Luminous flux metering method

Abstract

The invention provides a luminous flux metering method. The luminous flux metering method comprises the steps that area information of a to-be-monitored area is determined based on an irradiated area, and sampling points in the to-be-monitored area are determined; wherein the number of the sampling points is N, and N is an integer greater than or equal to 1; placing an irradiance meter at the sampling point; wherein the irradiance meter is used for collecting irradiation data of a to-be-monitored area at a sampling point; and calculating the luminous flux and irradiance of the to-be-monitored area based on the irradiation data. According to the luminous flux metering method provided by the invention, the sampling points are set according to the area size of the to-be-measured area of the irradiated area, flexible measurement and characterization of luminous flux under scenes of different distances and different area areas are realized, the problem of inaccurate luminous flux metering caused by non-uniform light spots or unstable luminous flux is avoided, and the luminous flux metering accuracy is improved. The method is suitable for various application scenes in different time periods so as to realize accurate measurement and characterization of the luminous flux.

Description

Technical Field

[0001] The present invention relates to the technical field of luminous flux measurement, and in particular to a luminous flux measurement method. Background Art

[0002] With the development of semiconductor devices, light illumination has become more popular, and more and more unnatural light appears in people's daily lives, such as incandescent lamps, neon lamps, ultraviolet lamps, and light emitted by screens of electronic devices such as mobile phones and computers. These unnatural lights not only bring people a more colorful life, but may also bring harm, such as affecting the rhythm of animals and plants, damaging eyesight, etc. In order to avoid being invaded and disturbed by excessive light, in daily use and experiments, people need to know the harmful nature and dosage of light when they are exposed to this kind of light so as to protect themselves. Therefore, it is necessary to determine the measurement method to measure the energy of light, obtain reliable light energy information to understand the energy of light, and control the energy of light at an appropriate level.

[0003] Luminous flux is one of the parameters that can effectively reflect light energy. Therefore, the accuracy of luminous flux measurement is very important for the accurate evaluation of light energy. The existing luminous flux measurement methods lack unified specifications. Common luminous flux measurement methods include the following two methods: chemical titration, which is more complicated and difficult to implement and accurately evaluate. Or, it is applied to close-range measurement scenarios, such as measuring luminous flux at a distance of 1 cm from the laser light outlet. This method is often used in long-distance measurement scenarios. Inaccurate luminous flux measurement often occurs. How to achieve accurate and convenient measurement of the luminous flux of the target area in a variety of distance measurement scenarios is an urgent problem to be solved. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The present invention provides a luminous flux measurement method, which is used to at least partially solve one of the above technical problems.

[0006] (II) Technical solution

[0007] On one hand, the present invention provides a luminous flux metering method, comprising: determining sampling points in the to-be-monitored area based on the area information of the to-be-monitored area of ​​the irradiated area; wherein the number of sampling points is N, and N is an integer greater than or equal to 1; placing a radiometer at the sampling point; wherein the radiometer is used to collect irradiation data of the to-be-monitored area at the sampling point, and the irradiation data at least includes irradiance and luminous flux; and calculating the luminous flux and irradiance of the to-be-monitored area based on the irradiation data.

[0008] Optionally, determining sampling points in the area to be detected based on area information includes: acquiring area information of the area to be monitored; determining the number of sampling points in the area to be monitored according to the area information; and arranging the sampling points in the area to be monitored based on preset rules when the number of sampling points is not 1.

[0009] Optionally, the preset rules include: an axial symmetry rule, a central symmetry rule and a parallel rule.

[0010] Optionally, placing a radiometer at the sampling point includes: obtaining the wavelength of the light source of the area to be monitored; selecting a corresponding radiometer based on the wavelength of the light source; wherein the measurement range of the radiometer is not less than the wavelength range of the target light source of the area to be monitored.

[0011] Optionally, when the wavelength of the light source exists in multiple bands, a filter is placed at the radiometer to screen the target band.

[0012] Optionally, placing a radiometer at the sampling point includes: placing the radiometer perpendicular to the area to be monitored.

[0013] Optionally, calculating the luminous flux of the area to be monitored based on the irradiation data includes: acquiring instantaneous irradiation data and cumulative irradiation data within a specified time period; and determining a method for calculating the luminous flux based on a change trend of the irradiation data within the specified time period.

[0014] Optionally, acquiring instantaneous irradiation data and cumulative irradiation data within a specified time period includes: setting an interval collection time of the irradiance meter so that the irradiance meter collects multiple groups of irradiation data.

[0015] Optionally, based on the changing trend of the irradiation data within a specified time period, a method for calculating the luminous flux is determined, including: comparing the changing trend of the instantaneous irradiation data in chronological order; when the changing condition of the irradiation data is less than a preset changing range, determining the luminous flux by calculating the average value of the instantaneous irradiation data; when the changing condition of the instantaneous irradiation data shows an upward or downward trend, calculating the luminous flux by indirect measurement.

[0016] Optionally, the luminous flux is calculated by indirect measurement, including: obtaining the cumulative irradiation data of each sampling point within a specified time; calculating the luminous flux of the sampling point based on the cumulative irradiation data and the specified time; and calculating the luminous flux of the area to be monitored based on the luminous flux of each sampling point.

[0017] (III) Beneficial effects

[0018] The luminous flux measurement method provided by the present invention has at least the following beneficial effects:

[0019] By setting multiple measurement targets and measuring irradiation data at different time periods, and calculating the luminous flux based on multiple sets of irradiation data, the problem of inaccurate luminous flux measurement under various distances and different thermal effect light sources is effectively solved, and accurate evaluation of light energy in target areas of any shape and any distance is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The flowchart of the luminous flux measurement method in the embodiment of the present invention is schematically shown;

[0021] Figure 2 Schematically shows an example diagram of sampling points in a small circular area in an embodiment of the present invention;

[0022] Figure 3 Schematically shows an example diagram of sampling points in a large rectangular area in an embodiment of the present invention;

[0023] Figure 4 The structure of the radiometer in the embodiment of the present invention is schematically shown.

[0024] [Description of Reference Numerals]

[0025] 1-light receiver; 2-package appearance; 3-transmission line; 4-connection plug; 5-connection jack; 6-data display screen; 7-adjustment selection button. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0027] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the subsystem or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present invention. The shapes, sizes, and positional relationships of the components in the drawings do not reflect the actual size, proportion, and actual positional relationship. In addition, in the claims, any reference symbol between brackets shall not be construed as a limitation to the claims.

[0031] Similarly, in order to simplify the present invention and help understand one or more of the various disclosed aspects, in the above description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. The description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, the center of the measurement area is generally used as the primary position for monitoring. According to the shape of the measurement area, measurement points are generally set in the edge area and in the process from the middle to the edge area. The irradiance and luminous flux of the overall monitoring area are compared and evaluated.

[0034] In the present invention, the measured information includes luminous flux and irradiance, that is, luminous flux per unit time.

[0035] In the description of the present invention, when more stable data is needed, two methods are used to measure the same monitoring point at the same time, and the most reliable one is selected as the calibration value. The test needs to be repeated more than 3 times for statistical analysis to obtain the average value, so as to obtain more stable and reliable data. The data obtained by the irradiance meter at multiple target points are combined for statistical analysis.

[0036] In the present invention, the data is measured using a radiometer. The wavelength of the light to be measured also needs to be determined when measuring the light spot energy, and the radiometer corresponding to the response band is selected accordingly. If the band to be measured is very precise, and the spectrum of the light spot emitted by the light source is wide, a filter is required to filter out clutter. When the overall light energy impact of the light source needs to be evaluated, no filter is needed.

[0037] In the description of the present invention, both direct and indirect light energy measurement and calculation methods of the irradiance meter, as well as any shape of the target measurement area and the arrangement of multiple sampling points are within the protection scope of the present invention.

[0038] The purpose of the present invention is to provide a luminous flux measurement method to achieve accurate measurement of luminous flux in areas of different distances and different areas. The present invention obtains the target measurement area by marking the area position reached by the lighting equipment, and sets multiple sampling points in the area to be monitored. The unevenness of the light spot is evaluated based on the irradiance of each sampling point, thereby evaluating the possible impact of the determined light on the irradiated object. Different methods are selected to determine the luminous flux based on the thermal stability of the light source equipment, so that the obtained luminous flux is more accurate.

[0039] Figure 1 The flowchart of the luminous flux measurement method in the embodiment of the present invention is schematically shown.

[0040] like Figure 1 As shown, the luminous flux measuring method includes operations S110 to S130.

[0041] In operation S110 , sampling points in the area to be monitored of the irradiated area are determined based on area information of the area to be monitored; wherein the number of the sampling points is N, and N is an integer greater than or equal to 1.

[0042] In some embodiments, the spot area is positively correlated with the irradiation distance, that is, the area of ​​the monitored area increases with the increase of the irradiation distance. After obtaining the area information of the monitored area at a certain distance, the number of sampling points in the monitored area is determined according to the area information.

[0043] Wherein, determining the number of sampling points in the area to be monitored according to the area information includes: determining whether the area to be monitored is a large area or a small area by means of a predetermined threshold (taking the irradiance meter receiver as a reference).

[0044] When the area to be monitored is a small area, the number of sampling points in the area to be monitored is 1, and the sampling point is set at the center of the small area, such as Figure 2 As shown, the shaded part in the figure represents the sampling point.

[0045] When the area to be monitored is a large area, the number of sampling points is greater than 1, and multiple sampling points are arranged in the area to be monitored based on preset rules, such as Figure 3 As shown in the figure, the shaded part represents the sampling point. Among them, the preset rules include: axisymmetric rule, central symmetric rule and parallel rule. Arranging the sampling points based on the preset rules can achieve better measurement results and realize accurate measurement of the light flux in the monitored area.

[0046] In operation S120, a radiometer is placed at the sampling point. The radiometer is used to collect irradiation data of the monitored area at the sampling point. The irradiation data includes at least irradiance and luminous flux. The irradiance is the luminous flux per unit time.

[0047] In some embodiments, it is necessary to select a corresponding amplitude meter for collecting irradiance data according to the wavelength of the light source in the area to be monitored. Different radiometers have different measurement ranges. When the measurement range of the radiometer is not less than (covers) the wavelength of the light source in the area to be monitored, the irradiance data obtained is more accurate. After being packaged, the radiometer is sensitive to the measured light and can respond, and transmits the signal to the connected data parts by electrical conduction, so that it is reflected in digital form. Among them, there are many types of radiometers. Due to the different light-sensitive bands of the absorbing materials, the radiometer has corresponding response wavelengths of light as the basis for judgment. For this device, when using it, place the receiver vertically in the measured area, turn on the data display, and you can get the instantaneous and cumulative data of the measurement.

[0048] Among them, the use of a radiometer to collect irradiation data has the advantages of higher accuracy and greater convenience. Compared with other irradiance measurement methods (such as titration, etc.), the radiometer has a wider range of usage scenarios. It can be used not only in laboratory scenes, but also in life scenes. The irradiation data measured by the radiometer is less affected by the environment and has stronger applicability.

[0049] Figure 4 The structure diagram of the radiometer is shown schematically. Figure 4 As shown, the irradiance meter includes a light receiver 1, a package appearance 2, a transmission line 3, a connection plug 4, a connection jack 5, a data display screen 6, and an adjustment selection button 7. The irradiance meter is placed perpendicular to the area to be monitored on the sampling point, and the connection plug 4 is inserted into the connection jack 5, and the irradiation data of the sampling point can be viewed on the data display screen.

[0050] In the specific implementation process, the use of irradiance sets to collect irradiance data of the area to be monitored at the sampling points includes: 1) demarcating the target area (i.e. the area to be monitored); 2) marking the sampling points with paper and pen (or other means); 3) the irradiance meter is turned on and ready, usually one person is responsible for operation and the other is responsible for recording data. 4) First turn on the irradiance meter, then turn on the light source; perform irradiance measurement and collect irradiance data. For example, measure 16 groups of irradiance at equal intervals of 2 minutes every 30 minutes, and record the luminous flux for 30 minutes. 5) Analyze and count the irradiance to determine the luminous flux calculation method. 6) Repeat the experiment more than 3 times to improve the accuracy of the measurement results.

[0051] When the light released by the light source device includes multiple bands, a filter can be placed at the light receiver 1 of the irradiance meter. The light of non-target bands can be absorbed by the special coating layer on the filter to achieve the screening of the target band, so that the irradiance meter only receives the light of the target band and obtains the irradiation data of the target band, avoiding the problem of inaccurate irradiation data due to the inclusion of light energy of other non-target bands.

[0052] In operation S130, the luminous flux and irradiance of the area to be monitored are calculated based on the irradiance data.

[0053] In some embodiments, if the thermal insulation effect of the light source device is good and the light irradiance is not easily affected by time, the luminous flux can be calculated by instantaneous irradiance data (i.e. irradiance). When the thermal insulation effect of the light source device is poor, it is easy to cause the output power of the light source device to be unstable, making the irradiance of the light more affected by time. At this time, it is necessary to calculate the luminous flux by cumulative irradiance data.

[0054] By setting the interval collection time of irradiance data, the irradiance meter collects multiple sets of instantaneous irradiance data, obtains multiple sets of instantaneous irradiance data within a specified time period, determines the change trend of irradiance data within a specified time period, and then obtains the thermal insulation effect of the light source equipment. The calculation method for determining the luminous flux based on the thermal insulation effect of the light source equipment.

[0055] In the specific implementation process, the method for evaluating the thermal insulation condition of the light source equipment includes: using a radiometer to monitor data at multiple sampling points, measuring the irradiance separately, comparing the change of instantaneous irradiance over time, obtaining the thermal insulation condition of the light source equipment, and then using different luminous flux calculation methods to obtain the corresponding luminous flux data.

[0056] Direct monitoring method and indirect monitoring method are used to measure and calculate irradiance and luminous flux.

[0057] Among them, the direct measurement method includes: using a radiometer to measure multiple equally spaced instantaneous irradiances, statistically deriving the average value as the average irradiance, and then combining the time to obtain the total luminous flux. The indirect measurement method includes: using a radiometer to measure the total luminous flux during the entire irradiation time, and then combining the time to obtain the average irradiance.

[0058] When the irradiance does not change significantly during the entire monitoring period and the data is relatively stable, the actual measured cumulative luminous flux is basically consistent with the luminous flux obtained by multiplying the average irradiance (the average of multiple instantaneous irradiances) and time. At this time, the direct measurement method can be used to measure the luminous flux. When the irradiance changes greatly during the monitoring time, it means that the internal heat dissipation performance of the lighting equipment is poor, which affects the output of optical power. At this time, the indirect measurement method should be used. The total luminous flux is measured using a radiometer, and then the total luminous flux is divided by time to obtain the average irradiance. Evaluate the uniformity of the spot distribution based on the luminous flux information (luminous flux and irradiance) obtained from multiple target points. The luminous flux data of the area to be monitored is taken from the average value of the luminous flux data of each sampling point.

[0059] Compare the changing trends of the instantaneous irradiation data in chronological order. If the changing conditions of the instantaneous irradiation data show an upward or downward trend, calculate the luminous flux by indirect measurement. Indirect measurement and calculation of luminous flux include: obtaining the cumulative irradiation data of each sampling point within a specified time; calculating the luminous flux of the sampling point based on the cumulative irradiation data and the specified time; and calculating the luminous flux of the area to be monitored based on the luminous flux of each sampling point. For example, 16 sets of instantaneous irradiation data within 30 minutes are obtained (i.e., measuring the instantaneous irradiance and total luminous flux once every 2 minutes). If the irradiation data show an upward or downward trend over time, the cumulative value of the luminous flux of the sampling point is valid data. Calculate the cumulative irradiation data of the sampling point and divide it by the specified measurement time (i.e., 30 minutes) to obtain the average irradiance of the sampling point. Repeat the operation in the same way for each sampling point to obtain the irradiation data of each sampling point, i.e., the total luminous flux and average irradiance. Calculate the luminous flux and average irradiance of the area to be monitored by the luminous flux and average irradiance of each sampling point. Among them, the luminous flux number of the area to be monitored is taken from the average value of the luminous flux data of each sampling point.

[0060] The luminous flux measurement method provided by the present invention sets sampling points according to the size of the area to be measured, realizes accurate measurement of luminous flux in scenes of various distances and arbitrary irradiated area areas, avoids inaccurate luminous flux measurement due to uneven light spots, and realizes accurate and convenient measurement of luminous flux. The luminous flux obtained by measuring statistics of the irradiance meter provided by the present invention. The measurable area is obtained by marking the area position reached by the lighting equipment, and the irradiance of different sizes is obtained by measuring multiple sampling points, so as to evaluate the unevenness of the light spot, and infer the possible impact of the determined light on the irradiated object. In addition, the irradiance meter measurement method can well monitor the internal packaging status of the lighting equipment. Large differences indicate that poor heat dissipation affects the service life of circuits and devices, and also has a greater impact on the irradiated objects. When the difference is small, the data consistency is better, and the irradiance obtained by measurement can be used to evaluate the luminous flux, which can better evaluate the impact of light on the irradiated objects.

[0061] The invention is applicable to the statistics of luminous flux in isoplanar illuminated areas and also to the statistics of light energy data in non-isoplanar illuminated areas. The invention standardizes a reliable calibration method for measuring the energy of light by a radiometer and realizes the principle of safe and protective device use.

[0062] The specific embodiments described above further illustrate the technical solutions of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring luminous flux, characterized in that: include: Determine sampling points in the area to be monitored based on the area information of the area to be monitored in the irradiated area; wherein the number of sampling points is N, and N is an integer greater than or equal to 1; Placing a radiometer at the sampling point; wherein the radiometer is used to collect the irradiation data of the area to be monitored at the sampling point, and the irradiation data at least includes irradiance and luminous flux; The luminous flux and irradiance of the area to be monitored are calculated based on the irradiation data.

2. The luminous flux measurement method according to claim 1, characterized in that: The step of determining the sampling points in the area to be monitored based on the area information comprises: Obtaining the area information of the area to be monitored; Determine the number of sampling points in the area to be monitored according to the area information; When the number of the sampling points is not 1, the sampling points are arranged in the area to be monitored based on a preset rule.

3. The luminous flux measurement method according to claim 2, characterized in that: The preset rules include: axial symmetry rule, central symmetry rule and parallel rule.

4. The luminous flux measurement method according to claim 1, characterized in that: Placing a radiometer at the sampling point comprises: Obtain the wavelength of the light source in the area to be monitored; A corresponding irradiance meter is selected based on the wavelength of the light source; wherein the measurement range of the irradiance meter is not less than the wavelength range of the target light source of the area to be monitored.

5. The luminous flux measurement method according to claim 4, characterized in that: Also includes: When the wavelength of the light source exists in multiple bands, a filter is placed at the irradiance meter to screen the target band.

6. The luminous flux measurement method according to claim 4, characterized in that: Placing a radiometer at the sampling point comprises: The irradiance meter is placed perpendicular to the area to be monitored.

7. The luminous flux measurement method according to claim 1, characterized in that: The calculating the luminous flux of the area to be monitored based on the irradiation data comprises: Obtain instantaneous irradiation data and cumulative irradiation data within a specified time period; Determine the calculation method of luminous flux based on the changing trend of irradiance data within a specified time period.

8. The luminous flux measurement method according to claim 7, characterized in that: The step of obtaining instantaneous radiation data and cumulative radiation data within a specified time period includes: The interval collection time of the irradiance meter is set so that the irradiance meter collects multiple groups of irradiation data.

9. The luminous flux measurement method according to claim 7, characterized in that: The calculation method for determining the luminous flux based on the change trend of the irradiation data within a specified time period includes: Compare the changing trends of instantaneous irradiation data in chronological order; When the irradiance data variation is less than a preset variation range, the luminous flux is determined by calculating the average value of the instantaneous irradiance data; When the change condition of the instantaneous irradiance data shows an upward trend or a downward trend, the luminous flux is calculated by indirect measurement.

10. The luminous flux measurement method according to claim 9, characterized in that: The method of calculating the luminous flux by indirect measurement includes: Obtain the cumulative irradiation data of each sampling point within a specified time; Calculate the luminous flux of the sampling point based on the accumulated irradiance data and the specified time; The luminous flux of the area to be monitored is calculated based on the luminous flux of each sampling point.

Images