System and method for measuring spectral luminous efficiency by adopting wide-spectrum LED light source

Abstract

The invention discloses a system and a method for measuring spectral luminous efficiency by adopting a wide-spectrum LED light source. Comprising a DC power supply, a square wave signal generator electrically connected to the DC power supply and used for generating a 25 Hz square wave signal; the NOT gate is connected with the square-wave signal generator and generates an inversion signal, the MOS tube A is connected with the square-wave signal generator, and the output end of the MOS tube A is connected with the resistance box A; the MOS tube B is connected to the NOT gate and the output end of the MOS tube B is connected with the resistance box B; the reference light source is connected with the resistance box A; the to-be-measured light source is connected with the resistance box B; the constant-voltage power supply is connected with the MOS tube A and the MOS tube B and supplies power to the MOS tube A and the MOS tube B; a reflecting layer is arranged on the inner wall of the integrating sphere, a light source hole, an observation hole, a measuring hole and a built-in baffle plate are further arranged, and a reflecting layer is coated on the surface of the baffle plate; the light source to be measured comprises an equal LED single light source and a combined light source of a plurality of LEDs. Absolute spectral distribution of different LEDs under equal brightness is obtained through measurement, spectral luminous efficiency is described by adopting three Gaussian functions, and an undetermined coefficient is obtained through fitting.

Description

Technical Field

[0001] The present invention relates to the technical field of ophthalmology and optic nerve measurement, and in particular to a system and method for measuring spectral luminous efficiency by using a wide-spectrum LED light source. Background Art

[0002] The spectral luminous efficiency function (V(λ)) is a physiological physical quantity that describes the effect of light of different wavelengths on the human eye. V(λ) is generally used to describe this sensitivity. In 1931, the International Commission on Illumination (CIE) unified V(λ). Subsequently, people have continuously revised V(λ) through experiments.

[0003] Practice shows that the V(λ) recommended by CIE1931 performs poorly in terms of high color temperature LED luminosity. As a standard, this V(λ) curve refers to a large amount of luminosity data from a wide range of sources and a variety of experimental methods. The data obtained from various research results are averaged, and this curve greatly underestimates the spectral sensitivity of short waves. Therefore, it is necessary to re-measure V(λ).

[0004] At present, the common methods for determining V(λ) include the step-by-step comparison method, the direct visual brightness matching method, and the flicker method. These three methods are introduced in detail in photometry and colorimetry books, domestic and foreign photometry standards, and related literature (Pulse Photometry, 2019 Chemical Industry Press, Liu Muqing et al.; Photometry, 2010 China Metrology Press, Hao Yunxiang, Chen Xiaju, Zhang Baozhou; 2011 Radiometric Photometry and Colorimetry and Its Measurement, Beijing Institute of Technology Press, Jin Weiqi, Hu Weijie).

[0005] This research group has proposed a method that uses an integrating sphere and a digital circuit to obtain accurate V(λ) through extrapolation and direct measurement (patent name: A system and method for accurately measuring V(λ), patent number 202011439257.7). However, all currently disclosed methods, including this method, require the use of a single-wavelength light source. In fact, the current monochromatic LED light source has a spectral half-width of 10 to 30 nm, which cannot meet the requirements of a single wavelength and is still a broadband light source. The laser source can be regarded as a single-wavelength light source, but the types of laser wavelengths in the visible light range are limited, making it difficult to complete the V(λ) test experiment.

[0006] When using a broadband light source to measure V(λ), the light source is generally equivalent to a single-wavelength light source with a peak wavelength, which introduces errors and makes it difficult to accurately measure V(λ). Summary of the invention

[0007] The purpose of the present invention is to design a system and method for accurately measuring V(λ) using a broadband LED light source, in view of the problem that the corresponding characteristic wavelength cannot be accurately obtained when measuring V(λ) using an existing broadband light source, thereby greatly improving the measurement accuracy of the spectral luminous efficiency function of the human eye.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention designs a system for measuring the spectral luminous efficiency of human eyes using a broadband LED light source, and the system comprises:

[0010] A DC power supply, used to power the square wave signal generator;

[0011] A square wave signal generator, which is electrically connected to the DC power supply and is used to alternately output a light emitting signal 0 / 1; wherein the signal frequency is 25 Hz and the 0 / 1 signal duty cycle is 50%;

[0012] A NOT gate, used for receiving the luminous signal 0 or the luminous signal 1 output by the square wave signal generator;

[0013] MOS tube A, which is connected to the square wave signal generator, and the output end is connected to the resistor box A;

[0014] MOS tube B, which is connected to the NOT gate and has an output end connected to a resistor box B;

[0015] A reference light source, which is electrically connected to the output end of the resistor box A and the luminous intensity is controlled by it;

[0016] The light source to be tested is electrically connected to the output end of the resistor box B and the luminous intensity is controlled by it;

[0017] A constant current power supply is electrically connected to the MOS tube A and the MOS tube B, and controls the constant voltage power supply through the MOS tube A and the MOS tube B to supply power to the reference light source and the light source to be measured respectively;

[0018] and an integrating sphere, the inner wall of which is provided with a reflecting layer, and the light source hole, an observation hole and a measuring hole are also provided thereon, and the reference light source and the light source to be measured are arranged in the light source hole;

[0019] Wherein, the light source to be tested includes a single LED light source and a mixed light source of multiple LEDs;

[0020] Among them, when the luminous signal provided by the PWM signal generator is 1, the MOS tube A is triggered to drive the reference light source to emit light; when the luminous signal provided by the square wave signal generator is 0, the MOS tube B is triggered by the NOT gate to drive the light source to be tested to emit light.

[0021] Specifically, the connection mode of the system designed by the present invention for accurately measuring the spectral light efficiency function of the human eye is as follows: a DC power supply supplies power to a square wave signal generator, and the square wave signal generator outputs a square wave pulse, whose frequency and duty cycle are adjustable, and whose function is to provide an alternating light emitting signal 0 / 1, that is, when the signal is 1, MOS tube A is triggered to drive the reference light source to emit light, and when the signal is 0, MOS tube B is triggered through a NOT gate to drive the light source to be measured to emit light. MOS tube A and MOS tube B control a constant voltage power supply to supply power to the reference light source and the light source to be measured. MOS tube A and MOS tube B are connected to a resistor box A and a resistor box B, respectively, and the output ends of the resistor box A and the resistor box B are connected to the reference light source and the light source to be measured, respectively; by adjusting the resistor boxes A and B, the light output (luminous intensity) of the reference light source and the light source to be measured can be adjusted.

[0022] Specifically, in the measurement system designed in the present invention, both the reference light source and the light source to be measured use LEDs as light sources.

[0023] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: the integrating sphere is a steel sphere with a diameter of 25 to 50 centimeters.

[0024] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: the reflectivity of the reflective layer to all wavelengths of light within the range of 380 to 780 nm is higher than 95%.

[0025] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye is provided: the light source hole and the observation hole are arranged to be in the same straight line with the center of the integrating sphere, and the measuring hole is arranged close to the observation hole.

[0026] Furthermore, a system for accurately measuring the spectral light efficiency function of the human eye: a light shield is also provided in front of the observation hole to block the direct light emitted by the light source from the observer, so that the light observed by the observer is uniform and fully reflected by the inner wall of the integrating sphere. Specifically, the light shield is set to be circular and is set at about 1 / 5 of the diameter in front of the observation hole.

[0027] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye is provided: the reference light source and the light source to be measured are arranged closely together but do not touch each other, and do not touch the inner wall of the integrating sphere.

[0028] The present invention also provides a method for accurately measuring the spectral luminous efficiency of human eyes, the method comprising the following specific steps:

[0029] S1, using the DC power supply to power the square wave signal generator, so that it alternately outputs a 25Hz pulse square wave signal, that is, a light emitting signal 0 / 1;

[0030] S2, when the square wave signal generator output is 1, the MOS tube A is triggered to drive the reference light source to emit light, and when the square wave signal generator output is 0, the MOS tube B is triggered through the NOT gate to drive the light source to be tested to emit light, so that the light emitted by the reference light source and the light source to be tested flashes alternately;

[0031] S4, the observer observes the light in the integrating sphere from the observation hole, and changes the luminous intensity of the light source to be measured by adjusting the resistor box B. When the luminous intensity of the light source to be measured is adjusted to a certain value, the flickering feeling of the light to be measured and the reference light felt by the observer reaches a minimum or disappears. At this time, it is considered that the luminous intensities of the reference light source and the light source to be measured are equal and balanced.

[0032] S5. Through the measuring hole, measure the spectral radiation flux Φ at the integrating sphere test hole when the light source to be tested and the reference light source emit light separately. e (λ);

[0033] S6. Use different spectra of the light source to be measured to obtain the spectral radiation flux Φ corresponding to the different light sources to be measured. e (λ). The light source to be measured has no less than 9 spectral distributions, and the corresponding spectral radiation flux is Φ e n (λ),(n=1,2,3...)

[0034] The measuring principle of the system and method for measuring the spectral luminous efficiency function of human eyes provided by the present invention is: the spectral luminous efficiency function is described by three Gaussian functions, which is expressed as formula (1):

[0035]

[0036] In the formula, c1, c2, c3, λ1, λ2, λ3, Δλ1, Δλ2, Δλ3 are 9 unknown coefficients. Then we have:

[0037]

[0038] S7. According to equation group (2), as long as there are at least 8 light sources to be measured, the optimal values ​​of the 9 unknown coefficients can be obtained, and then the spectral luminous efficiency function V(λ) can be obtained. In the formula, λ1 is between 465 and 470nm, λ2 is between 495 and 510nm, λ3 is between 625 and 640nm, Δλ1 is between 22 and 28nm, Δλ2 is between 36 and 47nm, and Δλ3 is between 23 and 28nm.

[0039] The flicker method is a method for judging the equality of photometric quantities. In the same field of view, the reference light and the light to be measured are rapidly and alternately irradiated into the field of view at a specific frequency, and the driving current of the light source to be measured is adjusted until the observer feels that the flicker has been eliminated (or minimized). The reference light and the light to be measured are considered to have the same visual luminous intensity. The basic principle of this method is that when the interaction frequency between the light source to be measured and the reference light source in the visual area is greater than its critical flicker threshold, humans can only feel the flicker of brightness, but not the flicker of color. From the basic theory of the flicker method, it can be seen that this measurement method only includes the influence of non-chromatic channels. In the process of measuring the spectral luminous efficiency function, the discreteness of the flicker method is low, and only the non-chromatic channels have an impact, so that the spectral luminous efficiency function measured by this method conforms to the brightness additivity.

[0040] The invention has the following beneficial effects: the invention creatively adopts a wide spectrum light source as the light source to be tested and the reference light source, reduces the phenomenon that the monochromatic light source stimulates different visual channels, and causes the phenomenon that flicker elimination cannot be observed. The invention creatively solves the problem that it is difficult to determine the wavelength λ corresponding to the V(λ) measured by the LED to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic diagram of the structure of a system designed for the present invention that uses a wide-spectrum LED light source to accurately measure spectral luminous efficiency;

[0043] Figure 2 This is the output effect diagram of the square wave generator, MOS tube A and MOS tube B;

[0044] Figure 3 Spectral distribution diagram of the light source to be tested and the reference light source in Example 1;

[0045] Figure 4 is the normalized spectral distribution diagram of the reference light source;

[0046] Figure 5 This is the V(λ) result obtained in Example 1.

[0047] Markings in the figure: 1-DC power supply, 2-square wave signal generator, 3-NOT gate, 4-MOS tube A, 5-MOS tube B, 6-constant voltage power supply, 7-resistance box A, 8-resistance box B, 9-light source hole, 10-reference light source constant current power supply, 11-light source to be measured, 12-integrating sphere, 13-observation hole, 14-measuring hole, 15-light shield, 16-square wave generator, 17-MOS tube A, 18-MOS tube B. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the position or positional relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0050] Example 1

[0051] like Figure 2 As shown, in this embodiment 1, a system for accurately measuring the spectral luminous efficiency function of the human eye is designed, and the system includes:

[0052] A DC power supply 1 (model: MEANWELL RS-15-15), used for supplying power to the square wave signal generator 2;

[0053] A square wave signal generator 2 (model: XY-LPWM) is electrically connected to the DC power supply 1 and is used to alternately output a light emitting signal 0 / 1; wherein the signal frequency is 25 Hz, and the 0 / 1 signal duty cycle is 50%.

[0054] NOT gate 3 (model: 74LS00), which is used to receive the luminous signal 0 or the luminous signal 1 output by the square wave signal generator 2;

[0055] MOS tube A 4 (model: P75NF75), which is connected to the square wave signal generator 2 and the output end of which is connected to the resistor box A 7;

[0056] MOS tube B5 (model: P75NF75), which is connected to the NOT gate 3 and has an output end connected to a resistor box B8;

[0057] A reference light source 10 (produced by Nichia), which is electrically connected to the output end of the resistor box A7 and the luminous intensity is controlled by it;

[0058] The light source to be tested 11 (produced by Nichia) is electrically connected to the output end of the resistor box B 8 and the luminous intensity is controlled by it;

[0059] A constant voltage power supply 6 (produced by Zhengdian Electronics, model: DP100), electrically connected to the MOS tube A 4 and the MOS tube B 5, and the constant voltage power supply 6 is controlled by the MOS tube A 4 and the MOS tube B 5 to supply power to the reference light source 10 and the light source to be measured 11 respectively;

[0060] and an integrating sphere 12 (produced by Yuanfang Company, model: IP2022), the inner wall of which is provided with a reflective layer, and a light source hole 9, an observation hole 13 and a measuring hole 14 are also provided thereon, the reference light source 10 and the light source to be measured 11 are arranged in the light source hole 9, and the reference light source 10 and the light source to be measured 11 are inside the integrating sphere 12, so that the two light sources are close to but not in contact with the inner wall of the integrating sphere 12;

[0061] Among them, Figure 2 As shown, when the luminous signal provided by the PWM signal generator 2 is 1, the MOS tube A 4 is triggered to drive the reference light source 10 to emit light. When the luminous signal provided by the square wave signal generator 2 is 0, the MOS tube B 5 is triggered by the NOT gate 3 to drive the light source 11 to be tested to emit light;

[0062] Specifically, in the system for accurately measuring the spectral luminous efficiency function of the human eye designed in the above embodiment, the integrating sphere 12 is set as a three-hole steel spherical structure, the inner wall of which is sprayed with a barium sulfate reflection layer, and the reflectivity of the light with a wavelength of 380-780nm is higher than 95%; the diameter of the integrating sphere 12 is set to 50cm, the center of the light source hole 9 and the observation hole 13 is set to be in the same straight line with the center of the integrating sphere 12, the aperture is set to 5cm, and a circular light baffle 15 with a diameter of about 20cm is also set 10cm in front of the observation hole 13 (the center of the baffle 15 is located between the center of the observation hole 13 and the center of the integrating sphere 12), and its function is to block the direct light source part of the reference light source 10 and the light source to be measured 11 for the human eye, so that the light observed by the observer is uniform and fully reflected by the inner wall of the integrating sphere 12; the measuring holes are set around the observation hole 13, the purpose of which is to place a light radiometer through the observation hole 14 to measure the spectral radiation flux Φ of the reference light source 10 and the light source to be measured 11 e (λ).

[0063] Specifically, in the system for accurately measuring the spectral luminous efficiency function of the human eye designed in the above embodiment, the circuit connections of each functional module are as follows:

[0064] Square wave signal generator 2, its DC+ interface is connected to the positive pole of DC power supply 1, GND interface is connected to the negative pole of DC power supply 1, the interface is divided into two paths, one is connected to MOS tube A, and the other is connected to input pin A2 of NOT gate 3;

[0065] NOT gate 3, its A1 pin is connected to the positive electrode, A2 pin is connected to the square wave signal generator, Vcc pin is connected to the positive electrode of DC power supply 1; GND pin is connected to the negative electrode of DC power supply 1;

[0066] MOS tube A4, pulse trigger module, input: IN+ interface connected to square wave signal generator 2; output OUT+ interface connected to the positive pole of resistor box A7, OUT- interface connected to the negative pole of reference light source 10;

[0067] MOS tube B5, pulse trigger module, input: IN+ interface connected to the output pin Y1 of NOT gate 3; output: OUT+ interface connected to the positive pole of resistor box B8; OUT- interface connected to the negative pole of the light source 11 to be tested;

[0068] Resistor box A7, the positive electrode of resistor box A5 is connected to the OUT+ interface of MOS tube A4, and the negative electrode of resistor box A5 is connected to the positive electrode of reference light source 10;

[0069] A resistor box B 8, wherein the positive electrode of the resistor box B 8 is connected to the OUT+ interface of the MOS tube B 5, and the negative electrode of the resistor box B 8 is connected to the negative electrode of the light source 11 to be tested;

[0070] Reference light source 10, with its positive electrode connected to the OUT+ interface of MOS tube A 4, and its negative electrode connected to the negative electrode of resistor box A 7;

[0071] The light source to be tested 11 has its positive electrode connected to the OUT+ interface of the MOS tube B5, and its negative electrode connected to the negative electrode of the resistance box B8.

[0072] Example 2

[0073] This embodiment 2 provides a method for accurately measuring the spectral luminous efficiency function of the human eye. The method uses the system designed in the above embodiment 1 for measurement. The method includes the following specific steps:

[0074] S1, using the DC power supply (1) to power the square wave signal generator (2), so that it alternately outputs a 25-30 Hz pulse square wave signal, i.e., a light emitting signal 0 / 1;

[0075] S2, when the square wave signal generator (2) outputs 1, the MOS tube A (4) is triggered to drive the reference light source (9) to emit light, and when the square wave signal generator (2) outputs 0, the MOS tube B (5) is triggered through the NOT gate (3) to drive the light source (11) to emit light, so that the light emitted by the reference light source (10) and the light source (11) to be measured flashes alternately;

[0076] S4, the observer observes the light in the integrating sphere (12) from the observation hole (13), and changes the luminous intensity of the light source (11) to be measured by adjusting the resistance box B (8). When the luminous intensity of the light source (11) to be measured is adjusted to a certain value, the flickering sensation of the light source (11) to be measured and the reference light (10) felt by the observer reaches a minimum or disappears. At this time, it is considered that the luminous intensities of the reference light source (10) and the light source (11) to be measured are equal and balanced.

[0077] S5. Through the measuring hole, respectively measure the spectral radiation flux Φ at the testing hole (14) of the integrating sphere (12) when the light source to be tested (11) and the reference light source (10) emit light independently. e (λ);

[0078] S6. Use a different spectrum of the light source to be measured (11) to obtain the spectral radiation flux Φ corresponding to the different light sources to be measured. e (λ). The light source (11) to be measured has no less than 9 spectral distributions, and the corresponding spectral radiation flux is Φ e n (λ),(n=1,2,3...)

[0079] 7. The method for accurately measuring the spectral luminous efficiency function of human eyes using a wide-spectrum LED light source according to claim 1 is characterized in that the spectral luminous efficiency function is described by three Gaussian functions, expressed as:

[0080]

[0081] In the formula, c1, c2, c3, λ1, λ2, λ3, Δλ1, Δλ2, Δλ3 are 9 unknown coefficients. Then we have:

[0082]

[0083] According to equation group (2), as long as there are at least 9 light sources (11) to be measured, the optimal values ​​of the 9 unknown coefficients can be obtained, and then the spectral luminous efficiency function V(λ) can be obtained.

[0084] Note: Since the light source to be tested 11 and the reference light source 10 emit light alternately, if they are equally bright, the human eye cannot perceive the change in brightness and there is no flicker (i.e. the luminous intensity is equal and reaches a balance) between "the light source to be tested 11 is on and the reference light source 10 is off" and "the light source to be tested 11 is off and the reference light source 10 is on".

[0085] Specifically, in the above embodiment 2, the spectrum of the reference light source 10 is measured and set. Figure 4 The spectral radiation flux on the inner wall of the integrating sphere is 0.84W / (m 2 Sr), respectively Figure 3 The light sources with 11 spectral distributions are the light sources 11 to be tested. When the observer observes that the brightness of the light source 11 to be tested is equal to that of the reference light source 10, the spectral radiation flux at the measuring hole of the integrating sphere when the light source 10 to be tested is on are 4.2, 3.1, 2.4, 2.2, 1.56, 0.77, 0.62, 0.67, 0.86, 0.91, 1.2, and 1.4 W / (m 2 Sr), recorded as Φ1-Φ 10 According to the spectral radiation flux and the normalized spectral distribution, the spectral distribution F(λ) can be obtained. Substituting the result into the equation

[0086] V(555)=1;

[0087] Φ n (λ)F n (λ) = constant, (n = 1, 2, 3...)

[0088] Since there are more equations than unknowns, solve the system of equations and get the optimal solution:

[0089] c1=0.1054; λ1=543.6; Δλ1=23.77; C2=0.9324; λ2=562.7; Δλ2=59.92;

[0090] C3=0.1137; λ3=523.5; Δλ3=16.14;

[0091] The corresponding V(λ) curve is shown in Figure 5 .

[0092] The present invention is convenient to test, and its core steps are not significantly different from the existing "flickering method". The testing method of the present invention has low requirements on light sources and is convenient to promote and use. Furthermore, the method of the present invention can use a wide-spectrum LED light source, and its test results are more accurate.

[0093] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A system for measuring spectral luminous efficiency using a wide spectrum LED light source, characterized in that: The system includes: A direct current power supply (1), used to supply power to a square wave signal generator (2); A square wave signal generator (2), which is electrically connected to the DC power supply (1) and is used to output a 25 Hz square wave luminous signal 0 / 1; A NOT gate (3), which is used to receive the luminous signal 0 or the luminous signal 1 output by the square wave signal generator (2); MOS tube A (4), which is connected to the square wave signal generator (2), and the output end of which is connected to the resistor box A (7); MOS tube B (5), which is connected to the NOT gate (3) and has an output end connected to a resistor box B (8); A reference light source (10), which is electrically connected to the output end of the resistor box A (7) and has its luminous intensity controlled thereby; A light source to be tested (11), which is electrically connected to the output end of the resistor box B (8) and has its luminous intensity controlled by the output end; A constant current power supply (6), which controls the constant current power supply (6) through the MOS tube A (4) and the MOS tube B (5) to respectively supply power to the reference light source (10) and the light source to be measured (11); and an integrating sphere (12), the inner wall of which is provided with a reflective layer, and on which is also provided a light source hole (9), an observation hole (13) and a measurement hole (14), wherein the reference light source (10) and the light source to be measured (11) are arranged in the light source hole (9); When the light-emitting signal provided by the square wave signal generator (2) is 1, the MOS tube A (4) is triggered to drive the reference light source (10) to emit light; when the light-emitting signal provided by the square wave signal generator (2) is 0, the MOS tube B (5) is triggered through the NOT gate (3) to drive the light source (11) to be tested to emit light.

2. A system for accurately measuring the spectral luminous efficiency function of human eyes according to claim 1, characterized in that: The integrating sphere (12) is a steel sphere with a diameter of 25 to 50 cm and a sphericity greater than 0.

99.

3. A system for accurately measuring the spectral luminous efficiency function of human eyes according to claim 1 or 2, characterized in that: The reflectivity of the reflective layer to all light wavelengths within the range of 380-780 nm is higher than 95%.

4. A system for accurately measuring the spectral luminous efficiency function of human eyes according to claim 2, characterized in that: The light source hole (9) and the observation hole (13) are arranged to be in the same straight line as the center of the integrating sphere (11), and the measurement hole is arranged close to the observation hole (13).

5. A system for accurately measuring the spectral luminous efficiency function of human eyes according to claim 4, characterized in that: A light blocking plate (15) is also provided in front of the observation hole (13) to block the direct radiation of light emitted by the light source to the observer.

6. A method for accurately measuring the spectral luminous efficiency function of the human eye, characterized in that: The steps include: S1, using the DC power supply (1) to power the square wave signal generator (2), so that it alternately outputs a 25-30 Hz pulse square wave signal, i.e., a light emitting signal 0 / 1; S2, when the square wave signal generator (2) outputs 1, the MOS tube A (4) is triggered to drive the reference light source (9) to emit light, and when the square wave signal generator (2) outputs 0, the MOS tube B (5) is triggered through the NOT gate (3) to drive the light source (11) to emit light, so that the light emitted by the reference light source (10) and the light source (11) to be measured flashes alternately; S4, the observer observes the light in the integrating sphere (12) from the observation hole (13), and changes the luminous intensity of the light source (11) to be measured by adjusting the resistance box B (8). When the luminous intensity of the light source (11) to be measured is adjusted to a certain value, the flickering sensation of the light source (11) to be measured and the reference light (10) felt by the observer reaches a minimum or disappears. At this time, it is considered that the luminous intensities of the reference light source (10) and the light source (11) to be measured are equal and balanced. S5. Through the measuring hole, respectively measure the spectral radiation flux Φ at the testing hole (14) of the integrating sphere (12) when the light source to be tested (11) and the reference light source (10) emit light independently. e (λ); S6. Use a different spectrum of the light source to be measured (11) to obtain the spectral radiation distribution Φ corresponding to the different light sources to be measured e (λ). The light source (11) to be measured has no less than 9 spectral distributions, and the corresponding spectral radiation flux is Φ e n (λ),(n=1,2,3...).

7. The method for accurately measuring the spectral luminous efficiency function of human eyes using a wide spectrum LED light source according to claim 1, characterized in that: The spectral luminous efficiency function is described by three Gaussian functions, expressed as: In the formula, c1, c2, c3, λ1, λ2, λ3, Δλ1, Δλ2, Δλ3 are 9 unknown coefficients. Then we have: According to equation group (E2), as long as there are no less than 9 light sources (11) to be measured, the optimal values ​​of the 9 unknown coefficients can be obtained, and then the spectral luminous efficiency function V(λ) can be obtained.

8. The method for accurately measuring the spectral luminous efficiency function of human eyes according to claim 7, characterized in that: The size of λ1 is between 465 and 470 nm, the size of λ2 is between 495 and 510 nm, the size of λ3 is between 625 and 640 nm, the size of Δλ1 is between 22 and 28 nm, the size of Δλ2 is between 36 and 47 nm, and the size of Δλ3 is between 23 and 28 nm.

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