CN106679802A - Method and device used for testing and analyzing LED visual brightness under pulses or DC drive - Google Patents
Method and device used for testing and analyzing LED visual brightness under pulses or DC drive Download PDFInfo
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Abstract
The invention discloses a method and device used for testing and analyzing LED visual brightness under pulses or DC drive. By utilizing vision sluggishness of human eyes, a subjective sensation brightness theory and a characteristic of high light emitting response speed of an LED light source, through combining with data obtained through modification and testing with flashlight effective light intensity testing research and calculation methods such as a Blondel-Rey method, a Form Factor method and an Allard method, a vision attenuation constant alpha is obtained through calculation and further a vision attenuation function of the LED under pulse drive and a visual brightness curve of pulsed light can be simulated. According to the invention, the visual brightness curve can be drawn. Integration is performed on said curve and an obtained integral area is the human eye subjective sensation brightness. Through comparing the human eye subjective sensation brightness with a brightness sensation level in a DC condition, visual brightness conditions in a DC condition and a pulse condition in different duty ratios can be analyzed.
Description
Technical field
It is the present invention relates to LED visual brightness detection fields more particularly to a kind of for detecting pulsed drive
The method and device of LED visual brightnesses under mode.
Background technology
The chip that the core of LED is made up of p-type semiconductor and n-type semiconductor, partly leads in p-type
There are a transition zone, referred to as p-n junction between body and n-type semiconductor.In the PN of some semi-conducting materials
In knot, minority carrier and the majority carrier compound tense of injection can in the form of light release unnecessary energy
Release, so as to electric energy is converted directly into luminous energy.Electric current is adjusted, the intensity of light just can be adjusted, is led to
The band structure and band gap of toning whole timber material, thus it is possible to vary glow color.
At present some scholars are devoted to replacing traditional power supply to drive LED/light source by the pulse power, because
For pulse driving power not only can well improve the luminous effect of LED/light source relative to conventional power source
Rate, and can also effectively improve heat dissipation problem --- (with the pulsed current excitation LED chip being interrupted,
Effectively the heat for producing can be scattered and disappeared away.), the researcher of Bath universities is proposed using pulse electricity
Stream source replaces DC source to drive LED, and finds that pulsed drive than DC driven there is higher quantum to imitate
Rate, and the saturation point of current density also substantially increases, and M.Baeumler et al. have studied ultraviolet one
Situations of purple (AIGaln) the N LED under pulse and DC driven, and above-mentioned saturated phenomenon is summed up
Non-thermal effect two parts caused for fuel factor and due to electric current, it is often more important that under pulsed drive, can
To improve " visual brightness " of LED/light source.Ehime, Japan university (え ひ め だ い Ga く, Ehime
University) studying physiological engineering research is wild refined text of information electronics information engineering specialty associate professor god etc.,
Using the photobehavior of human eye.It is that 5% or so, frequency is 60Hz's or so to apply dutycycle to LED
During pulse voltage, with apply DC voltage when compared with, the brightness that human eye is experienced is about 2 times.Subject
The evaluation and test experiment display of participation, adopts the brightness that blue led can be experienced for 1.5～1.9 times, green
LED is 2.0～2.2 times, and red LED is 1.0～1.3 times.
Visual effect of the light-pulse generator in the case where same energy is consumed has very big difference than stable light source, more holds
Easily attract much attention.Due to the characteristic of its eye response it is significantly different with stable light source, so being all
Its characteristic is described with efficient intensity.Through long-term research work, there has been proposed several measurement flashes of light
The method of light fixture Equipnal light intensity, i.e. Blondel-Rey methods, Form Factor methods and Allard methods.
These three methods are not in actual applications very systems and comprehensively, and people have also been proposed some amendments.
The content of the invention
The technical problem to be solved is to provide a kind of test analysis that are used in pulse or DC driven
The method of lower LED visual brightnesses, using the visual persistence of human eye, subjective sensation brightness theory and LED light
The fireballing feature of source luminescence response, with reference to the testing research and computational methods of the efficient intensity of flash lamp,
The data that Blondel-Rey methods, the amendment of Form Factor methods and Allard methods and experiment are measured, meter
Calculation obtains its visual attenuation constant a, by visual attenuation constant a, can simulate LED under pulsed drive
Visual attenuation function and pulsed light photopic luminosity curve (brightness sensation curve), and regard using human eye
Feel that inert characteristic is corrected to Talbot laws, further combined with the photoelectric characteristic of LED, to LED
The lifting multiple of the human eye brightness perception level under pulsed drive and DC driven is compared, i.e. pulse
The lifting multiple with the brightness perception level under DC driven is driven, while also providing a kind of for testing
The device of analysis LED visual brightnesses under pulse or DC driven.
To solve above-mentioned technical problem, the invention provides a kind of test analysis that are used for are in pulse or DC driven
The method of lower LED visual brightnesses, comprises the following steps：
Step one, connection DC circuit, dc source is of coupled connections with DC driven LED/light source two ends,
Described DC driven LED/light source is arranged at the first integral ball centre of sphere, by a SSP6612LED
Photochromic electrical quantity comprehensive tester is arranged on the output end of described first integral ball；
Step 2, connection impulse circuit, by pulsed drive LED/light source and small resistor series electrical in series
Road, digital signal generator is of coupled connections with series circuit two ends, by described pulsed drive LED light
Source is arranged at the second integral ball centre of sphere, by the photochromic electrical quantity comprehensive tester peaces of the 2nd SSP6612LED
The output end of described second integral ball is mounted in, the first oscilloscope coupling is connected to into the data signal and is sent out
Raw device two ends, by the second oscilloscope coupling the small resistor two ends, the digital signal generator are connected to
Rectangular pulse signal is output as, its pulse frequency is not less than 50Hz, and by first oscillograph and the
The voltage of two oscilloscope displays calculates the power output of the digital signal generator；
Step 3, employing " Demographics' method ", randomly choose 20 observers, and every observer adopts
Identical observational technique is used, i.e.,：Data signal is kept to occur during the observation of certain fixed duty cycle
Device drives parameter constant, the magnitude of voltage of constantly regulate dc source, until viewer believes that both brightness phases
Meanwhile, the electric current and magnitude of voltage of corresponding dc source are recorded, then take 20 observers and correspond to respectively directly
The mean value of stream source current.
Step 4, by the photochromic electrical quantity comprehensive testers of a SSP6612LED and the 2nd SSP6612LED
Photochromic electrical quantity comprehensive tester is transferred to respectively on the gear of test light intensity, and DC driven LED is tested respectively
The light intensity value of light source and pulsed drive LED/light source, and record data；First SSP6612LED
Photochromic electrical quantity comprehensive tester can directly read the light intensity value of the DC driven LED/light source；It is described
The measured value of the photochromic electrical quantity comprehensive testers of the 2nd SSP6612LED is that the pulse is driven in the time of integration
The mean value I of dynamic LED/light source light intensityp,Its time of integration is T=20ms；
Mean value calculation described in step 5 and then step 4 goes out the light of pulsed drive LED/light source 21
Strong maximum Imax, i.e.,D is the dutycycle of pulsed drive
τ is the pulse shock time, and T is the pulsed drive cycle.
The testing research and computational methods of the efficient intensity of low frequency flash lamp, Blondel are combined by the maximum
The corrected Calculation of-Rey methods, FormFactor methods and Allard methods.
Allard proposes a kind of method of the Equipnal light intensity for calculating light pulse, as shown in fig. 6, the method
It is middle using human eye to the photoreception intensity of flash pulse as the time function.
I (t) is the instantaneous efficient intensity that human eye feels light pulse, and I (t) is the light intensity of instantaneous light pulse, and a is normal
Number.Wherein i (t) is the convolution of I (t) and vision impulse response function q (t), is expressed as
I (t)=I (t) × q (t)
For rectangle light pulse of the pulse duration less than 1s, the result of the method is bigger than normal to be seldom used.
Therefore, Ohno et al. proposes a kind of Allard methods of amendment, and the expression formula of q (t) is revised as：
Whereinw1+w2=1；A=0.2.One optimization solution is a1=0.113, a2=0.869,
w1=w2=0.5.Then above-mentioned equation is：
It is constant I within the attack time to be for rectangular pulse I (t), then i (t) is represented by
Wherein τ is the pulse shock time, and T is the pulse period, its visual attenuation constant a is obtained, by Matlab
Convolution fitting is carried out to pulsed optical signals and visual attenuation function, the photopic luminosity curve of pulsed light is obtained,
And Talbot laws are corrected using human eye vision inert characteristic, further combined with the light of LED
Electrical characteristics, the lifting multiple of the human eye brightness perception level to LED under pulsed drive and DC driven enters
Row compares, i.e. the lifting multiple of the brightness perception level under pulsed drive and DC driven.
Further, in the step 2, after stable light is sent out, the first oscillograph is transferred to into 2V gears,
Second oscillograph is transferred on 200mV gears, and the first oscillograph can be the total voltage U of display circuit and accounting for
Than D, the second oscillograph can show the voltage U at small resistor two ends to skyR, occur by adjusting data signal
The current potential of device, amplitude and dutycycle knob, make two waveforms of the first oscillograph and the second oscilloscope display
The synchronous same-phase of figure, then read voltage numerical value U and U respectivelyR, so pulsed drive LED/light source
The computing formula of power P isR is the resistance of small resistor.
Further, resistance R of described small resistor is 1 Ω.
Further, the pulse frequency is 50Hz to 400Hz.
Further, to be 1W high-power for the DC driven LED/light source and pulsed drive LED/light source
Warm white LED.
Further, dutycycle τ is 20%-80%.
A kind of device for test analysis LED visual brightnesses under pulse or DC driven, including：Each
Independent DC circuit and impulse circuit；
Described DC circuit includes dc source, DC driven LED/light source, first integral ball and first
The photochromic electrical quantity comprehensive testers of SSP6612LED, described dc source and DC driven LED/light source
Two ends are of coupled connections, and described DC driven LED/light source is arranged at the first integral ball centre of sphere, described
The photochromic electrical quantity comprehensive testers of first SSP6612LED are arranged on the output of described first integral ball
End；
Described impulse circuit include digital signal generator, pulsed drive LED/light source, second integral ball,
The photochromic electrical quantity comprehensive testers of 2nd SSP6612LED, small resistor, the first oscillograph and the second oscillography
Device, described pulsed drive LED/light source and small resistor series circuit in series, described data signal
Generator is of coupled connections with series circuit two ends, and described pulsed drive LED/light source is arranged on second integral
At the ball centre of sphere, described photochromic electrical quantity comprehensive testers of the 2nd SSP6612LED are arranged on described the
The output end of two integrating spheres, the first described oscilloscope coupling is connected to the digital signal generator two ends,
The second described oscilloscope coupling is connected to the small resistor two ends.
Further, resistance R of described small resistor is 1 Ω.
Further, to be 1W high-power warm for the DC driven LED/light source and pulsed drive LED/light source
White LEDs, colour temperature is 3200-3500K.
Further, described first integral ball and the diameter of second integral ball is 0.3m.
Beneficial effect：Disclosure of the invention for test analysis under pulse or DC driven LED visions
The method and device of brightness, can depict photopic luminosity curve, and the curve is integrated, and obtain
The integral area for arriving is human eye subjective vision brightness, is compared with the brightness perception level under DC case,
Can analyze in different dutycycles, the visual brightness situation of DC case and pulse situation.
Description of the drawings
Fig. 1 is a kind of method for test analysis LED visual brightnesses under pulse or DC driven of the present invention
Schematic flow sheet；
Fig. 2 is the structural representation of DC circuit of the present invention；
Fig. 3 is the structural representation of impulse circuit of the present invention；
Fig. 4 is the light pulse brightness curve that the present invention acts on human eye；
Fig. 5 is photopic luminosity curve of the present invention；
Fig. 6 is Allard method efficient intensity schematic diagrames.
In figure, 10, dc source, 11, DC driven LED/light source, 12, first integral ball, 13,
The photochromic electrical quantity comprehensive testers of first SSP6612LED, 20, digital signal generator, 21, pulse
Drive LED/light source, 22, second integral ball, the photochromic electrical quantitys of the 23, the 2nd SSP6612LED are comprehensively surveyed
Examination instrument, 24, small resistor, the 25, first oscillograph, the 26, second oscillograph.
Specific embodiment
As in specification and claim some vocabulary used in censuring specific components.This area skill
Art personnel are, it is to be appreciated that hardware manufacturer may call same component with different nouns.This explanation
Book and claim not in the way of the difference of title is used as distinguishing component, but with component in function
On difference be used as distinguish criterion.Such as " the bag in specification in the whole text and claim mentioned in
Include " it is an open language, therefore should be construed to " including but not limited to ".Specification subsequent descriptions are enforcement
The better embodiment of the present invention, for the purpose of so the description is to illustrate the rule of the present invention, and
It is not used to limit the scope of the present invention.Protection scope of the present invention when regard the claims person of defining as
It is accurate.
The present invention is described in further detail below in conjunction with accompanying drawing, but it is not as a limitation of the invention.
Embodiment 1
As shown in figure 1, a kind of method for test analysis LED visual brightnesses under pulse or DC driven,
Comprise the following steps：
Step one, as shown in Fig. 2 connection DC circuit, by dc source 10 and DC driven LED light
The two ends of source 11 are of coupled connections, and described DC driven LED/light source 11 is arranged on into first integral ball 12
At the centre of sphere, the photochromic electrical quantity comprehensive testers 13 of a SSP6612LED are arranged on into described first
The output end of integrating sphere 12；
Step 2, connect impulse circuit as shown in Figure 3, by pulsed drive LED/light source 21 and small resistor
24 series circuits in series, digital signal generator 20 is of coupled connections with series circuit two ends, will
Described pulsed drive LED/light source 21 is arranged at the centre of sphere of second integral ball 22, by second
The photochromic electrical quantity comprehensive testers 23 of SSP6612LED are arranged on the output of described second integral ball 22
End, the first oscillograph 25 is of coupled connections at the two ends of the digital signal generator 20, by the second oscillography
Device 26 is of coupled connections at the two ends of the small resistor 24, and the digital signal generator 20 is output as rectangle arteries and veins
Signal is rushed, its pulse frequency is not less than 50Hz, and by the oscillograph of first oscillograph 25 and second
26 voltages for showing calculate the power output of the digital signal generator 20；
Step 3, employing " Demographics' method ", randomly choose 20 observers, and every observer adopts
Identical observational technique is used, i.e.,：Data signal is kept to occur during the observation of certain fixed duty cycle
Device 20 drives parameter constant, the magnitude of voltage of constantly regulate dc source 10, until viewer believes that both
When brightness is identical, the electric current and magnitude of voltage of corresponding dc source 10 is recorded, then take 20 observers
The mean value of the electric current of dc source 10 is corresponded to respectively.
Step 4, by the photochromic electrical quantity comprehensive testers 13 and second of a SSP6612LED
The photochromic electrical quantity comprehensive testers 23 of SSP6612LED are transferred to respectively on the gear of test light intensity, are surveyed respectively
The light intensity value of examination DC driven LED/light source 11 and pulsed drive LED/light source 21, and record data；
The photochromic electrical quantity comprehensive tester 13 of first SSP6612LED can directly read the direct current and drive
The light intensity value of dynamic LED/light source 11；The photochromic electrical quantity comprehensive tester 23 of 2nd SSP6612LED
Measured value be the light intensity of pulsed drive LED/light source 21 in the time of integration mean value Ip,Its time of integration is 20ms；
Mean value calculation described in step 5 and then step 4 goes out the light of pulsed drive LED/light source 21
Strong maximum Imax, i.e.,D is the dutycycle of pulsed drive
τ is the pulse shock time, and T is the pulsed drive cycle.
The testing research and computational methods of the efficient intensity of low frequency flash lamp, Blondel are combined by the maximum
The corrected Calculation of-Rey methods, FormFactor methods and Allard methods.
Allard proposes a kind of method of the Equipnal light intensity for calculating light pulse, as shown in fig. 6, the method
It is middle using human eye to the photoreception intensity of flash pulse as the time function.
I (t) is the instantaneous efficient intensity that human eye feels light pulse, and I (t) is the light intensity of instantaneous light pulse, and a is normal
Number.Wherein i (t) is the convolution of I (t) and vision impulse response function q (t), is expressed as
I (t)=I (t) × q (t)
For rectangle light pulse of the pulse duration less than 1s, the result of the method is bigger than normal to be seldom used.
Therefore, Ohno et al. proposes a kind of Allard methods of amendment, and the expression formula of q (t) is revised as：
Whereinw1+w2=1；A=0.2.One optimization solution is a1=0.113, a2=0.869,
w1=w2=0.5.Then above-mentioned equation is：
It is constant I within the attack time to be for rectangular pulse I (t), then i (t) is represented by
Wherein τ is the pulse shock time, and T is the pulse period, its visual attenuation constant a is obtained, by Matlab
Convolution fitting is carried out to pulsed optical signals and visual attenuation function, the photopic luminosity curve of pulsed light is obtained,
And Talbot laws are corrected using human eye vision inert characteristic, further combined with the light of LED
Electrical characteristics, the lifting multiple β of the human eye brightness perception level to LED under pulsed drive and DC driven
It is compared, i.e. the lifting multiple of the brightness perception level under pulsed drive and DC driven.
For the average current value of " visual brightness " when consistent under DC driven, IpulseFor " vision is bright
The effective current value of pulsed drive when degree " is consistent.
After the light for acting on human eye suddenly disappears, simultaneously non-immediate disappears brightness sensation, but approximate by finger
Number rule declines and fades away.It is about in day mesopic vision 0.02 second, is 0.1 second during mesomeric vision,
It it is 0.2 second during night vision, mesomeric vision is the state between day vision and night vision.Human eye is bright
Degree feels that change lags behind intrinsic brilliance change, and eye storage characteristic, referred to as visual persistence.
Eyes, if frequency is not high, can produce the flicker of light and dark under periodic light pulse stimulation
Feel, long-term viewing is easily tired.If optical pulse frequency is brought up to more than certain certain value, due to regarding
Feel inertia, then will not again feel flicker, then the low-limit frequency for just not feeling flicker is referred to as critical sudden strain of a muscle
Bright frequency fc, it is mainly relevant with the brightness of light pulse.Calculating its empirical equation is
fc=9.61gLm+ 26.6 (Hz), L in formulamFor the high-high brightness of picture, unit is cd/m2, such as LmOne
As value be 100cd/m2, then critical flicker frequency f of human eyec=45.8Hz.
It is particularly preferred, in the step 2, after stable light is sent out, the first oscillograph 25 is transferred to
2V gears, the second oscillograph 26 is transferred on 200mV gears, and the first oscillograph 25 can be with display circuit
Total voltage U and dutycycle D, the second oscillograph 26 can show the voltage U at small resistor two endsR, lead to
Current potential, amplitude and the dutycycle knob of digital signal generator 20 are overregulated, the He of the first oscillograph 25 is made
Second oscillograph 26 show two oscillograms synchronization same-phase, then respectively read voltage numerical value U and
UR, so the computing formula of the power P of pulsed drive LED/light source 21 isR
For the resistance of small resistor.
Particularly preferred, resistance R of described small resistor is 1 Ω.
Particularly preferred, the pulse frequency is 50Hz to 400Hz.
Particularly preferred, the DC driven LED/light source 11 and pulsed drive LED/light source 21 are
High-power warm whites LED of 1W.
Particularly preferred, when " visual brightness " is consistent, pulse frequency is 100Hz, and dutycycle D is 20%-80%；
Direct current lifts multiple β such as following tables with the brightness perception level under pulsed drive：
Fig. 4 represents the light pulse brightness curve for acting on human eye, and Fig. 5 represents that visual brightness feels that it is delayed
Visual persistence is formed in actual light pulse brightness, τ-T are the retentivity time of eye.When pulse frequency or duty
Than increase when, the integral area of τ-T with reduction, when it increases to certain value, the integration face of τ-T
Product is little to ignoring, and the effective brightness under pulsed drive is with DC driven be close to equal.
From Talbot laws, if pulse frequency is very fast, light can be ignored and persist the time in human eye,
The then mean value feeling be intrinsic brilliance of the human eye to brightness, i.e.,：
L (t) is the change curve of intrinsic brilliance in formula, and τ is the pulse shock time, and T is light period of change.
The preferred pulse frequency of the present embodiment is 100Hz, closely the critical frequency of human eye, it is impossible to suddenly
Omit retentivity time of eye of the human eye to brightness.So, it is impossible to Talbot laws are simply applied, will be actual
The mean value of brightness as human eye " visual brightness " value, and the visual brightness of entirety be felt as it is actual bright
Degree and the retentivity time of eye under brightness and.
Then Talbot equations are modified to：
LpL is the visual brightness attenuation curve of retentivity time of eye section in formula.First integral value is light pulse punching in formula
The visual brightness hit in the time, second integral value is the visual brightness in the retentivity time of eye.
When pulse duty factor than it is relatively low when (D<80%), second integrated value in above formula is in each arteries and veins
Rush in the cycle, make to stimulate the brightness of human eye in 0-τ times and continue to keep higher in τ-T time
Level, the overall brightness for being effectively increased human eye is felt.Although the luminous flux under pulsed drive substantially compares
Low in the case of DC driven, its " visual brightness " but can reach unanimously.So as to explain arteries and veins well
Punching drives the phenomenon of the human eye " visual brightness " that can improve white light LEDs；With the increase of dutycycle,
This brightness improves ability and is gradually lowered, the impulse waveform that PWM drives start it is convergent with constant current waveform,
Raising of the pulsed drive to " visual brightness " under high duty ratio be not obvious, so attached in D=80%
Luminous flux under nearly pulse and DC driven tends to equal.Work as D>When 80%, under corresponding DC driven
The temperature of LED is too high, causes radiation recombination efficiency of the LED chip in luminous zone to reduce；And electric current
Increase may make carrier diffusion go out gesture well, it is impossible to effectively give off photon, cause its luminous efficiency drop
Low, irradiation luminous flux declines.Its result verification, pulsed drive can effectively improve the quantum of LED
Efficiency, the saturation point of current density and " visual brightness ".
Embodiment 2
A kind of device for test analysis LED visual brightnesses under pulse or DC driven, including：Each
Independent DC circuit and impulse circuit；
As shown in Fig. 2 described DC circuit include dc source 10, DC driven LED/light source 11,
The photochromic electrical quantity comprehensive testers 13 of the SSP6612LED of first integral ball 12 and the, described direct current
Power supply 10 is of coupled connections with the two ends of DC driven LED/light source 11, described DC driven LED/light source
11 are arranged at the centre of sphere of first integral ball 12, the described photochromic electrical quantity synthesis of a SSP6612LED
Tester 13 is arranged on the output end of described first integral ball 12.
As shown in figure 3, described impulse circuit includes digital signal generator 20, pulsed drive LED light
Source 21, second integral ball 22, the photochromic electrical quantity comprehensive testers 23 of the 2nd SSP6612LED, little electricity
Resistance the 24, first oscillograph 25 and the second oscillograph 26, described pulsed drive LED/light source 21 with it is little
The series circuit in series of resistance 24, described digital signal generator 20 is coupled with series circuit two ends
Connection, described pulsed drive LED/light source 21 is arranged at the centre of sphere of second integral ball 22, and described the
The photochromic electrical quantity comprehensive testers 23 of two SSP6612LED are arranged on the defeated of described second integral ball 22
Go out end, the first described oscillograph 25 is of coupled connections at the two ends of the digital signal generator 20, described
The second oscillograph 26 be of coupled connections at the two ends of the small resistor 24.
Particularly preferred, resistance R of described small resistor is 1 Ω.
Particularly preferred, it is big that the DC driven LED/light source 11 and pulsed drive LED/light source 21 are 1W
Power warm white LED, colour temperature is 3200-3500K.
Particularly preferred, described first integral ball 12 and the diameter of second integral ball 22 is 0.3m.
The method for test analysis LED visual brightnesses under pulse or DC driven of disclosure of the invention
And device, photopic luminosity curve can be depicted, the curve is integrated, the integration face for obtaining
Product is human eye subjective vision brightness, is compared with the brightness perception level under DC case, can be analyzed
Go out in different dutycycles, the visual brightness situation of DC case and pulse situation.
Described above illustrates and describes some preferred embodiments of the present invention, but as it was previously stated, should manage
The solution present invention is not limited to form disclosed herein, is not to be taken as the exclusion to other embodiment,
And can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein,
It is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are carried out changes
Dynamic and change, then all should be in the protection of claims of the present invention without departing from the spirit and scope of the present invention
In the range of.
Claims (10)
1. a kind of method for test analysis LED visual brightnesses under pulse or DC driven, its feature
It is to comprise the following steps：
Step one, connection DC circuit, by dc source (10) and DC driven LED/light source (11)
Two ends are of coupled connections, and described DC driven LED/light source (11) is arranged on into first integral ball (12)
At the centre of sphere, by the photochromic electrical quantity comprehensive testers (13) of a SSP6612LED installed in described
The output end of one integrating sphere (12)；
Step 2, connection impulse circuit, pulsed drive LED/light source (21) and small resistor (24) are gone here and there
Connection constitutes series circuit, digital signal generator (20) and series circuit two ends is of coupled connections, by institute
The pulsed drive LED/light source (21) stated is arranged at second integral ball (22) centre of sphere, by second
The photochromic electrical quantity comprehensive testers (23) of SSP6612LED are installed in described second integral ball (22)
Output end, the first oscillograph (25) is of coupled connections at the digital signal generator (20) two ends,
Second oscillograph (26) is of coupled connections at the small resistor (24) two ends, the data signal occurs
Device (20) is output as rectangular pulse signal, and its pulse frequency is not less than 50Hz, and shows by described first
The voltage that ripple device (25) and the second oscillograph (26) show calculates the digital signal generator (20)
Power output；
Step 3, employing " Demographics' method ", randomly choose 20 observers, and every observer adopts
Identical observational technique is used, i.e.,：Data signal is kept to occur during the observation of certain fixed duty cycle
Device (20) drives parameter constant, the magnitude of voltage of constantly regulate dc source (10), until observer recognizes
For both brightness it is identical when, record the electric current and magnitude of voltage of corresponding dc source (10), then take 20
Name observer corresponds to respectively the mean value of dc source (10) electric current.
Step 4, by the photochromic electrical quantity comprehensive testers (13) of a SSP6612LED and second
The photochromic electrical quantity comprehensive testers (23) of SSP6612LED are transferred to respectively on the gear of test light intensity, point
Not Ce Shi DC driven LED/light source (11) and pulsed drive LED/light source (21) light intensity value, and
Record data；The photochromic electrical quantity comprehensive tester (13) of first SSP6612LED can directly read
Take the light intensity value of the DC driven LED/light source (11)；The photochromic electricity of 2nd SSP6612LED
The measured value of parametric synthesis tester (23) is the pulsed drive LED/light source (21) in the time of integration
The mean value I of light intensityp,Its time of integration is T=20ms；
Step 5 and then according to the mean value I described in step 4pCalculate the pulsed drive LED light
Maximum I of source (21) light intensitymax, i.e.,D is the dutycycle of pulsed drive
τ is the pulse shock time, and T is the pulsed drive cycle.
The testing research and computational methods of the efficient intensity of low frequency flash lamp, Blondel are combined by the maximum
The corrected Calculation of-Rey methods, Form Factor methods and Allard methods, obtains its visual attenuation constant a,
Convolution fitting is carried out to pulsed optical signals and visual attenuation function by Matlab, the vision of pulsed light is obtained
Brightness curve, and Talbot laws are corrected using human eye vision inert characteristic, further combined with
The photoelectric characteristic of LED, the human eye brightness perception level to LED under pulsed drive and DC driven
Lift multiple β to be compared, i.e. the lifting multiple of the brightness perception level under pulsed drive and DC driven.
For the average current value of " visual brightness " when consistent under DC driven, IpulseFor " visual brightness "
The effective current value of pulsed drive when consistent.
2. it is according to claim 1 for detecting pulse drive mode under LED visual brightnesses method,
Characterized in that, in the step 2, after stable light is sent out, the first oscillograph (25) is transferred to into 2V
Gear, the second oscillograph (26) is transferred on 200mV gears, and the first oscillograph (25) can show electricity
The total voltage U in road and dutycycle D, the second oscillograph (26) can show the voltage at small resistor two ends
UR, by the current potential, amplitude and the dutycycle knob that adjust digital signal generator (20), make first to show
Two oscillograms synchronization same-phase that ripple device (25) and the second oscillograph (26) show, then reads respectively
Take voltage value U and UR, so the computing formula of the power P of pulsed drive LED/light source (21) is R is the resistance of small resistor.
3. it is according to claim 2 for detecting pulse drive mode under LED visual brightnesses method,
Characterized in that, resistance R of described small resistor is 1 Ω.
4. it is according to claim 1 and 2 for detecting pulse drive mode under LED visual brightnesses
Method, it is characterised in that the pulse frequency is 50Hz to 400Hz.
5. it is according to claim 1 and 2 for detecting pulse drive mode under LED visual brightnesses
Method, it is characterised in that the DC driven LED/light source (11) and pulsed drive LED/light source (21)
It is high-power warm whites LED of 1W.
6. it is according to claim 1 and 2 for detecting pulse drive mode under LED visual brightnesses
Method, it is characterised in that dutycycle D is 20%-80%.
7. a kind of device for test analysis LED visual brightnesses under pulse or DC driven, its feature exists
In, including：Respective independent DC circuit and impulse circuit；
Described DC circuit include dc source (10), DC driven LED/light source (11), first
Integrating sphere (12) and the photochromic electrical quantity comprehensive testers (13) of a SSP6612LED, described is straight
Stream power supply (10) is of coupled connections with DC driven LED/light source (11) two ends, described DC driven
LED/light source (11) is arranged at first integral ball (12) centre of sphere, a described SSP6612LED
Photochromic electrical quantity comprehensive tester (13) is arranged on the output end of described first integral ball (12)；
Described impulse circuit include digital signal generator (20), pulsed drive LED/light source (21),
The photochromic electrical quantity comprehensive tester (23) of second integral ball (22), the 2nd SSP6612LED, little electricity
Resistance (24), the first oscillograph (25) and the second oscillograph (26), described pulsed drive LED light
Source (21) and small resistor (24) series circuit in series, described digital signal generator (20)
It is of coupled connections with series circuit two ends, described pulsed drive LED/light source (21) is arranged on second integral
At ball (22) centre of sphere, photochromic electrical quantity comprehensive tester (23) peaces of the 2nd described SSP6612LED
The output end of described second integral ball (22) is mounted in, described the first oscillograph (25) is of coupled connections
At the digital signal generator (20) two ends, described the second oscillograph (26) is of coupled connections in institute
State small resistor (24) two ends.
8. it is according to claim 7 for test analysis under pulse or DC driven LED visual brightnesses
Device, it is characterised in that resistance R of described small resistor be 1 Ω.
9. it is according to claim 7 for test analysis under pulse or DC driven LED visual brightnesses
Device, it is characterised in that the DC driven LED/light source (11) and pulsed drive LED/light source (21)
High-power warm whites LED of 1W are, colour temperature is 3200-3500K.
It is 10. according to claim 7 that for test analysis, LED visions are bright under pulse or DC driven
The device of degree, it is characterised in that described first integral ball (12) and second integral ball (22) it is straight
Footpath is 0.3m.
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