CN112197939A - Calibration method and calibration system of light source stroboscopic tester based on optical chopping method - Google Patents
Calibration method and calibration system of light source stroboscopic tester based on optical chopping method Download PDFInfo
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Abstract
The invention discloses a calibration method and a calibration system of a light source stroboscopic tester based on an optical chopping method, wherein the method comprises the following steps: setting laser light sources according to different metering requirements; the laser light source is input into the optical chopper through the optical isolator; inputting the stable frequency reference signal into an optical chopper, and changing the continuous optical signal into an optical signal with a specific duty ratio under a certain frequency by using the optical chopper; amplifying the light beam of the optical signal with the duty ratio, and outputting the light beam to a reference detector, wherein the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to a frequency meter; inputting the stable frequency reference signal into a frequency meter, measuring the optical signal by using the frequency meter, and recording the value; replacing a reference detector and a frequency meter with a light source stroboscopic tester to be calibrated; the light source stroboscopic tester to be calibrated is used for directly measuring the light signals, and through debugging, the calibration is completed until the reading value of the light source stroboscopic tester to be calibrated is consistent with the reading value of the frequency meter.
Description
Technical Field
The invention relates to the technical field of light source stroboscopic test, in particular to a calibration method and a calibration system of a light source stroboscopic tester based on an optical chopping method.
Background
The light source stroboscopic tester is used for testing stroboscopic effect of a light source or other lighting equipment, and at present, no metering technical specification of the light source stroboscopic tester exists in China, and no patent of a related automatic calibration system or method exists. For the calibration of a light source stroboscopic tester, instrument manufacturers such as Hangzhou remote photoelectricity and Japan Jingli motors mainly use a method for manually comparing a reference oscilloscope with a tested light source stroboscopic tester at present, and a calibration device of the stroboscopic tester mainly comprises a light source, a photoelectric converter and the reference oscilloscope. As disclosed in chinese patent publication No. CN109799366A, published: 2019.05.24, discloses a light curtain target calibration device based on stroboscopic light source and its calibration method, specifically discloses a light curtain calibration device comprising an initial calibration light curtain structure, a cut-off calibration light curtain structure, a computer, a light source controller and a signal collector, wherein the initial calibration light curtain structure comprises an initial target emission light source mounting rack, an initial target stroboscopic light source and an initial target photoelectric converter; the cut-off calibration light curtain structure comprises a cut-off target emission light source mounting frame, a cut-off target stroboscopic light source and a cut-off target photoelectric converter.
The above prior art mainly has the following disadvantages: high-precision calibration cannot be realized, and the efficiency is not high; the oscilloscope has low frequency measurement precision, and is not beneficial to tracing the flicker frequency of the light source; the used light source is a wide-spectrum light source, and the waveform is widened, the rise time is increased and the flicker index parameter cannot be accurately measured due to different optical response times of the instrument to different wavelength components; the wide-spectrum light source is limited by materials, cannot generate high-frequency stroboscopic signals, and has a limited measuring capacity range.
Disclosure of Invention
The invention provides a calibration method and a calibration system of a light source stroboscopic tester based on a light chopping method, aiming at solving the problems of insufficient precision and low efficiency in the prior art, so that the high-precision metering calibration and tracing of the light source stroboscopic tester are realized, and the calibration efficiency is improved.
In order to achieve the purpose of the invention, the technical scheme is as follows: a calibration method of a light source stroboscopic tester based on an optical chopping method comprises the following steps:
s1: setting laser light sources according to different metering requirements; in order to reduce the disturbance change of the optical power, a laser light source is input into an optical chopper through an optical isolator;
s2: inputting the stable frequency reference signal into an optical chopper, and changing the continuous optical signal into an optical signal with a specific duty ratio under a certain frequency by using the optical chopper;
s3: amplifying the light beam of the optical signal with the duty ratio, increasing the diameter of a light spot and reducing the power density;
s4: the amplified optical signal is output to a reference detector, and the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to a frequency meter; inputting the stable frequency reference signal into a frequency meter, measuring and displaying numerical values of the optical signal by using the frequency meter, and recording the numerical values;
s5: replacing a reference detector and a frequency meter with a light source stroboscopic tester to be calibrated, namely amplifying a stroboscopic signal generated by a light source and outputting the stroboscopic signal to the light source stroboscopic tester to be calibrated;
s6: the light signal is directly measured by using the light source stroboscopic tester to be calibrated, and the calibration is completed by continuously debugging until the reading value of the light source stroboscopic tester to be calibrated is consistent with the reading value of the frequency meter.
The invention is based on the calibration method of the light source stroboscopic tester based on the optical chopping method, and also provides a calibration system of the light source stroboscopic tester based on the optical chopping method, which is characterized in that: the system comprises an atomic frequency standard instrument, a laser, an optical isolator, an optical chopper, a beam expander, a reference detector, a frequency meter and a light source stroboscopic tester to be calibrated;
the atomic frequency standard instrument provides stable frequency reference signals for the optical chopper and the frequency meter respectively;
the laser can be set according to different requirements and is used for generating a laser light source;
the optical isolator is used for reducing light reflected back to the laser and reducing disturbance change of optical power;
the optical chopper is used for converting a continuous optical signal into an optical signal with a specific duty ratio under a certain frequency;
the beam expander is used for amplifying the light beam of the output optical signal, increasing the diameter of a light spot and reducing the power density;
the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to the frequency meter, and the frequency meter performs measurement and numerical value display on the optical signal and records the numerical value;
and replacing the reference detector and the frequency meter by using the light source stroboscopic tester to be calibrated, namely inputting the optical signal output by the beam expander into the light source stroboscopic tester to be calibrated, and adjusting the light source stroboscopic tester to ensure that the display numerical value is consistent with the numerical value displayed by the frequency meter so as to finish calibration.
The invention has the following beneficial effects:
the invention adopts the optical chopping method to change continuous optical signals into optical signals with specific duty ratio under a certain frequency, thereby realizing the measurement of the flicker frequency, the flicker index and the flicker percentage; meanwhile, an ultra-high precision atomic frequency standard instrument is adopted, so that direct tracing from the light source flicker frequency to the frequency standard is realized; the laser is used as a light source, the monochromaticity is good, the accurate measurement of the flicker index parameter is realized, and meanwhile, the response measurement of the light source stroboscopic tester to light sources with different wavelengths can be realized by changing the lasers with different wavelengths.
Drawings
Fig. 1 is a flowchart of a calibration method of a light source strobe tester based on the optical chopping method in embodiment 1.
FIG. 2 is a waveform diagram of an optical signal output in embodiment 1.
FIG. 3 is a partial block diagram of a calibration system of the light source strobe tester with a frequency meter according to embodiment 3.
FIG. 4 is another block diagram of a part of the calibration system of the light source stroboscopic tester with frequency meter in embodiment 3.
FIG. 5 is a partial block diagram of a calibration system of the light source stroboscope with oscilloscope according to embodiment 4.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, a calibration method of a light source strobe tester based on an optical chopping method includes the following steps:
s1: setting laser light sources according to different metering requirements; in order to reduce the disturbance change of the optical power, a laser light source is input into an optical chopper through an optical isolator;
s2: inputting the stable frequency reference signal into an optical chopper, and changing the continuous optical signal into an optical signal with a specific duty ratio under a certain frequency by using the optical chopper;
s3: amplifying the light beam of the optical signal with the duty ratio, increasing the diameter of a light spot and reducing the power density;
s4: the amplified optical signal is output to a reference detector, and the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to a frequency meter; inputting the stable frequency reference signal into a frequency meter, measuring and displaying numerical values of the optical signal by using the frequency meter, and recording the numerical values;
s5: replacing a reference detector and a frequency meter with a light source stroboscopic tester to be calibrated, namely amplifying a stroboscopic signal generated by a light source and outputting the stroboscopic signal to the light source stroboscopic tester to be calibrated;
s6: the light signal is directly measured by using the light source stroboscopic tester to be calibrated, and the calibration is completed by continuously debugging until the reading value of the light source stroboscopic tester to be calibrated is consistent with the reading value of the frequency meter.
The laser light source can be arranged according to different metering requirements to generate laser with different wavelengths; in order to reduce the disturbance change of the light power, an optical isolator is arranged at the output end of the laser light source to reduce the reflection of the light source; the continuous light signal is changed into the light signal with a specific duty ratio under a certain frequency by using the optical chopper, so that the measurement of the flicker frequency, the flicker index and the flicker percentage is realized. In the embodiment, the atomic frequency standard instrument is adopted to improve the testing precision, and the tracing chain of the light source flicker frequency and the atomic frequency standard is established; the accurate measurement of the flicker index can be realized by utilizing the characteristics of good monochromaticity and small signal rise time of the laser light source.
In a specific embodiment, the photointerrupter changes a continuous light signal into a light signal with a specific duty ratio under a certain frequency, so as to realize the measurement of parameters such as a flicker frequency, a flicker index and a flicker percentage.
In a specific embodiment, as shown in fig. 2, the calculation formula of the flicker index is as follows:
in the formula, S1 represents the waveform area of the portion above the average value in one cycle, and S2 represents the waveform area of the portion below the average value in one cycle.
In a specific embodiment, as shown in fig. 2, the calculation formula of the flicker percentage is as follows:
y by custom waveformmax、yminAnd calculating the value, and outputting light signals with different modulation depth values.
Example 2
The present embodiment provides another calibration method for a light source strobe tester based on an optical chopping method, which is only different from the calibration method described in embodiment 1, in that the present embodiment uses an oscilloscope instead of the frequency meter described in embodiment 1, that is, the present embodiment uses the oscilloscope to measure and display an optical signal. The oscilloscope can observe various waveform curves of different signal amplitudes along with time change, and can measure signals such as frequency, phase difference, amplitude modulation and the like of optical signals with duty ratios.
Example 3
Based on the calibration method described in embodiment 1, this embodiment provides a calibration system of a light source stroboscopic tester based on an optical chopping method, as shown in fig. 3 and 4, the system includes an atomic frequency standard, a laser, an optical isolator, an optical chopper, a beam expander, a reference detector, a frequency meter, and a light source stroboscopic tester to be calibrated;
the atomic frequency standard instrument provides stable frequency reference signals for the optical chopper and the frequency meter respectively, so that the measurement precision is improved;
the laser can be set according to different requirements and is used for generating laser meeting different requirements;
the optical isolator is used for reducing the light output by the laser to be reflected back to the laser, protecting the laser, reducing the disturbance influence of optical signals on a calibration result and reducing the disturbance change of optical power;
the optical chopper is used for converting a continuous optical signal into an optical signal with a specific duty ratio under a certain frequency;
the beam expander is used for amplifying the light beam of the output optical signal, increasing the diameter of a light spot and reducing the power density;
the reference detector is used for performing photoelectric conversion on the optical signal output by the beam expander and outputting the optical signal to the frequency meter, and the frequency meter is used for measuring the optical signal, displaying a numerical value and recording the numerical value; the frequency bandwidth of the reference detector is greater than the frequency bandwidth of the output optical signal.
And replacing the reference detector and the frequency meter by using the light source stroboscopic tester to be calibrated, namely inputting the optical signal output by the beam expander into the light source stroboscopic tester to be calibrated, and adjusting the light source stroboscopic tester to ensure that the display numerical value is consistent with the numerical value displayed by the frequency meter so as to finish calibration.
The frequency meter of the embodiment is used for receiving the output signal of the reference detector and performing waveform analysis, and has an external reference signal input function.
In a specific embodiment, the calibration system further comprises an intelligent terminal, and the intelligent terminal is electrically connected with the laser, the atomic frequency standard instrument, the frequency meter and the light source stroboscopic tester with the program control interface through several communication interfaces of a USB, a LAN and a GPIB to realize data acquisition and parameter calibration. The intelligent terminal comprises a tablet computer and a desktop computer. The intelligent terminal controls and automatically calibrates and tests the laser, the atomic frequency standard instrument, the frequency meter and the optical chopper, and performs data acquisition and analysis to obtain a calibration result.
Example 4
Based on the calibration method described in embodiment 2, this embodiment provides a calibration system of a light source strobe tester based on a light chopping method, and as shown in fig. 5, the system includes an atomic frequency standard, a laser, an optical isolator, an optical chopper, a beam expander, a reference detector, an oscilloscope, and a light source strobe tester to be calibrated;
the atomic frequency standard instrument provides stable frequency reference signals for the optical chopper and the frequency meter respectively, so that the measurement precision is improved;
the laser can be set according to different requirements and is used for generating a laser light source;
the optical isolator is used for reducing the light output by the laser to be reflected back to the laser, protecting the laser, reducing the disturbance influence of optical signals on a calibration result and reducing the disturbance change of optical power;
the optical chopper is used for converting a continuous optical signal into an optical signal with a specific duty ratio under a certain frequency;
the beam expander is used for amplifying the light beam of the output optical signal, increasing the diameter of a light spot and reducing the power density;
the reference detector is used for performing photoelectric conversion on the optical signal output by the beam expander and outputting the optical signal to the oscilloscope, and the oscilloscope performs measurement and numerical value display on the optical signal and records the numerical value; the frequency bandwidth of the reference detector is greater than the frequency bandwidth of the output optical signal.
And replacing the reference detector and the oscilloscope by using the light source stroboscopic tester to be calibrated, namely inputting the optical signal output by the beam expander into the light source stroboscopic tester to be calibrated, and adjusting the light source stroboscopic tester to enable the display numerical value to be consistent with the numerical value displayed by the oscilloscope, thereby completing calibration.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A calibration method of a light source stroboscopic tester based on an optical chopping method is characterized in that: the calibration method comprises the following steps:
s1: setting laser light sources according to different metering requirements; in order to reduce the disturbance change of the optical power, a laser light source is input into an optical chopper through an optical isolator;
s2: inputting the stable frequency reference signal into an optical chopper, and changing the continuous optical signal into an optical signal with a specific duty ratio under a certain frequency by using the optical chopper;
s3: amplifying the light beam of the optical signal with the duty ratio, increasing the diameter of a light spot and reducing the power density;
s4: the amplified optical signal is output to a reference detector, and the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to a frequency meter; inputting the stable frequency reference signal into a frequency meter, measuring and displaying numerical values of the optical signal by using the frequency meter, and recording the numerical values;
s5: replacing a reference detector and a frequency meter with a light source stroboscopic tester to be calibrated, namely amplifying a stroboscopic signal generated by a light source and outputting the stroboscopic signal to the light source stroboscopic tester to be calibrated;
s6: the light signal is directly measured by using the light source stroboscopic tester to be calibrated, and the calibration is completed by continuously debugging until the reading value of the light source stroboscopic tester to be calibrated is consistent with the reading value of the frequency meter.
2. The method for calibrating the light source stroboscopic tester based on the optical chopping method according to claim 1, characterized in that: the frequency meter can be replaced by an oscilloscope.
3. The method for calibrating the light source stroboscopic tester based on the optical chopping method according to any one of claims 1 or 2, characterized in that: the photointerrupter changes continuous optical signals into optical signals with specific duty ratio under a certain frequency, and the measurement of parameters such as flicker frequency, flicker index and flicker percentage is realized.
4. The method for calibrating the light source stroboscopic tester based on the optical chopping method according to claim 3, characterized in that: the calculation formula of the flicker index is as follows:
in the formula, S1 represents the waveform area of the portion above the average value in one cycle, and S2 represents the waveform area of the portion below the average value in one cycle.
5. The method for calibrating the light source stroboscopic tester based on the optical chopping method according to claim 4, characterized in that: the calculation formula of the flicker percentage is as follows:
y by custom waveformmax、yminAnd calculating the value, and outputting light signals with different modulation depth values.
6. A calibration system based on the calibration method of the light source stroboscopic tester based on the optical chopping method of any one of claims 1, 2, 4 and 5, wherein: the system comprises an atomic frequency standard instrument, a laser, an optical isolator, an optical chopper, a beam expander, a reference detector, a frequency meter and a light source stroboscopic tester to be calibrated;
the atomic frequency standard instrument provides stable frequency reference signals for the optical chopper and the frequency meter respectively;
the laser can be set according to different requirements and is used for generating a laser light source;
the optical isolator is used for reducing light reflected back to the laser and reducing disturbance change of optical power;
the optical chopper is used for converting a continuous optical signal into an optical signal with a specific duty ratio under a certain frequency;
the beam expander is used for amplifying the light beam of the output optical signal, increasing the diameter of a light spot and reducing the power density;
the reference detector performs photoelectric conversion on the received optical signal and outputs the optical signal to the frequency meter, and the frequency meter performs measurement and numerical value display on the optical signal and records the numerical value;
and replacing the reference detector and the frequency meter by using the light source stroboscopic tester to be calibrated, namely inputting the optical signal output by the beam expander into the light source stroboscopic tester to be calibrated, and adjusting the light source stroboscopic tester to ensure that the display numerical value is consistent with the numerical value displayed by the frequency meter so as to finish calibration.
7. The light chopping method-based calibration system for the light source stroboscopic tester according to claim 6, characterized in that: the frequency bandwidth of the reference detector is greater than the frequency bandwidth of the output optical signal.
8. The light chopping method-based calibration system for the light source stroboscopic tester according to claim 7, characterized in that: the calibration system further comprises an intelligent terminal, and the intelligent terminal is electrically connected with the laser, the atomic frequency standard instrument, the frequency meter, the optical chopper and the light source stroboscopic tester with the program control interface through the communication interface respectively to achieve data acquisition and parameter calibration.
9. The method for calibrating the light source stroboscopic tester based on the optical chopping method according to claim 8, characterized in that: the communication interface comprises USB, LAN and GPIB.
10. The calibration system of the light source stroboscopic tester based on the optical chopping method according to any one of claims 6 to 9, characterized in that: the frequency meter can be replaced by an oscilloscope.
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Cited By (1)
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| CN117723268A (en) * | 2023-11-21 | 2024-03-19 | 同济大学 | Laser jitter calibration measurement device and method based on optical chopper |
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