System and method for accurately measuring spectral luminous efficiency function of human eyes

Abstract

The invention discloses a system and a method for accurately measuring a human eye spectrum luminous efficiency function. Comprising a DC power supply; the PWM signal generator is electrically connected to the direct-current power supply and is used for alternately outputting light-emitting signals 0 / 1; the splitter is used for receiving the light-emitting signal 0 / 1, and when the light-emitting signal 0 is detected, the reference light source emits light; when the light-emitting signal is 1, the light source to be detected emits light; the MOS tube A is connected to the shunt, and the output end of the MOS tube A is connected with the resistance box A; the MOS tube B is connected to the shunt, 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 supplies power to the reference light source and the to-be-measured light source; the inner wall of the integrating sphere is provided with a reflecting layer, a light source hole, an observation hole and a measuring hole; the light source to be measured comprises a monochromatic light source, a white doped light source and a sliding resistor used for regulating and controlling the light emitting proportion of the monochromatic light source and the white doped light source, so that light emitted by the light source to be measured is pure monochromatic light or mixed light doped with monochromatic light and white light.

Description

Technical Field

[0001] The present invention relates to the technical field of optometry and optic nerve measurement, and particularly relates to a system and method for accurately measuring the spectral luminous efficiency function of the human eye. Background Art

[0002] The spectral luminous efficiency function (V(λ)) is a physiological and physical quantity that describes the strength of the effect of light of different wavelengths on the human eye's light sensation. That is, the human eye's sensitivity to light of different wavelengths within the visible range is different, and we generally use the spectral luminous efficiency function V(λ) to describe this sensitivity. In 1931, the International Commission on Illumination (CIE) unified the spectral luminous efficiency function of the human eye for photopic vision. Subsequently, a large number of electric light sources emerged, including gas discharge lamps such as metal halide lamps, sodium lamps, mercury lamps, and fluorescent lamps. Especially in the past two decades, LED lamps have rapidly developed into the mainstream light sources in the lighting and display fields due to their characteristics of environmental friendliness, high luminous efficiency, and small size.

[0003] However, practice has shown that the spectral luminous efficiency function of photopic vision recommended by CIE1931 performs poorly in terms of the luminous intensity of high-color-temperature LEDs. Wyszecki and Stiles made pioneering research on the measurement methods of luminous intensity and chromaticity in their book "Color Science". Regarding this spectral luminous efficiency curve, they wrote: "As a standard, this spectral luminous efficiency curve of photopic vision refers to a large amount of luminous intensity data. These data sources are extensive, and the experimental methods are also diverse. The data obtained from various research results have been averaged. In fact, in the ultraviolet light band, these data differ by up to 10 times, so there are many uncertain factors, and this curve greatly underestimates the spectral sensitivity of short waves."

[0004] Further research shows that the luminous flux of blue LEDs is underestimated by 47%, and the luminous flux of phosphor-converted white LEDs with a high color temperature (6500K) is underestimated by 10%. This leads to more blue light being often designed in lighting and display designs. Without a doubt, this is an important reason for the "LED blue light hazard". At the same time, it is worth noting that there are also differences in the spectral luminous efficiency functions of individual human eyes. For example, children's eyes are significantly more transparent than adults' eyes, and the elderly need more blue light to meet their physiological needs, etc. If the spectral luminous efficiency function of an individual human eye can be accurately measured, and then lighting and display can be designed in a personalized manner, it has a crucial impact on the development of the industry and is also the need of "Healthy China". Therefore, designing a method for accurately measuring the spectral luminous efficiency function of the human eye is of great significance in the lighting and display fields.

[0005] In addition, accurately measuring the spectral luminous efficiency function of the human eye is also of great significance in clinical detection, as follows:

[0006] ①Accurately measuring the spectral luminous efficiency function of an individual's eyes can determine the level of color weakness in the eyes. The eyes with color weakness have lower sensitivity to light of some wavelengths compared to normal eyes.

[0007] ②Accurately measuring the spectral luminous efficiency function of an individual's eyes can also determine the health status of the retinal cells in the eyes. Physiological eye fatigue, dry eye syndrome, and optic nerve inflammation can all cause the light sensitivity of the retinal cells in the eyes to be different from that of normal eyes, often accompanied by symptoms such as decreased vision and abnormal color vision. By comparing the difference in the spectral luminous efficiency functions between an individual's eyes and normal eyes, the retinal health level can be known.

[0008] Currently, the common methods for measuring the spectral luminous efficiency function include the step-by-step comparison method, the direct visual brightness matching method, and the flicker method. These three methods are all introduced in detail in photometric and chromaticity books, domestic and foreign photometric standards, and relevant literature (Pulse Photometry, Chemical Industry Press, 2019, Liu Muqing, etc.). Among them, the flicker method is the most commonly used. The structure of a typical flicker method measurement device is as Figure 1 shown; Figure 1 The light emitted by the reference light source S1 in the figure passes through a light homogenizing sheet and then irradiates on the flicker sheet. The flicker sheet is a semi-circular reflector. The flicker sheet reflects the light of S1 into the collimator L1 and finally enters the observation port for the eyes to observe. When the flicker sheet rotates out of the optical path, the light emitted by the light source S2 passes through a filter to become monochromatic light, passes through a diaphragm and a light homogenizing sheet to obtain a uniform light spot, and then passes through the collimator L2 and the collimator L1 and enters the observation port. In this way, by changing the DC motor to control the flicker sheet, the alternating light sources of S1 and S2 can be seen. By adjusting the light source S2, the luminous intensity of the light source to be measured can be changed until the brightness of the two light sources is the same and the eyes cannot observe the flicker. At this time, measuring the ratio of the illuminance of S1 and S2 at the observation port is inversely proportional to the spectral luminous efficiency.

[0009] However, Figure 1 The flicker method measurement device shown in the figure has the following problems, resulting in difficulty in accurately measuring the spectral luminous efficiency function of the eyes:

[0010] (1) The color purity of the light source is not enough. Although an LED light source can be used to replace the tungsten filament lamp, the LED used has a large power and a large change in the junction temperature, and it is not easy to achieve light stability. If a constant temperature system is used, the adjustment time is long and the test takes a long time, increasing the human error; in addition, the light distribution of the LED varies greatly, making it difficult to eliminate the influence of the light distribution when using the Figure 1 measurement device shown in the figure to measure the spectral luminous efficiency function of the eyes, resulting in poor measurement accuracy;

[0011] (2) When blue light is used as the light to be measured, it is actually difficult to adjust it to the light balance state with reference lights of other colors, resulting in difficulty in judging whether the brightness is equal, that is, it is difficult to adjust to a state where the two light sources do not flicker, and ultimately it will also lead to the problem of difficult to accurately measure the spectral luminous efficiency function of the human eye. Summary of the Invention

[0012] The purpose of the present invention is to design a system for accurately measuring the spectral luminous efficiency function of the human eye and propose a measurement method to solve the problem of inaccurate measurement existing in the existing method of measuring the spectral luminous efficiency function of the human eye by the flicker method, thereby greatly improving the measurement accuracy of the spectral luminous efficiency function of the human eye.

[0013] To achieve the above object, the present invention is realized by the following technical solutions:

[0014] The present invention designs a system for accurately measuring the spectral luminous efficiency function of the human eye, and the system includes:

[0015] A DC power supply for supplying power to the PWM signal generator;

[0016] A PWM signal generator electrically connected to the DC power supply for alternately outputting light emission signals 0 / 1; wherein, the signal frequency is 20 - 30 Hz, and the duty cycle of the 0 / 1 signal is 50%;

[0017] A splitter for receiving the light emission signal 0 or light emission signal 1 output by the PWM signal generator;

[0018] MOS transistor A connected to the splitter, and its output terminal is connected to resistor box A;

[0019] MOS transistor B connected to the splitter, and its output terminal is connected to resistor box B;

[0020] A reference light source electrically connected to the output terminal of resistor box A and controlled by it to control the light emission intensity;

[0021] A light source to be measured electrically connected to the output terminal of resistor box B and controlled by it to control the light emission intensity;

[0022] A constant voltage power supply electrically connected to MOS transistor A and MOS transistor B, and through MOS transistor A and MOS transistor B, controlling the constant voltage power supply to supply power to the reference light source and the light source to be measured respectively;

[0023] And an integrating sphere, the inner wall of which is provided with a reflective layer, and is also provided with a light source hole, an observation hole and a measurement hole, and the reference light source and the light source to be measured are arranged in the light source hole;

[0024] Among them, the light source to be measured includes a monochromatic light source, a white doped light source, and a sliding resistor; the sliding resistor is used to regulate the light emission ratio of the monochromatic light source and the white doped light source, so that the light emitted by the light source to be measured is pure monochromatic light or a mixed light in which monochromatic light and white light are doped in proportion.

[0025] Among them, when the light emission signal provided by the PWM signal generator is 0, the splitter is used to trigger MOS transistor A to drive the reference light source to emit light; when the light emission signal provided by the PWM signal generator is 1, the splitter is used to trigger MOS transistor B to drive the light source to be measured to emit light.

[0026] Specifically, the connection method of the system for accurately measuring the spectral luminous efficiency function of the human eye designed by the present invention is as follows: The DC power supply supplies power to the PWM signal generator, and the PWM signal generator outputs square wave pulses, whose frequency and duty cycle are adjustable, and the function is to provide alternating light emission signals 0 / 1, that is, when the signal is 0, the splitter is used to trigger MOS transistor A to drive the reference light source to emit light, and when the signal is 1, the splitter is used to trigger MOS transistor B to drive the light source to be measured to emit light. MOS transistor A and MOS transistor B control the constant voltage power supply to supply power to the reference light source and the light source to be measured. MOS transistor A and MOS transistor B are respectively connected to resistor box A and resistor box B, and the output ends of resistor box A and resistor box B are respectively connected to the reference light source and the light source to be measured; by adjusting resistor box A and B, the light output (luminous intensity) of the reference light source and the light source to be measured can be adjusted.

[0027] Specifically, in the design of the present invention, both the reference light source and the light source to be measured in this measurement system use LEDs as light sources.

[0028] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: The integrating sphere is a steel sphere, and its inner wall is sprayed with a white reflective layer.

[0029] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: The reflectivity of the reflective layer for each wavelength of light within 380 - 780 nm is higher than 95%.

[0030] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: The light source hole and the observation hole are arranged on the same straight line as the center of the integrating sphere, and the measurement hole is arranged near the observation hole.

[0031] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: A light shield is also arranged in front of the observation hole to block the direct light emitted by the light source from reaching the observer, so that the light observed by the observer is uniform and has been fully reflected by the inner wall of the integrating sphere. Specifically, the light shield is circular and is arranged at about 1 / 5 of the diameter of the integrating sphere in front of the observation hole.

[0032] Furthermore, a system for accurately measuring the spectral luminous efficiency function of the human eye: The reference light source and the light source to be measured are arranged closely, without contacting each other, and without contacting the inner wall of the integrating sphere.

[0033] The present invention also provides a method for accurately measuring the spectral luminous efficiency function of the human eye. This method uses the system designed above for measurement. This method is the "direct measurement method", and it includes the following specific steps:

[0034] S1. Adjust the sliding resistor so that the light emitted by the light source to be measured is pure monochromatic light emitted by the monochromatic light source, and the white doped light source does not emit light;

[0035] S2. Use the DC power supply to supply power to the PWM signal generator so that it alternately outputs pulse square wave signals, that is, light emission signals 0 / 1;

[0036] S3. Through the splitter, decode the received light emission signal. When the truth table output is 0, trigger MOS transistor A to drive the reference light source to emit light. When the truth table output is 1, trigger MOS transistor B to drive the light source to be measured to emit light, so that the light emitted by the reference light source and the light source to be measured flashes alternately;

[0037] S4. The observer observes the light in the integrating sphere from the observation hole and changes the luminous intensity of the pure monochromatic light of the light source to be measured by adjusting the resistance box B. When the luminous intensity of the light source to be measured is adjusted to a certain value, the observer's sense of flicker of the pure monochromatic light and the reference light reaches the 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 reach equilibrium;

[0038] S5. Through the measurement hole, measure the spectral radiant fluxes Φ e (λ) of the pure monochromatic light and the reference light in the integrating sphere when the light source to be measured and the reference light source emit light alone. The reciprocal of the ratio is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. Determine the spectral luminous efficiency of the reference light, and the sensitivity of the observer's human eye to the monochromatic light emitted by the light source to be measured, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0039] The present invention also provides a method for accurately measuring the spectral luminous efficiency function of the human eye. It is characterized in that this method also uses the system designed above for measurement. This method is the "extrapolation measurement method", and it includes the following steps:

[0040] S1. Adjust the sliding resistor so that the light emitted by the light source to be measured is the mixed light formed by doping after the monochromatic light source and the white doped light source emit light together;

[0041] Among them, the proportion of the pure monochromatic light emitted by the monochromatic light source in the mixed light is 10-90%; it can be understood that the white light emitted by the white doped light source accounts for 90-10% of the mixed light. After doping with white light, the color purity of the monochromatic light will decrease, that is, the color purity of the mixed light is lower than that of the pure monochromatic light;

[0042] S2. Use the DC power supply to supply power to the PWM signal generator, so that it alternately outputs pulse square wave signals, that is, the light emission signals 0 / 1;

[0043] S3. Through the splitter, decode the received light emission signal. When the output of its truth table is 0, trigger MOS transistor A to drive the reference light source to emit light. When the output of the truth table is 1, trigger MOS transistor B to drive the light source to be measured to emit light, so that the light emitted by the reference light source and the light source to be measured flashes alternately;

[0044] S4. The observer observes the light in the integrating sphere from the observation hole and changes the luminous intensity of the mixed light of the light source to be measured by adjusting the resistance box B. When the luminous intensity of the light source to be measured is adjusted to a certain value, the sense of light flashing of the mixed light and the reference light felt by the observer reaches the 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 reach equilibrium;

[0045] S5. Through the measurement hole, measure the spectral radiant fluxes Φ e (λ) of the mixed light and the reference light in the integrating sphere when the light source to be measured and the reference light source emit light alone, so as to obtain the spectral radiant flux of the reference light source, and obtain the spectral radiant fluxes of the mixed light when the proportion of monochromatic light is 10-90% at the same luminous intensity;

[0046] S6. According to the measurement data of the spectral radiant fluxes of the mixed light when the proportion of monochromatic light is 10-90%, obtain the spectral radiant flux of the light source to be measured when the proportion of monochromatic light is 100% through non-linear fitting, that is, obtain the spectral radiant flux of pure monochromatic light through non-linear fitting;

[0047] The reciprocal of the ratio of the spectral radiant flux of the pure monochromatic light obtained through non-linear fitting to the spectral radiant flux of the reference light is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's human eye to the pure monochromatic light, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0048] Further, a method for accurately measuring the spectral luminous efficiency function of the human eye: Intersect the spectral radiant flux data of pure monochromatic light measured by the "direct measurement method" with the spectral radiant flux data of pure monochromatic light obtained by non-linear fitting in the "extrapolation measurement method", take the intersection part of the data, and then compare the spectral radiant flux data of the intersection part with the spectral radiant flux of the reference light. The reciprocal of the ratio is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's human eye to the pure monochromatic light, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0049] Specifically, the measurement accuracy of both the "direct measurement method" and the "extrapolation measurement method" is better than that of the traditional "flicker method", but the present invention also creatively takes the intersection of the data measured by the "direct measurement method" and the "extrapolation measurement method", and uses the common part of the data of the two methods as the final measurement result. Therefore, the measurement accuracy of the present invention for the spectral luminous efficiency function of the human eye is higher.

[0050] Further, a method for accurately measuring the spectral luminous efficiency function of the human eye: Step S1 further includes: First, measure the magnitude of the sliding resistor corresponding to the proportion of the pure monochromatic light emitted by the monochromatic light source in the total light emitted by the monochromatic light source and the white doped light source being 10-90%.

[0051] The measurement principle of the system and method for measuring the spectral luminous efficiency function of the human eye provided by the present invention is: The sensitivity of the human eye to light of different wavelengths within the visible range is different. Generally, we use the spectral luminous efficiency function V(λ) to describe this sensitivity. By weighted summing the spectral luminous efficiency function V(λ) and the spectral radiant flux Φ e (λ), the luminous flux is obtained, and its calculation formula is:

[0052] In the formula, K m is the maximum spectral efficiency of photopic vision, and its value is 631 lm / W. It can be seen from this that for two different monochromatic lights λ 1 , λ 2 If their luminous fluxes are equal, it can be expressed as:

[0053] Φ e (λ 1 )V(λ 1 ) = Φ e (λ 2 )V(λ 2 ), that is

[0054] It can be seen that by only measuring the ratio of the spectral radiant fluxes when the luminous intensities of two light sources are equal, the ratio of the spectral luminous efficiency functions can be obtained. Generally, the spectral luminous efficiency function at 555 nm is defined as 1, so that the spectral luminous efficiency functions at other wavelengths can be obtained.

[0055] The flicker method is a method for judging the equality of luminous quantities. In the same visual field, the reference light and the light to be measured are quickly and alternately irradiated into the visual field at a specific frequency, and by adjusting the driving current of the light source to be measured until the observer feels that the flicker has disappeared (or minimized), it is considered that the luminous intensities of the reference light and the light to be measured are equal in terms of vision. 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 flash threshold, humans can only feel the flicker of brightness and cannot feel the color flicker. From the basic theory of the flicker method, it can be known that this measurement method only includes the influence of the achromatic channel. During the process of measuring the spectral luminous efficiency function, the discreteness of the flicker method is relatively low, and only the achromatic channel has an influence, making the spectral luminous efficiency function measured by this method conform to the additivity of brightness.

[0056] Advantages of the present invention:

[0057] (1) Innovative design of the system structure: The system for accurately measuring the spectral luminous efficiency function of the human eye designed in the present invention creatively uses an integrating sphere as a tool for constructing the light environment, greatly increasing the light concentration and mixing effects, greatly reducing the power of the LED (reference light source and light source to be measured) light source, making the LED junction temperature very low and constant, with very small changes in the spectral distribution and luminous flux, and eliminating the influence of the large difference in the LED light intensity distribution on light mixing through the use of the integrating sphere, thereby greatly improving the measurement accuracy of the spectral luminous efficiency function of the human eye.

[0058] (2) The "direct measurement method" provided by the present invention is similar to the existing flicker method. However, due to the use of an integrating sphere for sufficient light mixing in the measurement system designed in the present invention, the accuracy of the spectral luminous efficiency function of the human eye measured by the "direct measurement method" developed based on this measurement system is higher than the result measured by the traditional flicker method measurement device.

[0059] (3) Innovation of measurement method: When directly using the flicker method to compare the luminances of two monochromatic lights (such as blue LED and red light), it is generally difficult to obtain a state where the mixed light of the two alternately flickering LEDs appears "non-flickering" (i.e., equal). The accuracy of the spectral luminous efficiency function of the human eye measured by the "direct measurement method" provided by the present invention is higher than that measured by the traditional flicker method measurement device, but it is still not high enough. Therefore, the present invention also developed an "extrapolation measurement method". This method creatively proposes to mix white light into the monochromatic light, reducing the purity of the monochromatic light. Then, it is easier to observe the situation where the luminosities of the two light sources, the light source to be measured and the reference light source, are equal (i.e., non-flickering) at low color purity, thus solving the problem of continuous flickering caused by differences in different colors of light and the inability to find the photometric balance point. At the same time, by changing the color purity of the light source to be measured (mixed light), the relationship between the brightness (spectral radiant flux) and color purity (proportion of monochromatic light) of the light source to be measured and the reference light source at light balance can be obtained. Furthermore, the brightness (spectral radiant flux) range of pure color light is extrapolated, and the intersection of this range and the range measured by the "direct measurement method" is used as the final accurate result, thereby greatly improving the accuracy of the measurement of the spectral luminous efficiency function of the human eye. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0061] Figure 1 is a structural schematic diagram of an existing flicker method measurement device;

[0062] Figure 2 is a structural schematic diagram of a system for accurately measuring the spectral luminous efficiency function of the human eye designed in Embodiment 1 of the present invention;

[0063] Figure 3 is Figure 2 a structural schematic diagram of the light source to be measured in, that is, a partial enlarged view of the light source to be measured;

[0064] Figure 4 is the decoding effect diagram when the truth table outputs 0 and 1 in Embodiments 2 and 3;

[0065] Figure 5 is the actual spectral radiant flux measurement result of the light source to be measured when 10 observers in Embodiment 2 observe that the luminosities of the light source to be measured and the reference light source are equal, where the 10 observers correspond to the observation orders 1 to 10 respectively;

[0066] Figure 6It is a measurement result diagram of the spectral radiant flux of the mixed light when the proportion of monochromatic light is 10-90% in Example 3, and Figure 6 The result of the spectral radiant flux when the proportion of monochromatic light is 100% is the result after non-linear fitting.

[0067] Markings in the figure: 1 - DC power supply, 2 - PWM signal generator, 3 - splitter, 4 - MOS transistor A, 5 - resistor box A, 6 - MOS transistor B, 7 - resistor box B, 8 - reference light source, 9 - light source to be measured, 10 - constant voltage power supply, 11 - integrating sphere, 12 - light source hole, 13 - observation hole, 14 - light baffle, 91 - monochromatic light source, 92 - white doped light source, 93 - sliding resistor. Specific embodiments

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is 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 thus cannot be understood as a limitation of 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 quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0070] Example 1

[0071] As Figure 2 and Figure 3 shown, in this Example 1, a system for accurately measuring the spectral luminous efficiency function of the human eye is designed. The system includes:

[0072] A DC power supply 1 for supplying power to the PWM signal generator 2;

[0073] A PWM signal generator 2, electrically connected to the DC power supply 1, for alternately outputting light signals 0 / 1; wherein, the signal frequency is 25 Hz, the duty cycle of the 0 / 1 signal is 50%, and the pulse duration of 0 / 1 is 1:1;

[0074] A splitter 3, for receiving the light signal 0 or light signal 1 output by the PWM signal generator 2;

[0075] A MOS transistor A 4, connected to the splitter 3 and its output terminal connected to a resistor box A 5;

[0076] A MOS transistor B 6, connected to the splitter 3 and its output terminal connected to a resistor box B 7;

[0077] A reference light source 8 (using a phosphor-converted LED with a color temperature of 6500K), electrically connected to the output terminal of the resistor box A 5 and controlled by it for the light emission intensity;

[0078] A light source under test 9, electrically connected to the output terminal of the resistor box B 7 and controlled by it for the light emission intensity;

[0079] A constant voltage power supply 10, electrically connected to the MOS transistor A 4 and the MOS transistor B 6, and controlling the constant voltage power supply 10 to supply power to the reference light source 8 and the light source under test 9 respectively through the MOS transistor A 4 and the MOS transistor B 6;

[0080] And an integrating sphere 11, the inner wall of which is provided with a reflective layer, and further provided with a light source hole 12, an observation hole 13 and a measurement hole (not shown in the figure), the reference light source 8 and the light source under test 9 are arranged in the light source hole 12 and the reference light source 8 and the light source under test 9 are inside the integrating sphere 11, so that the two light sources are close to each other but do not contact each other, and also do not contact the inner wall of the integrating sphere 11;

[0081] Among them, as Figure 3 shown, the light source under test 9 includes a monochromatic light source 91 (using a monochromatic LED, which emits blue light with a wavelength of 456 nm), a white doped light source 92 (using a phosphor-converted LED with a color temperature of 6500K) and a sliding resistor 93; the sliding resistor 93 is used to adjust the light emission ratio of the monochromatic light source 91 and the white doped light source 92, so that the light emitted by the light source under test 9 is pure monochromatic light or a mixed light of monochromatic light and white light mixed in proportion;

[0082] Among them, when the light signal provided by the PWM signal generator 2 is 0, the MOS transistor A 4 is triggered by the splitter 3 to drive the reference light source 8 to emit light; when the light signal provided by the PWM signal generator 2 is 1, the MOS transistor B 6 is triggered by the splitter 3 to drive the light source under test 9 to emit light.

[0083] Specifically, for the system for accurately measuring the spectral luminous efficiency function of the human eye designed in the above Embodiment 1, the integrating sphere 11 is set as a steel three-hole spherical structure, and its inner wall is sprayed with a barium sulfate reflection layer, and the reflectivity of light with wavelengths from 380 to 780 nm is higher than 95%; the diameter of the integrating sphere 11 is set to 50 cm, and the centers of the light source hole 12 and the observation hole 13 are set to be on the same straight line as the center of the integrating sphere 11, and the aperture is set to 5 cm. A circular light blocking plate 14 with a diameter of about 20 cm is also provided about 10 cm in front of the observation hole 13 (the center of the baffle 14 is located between the center of the observation hole 13 and the center of the integrating sphere 11). Its function is to block the direct light source part of the reference light source 8 and the light source to be measured 9 from reaching the human eye, so that the light observed by the observer is uniform and has been fully reflected by the inner wall of the integrating sphere 11; the measurement hole is arranged around the observation hole 13 for the purpose of placing an illuminometer or a radiometer to measure the spectral radiant flux Φ e (λ) of the reference light source 8 and the light source to be measured 9.

[0084] Specifically, for the system for accurately measuring the spectral luminous efficiency function of the human eye designed in the above Embodiment 1, the circuit connections of each functional module are as follows:

[0085] The PWM signal generator 2 (model number YYPWM1), its DC + interface is connected to the positive pole of the DC power supply 1, the GND and DC - interfaces are connected to the negative pole of the DC power supply 1, and the PWM interface is connected to the A0 pin of the splitter 3;

[0086] The splitter 3 (74LS138 decoder), its A1 and S1 pins are connected to the positive pole, A2, Y7 pins are connected to the negative pole, the Vcc pin is connected to the positive pole of the DC power supply 1; the GND pin is connected to the negative pole of the DC power supply 1; The pin is connected to the IN + interface of the MOS transistor A, and is connected to the IN + interface of the MOS transistor B;

[0087] The MOS transistor A, the pulse trigger module, input: the IN + interface is connected to the pin; the IN - interface is connected to the IN - interface of the MOS transistor B; output: the DC - interface is connected to the DC - interface of the MOS transistor B and the negative pole of the constant voltage power supply 10, the DC + interface is connected to the DC + interface of the MOS transistor B; the OUT + interface is connected to the positive pole of the resistance box A, and the OUT - interface is connected to the positive pole of the reference light source 8;

[0088] The MOS transistor B, the pulse trigger module, input: the IN + interface is connected to Pin; IN - interface is connected to the IN - interface of MOS transistor 1 and grounded; Output: The DC - interface is connected to the DC - interface of MOS transistor A, the DC + interface is connected to the DC + interface of MOS transistor A and the positive pole of the constant - voltage power supply, and the OUT + interface is connected to the positive pole of resistor box B; The OUT - interface is connected to the positive pole of the light source to be measured 9.

[0089] Resistor box A 5, the positive pole of resistor box A 5 is connected to the OUT + interface of MOS transistor A 4, and the negative pole of resistor box A 5 is connected to the negative pole of reference light source 8.

[0090] Resistor box B 7, the positive pole of resistor box B 7 is connected to the OUT + interface of MOS transistor B 6, and the negative pole of resistor box B 7 is connected to the negative pole of the light source to be measured 9.

[0091] Reference light source 8, its positive pole is connected to the OUT - interface of MOS transistor A 4, and its negative pole is connected to the negative pole of resistor box A 5.

[0092] Light source to be measured 9, its positive pole is connected to the OUT - interface of MOS transistor B 6, and its negative pole is connected to the negative pole of resistor box B 7.

[0093] Embodiment 2

[0094] Embodiment 2 of the present invention provides a method for accurately measuring the spectral luminous efficiency function of the human eye. This method uses the system designed in Embodiment 1 above for measurement. This method is the "direct measurement method", and it includes the following specific steps:

[0095] S1. Adjust the sliding resistor 93 to make the white doped light source 92 not emit light and the monochromatic light source 91 emit light, so that all the light emitted by the light source to be measured 9 is the pure monochromatic light emitted by the monochromatic light source 91 (wherein, the monochromatic light source 91 is a blue LED with a wavelength of 456 nm for emission).

[0096] S2. Use the DC power supply 1 to supply power to the PWM signal generator 2 at a voltage of 5V, so that the PWM signal generator 2 is driven by electricity to generate a pulsed square - wave signal, and set the signal to a frequency of 25 Hz and a duty cycle of 50, and output it to the splitter 3, that is, alternately output the pulsed square - wave signal, that is, the light - emitting signal 0 / 1.

[0097] S3. The received luminous signal is decoded by the splitter 3. When the truth table output is 0, the PWM high-level signal is output to the MOS transistor A 4, and the low-level signal is output to trigger the MOS transistor B 6, thereby triggering the MOS transistor A 4 to drive the reference light source 8 (phosphor-converted LED with a color temperature of 6500k) to emit light; when the truth table output is 1, the PWM high-level signal is output to the MOS transistor B 6, and the low-level signal is output to trigger the MOS transistor A 4, thereby triggering the MOS transistor B 6 to drive the light source under test 9 (equivalent to a monochromatic light source 91) to emit light, so that the lights emitted by the reference light source 8 and the light source under test 9 alternately flash. When the decoded PWM signal lights up the two LED lights, an alternating flashing effect will be presented. The decoding effect is as Figure 4 shown;

[0098] S4. The observer observes the light in the integrating sphere 11 from the observation hole 13 and changes the luminous intensity of the pure monochromatic light of the light source under test 9 by adjusting the resistance box B 7. When the luminous intensity of the light source under test 9 is adjusted to a certain value, the observer's sense of flicker between the pure monochromatic light and the reference light reaches the minimum or disappears. At this time, it is considered that the luminous intensities (brightnesses) of the reference light source 8 and the light source under test 9 are equal, reaching an equilibrium state;

[0099] S5. By placing a radiometer in the measurement hole, the spectral radiant fluxes Φ e (λ) of the pure monochromatic light and the reference light in the integrating sphere 11 when the light source under test 9 and the reference light source 8 emit light separately are measured. The reciprocal of the ratio is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's human eye to the monochromatic light emitted by the light source under test 9, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0100] Specifically, for the "direct measurement method" provided in the above Embodiment 2, the reference light source 8 is a phosphor-converted LED with a color temperature of 6500k. Adjust the Figure 3 sliding resistor 92 to the rightmost side, then the monochromatic light source 91 is on and the white doped light source 92 is off. In this way, the light source under test 9 is the monochromatic light source 91; by adjusting the resistance box B 7 to change the luminous intensity of the pure monochromatic light of the monochromatic light source 91 (light source under test 9) until the human eye can no longer feel the flicker (or the flicker is minimized) between the monochromatic light and the reference light. At this time, it is considered that the brightness (luminous flux) of the light source under test 9 and the reference light source 8 is equal, that is, it satisfies Φ e (λ 1 )V(λ 1 ) = Φ e (λ 2 )V(λ 2 ), where λ 1 , λ 2They can respectively represent the light to be measured and the reference light. Then, measure the illuminance (spectral radiant flux) of the light source 9 to be measured and the reference light source 8 on the inner wall of the integrating sphere 11. The reciprocal of the ratio thereof is the ratio of the spectral luminous efficiency of the light source to be measured and the reference light source.

[0101] Note: Since the light source 9 to be measured and the reference light source 8 emit light alternately, if they are equally bright, then for the cases of "the light source 9 to be measured is on and the reference light source 8 is off" and "the light source 9 to be measured is off and the reference light source 8 is on", the human eye cannot sense the change in brightness and there is no flicker (that is, the luminous intensities are equal and reach equilibrium), which is what this means.

[0102] Specifically, in the above-mentioned Embodiment 2, when the spectral radiant flux of the set reference light source 8 on the inner wall of the integrating sphere is measured to be 76.8, when 10 observers observe that the light source 9 to be measured and the reference light source 8 have equal brightness, measure the spectral radiant flux of the light source 9 to be measured (that is, the monochromatic light source 91) on the inner surface of the integrating sphere 11. The results are as Figure 5 shown. From Figure 5 the results, it can be seen that the spectral radiant flux is not a fixed value but a range value. For example, for Observer No. 1, in the range where the spectral radiant flux of the light source 9 to be measured is about 46.5 to 50.5, the light source 9 to be measured and the reference light source 8 look equally bright. This range is relatively large. The reason is that for lights of different colors, the responses of photoreceptor cells are different. Therefore, the accuracy of the measurement result is not high. In order to reduce the range and improve the measurement accuracy, the present invention also provides an "extrapolation measurement method", as shown in the following Embodiment 3.

[0103] Embodiment 3

[0104] This Embodiment 3 provides a method for accurately measuring the spectral luminous efficiency function of the human eye. This method uses the system designed in the above-mentioned Embodiment 1 for measurement. This method is the "extrapolation measurement method", which includes the following specific steps:

[0105] S1. Adjust the sliding resistor 93 so that the light emitted by the light source 9 to be measured is a mixed light formed by the co-emission of the monochromatic light source 91 and the white doped light source 92; the monochromatic light source 91 is a blue LED with a wavelength of 456 nm for light emission, and the white doped light source 92 is a phosphor-converted LED with a color temperature of 6500K;

[0106] Among them, by adjusting the sliding resistor 93, the proportion of the pure monochromatic light emitted by the monochromatic light source 91 in the mixed light is 10-90%;

[0107] S2. Use the DC power supply 1 to supply power to the PWM signal generator 2 at a voltage of 5V, so that the PWM signal generator 2 is driven by electricity to generate a pulsed square wave signal, and set the signal to a frequency of 25 Hz and a duty cycle of 50, and output it to the splitter 3, that is, alternately output a pulsed square wave signal, that is, a light emission signal 0 / 1;

[0108] S3. The received luminous signal is decoded by the splitter 3. When the truth table output is 0, the PWM high-level signal is output to the MOS transistor A 4, and the low-level signal is output to trigger the MOS transistor B 6, thereby triggering the MOS transistor A 4 to drive the reference light source 8 (phosphor-converted LED with a color temperature of 6500K) to emit light; when the truth table output is 1, the PWM high-level signal is output to the MOS transistor B 6, and the low-level signal is output to trigger the MOS transistor A 4, thereby triggering the MOS transistor B 6 to drive the light source under test 9 (mixed light source) to emit light, causing the lights emitted by the reference light source 8 and the light source under test 9 to alternately flash. When the decoded PWM signal lights up the reference light source 8 and the light source under test 9, an alternating flashing effect will be presented, and its decoding effect is as Figure 4 shown;

[0109] S4. The observer observes the light in the integrating sphere 11 from the observation hole 13 and changes the luminous intensity of the mixed light of the light source under test 9 by adjusting the resistance box B 7. When the luminous intensity of the light source under test 9 is adjusted to a certain value, the flickering sensation of the mixed light and the reference light felt by the observer reaches the minimum or disappears. At this time, it is considered that the luminous intensities (brightness) of the reference light source 8 and the light source under test 9 are equal, reaching an equilibrium state;

[0110] S5. By placing a radiometer in the measurement hole, the spectral radiant fluxes of the mixed light and the reference light in the integrating sphere 11 when the light source under test 9 and the reference light source 8 emit light separately are measured respectively, so as to obtain the spectral radiant flux of the reference light source 8, and the spectral radiant fluxes of the mixed light when the proportion of monochromatic light is 10 - 90% respectively at the same luminous intensity are obtained. The results are as Figure 6 shown;

[0111] S6. Based on the measurement data of the spectral radiant fluxes of the mixed light when the proportion of monochromatic light is 10 - 90%, the spectral radiant flux of the light source under test 9 when the proportion of monochromatic light is 100% is obtained through non-linear fitting (as Figure 6 shown), that is, the spectral radiant flux of pure monochromatic light (the proportion of monochromatic light in the mixed light is 100%) is obtained through non-linear fitting;

[0112] The reciprocal of the ratio of the spectral radiant flux of the pure monochromatic light obtained through non-linear fitting to the spectral radiant flux of the reference light is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's human eye to this pure monochromatic light, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0113] Specifically, in the above-mentioned Embodiment 3, the reference light source 8 remains unchanged, which is a phosphor-converted LED with a color temperature of 6500K, Figure 3The sliding resistor 93 in it is divided into 10 gears, so that the proportion of the light emitted by the monochromatic light source 91 in the total light emitted by the monochromatic light source 91 and the white doped light source 92 can be adjusted to 10-100% (note that the sliding resistor 93 is not evenly divided into 10 resistance gears, but is divided according to the light emission proportion of the monochromatic light source 91. In fact, it is necessary to measure the resistance value corresponding to each gear first, otherwise the appropriate light emission proportion of the monochromatic light source 91 cannot be adjusted during subsequent use).

[0114] When the spectral radiant flux of the reference light source 8 on the inner wall of the integrating sphere in Example 3 is 76.8, the measured data of the spectral radiant flux of the mixed light when the proportion of the monochromatic light is 10-90% are as follows Figure 6 As shown, it can be seen that the radiant flux and the proportion of the monochromatic light are very regular. Therefore, in the present invention, the spectral radiant flux of the mixed light when the proportion of the monochromatic light is 10-90% is actually measured, and then the spectral radiant flux data when the proportion of the monochromatic light is 100% (pure monochromatic light) is obtained by non-linear fitting.

[0115] Example 4

[0116] This Example 4 also provides a method for accurately measuring the spectral luminous efficiency function of the human eye. This method uses the system designed in the above Example 1 for measurement. The method is as follows

[0117] The spectral radiant flux data of the pure monochromatic light measured in the "direct measurement method" of Example 2 is intersected with the spectral radiant flux data of the pure monochromatic light obtained by non-linear fitting in the "extrapolation measurement method" of Example 3, and the intersection part of the data is taken. Then, it is compared with the spectral radiant flux of the reference light. The reciprocal of the ratio is the ratio of the spectral luminous efficiency of the pure monochromatic light to the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's human eye to the pure monochromatic light, that is, the spectral luminous efficiency function V(λ), can be obtained.

[0118] In the above Example 4, the range of the spectral radiant flux of the 100% monochromatic light (pure monochromatic light, that is, the light to be measured) obtained by non-linear fitting in the "extrapolation measurement method" is intersected with the range of the spectral radiant flux of the monochromatic light (light to be measured) obtained by the "direct measurement method", and the intersection part is used as the final accurate value. There is no doubt that the final result error is less than or equal to the results measured by the "extrapolation measurement method" and the "direct measurement method", thus greatly improving the measurement accuracy of the spectral luminous efficiency function of the human eye.

[0119] In view of the problem that it is actually difficult to adjust two monochromatic lights to non - flickering in the existing flicker method, the present invention creatively proposes to incorporate white light into the monochromatic light to obtain a light source to be measured with low color purity. Then, it is easier to observe the equal luminous intensity of the two light sources under low color purity. By changing the color purity of the light source to be measured (i.e., changing the proportion of the monochromatic light in the mixed light), the relationship between the spectral radiant flux and the color purity (the proportion of the monochromatic light in the mixed light) when the reference light source and the light source to be measured reach the light balance (non - flickering) observable by the human eye is obtained. Furthermore, through non - linear fitting and extrapolation, the spectral radiant flux range at pure color (the proportion of monochromatic light is 100%) is obtained, and the common part of the extrapolated range and the measured value range is taken as the final accurate result, thus greatly improving the measurement accuracy.

[0120] In view of the problems that it is difficult to remix light for LEDs, the light distribution is inconsistent, and it is easily affected by the junction temperature, etc., the system designed by the present invention adopts an integrating sphere to allow the light to be fully reflected in the integrating sphere 11. A higher illuminance in the observation area can be obtained with a smaller driving power, reducing the influence of the LED junction temperature and light distribution on the light stability. The present invention uses a digital circuit for power supply and a power amplification circuit as the driving power source, ensuring that the light source can change rapidly in the millisecond level.

[0121] The test of the present invention is convenient. Its core steps have no obvious difference from the existing "flicker method". The test method of the present invention has low requirements for the light source and is convenient for popularization and use. Further, the method of the present invention can combine the "extrapolation measurement method" and the "direct measurement method", and its test results are more accurate. At the same time, compared with the existing flicker method measurement device, the measurement system designed by the present invention has a simpler structure and is convenient for assembly.

[0122] The above are the preferred embodiments of the present invention, which are only used to explain the present invention and are not used to limit the present invention. Any obvious changes or variations derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A system for accurately measuring the spectral luminous efficiency function of the human eye, characterized in that: The system includes: A direct current power supply (1), used to supply power to a PWM signal generator (2); A PWM signal generator (2), which is electrically connected to the DC power supply (1) and is used to alternately output a light emitting signal 0 / 1; A splitter (3), used for receiving the light-emitting signal 0 or the light-emitting signal 1 output by the PWM signal generator (2); MOS tube A (4), which is connected to the splitter (3) and has an output end connected to a resistor box A (5); MOS tube B (6), which is connected to the splitter (3), and the output end of which is connected to the resistor box B (7); A reference light source (8), which is electrically connected to the output end of the resistor box A (5) and has a luminous intensity controlled thereby; A light source to be tested (9), which is electrically connected to the output end of the resistor box B (7) and has its luminous intensity controlled by the output end; A constant voltage power supply (10), which controls the constant voltage power supply (10) through the MOS tube A (4) and the MOS tube B (6) to respectively supply power to the reference light source (8) and the light source to be measured (9); and an integrating sphere (11), the inner wall of which is provided with a reflective layer, and a light source hole (12), an observation hole (13) and a measurement hole are also provided thereon, the reference light source (8) and the light source to be measured (9) are arranged in the light source hole (12); The light source (9) to be tested comprises a monochromatic light source (91), a white doped light source (92) and a sliding resistor (93); the sliding resistor (93) is used to adjust the light emission ratio of the monochromatic light source (91) and the white doped light source (92), so that the light emitted by the light source (9) to be tested is pure monochromatic light or a mixed light of monochromatic light and white light in proportion. When the light-emitting signal provided by the PWM signal generator (2) is 0, the MOS tube A (4) is triggered by the splitter (3) to drive the reference light source (8) to emit light; when the light-emitting signal provided by the PWM signal generator (2) is 1, the MOS tube B (6) is triggered by the splitter (3) to drive the light source to be tested (9) 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 (11) is a steel sphere, and a white reflecting layer is sprayed on the inner wall thereof.

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 light with a wavelength of 380 to 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 (12) 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 (14) 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. The system for accurately measuring the spectral luminous efficiency function of human eyes according to claim 1, characterized in that: The reference light source (8) and the light source to be measured (9) are arranged closely together, do not contact each other, and do not contact the inner wall of the integrating sphere (11).

7. A method for accurately measuring the spectral luminous efficiency function of the human eye, characterized in that: The method uses the system described in any one of claims 1 to 6 for measurement. The method is a "direct measurement method" and comprises the following steps: S1, adjusting the sliding resistor (93) so that the light emitted by the light source to be tested (9) is pure monochromatic light emitted by the monochromatic light source (91), and the white doped light source (92) does not emit light; S2, using the DC power supply (1) to power the PWM signal generator (2), so that it alternately outputs pulse square wave signals, i.e., light emitting signals 0 / 1; S3, decoding the received light emitting signal through the splitter (3), and when the truth table output is 0, triggering the MOS tube A (4) to drive the reference light source (8) to emit light, and when the truth table output is 1, triggering the MOS tube B (6) to drive the light source to be measured (9) to emit light, so that the light emitted by the reference light source (8) and the light source to be measured (9) flashes alternately; S4, the observer observes the light in the integrating sphere (11) from the observation hole (13) and changes the luminous intensity of the pure monochromatic light of the light source (9) to be measured by adjusting the resistance box B (7). When the luminous intensity of the light source (9) to be measured is adjusted to a certain value, the flickering sensation of the pure monochromatic light and the reference light felt by the observer reaches a minimum or disappears. At this time, it is considered that the luminous intensity of the reference light source (8) and the light source (9) to be measured is equal, and a balance is achieved; S5. Through the measuring hole, respectively measure the spectral radiation flux Φ of the pure monochromatic light and the reference light in the integrating sphere (11) when the light source to be measured (9) and the reference light source (8) emit light independently. e (λ), the reciprocal of which is the ratio of the spectral luminous efficiency of pure monochromatic light to that of the reference light. By determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's eye to the monochromatic light emitted by the light source (9) to be measured can be obtained, namely, the spectral luminous efficiency function V(λ).

8. A method for accurately measuring the spectral luminous efficiency function of the human eye, characterized in that: The method uses the system described in any one of claims 1 to 6 to perform measurement. The method is an "extrapolation measurement method" and comprises the following steps: S1, adjusting the sliding resistor (93) so that the light emitted by the light source to be tested (9) is mixed light formed by the combined emission of the monochromatic light source (91) and the white doped light source (92); Wherein, the pure monochromatic light emitted by the monochromatic light source (91) accounts for 10 to 90% of the mixed light; S2, using the DC power supply (1) to power the PWM signal generator (2), so that it alternately outputs pulse square wave signals, i.e., light emitting signals 0 / 1; S3, decoding the received light emitting signal through the splitter (3), and when the truth table output is 0, triggering the MOS tube A (4) to drive the reference light source (8) to emit light, and when the truth table output is 1, triggering the MOS tube B (6) to drive the light source to be measured (9) to emit light, so that the light emitted by the reference light source (8) and the light source to be measured (9) flashes alternately; S4, the observer observes the light in the integrating sphere (11) from the observation hole (13) and changes the luminous intensity of the mixed light of the light source (9) to be measured by adjusting the resistor box B (7). When the luminous intensity of the light source (9) to be measured is adjusted to a certain value, the flickering feeling of the mixed light and the reference light felt by the observer reaches a minimum or disappears. At this time, it is considered that the luminous intensity of the reference light source (8) and the light source (9) to be measured is equal and a balance is achieved; S5. Through the measuring hole, respectively measure the spectral radiation flux Φ of the mixed light and the reference light in the integrating sphere (11) when the light source to be measured (9) and the reference light source (8) emit light separately. e (λ), thereby obtaining the spectral radiant flux of the reference light source (8), and obtaining the spectral radiant flux of the mixed light when the monochromatic light accounts for 10 to 90% respectively under the same luminous intensity; S6. Based on the above-mentioned spectral radiant flux measurement data of the mixed light when the monochromatic light accounts for 10-90%, the spectral radiant flux of the light source (9) to be measured when the monochromatic light accounts for 100% is obtained by nonlinear fitting, that is, the spectral radiant flux of pure monochromatic light is obtained by nonlinear fitting; The inverse of the ratio of the spectral radiant flux of pure monochromatic light and the spectral radiant flux of reference light obtained by nonlinear fitting is the ratio of the spectral luminous efficiency of pure monochromatic light to that of the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's eye to the pure monochromatic light can be obtained, that is, the spectral luminous efficiency function V(λ).

9. A method for accurately measuring the spectral luminous efficiency function of human eyes according to claim 7 or 8, characterized in that: The spectral radiant flux data of pure monochromatic light measured in the "direct measurement method" is intersected with the spectral radiant flux data of pure monochromatic light obtained by nonlinear fitting in the "extrapolation measurement method", and the intersection of the data is taken, and then compared with the spectral radiant flux of the reference light. The inverse of the ratio is the ratio of the spectral luminous efficiency of pure monochromatic light to that of the reference light. After determining the spectral luminous efficiency of the reference light, the sensitivity of the observer's eye to the pure monochromatic light can be obtained, that is, the spectral luminous efficiency function V(λ).

10. The method for accurately measuring the spectral luminous efficiency function of human eyes according to claim 8, characterized in that: Step S1 also includes: first measuring the size of the corresponding sliding resistance (93) when the ratio of pure monochromatic light emitted by the monochromatic light source (91) to the total light emitted by the monochromatic light source (91) and the white doped light source (92) is 10-90%.

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