CN109211405B - Spectral analysis-based electric light source stroboscopic analysis method - Google Patents
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Abstract
The invention discloses an electric light source stroboscopic analysis method based on spectral analysis, which comprises the following steps: selecting a lamp to be tested, and collecting spectral distribution data; calculating a spectrum flicker ratio, comparing the spectrum flicker ratio with the signal-to-noise ratio of the spectrometer, preliminarily judging whether stroboflash exists or not, and if the stroboflash does not meet the conditions, continuing to analyze; calculating the relative luminous flux corresponding to not less than 50 groups of spectral distributions; fitting a function expression of the relative luminous flux R (t), calculating the flicker frequency f and the visual flicker percentage, judging the stroboscopic condition of the lamp according to the flicker frequency f and the visual flicker percentage, outputting the flicker frequency of the lamp and the visual flicker percentage, and finishing the analysis. The method can carry out the stroboscopic quantitative analysis of the electric light source only by utilizing the spectrometer which is the most basic and popular device for optical research and analysis, and the related calculation parameters and the process physical significance are definite.
Description
Technical Field
The invention relates to the field of health illumination, in particular to an electric light source stroboscopic analysis method based on spectral analysis.
Background
The stroboflash of the electric light source means that light emitted by the electric light source is changed rapidly and repeatedly along with time, so that the light source is jumped and unstable, and the fluctuation of the luminous flux of the light source is caused. The stroboscopic reason of the electric light source is mainly as follows: low power supply frequency of the light source, large voltage fluctuation, light emitting principle of the light source and the like. Current research shows that the hazards of stroboscopic electrical light sources are mainly: the industrial accidents are caused by the illusion; induce epilepsy, migraine, nausea, etc. in people with photosensitivity; the glasses of the teenagers are injured, and the myopia is caused.
Along with the attention of people to light health, when purchasing electric light sources, many consumers can utilize the cell-phone to shoot or make a video recording under the state, aim at target electric light source, through whether appear stripe or the different scintillation of light and shade on the observation screen, judge whether the electric light source that surveys has the stroboscopic phenomenon. The method can only roughly judge qualitatively and cannot accurately and quantitatively research the stroboscopic phenomenon of the electric light source. Authorities such as IEEE often quantitatively research the stroboscopic phenomenon of the electric light source by measuring the change of the illuminance of the electric light source with time, calculating the flicker index, the stroboscopic depth, the modulation depth, the fluctuation depth and the like. However, the method needs a light source stroboscopic tester, a digital oscilloscope and the like, and the equipment is relatively expensive and has low popularization degree.
Therefore, the method adopts a spectrometer to collect transient spectral distribution data of a detected light source within a certain time at high frequency, and preliminarily judges the stroboscopic condition of the light source according to the peak flicker of the spectral distribution; and then, a photopic vision spectral light efficiency function V (lambda) is utilized, the relative light intensity flicker condition and frequency observed by human eyes are calculated through Matlab fitting, the stroboscopic condition of the electric light source is analyzed in detail, expensive professional equipment such as a light source stroboscopic tester can be effectively avoided, and the method has important significance.
Disclosure of Invention
The invention aims to realize quantitative analysis of an electric light source stroboscopic phenomenon based on spectral analysis by using a common spectrometer, and provides the method that firstly, a spectrum flicker ratio is calculated through transient spectral distribution data to preliminarily judge whether a tested electric light source has stroboscopic phenomenon or not; then, according to the luminous efficiency function of the combined photopic vision spectrum, by adopting Fourier series fitting of not less than 8 orders, the flicker frequency and the visual flicker percentage are calculated to quantitatively analyze the electric light source stroboscopy; and finally, judging whether the electric light source has stroboflash or not by the corresponding threshold value.
The invention is realized by the following technical scheme.
An electric light source stroboscopic analysis method based on spectral analysis comprises the following steps:
step 3, calculating the relative luminous flux R (t) corresponding to no less than 50 groups of spectral distributions P (lambda):
fitting a photopic vision spectral optical efficiency function V (lambda) given by CIE (International Commission on illumination) by using an originPro software and by using an Asym2Sig function, calculating a function value with the same scanning step length as the spectral distribution P (lambda) according to a fitting expression of the photopic vision spectral optical efficiency function V (lambda) by using an Excel software, and calculating not less than 50 groups of P (lambda) × V (lambda), and calculating not less than 50 relative luminous fluxes R (t) by using an integral function of the originPro software;
step 4, fitting a function expression of the relative luminous flux R (t), and calculating the flicker frequency f and the visual flicker percentage VFP;
and 5, judging the stroboscopic condition of the lamp according to the flicker frequency f and the visual flicker percentage VFP:
if f is more than or equal to 400Hz or VFP is less than or equal to 1 percent, the lamp has no stroboflash and the analysis is finished;
if f is less than 400Hz or VFP is more than 1%, the lamp has stroboflash, the lamp flicker frequency f and the visual flicker percentage VFP are output, and the analysis is finished.
With respect to the above technical solutions, the present invention has a further preferable solution:
further, in the step 1), the data of the spectral distribution P (λ) is acquired by the following steps:
1a) selecting a lamp to be researched, and enabling the lamp to normally work under 220V and 50Hz mains supply;
1b) and (3) acquiring the spectral distribution P (lambda) data of the 380-780nm visible light band of the tested lamp within not less than 50ms by using a high-frequency spectrometer in a dark room, wherein the integration time is not more than 1ms, and obtaining not less than 50 groups of spectral distribution P (lambda) data.
Further, in the step 2), the spectral flicker ratio SFP is calculated by:
2a) drawing not less than 50 groups of spectral distributions P (lambda) in a graph by using originPro, Matlab and Excel software;
2b) not less than 50 spectral components are foundMaximum peak value P (λ) in cloth P (λ)maxAnd the minimum peak value P (λ) in not less than 50 sets of spectral distributions P (λ)min；
2c) The spectral flicker ratio SFP of the luminaire is calculated using equation (1).
Further, the step 4) is carried out according to the following process:
4a) fitting a function expression relative to the luminous flux R (t) by using a cftool box in Matlab software and adopting a Fourier series not less than 8 orders;
4b) plotting by OriginPro software according to the functional expression of the relative luminous flux R (t), the time t corresponding to the oscillation period1And t2Calculating the flicker frequency f to be 1/(t)2-t1)；
4c) Finding the maximum value R (t) of the relative luminous flux R (t) from the function image of the relative luminous flux R (t)maxWith a minimum value of R (t)minAnd calculating the visual flicker percentage VFP.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the analysis method can quickly and intuitively observe the stroboscopic condition of the electric light source through not less than 50 groups of spectral distribution P (lambda), and can simply and preliminarily judge the stroboscopic condition of the electric light source by calculating the spectral flicker ratio SFP. The photopic vision spectral light efficiency function V (lambda), the relative luminous flux R (t) and the function expression thereof are fitted, and the flicker frequency f and the visual flicker percentage VFP are calculated, so that the situation that a light source stroboscopic tester, a digital oscilloscope and other equipment are required to be utilized for the stroboscopic quantitative analysis of the electric light source can be effectively avoided. The method can carry out the stroboscopic quantitative analysis of the electric light source only by utilizing the spectrometer which is the most basic and popular device for optical research and analysis, and the related calculation parameters and the process physical significance are definite.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a flow chart of a method for electric light source strobe study based on spectral analysis;
FIG. 2 is a diagram of the distribution P (λ) of the 50-set spectrum in the 380-780nm band of the incandescent lamp;
FIG. 3 is a graph of 50R (t) incandescent lamps and their Fourier series fit;
FIG. 4 shows the distribution P (λ) of the light spectrum of 50 sets of wavelength bands of 380-780nm of the LED filament lamp and a partial enlarged view thereof;
FIG. 5 is a graph of 50R (t) LED filament lamps and their Fourier series fit;
FIG. 6 is a diagram of a 380-780nm band 50 set of spectral distributions P (λ) of a tungsten iodide lamp and a partial enlarged view thereof;
FIG. 7 is a graph of 50R (t) s for a tungsten iodine lamp and a Fourier series fit thereto.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
Example 1:
in this embodiment, the stroboflash of a 20W incandescent lamp in a normal working process under a commercial power of 220V and 50Hz is analyzed by the method, which comprises the following steps: see fig. 1, 2, 3.
1a) selecting a 20W incandescent lamp as a lamp to be tested, and enabling the lamp to normally work under 220V and 50Hz mains supply;
1b) in a dark room, an Ocean Optics UBS2000+ type spectrometer of American Ocean Optics company is utilized, the integration time is 1ms, and 380-.
2a) drawing 50 groups of spectral distributions P (lambda) in a graph by utilizing originPro, Matlab, Excel and other software;
2b) find the maximum peak P (λ) of the 50 sets of spectral distributions P (λ)maxAnd the minimum peak P (λ) in the 50 sets of spectral distributions P (λ)min50356 and 30073;
2c) the spectral flicker ratio SFP of the lamp was calculated to be 50.44% using equation (6).
2d) The signal-to-noise ratio SNR of the Ocean Optics UBS2000+ type spectrometer of Ocean Optics corporation, USA, is 0.4%, and the SFP is more than 3 × SNR, and the analysis is continued.
Step 3, calculating the relative luminous flux R (t) corresponding to the 50 sets of spectral distributions P (lambda):
3a) the photopic vision spectral optical efficiency function V (lambda) given by CIE (International Commission on illumination) in 1924 is fitted by using the AliginPro software and by using the Asym2Sig function, the fitting result is formula (7), and the correlation coefficient R2＝0.99903
3b) Using Excel software, a function value of 0.37nm for the same scanning step as the spectral distribution P (λ) was calculated from a fitting expression of the photopic vision spectral optical efficiency function V (λ), and 50 sets of P (λ) × V (λ) were calculated.
3c) Calculating 50 relative luminous fluxes R (t) of the incandescent lamp by using the Integrate function of originPro software, and calculating the formula shown in the formula (8)
And 4, fitting a function expression of the 50 relative luminous fluxes R (t) of the incandescent lamp along with time, and calculating the flicker frequency f and the visual flicker percentage VFP:
4a) utilizing a cftool kit in Matlab software, adopting 8-order Fourier series to fit a function expression of 50 relative luminous fluxes R (t) of the incandescent lamp, wherein the fitting result is shown as a formula (9), and a correlation coefficient R20.8993, rms error RMSE 4.038 × 103
4b) Table of functions according to relative luminous fluxes R (t)Drawing Fourier series fitting images of the incandescent lamp relative luminous flux R (t) by utilizing originPro software, and determining the corresponding t in one period by the Fourier series fitting of the incandescent lamp2And t1，t2＝32.4ms、t119.5ms, the incandescent lamp flicker frequency f is calculated to be 1/(t)2-t1)＝77.52Hz。
4c) Finding the maximum value of amplitude R (t) from the image of the incandescent lamp as a function of the relative luminous flux R (t)maxWith a minimum value of R (t)min，R(t)max＝4558034、R(t)min1616767. Calculating the visual flicker percentage VFP 95.27%, and calculating the formula (10)
And 5, judging the stroboscopic condition of the incandescent lamp according to the flicker frequency f and the visual flicker percentage VFP:
because VFP 95.27% > 1%, the lamp had stroboscopic, output incandescent lamp flicker frequency f 77.52Hz, visual flicker percentage VFP 95.27%, and the analysis was complete.
Example 2:
in this embodiment, the stroboflash of the 20W LED filament lamp in the normal working process under the commercial power of 220V and 50Hz is analyzed by the present invention, and the specific steps are as follows: see fig. 1, 4, 5.
1a) selecting a 20W LED filament lamp of a certain well-known enterprise in the world as a lamp to be tested, and enabling the lamp to normally work under 220V and 50Hz mains supply;
1b) in a darkroom, an FX2000 fiber spectrometer of Shanghai shared optics Limited is utilized, the integration time is 1ms, and 380-780nm visible light waveband spectral distribution P (lambda) data, namely 50 groups of spectral distribution P (lambda) data, in 50ms of the LED filament lamp are collected.
2a) drawing 50 groups of spectral distributions P (lambda) in a graph by utilizing originPro, Matlab, Excel and other software;
2b) the spectral distribution of the LED filament lamp is locally amplified, and the maximum peak value P (lambda) in 50 groups of spectral distributions P (lambda) is foundmaxAnd the minimum peak P (λ) in the 50 sets of spectral distributions P (λ)min55463, 54295, respectively;
2c) the spectral flicker ratio SFP of the lamp was calculated to be 2.13% using equation (11).
2d) The signal-to-noise ratio SNR of the FX2000 fiber spectrometer (FX-Industrie, Inc.) is 0.25%, and the SFP > 3 × SNR, and the analysis was continued.
Step 3, calculating the relative luminous flux R (t) corresponding to the 50 sets of spectral distributions P (lambda):
3a) the photopic vision spectral optical efficiency function V (lambda) given by CIE (International Commission on illumination) in 1924 is fitted by using the AliginPro software and by using the Asym2Sig function, the fitting result is formula (12), and the correlation coefficient R2＝0.99903
3b) Using Excel software, a function value of 0.31nm for the same scanning step as the spectral distribution P (λ) was calculated from a fitting expression of the photopic vision spectral optical efficiency function V (λ), and 50 sets of P (λ) × V (λ) were calculated.
3c) Calculating 50 relative luminous fluxes R (t) of the LED filament lamp by using the Integrate function of originPro software, and calculating the formula (13)
And 4, fitting a function expression of 50 relative luminous fluxes R (t) of the LED filament lamp, and calculating a flicker frequency f and a visual flicker percentage VFP:
4a) utilizing a cftool kit in Matlab software, adopting 8-order Fourier series to fit a function expression of 50 relative luminous fluxes R (t) of the LED filament lamp, and obtaining a fitting resultSee formula (14), correlation coefficient R20.8623 root mean square error RMSE 439.8
4b) Drawing a Fourier series fitting image of the relative luminous flux R (t) of the LED filament lamp by utilizing originPro software according to a function expression (14) of the R (t) of the LED filament lamp, and determining the corresponding t in one period by Fourier series fitting of the LED filament lamp2And t1，t2＝23.2ms、t138.1ms, calculating the flicker frequency f of the LED filament lamp to be 1/(t)2-t1)＝67.11Hz。
4c) Finding the maximum value of amplitude R (t) from the function image of relative luminous flux R (t) of the LED filament lampmaxWith a minimum value of R (t)min，R(t)max＝4119260、R(t)min4098905. Calculating the visual flicker percentage VFP as 0.50%, and calculating the formula (15)
since VFP is 0.50% < 1%, the LED filament lamp was not stroboscopic and the analysis was completed.
Example 3:
in this embodiment, the method for analyzing the stroboflash of the 20W iodine-tungsten lamp in the normal working process under the commercial power of 220V and 50Hz comprises the following specific steps: see fig. 1, 6, 7.
1a) selecting a 20W iodine tungsten lamp of a certain large enterprise in China as a lamp to be tested, and enabling the lamp to normally work under 220V and 50Hz mains supply;
1b) in a darkroom, an Ocean Optics UBS2000+ type spectrometer of American Ocean Optics company is utilized, the integration time is 1ms, and 380-780nm visible light waveband spectral distribution P (lambda) data in 50ms of a tungsten iodine lamp, namely 50 groups of spectral distribution P (lambda) data, are collected.
2a) drawing 50 groups of spectral distributions P (lambda) in a graph by utilizing originPro, Matlab, Excel and other software;
2b) the spectral distribution of the iodine-tungsten lamp is locally amplified, and the maximum peak value P (lambda) in 50 groups of spectral distributions P (lambda) is foundmaxAnd the minimum peak P (λ) in the 50 sets of spectral distributions P (λ)minThe numerical values are 55056 and 52992 respectively;
2c) the spectral flicker ratio SFP of the iodine tungsten lamp was calculated to be 3.82% using equation (16).
2d) The signal-to-noise ratio SNR of the Ocean Optics UBS2000+ type spectrometer of Ocean Optics corporation, USA, is 0.4%, and the SFP is more than 3 × SNR, so that the analysis is required to be continued.
Step 3, calculating the relative luminous flux R (t) corresponding to the spectral distribution P (lambda) of the 50 groups of the iodine-tungsten lamp:
3a) the photopic vision spectral optical efficiency function V (lambda) given by CIE (International Commission on illumination) in 1924 is fitted by using the Asym2Sig function through originPro software, the fitting result is formula (17), and the correlation coefficient R2＝0.99903
3b) Using Excel software, a function value of 0.37nm for the same scanning step as the spectral distribution P (λ) was calculated from a fitting expression of the photopic vision spectral optical efficiency function V (λ), and 50 sets of P (λ) × V (λ) were calculated.
3c) Calculating 50 relative luminous flux R (t) of the iodine-tungsten lamp by utilizing the Integrate function of originPro software, and calculating the formula (18)
And 4, fitting a function expression of 50 relative luminous fluxes R (t) of the iodine tungsten lamp, and calculating the flicker frequency f and the visual flicker percentage VFP:
4a) utilizing a cftool kit in Matlab software, adopting 8-order Fourier series to fit a function expression of 50 relative luminous fluxes R (t) of the iodine-tungsten lamp, wherein the fitting result is shown in a formula (19), and the correlation coefficient R20.8724, rms error RMSE 2431.
4b) Drawing a Fourier series fitting image of the relative luminous flux R (t) of the iodine tungsten lamp by utilizing originPro software according to a functional expression (19) of the relative luminous flux R (t) of the iodine tungsten lamp, and determining the corresponding t in one period by Fourier series fitting of the iodine tungsten lamp2And t1，t2＝32.4ms、t127.2ms, calculating the flickering frequency f of the iodine-tungsten lamp to be 1/(t)2-t1)＝192.31Hz。
4c) Finding the maximum value of amplitude R (t) from the function image of relative luminous flux R (t) of the iodine tungsten lampmaxWith a minimum value of R (t)min，R(t)max＝4600707、R(t)min4426747. Calculating the visual flicker percentage VFP is 3.85%, and the calculation formula is shown in the formula (15)
because f is 192.31<400Hz and VFP is 3.85% > 1%, the iodine-tungsten lamp has stroboflash, the flickering frequency f of the iodine-tungsten lamp is 192.31, and the visual flickering percentage VFP is 3.85%. And (5) finishing the analysis.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (4)
1. An electric light source stroboscopic analysis method based on spectral analysis is characterized by comprising the following steps:
step 1, selecting a lamp to be tested, and collecting spectral distribution P (lambda) data;
step 2, calculating a spectral flicker ratio SFP, comparing the spectral flicker ratio SFP with a signal-to-noise ratio SNR of a spectrometer, preliminarily judging whether stroboflash exists or not, if the SFP is less than or equal to 3 × SNR, judging that the lamp has no stroboflash, finishing the analysis, and if the SFP is more than 3 × SNR, continuing the analysis;
the spectral flicker ratio SFP is calculated by the following steps:
2a) drawing not less than 50 groups of spectral distributions P (lambda) in a graph by using originPro, Matlab or Excel software;
2b) finding the maximum peak P (λ) among not less than 50 sets of spectral distributions P (λ)maxAnd the minimum peak value P (λ) in not less than 50 sets of spectral distributions P (λ)min；
2c) Calculating the spectral flicker ratio SFP of the lamp by using the formula (1)
Step 3, calculating the relative luminous flux R (t) corresponding to no less than 50 groups of spectral distributions P (lambda):
fitting a photopic vision spectral optical efficiency function V (lambda) given by the International Commission on illumination by using an Asym2Sig function through originPro software, calculating a function value with the same scanning step length as the spectral distribution P (lambda) according to a fitting expression of the photopic vision spectral optical efficiency function V (lambda) by using Excel software, and calculating not less than 50 groups of P (lambda) × V (lambda), and calculating not less than 50 relative luminous fluxes R (t) by using an integration function of originPro software;
the relative luminous flux r (t) is calculated as a function of the following expression:
step 4, fitting a function expression of the relative luminous flux R (t), and calculating the flicker frequency f and the visual flicker percentage VFP;
wherein, R (t)maxIs the maximum value of R (t), R (t)minIs the minimum value of R (t);
and 5, judging the stroboscopic condition of the lamp according to the flicker frequency f and the visual flicker percentage VFP:
if f is more than or equal to 400Hz or VFP is less than or equal to 1 percent, the lamp has no stroboflash and the analysis is finished;
if f is less than 400Hz or VFP is more than 1%, the lamp has stroboflash, the lamp flicker frequency f and the visual flicker percentage VFP are output, and the analysis is finished.
2. The stroboscopic analysis method of electric light source based on spectrum analysis according to claim 1, wherein in step 1), the data of spectral distribution P (λ) is collected, and obtained by the following steps:
1a) selecting a lamp to be analyzed, and enabling the lamp to normally work under 220V and 50Hz mains supply;
1b) and (3) acquiring the spectral distribution P (lambda) data of the 380-780nm visible light band of the tested lamp within not less than 50ms by using a high-frequency spectrometer with the integration time not more than 1ms in a dark room to obtain not less than 50 groups of spectral distribution P (lambda) data.
3. The method of claim 1, wherein in step 3), the photopic vision spectral optical efficiency function V (λ) is fit to the expression as follows:
where the independent variable X corresponds to the wavelength λ in the photopic vision spectral optical efficiency function V (λ) and the dependent variable y corresponds to the photopic vision spectral optical efficiency function V (λ), y0、A、Xc、W1、W2、W3Is the coefficient to be determined.
4. The stroboscopic analysis method of electric light source based on spectral analysis according to claim 1, characterized in that the step 4) is performed as follows:
4a) using a cftool kit in Matlab software, fitting a functional expression relative to the luminous flux R (t) by using an 8-order Fourier series, wherein the fitting formula is shown in a formula (4)
Where x is the wavelength t at which the independent variable corresponds to the relative luminous flux R (t), Y is the dependent variable corresponds to the relative luminous flux R (t), a0、ai、biW is a coefficient to be determined;
4b) plotting by OriginPro software according to the functional expression of the relative luminous flux R (t), the time t corresponding to the oscillation period1And t2Calculating the flicker frequency f to be 1/(t)2-t1)；
4c) Finding the maximum value R (t) of the relative luminous flux R (t) from the function image of the relative luminous flux R (t)maxWith a minimum value of R (t)minAnd calculating the visual flicker percentage VFP according to the formula (5).
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| CN206637332U (en) * | 2017-02-27 | 2017-11-14 | 南昌大学 | One kind is without the vehement lamp stand lamp of the full spectrum double blank of the low blue light of stroboscopic |
| CN107205297B (en) * | 2017-06-14 | 2019-01-11 | 南昌大学 | A kind of combination LED illumination and the method for heat radiation illumination |
| CN108414083B (en) * | 2018-02-27 | 2019-08-30 | 商洛学院 | One kind can the modified multi-functional illuminance transducer of human eye transmissivity and design method |
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