CN114486183A - Lamp light distribution testing method and lamp light distribution measuring system - Google Patents
Lamp light distribution testing method and lamp light distribution measuring system Download PDFInfo
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Abstract
The invention provides a lamp light distribution test method and a corresponding lamp light distribution measurement system, which comprise a light distribution measurement system consisting of a sample stage, a collimation screen with neutral diffuse reflection characteristics and an imaging measurement device with an array detector, wherein the light distribution measurement system is calibrated by adopting reference light sources with different intensities and color light outputs, and the spatial light intensity distribution of the reference light sources under each intensity is known, so that the response values of each pixel of the array detector under different intensities are calibrated; the calibrated light distribution measurement system is used for measuring the space light distribution parameters of the lamp to be measured, and the problem of inaccurate measurement caused by high alignment requirement on a reference light source, large linear error, large spectrum mismatch error and the like in the prior art is effectively solved. The measuring method and the light distribution measuring system thereof can be suitable for light distribution tests of different lamps, ensure the consistency and accuracy of the measuring result, and have convenient operation and low cost.
Description
Technical Field
The invention belongs to the technical field of optical measurement, and particularly relates to a lamp light distribution test method and a corresponding lamp light distribution measurement system.
Background
The spatial light distribution, i.e. the light distribution performance, of a lamp is generally well defined depending on its use. For example, as a lighting device for an automobile, a lamp should illuminate a road and an obstacle in front of the automobile to the maximum extent, and illuminate eyes of an oncoming vehicle to the minimum extent, and the quality of light distribution performance plays an important role in safe driving, and a strict requirement is imposed on spatial light distribution of the lamp in relevant standards. Corresponding regulations are provided for the light distribution performance measuring method, device and test conditions of the lamp in relevant standards at home and abroad.
At present, the method for measuring the light distribution performance of the lamp in a laboratory is mainly realized by a distribution photometer, under the condition of a darkroom, the lamp to be measured is arranged on the distribution photometer and is measured by the luminosityThe probe measures the illumination at a long distance and obtains the light intensity through the inverse square law of the distance, namely
In the distribution photometer, the measured lamp and the luminosity probe relatively rotate to change the angle of the luminosity probe for receiving light, so that the space light intensity distribution of the measured lamp is obtained. The measurement precision is higher, but the disadvantage is that the measurement speed is slow, and the size of the lamp to be measured is not too large, otherwise the lamp cannot be installed in the instrument.
In order to realize rapid measurement, a full-screen shooting test method is also adopted at present, light emitted by a lamp to be measured is irradiated on an aiming screen, a shooting device with an area array detector is adopted to carry out space sampling on an image irradiated on a light distribution screen, then the adopted image is digitized through a computer, and each pixel point of the space sampling is reversely deduced into the illumination of each point according to a data relation base established during measurement. The method has the advantages that the testing speed is accelerated, but due to the fact that the photoelectric response nonuniformity and nonlinearity exist in each photosensitive element of the array detector, each link of the camera system also has certain distortion and noise problems, and each point in a testing area needs to be calibrated and calibrated. In order to reduce the measurement error of the rapid measurement method, the measurement system is usually calibrated by using a reference light source having the same or similar light distribution as the lamp to be measured, and the reference light source obtains an accurate light intensity distribution value in the distribution photometer method. However, for some lamps to be tested with particularly severe light distribution changes, for example, car lights, a very distinct cut-off line is formed on the light screen, the part below the cut-off line is particularly bright, and the part above the cut-off line is required to have sufficiently small illuminance. When the same type of car lamps are used as reference light sources to calibrate the rapid measurement system, if the alignment of the reference light sources is slightly deviated, the measurement result is greatly influenced. Moreover, the linearity of the camera in the measurement is generally different from that of a photometric probe in a distribution photometer by several orders of magnitude, so that when the sensitivity contrast of the evaluated lamp is strong, a measurement error is easy to generate, and generally the measurement error of a dark area part is higher than the brightness by at least one order of magnitude. In addition, if accurate photometric measurement is to be achieved, the spectral responsivity of the detector in the imaging device should be matched with the photopic efficiency function of the human eye, however, in fact, this requirement is difficult to achieve, and when the spectral distribution of the measured light source changes, a large error is generated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a lamp light distribution test method and a corresponding lamp light distribution measurement system, which calibrate the light distribution measurement system by adopting reference light sources with different intensities and color light outputs, and effectively solve the problem of inaccurate measurement caused by high alignment requirements on the reference light sources, large linear errors, large spectrum mismatch errors and the like in the prior art. The measuring method and the light distribution measuring system thereof can be suitable for light distribution tests of different lamps, ensure the consistency and accuracy of the measuring result, and have convenient operation and low cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a light distribution test method of a lamp, which comprises a light distribution measurement system consisting of a sample stage, an aiming screen with neutral diffuse reflection characteristics and an imaging measurement device with an array detector, wherein a light beam of a lamp to be tested irradiates on the aiming screen, and the imaging measurement device is aligned with the aiming screen and measures light spot information on the aiming screen; and calibrating the light distribution measuring system by adopting a reference light source, wherein the specific process is as follows: the reference light source has two or more light outputs with different intensities, light emitted by the reference light source is irradiated on the collimation screen under the light outputs with various intensities, the imaging measurement device aligns and measures light spots formed by the reference light source on the collimation screen, each point in the light spots of the collimation screen corresponds to a pixel of an array detector in the imaging measurement device, the spatial light intensity distribution of the reference light source under each intensity is known, and the response value of each pixel of the array detector under different intensities is calibrated; the calibrated light distribution measuring system measures the space light distribution parameters of the measured lamp, and the obtained measuring result is accurate. Sampling toolThe collimation screen with neutral diffuse reflection properties allows the imaging measurement device to accurately measure the spatial light distribution of the light source without interference from other items. The reference light sources with different intensities are adopted to calibrate the light distribution measuring system, so that the light distribution measuring system can be effectively calibrated, the linear error of the imaging measuring device can be reduced, and the standard data of a bright area and the calibration data of a dark area can be accurately obtained. The reference light source can be a standard light source with a quantity value, the spatial light intensity distribution of the reference light source under each intensity can be measured in a distribution photometer system in advance, or the reference light source is a temperature light source without a quantity value, the spatial light intensity distribution of the reference light source under each intensity can be measured by installing an optical detector on the collimation screen, the light emitted by the reference light source is irradiated onto the collimation screen, the illumination or spectral irradiance on the surface of the collimation screen is measured by using an array optical detector, and the illumination or spectral irradiance on the surface of the collimation screen is obtained by a formula
And converting to obtain the spatial light intensity distribution of the reference light source under each intensity.
Further, the reference light source is provided with two or more different colors, and the reference light source is used for calibrating the light distribution measuring system under the light output of each color and intensity. Specifically, the different colors include different color temperatures, such as 3000K, 4000K, 5000K, 6500K, and the like, and also include different monochromatic lights, such as red light, blue light, green light, yellow light, and the like; in the actual measurement, only calibration data having the same or similar spectral distribution as that of the lamp to be measured needs to be called during the actual measurement, or a spectral matrix can be established according to actual needs for calibration. The problem of spectrum mismatch error of the imaging measurement device can be solved through response calibration of the light distribution measurement system under the light output of each color and intensity.
Further, in the above technical solution, according to the known spatial light intensity distribution of the reference light source, the spatial position and the illumination angle of the center of the light outlet of the reference light source relative to the collimation screen, the illumination distribution E (x, y) generated by the reference light source on the collimation screen is calculated, wherein (x, y) is the illumination distribution E (x, y) in the plane of the collimation screenThe position coordinates of each point; the calibration coefficient k (i, j) of each pixel point (i, j) in the imaging measurement device is the response value M (i, j) of the pixel point and the position point of the collimation screen plane corresponding to the pixel
Ratio of the illuminance, i.e.
. Conventional imaging measurement devices typically measure brightness. The method directly calibrates the illumination by establishing the relationship between the light intensity distribution and the illumination distribution without brightness conversion, cancels the intermediate process, and can directly measure the space light distribution parameters of various lamps by the light distribution measuring system calibrated by the method.
Further, a bright area light spot formed by the reference light source on the collimation screen covers a pixel measurement area of the imaging measurement device. The bright area light spot refers to a brighter light spot area generated when light emitted by the reference light source irradiates the collimation screen, the illumination uniformity in the area is good, and the condition of illumination polar place does not exist. The bright area facula that forms on the screen of alighting covers imaging measurement device's pixel measurement area, can guarantee in the field of view of being surveyed, and every pixel on the area array detector can both receive comparatively unanimous and sufficient light stimulation to can comparatively accurately obtain the calibration of every pixel. The sufficiently uniform light distribution in the bright-field light spots further ensures tolerances with respect to the alignment of the reference light source, i.e. even if there is an angular deviation from the alignment of the reference light source, the resulting alignment error is very small, since the light spots generated by the reference light source on the collimation screen are sufficiently uniform. In some cases, the light spot formed by the light directly emitted by the reference light source cannot completely cover the measurement field area of the imaging measurement device at one time, and a scanning splicing method can be adopted, so that the bright area light spot range completely covers the measurement field.
Further, an optical detector is used for measuring the illuminance or spectral irradiance of two or more positions on the surface of the collimation screen, and the spatial light intensity distribution of the reference light source is obtained by using the illuminance or spectral irradiance values measured at the positions, so that the imaging measuring device is calibrated; or the measured value of the imaging measuring device is corrected by using the illuminance or spectral irradiance measured at the positions, so that the accuracy of the light distribution test result is further ensured.
Furthermore, the reference light source is arranged in the light distribution measuring system, the installation positions of the reference light source and the lamp to be measured are different, and the light distribution test of the lamp can be carried out after the light distribution measuring system is calibrated by adopting the reference light source.
The invention also provides a lamp light distribution measuring system which comprises a sample stage, a collimation screen with a neutral diffuse reflection characteristic, an imaging measuring device with an array detector and reference light sources with two or more light output intensities, wherein the imaging measuring device is calibrated by the reference light sources with different intensities, so that the linear error of the imaging measuring device can be reduced, and the whole light distribution measuring system is effectively calibrated to ensure the accuracy of subsequent lamp measurement. Specifically, a light outlet of a reference light source is aligned to the collimation screen, the light output of the reference light source is adjusted, the reference light source emits light with various intensities to irradiate the collimation screen, and light spots are formed on the collimation screen; the imaging measurement device is aligned with light spots formed on the collimation screen, each point in the light spots corresponds to a pixel of an array detector in the imaging measurement device, and the response values of each pixel of the array detector under different intensities can be calibrated by knowing the spatial light intensity distribution of the reference light source under each intensity, so that the calibration of the light distribution measurement system is completed; and then arranging the lamp to be measured on the sample table, irradiating the light beam of the lamp to be measured on the collimation screen, aligning and measuring the collimation screen by the imaging measuring device, and measuring the space light distribution parameters of the lamp to be measured. The reference light source can be fixedly arranged below the sample table or above the sample table close to the position of the imaging measurement device. According to the technical scheme, the light intensity distribution and the illumination distribution are linked, the illumination is directly calibrated, the light distribution parameters of various lamps can be directly measured through the calibrated light distribution measuring system without conversion of brightness, the measuring process is simplified, and the accuracy and consistency of the measuring result can be ensured.
Furthermore, one or more movable or detachable optical detectors are arranged near the surface of the collimation screen, the light receiving surface of each optical detector is parallel to the collimation screen, the illumination or spectral irradiance on the surface of the collimation screen can be obtained by measuring through the optical detectors, the spatial light intensity distribution under each intensity of the reference light source is obtained through formula conversion, the measurement value of the light distribution measurement system can be corrected through the illumination or spectral irradiance value measured through the optical detectors, and the accuracy of the light distribution test result is further ensured.
Furthermore, the optical detector is an illumination probe or a spectral irradiance meter with cosine response correction, and calibration data is calculated according to a cosine relation, so that the accuracy of a light distribution test result is further ensured.
Further, the reference light source is composed of two or more colors of LEDs or OLEDs.
The invention has the beneficial effects that: the invention provides a lamp light distribution test method and a corresponding light distribution measurement system, which are used for calibrating the light distribution measurement system by adopting reference light sources with different intensities and colors, are further suitable for light distribution tests of different lamps, are convenient to operate and low in cost, and can ensure the consistency and accuracy of measurement results.
Drawings
Fig. 1 is a schematic view of a light distribution testing method of a lamp according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a light distribution measurement system of a lamp according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a light distribution measuring system of a lamp according to an embodiment of the present invention;
in the figure: 1. the device comprises a sample table, 2, an aiming screen, 3, an imaging measuring device, 4, a reference light source, 5, a lamp to be measured, 6 and an optical detector.
Detailed Description
The following description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but it should be understood by those skilled in the art that the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the following embodiments without departing from the scope and spirit of the invention. The scope of protection of the invention is defined by the appended claims.
The invention discloses a lamp light distribution test method which comprises a light distribution measurement system consisting of a sample table (1), a collimation screen (2) with a neutral diffuse reflection characteristic and an imaging measurement device (3) with an array detector, and is shown in figure 1. The method comprises the steps of preparing a test environment, sequentially placing a sample table (1), an aiming screen (2), an imaging measuring device (3) and a reference light source (4), firstly calibrating the light distribution measuring system by using the reference light source (4), and then measuring the light distribution of a measured lamp (5) by using the calibrated light distribution measuring system. The specific process is as follows: the reference light source (4) has light output of two or more different intensities and colors, under the light output of various intensities and colors, light emitted by the reference light source (4) is irradiated onto the collimation screen (2), the imaging measurement device (3) aligns and measures light spots formed by the reference light source (4) on the collimation screen (2), each point in the light spots of the collimation screen (2) corresponds to a pixel of an array detector in the imaging measurement device (3), the spatial light intensity distribution of the reference light source (4) under various intensities and colors is known, and the illumination distribution E (x, y) generated by the reference light source (4) on the collimation screen (2) is calculated according to the spatial position and the illumination angle of the center of a light outlet of the reference light source (4) relative to the collimation screen (2), wherein (x, y) are position coordinates of each point in the plane of the collimation screen (2); the calibration coefficient k (i, j) of each pixel point (i, j) in the imaging measuring device (3) is the response value M (i, j) of the pixel point and the plane position point of the collimation screen (2) corresponding to the pixel point
Ratio of the illuminance, i.e.
Then the response values of the pixels of the array detector under different intensities and colors are calibrated. Then the calibrated light distribution measuring system is used for measuring and obtaining the space light split of the measured lamp (5)And (3) distributing parameters, wherein light beams of the lamp (5) to be measured irradiate the collimation screen (2), and the imaging measuring device (3) is aligned to the collimation screen (2) and measures light spot information on the collimation screen (2).
Preferably, the light spot area formed by the reference light source (4) on the collimation screen (2) covers the pixel measurement area of the imaging measurement device (3).
Preferably, the optical detector (6) is used for measuring the illuminance or spectral irradiance at two or more positions on the surface of the collimation screen (2), and the measured value of the imaging measuring device (3) is corrected by using the illuminance or spectral irradiance value measured at the positions, so that the accuracy of the light distribution test result is further ensured.
Preferably, the reference light source (4) is built in the light distribution measuring system, the installation positions of the reference light source (4) and the lamp (5) to be measured are different, and the light distribution test of the lamp can be performed after the light distribution measuring system is calibrated by the reference light source (4).
The invention discloses a light distribution measuring system of a lamp, which comprises a sample table (1), a collimation screen (2) with neutral diffuse reflection characteristics, an imaging measuring device (3) with an array detector and a reference light source (4) with two or more light output intensities, wherein the collimation screen is arranged on the sample table and is used for measuring the light distribution of the lamp; a light outlet of the reference light source (4) is aligned to the collimation screen (2), the tested lamp (5) is arranged on the sample table (1), the light beam of the tested lamp (5) irradiates the collimation screen (2), and the imaging measuring device (3) is aligned to and measures the collimation screen (2); the reference light source (4) is fixedly arranged above the sample table (1). 4 detachable optical detectors (6) are arranged near the surface of the collimation screen (2), the light receiving surface of each optical detector (6) is parallel to the collimation screen (2), and the measured value of the light distribution measuring system is corrected through the illuminance or spectral radiance value measured by the optical detectors (6).
Preferably, the optical detector (6) is an illumination probe or a spectral irradiance meter with cosine response correction, and calibration data is calculated according to a cosine relation, so that the accuracy of a light distribution test result is further ensured.
Preferably, the reference light source (4) is composed of two or more colors of LEDs or OLEDs.
The invention also discloses another lamp light distribution measuring system, and the test environment is a darkroom by the lamp light distribution testing method in the technical scheme, and the light distribution of the vehicle lamp is measured after the light distribution measuring system is calibrated by using the reference light source. As shown in fig. 3, the vehicle is parked on the sample table (1), the lamp (5) to be tested of the vehicle is aligned to the collimation screen (2), and the light beam of the lamp (5) to be tested is irradiated on the collimation screen (2); an imaging measuring device (3) with an array detector is arranged on the roof and is aligned with and measures the collimation screen (2); 4 detachable optical detectors (6) are arranged near the surface of the collimation screen (2), the light receiving surface of each optical detector (6) is parallel to the collimation screen (2), and the measured value of the light distribution measuring system is corrected through the illuminance or spectral radiance value measured by the optical detectors (6).
Claims (10)
1. A light distribution test method of a lamp is characterized by comprising a light distribution measurement system consisting of a sample stage, a collimation screen with a neutral diffuse reflection characteristic and an imaging measurement device with an array detector, wherein a light beam of a lamp to be measured irradiates the collimation screen, and the imaging measurement device is aligned with the collimation screen and measures light spot information on the collimation screen; and calibrating the light distribution measuring system by adopting a reference light source, wherein the specific process is as follows: the reference light source has two or more light outputs with different intensities, light emitted by the reference light source is irradiated on the collimation screen under the light outputs with various intensities, the imaging measurement device aligns and measures light spots formed by the reference light source on the collimation screen, each point in the light spots of the collimation screen corresponds to a pixel of an array detector in the imaging measurement device, the spatial light intensity distribution of the reference light source under each intensity is known, and the response value of each pixel of the array detector under different intensities is calibrated; and measuring by the calibrated light distribution measuring system to obtain the space light distribution parameters of the lamp to be measured.
2. The method for testing light distribution of a lamp as claimed in claim 1, wherein the reference light source further has two or more different colors, and the reference light source is used to calibrate the light distribution measuring system at light outputs of respective colors and intensities.
3. The light distribution test method of the lamp according to claim 1 or 2, wherein the illuminance distribution E (x, y) generated by the reference light source on the collimation screen is calculated according to the space light intensity distribution of the reference light source, the space position of the center of the light outlet of the reference light source relative to the collimation screen and the irradiation angle, wherein (x, y) is the position coordinate of each point in the plane of the collimation screen; the calibration coefficient k (i, j) of each pixel point (i, j) in the imaging measurement device is the response value M (i, j) of the pixel point and the position point of the collimation screen plane corresponding to the pixel
Ratio of the illuminance, i.e.
。
4. The light distribution test method of the lamp according to claim 1 or 2, wherein the illuminance or spectral irradiance at two or more positions on the surface of the aiming screen is measured by using an optical detector; the space light intensity distribution of the reference light source is obtained by utilizing the illuminance or the spectrum illuminance value measured at the positions, so that the imaging measuring device is calibrated; or the measured values of the imaging measuring device are corrected by using the illuminance or spectral irradiance values measured at these positions.
5. The light distribution test method of the lamp according to claim 1 or 2, wherein a bright area light spot formed by the reference light source on the aiming screen covers a pixel measurement area of the imaging measurement device.
6. A lamp light distribution test method as claimed in claim 1, wherein the reference light source is built in the light distribution measurement system, and the mounting positions of the reference light source and the lamp to be tested are different.
7. A light distribution measuring system of a lamp is characterized by comprising a sample stage, an aiming screen with neutral diffuse reflection characteristics, an imaging measuring device with an array detector and a reference light source with two or more light output intensities; the light outlet of the reference light source is aligned to the collimation screen, the lamp to be tested is arranged on the sample table, the light beam of the lamp to be tested irradiates on the collimation screen, and the imaging measuring device is aligned to and measures the collimation screen; the reference light source is fixedly arranged below the sample table or above the sample table and close to the position of the imaging measurement device.
8. The light distribution measurement system of claim 7, wherein one or more removable or detachable optical detectors are mounted near the surface of the collimation screen, and the light receiving surface of the optical detector is parallel to the collimation screen.
9. A light distribution measuring system of a lamp as claimed in claim 8, wherein the optical detector is an illuminance probe or a spectral irradiance meter with cosine response correction.
10. The light distribution test system of claim 7, wherein the reference light source is composed of two or more color LEDs or OLEDs.
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| CN213021948U (en) * | 2020-09-09 | 2021-04-20 | 浙江省医疗器械检验研究院 | Photometric measurement device applied to distribution photometer |
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