure that triggering light source reaches nanosecond start-up time, and can stablize triggering optical filtering sample; The triggering light source physical construction of design has adjustable characteristic, can carry out adjusting to reduce light leak as far as possible for the photoelectric probe position of different optical filtering.
Accompanying drawing explanation
Fig. 1 is automatic darkening welding filter lens shade number and response time structure of the detecting device schematic diagram;
Fig. 2 is detection and control circuit structure schematic diagram;
Fig. 3 is the structure principle chart of high stable constant current source;
Fig. 4 is collimated light source structural representation;
Fig. 5 is four-dimensional movement sample stage schematic diagram;
Fig. 6 is automatic darkening welding filter lens response time schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
According to standard GB/T-T/3609.2, automatic darkening welding filter lens represents by with following formula from bright state to the switching time of dark-state:
In formula:
T
sfor switching time, unit is millisecond (ms);
τ is bright state transmittance;
τ
2for the transmittance of measured dark-state light;
T=0 is for starting the striking time, and unit is millisecond (ms);
τ (t) for after striking in the transmittance of the visible ray of time t, i.e. " visible transmission ratio-time " change curve of light valve.
T=t (τ (t)=3 τ
2) for transmittance drop to dark-state transmittance 3 times time, corresponding time point, unit is millisecond (ms).
According to the definition of national standard, measuring the response time needs to record the transmittance change curve of whole automatic darkening welding filter lens and calculates integration, as shown in Figure 6.
The present invention can measure response time and the shade number of optical filtering sample exactly, and precision is up to state standards requirement; Have employed portable sample stage, the measurement demand than homogeneity and dependence of angle of sample transmission in national standard can be completed; Specially designed collimated light source can provide the directional light that collimation is very high; The sample stage of design adopts elastic clamping mechanism, can be applicable to the size of most automatic light-filting mirror on the market; Triggering light source adopts adjustable structure can ensure and the photoelectric sensor close contact on the optical filtering sample of different model, prevents light leak; The detection and control circuit of design can complete independently surveying work, assists without the need to host computer.
As shown in Figure 1, a kind of automatic darkening welding filter lens shade number of the present invention and response time pick-up unit comprise high stable constant current source 1, collimated light source 2, trigger light source 8, corner cube mirror, optical filtering sample, photoelectric sensor, detection and control circuit, display, four-dimensional movement sample stage and darkroom; Wherein, four-dimensional movement sample stage is made up of two-dimension translational platform and two-dimensional wiggle platform; Triggering light source, sample stage, photoelectric sensor are placed in darkroom; Collimated light source 2 is powered by high stable constant current source 1, the collimated light beam sent incides in darkroom 10 by the light hole that diameter is 5mm, be on same optical axis with sample, photoelectric sensor after corner cube mirror 3 reflects, through tested optical filtering sample 4, received by photoelectric sensor 5, and detection signal is passed to detection and control circuit 6.Triggering light source 8 is pressed on the photodetector on sample; Detection and control circuit 6 is connected with the triggering light source 8 in display and darkroom 10, photoelectric sensor device and four-dimensional movement sample stage 9 by cable, and start for controlling to trigger light source, sample stage moves and gathers measuring-signal.
Trigger light source and can issue in the control of detection and control circuit the triggering light that sample of sening as an envoy to enters trigger state, and should be pressed on the photodetector of sample, to eliminate the impact of light leak on photoelectric sensor 5.As a kind of concrete embodiment, photoelectric sensor 5 can elect photoelectric diode as, and triggers light source 8 and can adopt high speed infrared LED.Four-dimensional movement sample stage 9 can complete two dimension angular and swing and two-dimension translational motion under the effect of detection and control circuit 6, and never co-located and different angles incide on sample to enable incident light.
Detection and control circuit structure as shown in Figure 2, be made up of I/V transducer, traffic filter, high-precision a/d converter, microcontroller, two-way pulse producer, output amplifier, gear control circuit, motor-drive circuit, external key, photoelectric sensor 5 input signal access I/V transducer; Output amplifier can export the pulse drive signal driving and trigger light source; Motor-drive circuit can export the four-dimensional movement platform control signal driving sample stage motion; Microcontroller is by exporting LCD control signal driving display.Specifically, first the sensor signal 11 that photoelectric sensor 5 generates is transformed into voltage signal by I/V transducer 12; Microcontroller 15 is by the enlargement factor of gear control circuit 19 control I/V transducer 12; It is too low that the cutoff frequency of signal filter circuit 13 can not select, otherwise retardation time can be caused long; High-precision a/d converter 14 is 16,500khzA/D converter; The data that A/D converter exports pass to microcontroller 15, carry out data processing, storage and computing; Two-way pulse producer 16 triggers the drive singal of light source 8 for generation of driving, wherein a road high-frequency impulse is for driving infrared LED, and low-frequency pulse modulation signal is then for simulating the blinking characteristic of welding arc light.Pulse producer 16 export signal demand through current amplifier 17 to improve load capacity, as a kind of implementation, can choice for use speed-sensitive switch triode.Motor-drive circuit 20 is stepper motor driver, needs to be connected with microcontroller 15 by triode, for exporting the pulse control signal 21 controlling four-dimensional movement sample stage 9.Display 7 can select dot matrix LED, and the connection signal (i.e. LCD display control signal) 22 of itself and microcontroller 15 is serial communication signal.
Different gears and different enlargement factors are selected, and gear control circuit is by several relay and drive triode to realize.Relay coil termination enters transistor collector; Triode ground level connects single-chip I/O mouth by current-limiting resistance; The resistance that the tip side of different relay connects different resistance has different amplification to make I/V transducer.Microcontroller selects different relay conductings by I/O mouth, just can realize different gear and select.
Fig. 3 shows the structure of measurement light source 31 high stable constant current source used 1, comprise transformer, rectifier filer, expansion current circuit, linear voltage regulator, accurate reference voltage, track to track operational amplifier, current amplifier, current sample feedback resistance in parallel, current sample feedback resistance and current amplifier connect with measurement light source, can provide steady current for it.Specifically, 220V ac signal, through transformer 24, after rectifier filer 25, becomes the d. c. voltage signal of about 28V by linear voltage regulator 27.Because linear voltage regulator output current is very little, need expansion current circuit 26 in parallel, available Darlington triode realizes.The direct current signal exported, by improving stability further after accurate reference voltage 28, is input to track to track operational amplifier 29 as with reference to reference signal.The output signal of operational amplifier is fed back to the input end of track to track operational amplifier 29 after Current amplifier 30 by current sampling resistor 32.Utilize the characteristic of ideal operational amplificr, feedback signal and reference signal almost equal, make the electric current exporting measurement light source 31 to also be tending towards constant.Current sampling resistor 32 selects copper-manganese sampling resistor, can reduce the impact of temperature on resistance.
Measurement light source 31 used is 24V50W Halogen lamp LED, and the light of transmitting is scattered light.Fig. 4 shows structure scattered light being converted into collimated light, and described collimated light source comprises measurement light source, ellipsoid metallic mirror, diaphragm and plano-convex lens; Measurement light source, diaphragm lay respectively in the left and right focus of ellipsoid metallic mirror; Plano-convex lens focus overlaps with ellipsoid metallic mirror right focus; Be 5mm by the directional light spot diameter of plano-convex lens outgoing.Measurement light source 31 is placed in the left focus place of ellipsoid metallic mirror 33.Utilize the characteristic of ellipsoid metallic mirror, the scattered light that light source sends can converge at the right focus of ellipsoid metallic mirror.The focus of plano-convex lens 35 is overlapped with the right focus of metallic mirror 33, just can obtain directional light.For reducing the impact of parasitic light, placed diaphragm 34 at right focus, whole device will be placed in closed container simultaneously, eliminates light leak.
In order to complete the measurement of sample transmission than homogeneity and dependence of angle, need special design four-dimensional movement sample stage, as shown in Figure 5.Electronic X-axis rectilinear translation platform 36 and electronic Y-axis rectilinear translation platform 37 constitute two-dimension translational platform, can realize X-axis 150mm, the tangential movement of Y-axis 50mm, the length of counter sample form and width, can complete the measurement of sample homogeneity.Electronic X-axis oscillating table 38 and electronic Y-axis oscillating table 39 constitute two-dimensional wiggle platform, and sample can be made along X-axis Y-axis two direction to do swing (in the surface level axis oscillating of positive and negative 15 degree.Positive and negative 15 degree refer to relative level face, the swing namely in vertical guide, for completing the measurement of dependence of angle).Four-dimensional movement platform is by driving stepper motor, and total movement all automatically completes under the control of microcontroller 15, without the need to manual operation.For meeting the measurement demand of the optical filtering sample of different model on the market, have also been devised adjustable elastic clamper, as shown in Figure 5.Base 44 is provided with clamper, for flexible member, for clamping optical filtering sample, specifically, clamper comprises two elastic pressuring plates 47, and (when specifically implementing, elastic pressuring plate material is spring steel, after bending to suitable shape, open hole thereon, be fixed by screws in base 44 two ends.), the optical filtering sample of different size thickness can be clamped.Screw rod 40 is provided with the first slide bar 41 and the second slide bar 43, two slide bar can along bolt rotary.Wherein the first slide bar 41 there is slide block 45, can be free to slide along the first slide bar 41.Trigger light source cylinder 46 (trigger light source cylinder inside and triggering light source 8 is housed) and, by being threaded in slide block 45, be screwed into depth adjustable.By this mechanical hook-up, trigger light source cylinder 46 and can guarantee and the photoelectric detector all close contacts on different model optical filtering sample, prevent light leak.Slide bar 43 is provided with LED board 42, position is also adjustable.LED board installs white light LEDs, and for charging to optical filtering sample, LED board 42 does not directly contact with sample, but its light sent can be irradiated on sample.
The course of work of apparatus of the present invention is as follows: start measurement light source, does not first put into sample, selects n.s. gear, records the incident intensity of measurement light source; Put into sample, select gear, record bright state light intensity, obtain bright state transmittance and calculate shade number; Start and trigger light source, again select gear, record dark-state light intensity, obtain dark-state transmittance and calculate dark-state shade number; Close and trigger light source, put the gear in the test response time, while startup triggers light source, record data, record light intensity curve, more just can calculate the response time according to bright state and dark-state transmittance values.
During the dependence that takes measurement of an angle, microcontroller 15 sends instruction, oscillating table is often swung and was once measuring once; Obtain the minimum value and the maximal value that become the transmittance in 15 degree of spatial angle range at sample minute surface normal with incident light, sample angle dependence can be obtained.
When measuring sample transmission than homogeneity, two-dimension translational platform does translation motion under the control of microcontroller 15, measures the transmittance of sample diverse location, calculates homogeneity with this.
Above-mentioned measurement result both can pass to LCD display 7 by microcontroller 15 and show, and is also connected to host computer by cable, carries out more detailed result display.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.
Claims (10)
1. automatic darkening welding filter lens shade number and a response time pick-up unit, is characterized in that: described pick-up unit comprises collimated light source (2), darkroom (10) and detection and control circuit (6);
In described darkroom (10), be provided with corner cube mirror (3), four-dimensional movement sample stage (9), photoelectric sensor (5) and trigger light source (8);
Tested optical filtering sample (4) is arranged on described four-dimensional movement sample stage (9), and described triggering light source (8) is pressed on the photodetector on tested optical filtering sample (4);
Described detection and control circuit (6) is connected with the triggering light source (8) in darkroom (10), photoelectric sensor (5) and four-dimensional movement sample stage (9) respectively by cable.
2. automatic darkening welding filter lens shade number according to claim 1 and response time pick-up unit, it is characterized in that: be provided with light hole in the side of described darkroom (10), the collimated light beam that described collimated light source (2) sends incides in darkroom (10) by described light hole, with tested optical filtering sample (4) after corner cube mirror (3) reflection, photoelectric sensor (5) is on same optical axis, after tested optical filtering sample (4), received by photoelectric sensor (5), and detection signal is passed to detection and control circuit (6).
3. automatic darkening welding filter lens shade number according to claim 2 and response time pick-up unit, is characterized in that: the diameter of described light hole is 5-10mm.
4. automatic darkening welding filter lens shade number according to claim 3 and response time pick-up unit, is characterized in that: described four-dimensional movement sample stage (9) comprises electronic X-axis rectilinear translation platform, electronic Y-axis rectilinear translation platform, electronic X-axis oscillating table and electronic Y-axis oscillating table;
Described electronic X-axis rectilinear translation platform realizes the movement of the X-direction of sample; Described electronic Y-axis rectilinear translation platform realizes the movement of the Y direction of sample; Described electronic X-axis oscillating table realizes in the vertical plane of X-axis around the swing of positive and negative 15 degree of X-direction; Described electronic Y-axis oscillating table realizes in the vertical plane of Y-axis around the swing of positive and negative 15 degree of Y direction;
Described electronic Y-axis oscillating table is provided with base (44), described base (44) is provided with clamper, described clamper is flexible member, for clamping optical filtering sample;
Described clamper comprises two elastic pressuring plates, and one end of elastic pressuring plate is fixed on base (44), and two elastic pressuring plates coordinate the tested optical filtering sample that can clamp different size thickness;
Described base (44) is provided with screw rod, and screw rod is provided with the first slide bar (41) and the second slide bar (43) from top to bottom successively, and two slide bars can rotate centered by screw rod; Described first slide bar (41) is provided with slide block, and described slide block can be free to slide along the first slide bar (41);
Triggering light source cylinder by being threaded in described slide block, being screwed into depth adjustable; Trigger the inside that light source (8) is arranged on described triggering light source cylinder;
Described second slide bar (43) is provided with LED board, LED board is processed with the through hole matched with the second slide bar (43), LED board can be free to slide along the second slide bar (43), is fixed after mixing up position by trip bolt; Described LED board is provided with white light LEDs.
5. automatic darkening welding filter lens shade number according to claim 4 and response time pick-up unit, is characterized in that: described photoelectric sensor (5) adopts photoelectric diode, and described triggering light source (8) adopts high speed infrared LED.
6. automatic darkening welding filter lens shade number according to claim 5 and response time pick-up unit, is characterized in that: described pick-up unit comprises display (7) further, for display measurement result; Described display (7) adopts dot matrix LED.
7. automatic darkening welding filter lens shade number according to claim 6 and response time pick-up unit, is characterized in that: described collimated light source (2) comprises the measurement light source be placed in closed container, ellipsoid metallic mirror, diaphragm and plano-convex lens; Described measurement light source, diaphragm lay respectively at the left and right focus place of ellipsoid metallic mirror; Plano-convex lens focus overlaps with the right focus of ellipsoid metallic mirror; Be 5mm by the directional light spot diameter of plano-convex lens outgoing; Described measurement light source adopts 24V50W Halogen lamp LED.
8. automatic darkening welding filter lens shade number according to claim 7 and response time pick-up unit, it is characterized in that: described pick-up unit comprises high stable constant current source (1) further, collimated light source (2) is powered by high stable constant current source (1);
Described high stable constant current source (1) comprises transformer, rectifier filer, expansion current circuit, linear voltage regulator, accurate reference voltage, track to track operational amplifier, current amplifier and current sample feedback resistance in parallel; It is in parallel with linear voltage regulator that current circuit is expanded in described parallel connection;
Described current sample feedback resistance and current amplifier connect with measurement light source, can provide steady current for it; Ac signal, after transformer, rectifier filer, becomes d. c. voltage signal by linear voltage regulator, and d. c. voltage signal is by being input to track to track operational amplifier as with reference to reference signal after accurate reference voltage; The output signal of track to track operational amplifier is input to measurement light source after current amplifier, is fed back to the input end of track to track operational amplifier by current sample feedback resistance simultaneously.
9. automatic darkening welding filter lens shade number according to claim 8 and response time pick-up unit, is characterized in that: described detection and control circuit (6) comprises I/V transducer, traffic filter, high-precision a/d converter, microcontroller, two-way pulse producer, output amplifier, gear control circuit, motor-drive circuit and external key;
The sensor signal that described photoelectric sensor (5) generates is transformed into voltage signal by I/V transducer; Described microcontroller is by the enlargement factor of gear control circuit control I/V transducer; Output amplifier can export the pulse drive signal driving and trigger light source (8);
Motor-drive circuit can export the four-dimensional movement platform control signal driving four-dimensional movement sample stage (9) to move; Described four-dimensional movement sample stage (9) is by driving stepper motor, and motor-drive circuit adopts stepper motor driver, is connected with microcontroller by triode;
Microcontroller is by exporting LCD control signal driving display (7); Display (7) is serial communication signal with the connection signal of microcontroller;
Described high-precision a/d converter is 16,500khzA/D converter; The data that A/D converter exports pass to microcontroller, carry out data processing, storage and computing; Two-way pulse producer triggers the drive singal of light source (8) for generation of driving; Two-way pulse producer export signal through output amplifier to improve load capacity.
10. automatic darkening welding filter lens shade number according to claim 9 and response time pick-up unit, is characterized in that: described gear control circuit comprises at least 2 relays and drives triode; The collector of the coil-end access triode of described relay; The ground level of triode connects single-chip I/O mouth by current-limiting resistance; The resistance that the tip side of different relay connects different resistance has different amplification to make I/V transducer; Microcontroller selects different relay conductings by I/O mouth, realizes the selection of different gear.
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| CN109186962A (en) * | 2018-11-05 | 2019-01-11 | 天津大学 | A kind of automatic beam change welding goggles clamping device |
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| CN112461797A (en) * | 2020-11-05 | 2021-03-09 | 江苏美信光电科技有限公司 | Method for quickly measuring response time of automatic darkening welding filter |
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