Brightness meter calibration device and calibration method

Abstract

The embodiment of the invention provides a brightness meter calibration device and calibration method, and belongs to the technical field of optical detection equipment calibration. The calibration device comprises a calibration platform used for installing a calibrated brightness meter; the light source unit is arranged on the calibration platform, the light source unit is provided with a light output port, the light output port is aligned with the calibrated brightness meter, and a preset distance is reserved between the light output port and the calibrated brightness meter; the control unit is respectively connected with the light source unit and the calibrated brightness meter; the control unit is used for controlling the light source unit to emit light with a standard brightness value, and the calibrated brightness meter is used for receiving light passing through the light output port and obtaining a measured brightness value; and the control unit is used for acquiring the measured brightness value and executing brightness calibration aiming at the calibrated brightness meter according to the difference between the measured brightness value and the standard brightness value. According to the embodiment of the invention, full-automatic and high-precision brightness meter calibration can be realized, and the calibration efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical detection equipment calibration, and in particular to a luminance meter calibration device and calibration method. Background Art

[0002] A luminance meter is an instrument used to measure the brightness of a light source or the surface of an illuminated object. It is widely used in lighting engineering, display manufacturing, and automobile manufacturing. To ensure the accuracy and reliability of the measured data, the luminance meter needs to be calibrated regularly. However, the existing luminance meter calibration relies on manual operation, which has problems such as low calibration efficiency and large human error.

[0003] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention

[0004] The embodiments of the present application provide a luminance meter calibration device and a calibration method to solve or alleviate one or more of the technical problems mentioned above.

[0005] As one aspect of an embodiment of the present application, an embodiment of the present application provides a calibrating device for a brightness meter, including: Calibration platform, used to install the calibrated luminance meter; A light source unit is disposed on the calibration platform, the light source unit has a light output port, the light output port is aligned with the calibrated brightness meter and is spaced a preset distance from the calibrated brightness meter; A control unit, connected to the light source unit and the calibrated brightness meter respectively; The control unit is used to control the light source unit to emit light of a standard brightness value, and the calibrated brightness meter is used to receive light passing through the light output port and obtain a measured brightness value; the control unit is also used to obtain the measured brightness value and perform brightness calibration for the calibrated brightness meter based on the difference between the measured brightness value and the standard brightness value.

[0006] Optionally, the device further comprises a filter unit, which is movably disposed at the light output port; the filter unit is connected to a first motor, which is connected to the control unit, and the control unit drives the filter unit to be disposed at the light output port by controlling the first motor; When the filter unit is placed at the light output port, the filter unit is used to filter the light passing through the light output port to obtain monochromatic light with a standard chromaticity value; the calibrated luminance meter is used to receive the monochromatic light and obtain a measured chromaticity value; the control unit is also used to obtain the measured chromaticity value and perform chromaticity calibration for the calibrated luminance meter according to the difference between the measured chromaticity value and the standard chromaticity value.

[0007] Optionally, the filter unit comprises a rotating bracket and a plurality of standard transmission color plates, the rotating bracket is provided with a plurality of terminals, the plurality of standard transmission color plates are mounted on the plurality of terminals in a one-to-one correspondence, and the plurality of standard transmission color plates correspond to different chromaticity values; Correspondingly, the control unit drives the filter unit to be placed at the light output port by controlling the first motor, including: The control unit drives the rotating bracket to rotate by controlling the first motor until the target standard transmission color plate is aligned with the light output port; Wherein, the target standard transmission color plate is a standard transmission color plate having the same chromaticity value as the standard chromaticity value.

[0008] Optionally, the light source unit comprises a light source, an integrating sphere, an aperture and a standard brightness meter, wherein the aperture is arranged between the light source and the integrating sphere, and the standard brightness meter extends into the integrating sphere; The diaphragm is connected to one end of a transmission unit, the other end of the transmission unit is connected to a second motor, the second motor is connected to the control unit, the control unit is used to control the second motor to drive the transmission unit, and the transmission unit is used to adjust the aperture of the diaphragm; The light source is connected to a power source, the power source is connected to the control unit, the control unit starts the light source by controlling the power source, and the light emitted by the light source enters the integrating sphere through the aperture of the diaphragm; The standard brightness meter is connected to the control unit, and the control unit monitors the brightness value of the integrating sphere through the standard brightness meter until the brightness value is the same as the standard brightness value.

[0009] Optionally, the calibrated brightness meter includes a light receiving surface, the light receiving surface of the calibrated brightness meter is adjusted to be perpendicular to the optical axis direction of the light output port, and the horizontal distance between the calibrated brightness meter and the light output port is adjusted to the preset distance; The imaging of the light output port is located within the field of view of the calibrated luminance meter, and the imaging clarity is higher than a preset threshold, and the center of the light output port is aligned with the center of the field of view.

[0010] As another aspect of an embodiment of the present application, an embodiment of the present application provides a calibration method for a brightness meter based on a calibration device, wherein the calibration device is used to install a brightness meter to be calibrated, and the calibration device includes a light source unit and a control unit, wherein the light source unit has a light output port, the light output port is aligned with the brightness meter to be calibrated and is spaced a preset distance from the brightness meter to be calibrated, and the control unit is respectively connected to the light source unit and the brightness meter to be calibrated; the brightness meter calibration method includes: The control unit controls the light source unit to emit light of a standard brightness value, and the light is received by the calibrated brightness meter through the light output port; Acquiring the measured brightness value of the calibrated brightness meter through the control unit; The control unit performs brightness calibration for the calibrated brightness meter according to the difference between the measured brightness value and the standard brightness value.

[0011] Optionally, the calibration device further comprises a filter unit, which is movably disposed at the light output port; the filter unit is connected to a first motor, and the first motor is connected to the control unit; Correspondingly, the brightness meter calibration method also includes: The control unit controls the first motor to drive the filter unit to be placed at the light output port; The control unit controls the light source unit to emit light of a preset brightness value, and the light enters the filter unit after passing through the light output port, and is filtered by the filter unit to obtain monochromatic light in a standard chromaticity value, and the monochromatic light is received by the calibrated brightness meter; Acquiring the measured chromaticity value of the calibrated luminance meter through the control unit; The control unit performs chromaticity calibration for the calibrated luminance meter according to the difference between the measured chromaticity value and the standard chromaticity value.

[0012] Optionally, the filter unit comprises a rotating bracket and a plurality of standard transmission color plates, the rotating bracket is provided with a plurality of terminals, the plurality of standard transmission color plates are mounted on the plurality of terminals in a one-to-one correspondence, and the plurality of standard transmission color plates correspond to different chromaticity values; Correspondingly, the control unit controls the first motor to drive the filter unit to be placed at the light output port, including: The control unit controls the first motor to drive the rotating bracket to rotate until the target standard transmission color plate is aligned with the light output port; Wherein, the target standard transmission color plate is a standard transmission color plate having the same chromaticity value as the standard chromaticity value.

[0013] Optionally, the light source unit includes a light source, an integrating sphere, an aperture and a standard brightness meter, wherein the aperture is arranged between the light source and the integrating sphere, and the standard brightness meter extends into the integrating sphere; the light source is connected to a power source, which is connected to the control unit, the aperture is connected to a second motor via a transmission unit, and the second motor is connected to the control unit; Correspondingly, controlling the light source unit to emit light of a standard brightness value includes: Controlling the second motor to drive the transmission unit through the control unit, wherein the transmission unit is used to adjust the aperture of the diaphragm; The control unit controls the power supply to start the light source, and the light emitted by the light source enters the integrating sphere through the aperture of the diaphragm; The brightness value of the integrating sphere measured by the standard brightness meter is monitored by the control unit until the brightness value is the same as the standard brightness value.

[0014] Optionally, the calibrated luminance meter includes a light receiving surface, the calibration device further includes a calibration platform, and the light source unit is arranged on the calibration platform; the calibrated luminance meter is installed in the calibration device by the following operations: Placing the calibrated luminance meter on the calibration platform; The light receiving surface of the calibrated brightness meter is adjusted to be perpendicular to the optical axis direction of the light output port, and the horizontal distance between the calibrated brightness meter and the light output port is adjusted to the preset distance, thereby completing the installation of the calibrated brightness meter; The imaging of the light output port is located within the field of view of the installed calibrated luminance meter, and the imaging clarity is higher than a preset threshold, and the center of the light output port is aligned with the center of the field of view.

[0015] The above technical solution adopted in the embodiment of the present application may have the following advantages: The calibration device provides a calibration platform, a light source unit and a control unit, wherein the light source unit has a light output port, the calibration platform is used to install the calibrated luminance meter, the installed calibrated luminance meter is aligned with the light output port and spaced by a preset distance, and the control unit is connected to the light source unit and the calibrated luminance meter respectively. The control unit is used to control the light source unit to emit light of a standard brightness value, and the light is received by the calibrated luminance meter after passing through the light output port to obtain a measured brightness value. The control unit obtains the measured brightness value and performs brightness calibration for the calibrated luminance meter according to the difference between the standard brightness value and the measured brightness value. It can be seen that the calibration device provided in the embodiment of the present application can realize fully automatic and high-precision calibration of the luminance meter, greatly improving the calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0017] Figure 1 is a schematic diagram of a luminance meter calibration device provided in an embodiment of the present application.

[0018] Description of reference numerals: Light source unit 1 Control unit 2 Calibrated luminance meter 3 DETAILED DESCRIPTION In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] The following provides an explanation of the terms used in this application.

[0021] PLC (Programmable Logic Controller): A programmable logic controller that can implement functions such as logic control, sequence control, timing, counting and arithmetic operations through programming.

[0022] RS485: A serial communication protocol.

[0023] RS232: A serial communication protocol.

[0024] Ethernet: A local area network (LAN) technology.

[0025] cd / m 2 : Candela per square meter is a unit of brightness used to indicate the light intensity per unit area.

[0026] To facilitate those skilled in the art to understand the technical solutions provided in the embodiments of the present application, the relevant technologies are described below: A luminance meter is an instrument used to measure the brightness of a light source or the surface of an illuminated object. It is widely used in lighting engineering, display manufacturing, and automobile manufacturing. To ensure the accuracy and reliability of the measurement data, the luminance meter needs to be calibrated regularly.

[0027] However, the applicant has learned that the relevant brightness meter calibration scheme mainly relies on manual operation, which requires the operator to manually adjust the brightness of the standard light source after aligning the brightness meter with the light outlet of the standard light source, while measuring with the brightness meter, recording the data and performing calculation analysis. This process is not only time-consuming and laborious, but also affected by the operator's skill level and operating habits, which may lead to inconsistent calibration results.

[0028] To this end, the embodiments of the present application provide a calibration device and calibration scheme for a brightness meter: (1) The calibration device greatly shortens the calibration time of the brightness meter through automated control and data acquisition processing procedures. Compared with the manual calibration scheme, the calibration efficiency can be improved several times. (2) Through high-precision control of the light source unit, the size of the standard brightness value is automatically adjusted, reducing the impact of human factors on the calibration process, and improving the accuracy and reliability of calibration. (3) The control unit can also provide a visual software interface, and the operator can perform simple parameter settings and issue operation instructions on the software interface to complete the entire calibration process. There is no need for complex manual operation steps, the operation is simple, and the skill requirements for the operator can be reduced. (4) The hardware structure and software system design of the calibration device have good scalability, which is convenient for adding new light source units or functional modules, and can adapt to the calibration needs of brightness meters of different types and different accuracy requirements. See below for details.

[0029] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.

[0030] like Figure 1 As shown, the calibration device may include: a calibration platform (not shown), a light source unit 1 and a control unit 2. The calibration platform may be used to install a luminance meter 3 to be calibrated, which is a luminance meter to be calibrated.

[0031] The respective structures and coordination relationship of the light source unit 1 and the control unit 2 will be introduced below.

[0032] The light source unit 1 can be arranged on the calibration platform by means of a mounting bracket. The light source unit 1 can be provided with a light output port, which is aligned with the installed calibrated brightness meter and maintains a preset distance to ensure that the light emitted by the light source unit 1 can be received by the calibrated brightness meter 3 after passing through the light output port to obtain a measured brightness value.

[0033] The control unit 2 can be connected to the light source unit 1 and the calibrated luminance meter 3 respectively.

[0034] The control unit 2 can be used as the core component of the entire calibration device, which can be used to control the operation of each component and is responsible for data acquisition and processing. The control unit 2 can be combined with a computer and a PLC, wherein the computer can provide a software interface, through which the operator can set calibration parameters, start the calibration process, view calibration results, etc. After setting the calibration parameters, the control unit 2 can automatically execute the calibration process, for example: record the standard brightness value and the standard chromaticity value, obtain the measured brightness value and the measured chromaticity value of the calibrated luminance meter, etc. The computer can be used to control the brightness adjustment of the light source unit 1, the data acquisition trigger of the data acquisition and processing unit, and the PLC can be used to control the movement of the motor. The control unit 2 can realize the communication connection between the components through communication interfaces such as Ethernet and RS485 to ensure the coordination and stability of the entire calibration process. For example, the computer can establish a communication connection with the light source unit 1 and the calibrated luminance meter 3 through USB. Thus, the control unit 2 can control the light source unit 1 to emit light of a standard brightness value. Among them, the standard brightness value can correspond to a pre-set brightness calibration point, such as 1000cd / m 2 , 5000cd / m 2 、10000cd / m 2 The control unit 2 can control the light source unit 1 to emit light of different standard brightness values, thereby realizing point-by-point calibration of the calibrated brightness meter. The control unit 2 can also read the measured brightness value of the calibrated brightness meter 3, and perform brightness calibration for the calibrated brightness meter 3 according to the difference between the measured brightness value and the standard brightness value.

[0035] For example, the control unit 2 can control the light source unit 1 to emit a standard brightness value of 1000 cd / m 2 The light passes through the light output port and is received by the calibrated brightness meter 3, and the measured brightness value is obtained, such as 1005cd / m 2 The control unit 2 can read the measured brightness value in real time by establishing a communication connection with the calibrated brightness meter 3, and calculate the error between the measured brightness value and the standard brightness value (5cd / m 2 The error is compared with the preset brightness error range (such as 0~10cd / m 2 ) is compared. If the error is within the brightness error range, it can be judged that the calibration is successful, and a calibration report is generated and pushed to relevant personnel. If it exceeds the brightness error range, calibration can be performed according to the actual situation or the calibration device can be checked for faults. The calibration process example is as follows: the control unit 2 can generate a brightness calibration file according to the error, and then perform brightness calibration on the calibrated brightness meter 3 based on the brightness calibration file.

[0036] In this embodiment, the control unit 2 can automatically adjust the light source unit 1 to emit light of different standard brightness values, and correspondingly collect the measured brightness value of the calibrated brightness meter 3. The control unit 2 can automatically calibrate the calibrated brightness meter 3 based on the difference between the standard brightness value and the measured brightness value. It can be seen that the calibration device provided in this embodiment can realize fully automatic and high-precision brightness meter calibration, reduce the influence of human factors, and improve calibration efficiency and accuracy.

[0037] The above embodiment introduces the core components of the calibration device: light source unit 1 and control unit 2, which can realize the full-automatic brightness calibration of the brightness meter through cooperation. The internal structure of the core component and its cooperation relationship with other components will be further described below.

[0038] In an optional embodiment, the calibration device may further include a filter unit (not fully shown in the figure), which may be movably placed at the light output port. That is, the filter unit may be placed at the light output port to filter the light passing through the light output port. The filter unit may also be far away from the light output port so as not to affect the light passing through the light output port. The filter unit may be connected to the first motor. The PLC may be connected to the first motor via a communication line. In this way, the control unit 2 may drive the filter unit to move to the light output port by controlling the first motor. When the filter unit is placed at the light output port, the light passing through the light output port may be filtered to obtain monochromatic light with a standard chromaticity value. The standard chromaticity value may be green, red, purple, yellow, orange, blue, etc. The filter unit may adjust the standard chromaticity value according to the calibration requirements to achieve calibration of each color of the calibrated brightness meter. The calibrated brightness meter 3 may receive monochromatic light to obtain a measured chromaticity value. The control unit 2 may also obtain the measured chromaticity value, calculate the difference between the measured chromaticity value and the standard chromaticity value, and perform chromaticity calibration for the calibrated brightness meter 3 according to the difference.

[0039] For example, the control unit 2 can control the light source unit 1 to emit a preset brightness value (such as 500 cd / m 2) and controls the first motor to drive the filter unit to be positioned at the light output port. The light enters the filter unit through the light output port, and the filter unit filters the light into monochromatic light with standard chromaticity value (such as green light, color coordinates x=0.4175, y=0.4549). The calibrated brightness meter 3 receives the monochromatic light and obtains the measured chromaticity value (such as color coordinates x=0.4166, y=0.4554). The control unit 2 can read the measured chromaticity value in real time by establishing a communication connection with the calibrated brightness meter 3, and calculate the error between the measured chromaticity value and the standard chromaticity value. The error is compared with the preset chromaticity error range. If the error is within the chromaticity error range, it can be judged that the calibration is successful, and a calibration report is generated and pushed to relevant personnel. If the chromaticity error range is exceeded, calibration can be performed according to the actual situation or the calibration device can be checked for faults. An example of the calibration process is as follows: the control unit 2 can generate a chromaticity calibration file according to the error, and then perform chromaticity calibration on the calibrated brightness meter 3 based on the chromaticity calibration file.

[0040] In this embodiment, the control unit 2 can automatically adjust the standard chromaticity value output by the filter unit, and correspondingly collect the measured chromaticity value of the calibrated luminance meter 3. The control unit 2 can automatically calibrate the calibrated luminance meter 3 based on the difference between the standard chromaticity value and the measured chromaticity value. It can be seen that the calibration device provided in this embodiment can further optimize the comprehensiveness and accuracy of the luminance meter calibration through the filter unit.

[0041] In an optional embodiment, the filter unit may include a rotating bracket and a plurality of standard transmission color plates (such as Figure 1 As shown). The rotating bracket may be provided with a plurality of terminals, and a plurality of standard transmission color plates may be mounted on the plurality of terminals one by one, and the plurality of standard transmission color plates correspond to different chromaticity values, including green, red, purple, yellow, orange, blue, etc. Exemplarily, the rotating bracket may be in the shape of a Ferris wheel or a disc. Correspondingly, the control unit 2 may control the first motor to drive the rotating bracket to rotate until the target standard transmission color plate is placed at the light output port. The target standard transmission color plate may be a standard transmission color plate having the same chromaticity value as the standard chromaticity value.

[0042] For example, the control unit 2 can control the first motor to drive the rotating bracket, and the rotating bracket rotates the standard transmission color plates of different colors to the light output port in turn. The control unit 2 correspondingly collects the measured brightness value of the calibrated brightness meter 3. Based on the difference between the standard chromaticity value and the measured chromaticity value, the control unit 2 can automatically complete the chromaticity calibration of the calibrated brightness meter 3.

[0043] In this embodiment, by providing a rotating bracket and a plurality of standard transmission color plates, the control unit 2 can automatically adjust the standard chromaticity value of the filter unit according to actual needs, thereby completing the chromaticity calibration of the luminance meter, further improving the flexibility and comprehensiveness of the calibration.

[0044] In an optional embodiment, if Figure 1 As shown, the light source unit 1 may include a light source, an integrating sphere, an aperture and a standard brightness meter. The light source can be connected to a power source. The power source can be connected to the control unit 2 via an RS232 serial port line. The control unit 2 can start the light source by controlling the power source.

[0045] The diaphragm may be provided with an aperture and an adjustment component. The diaphragm may be arranged between the light source and the integrating sphere. The light emitted by the light source may enter the integrating sphere through the aperture of the diaphragm. The integrating sphere may evenly distribute the light emitted by the light source, and the uniformity of the light through the light output port may reach more than 98%, thereby improving the calibration reliability of the luminance meter. The adjustment component of the diaphragm may be connected to a transmission unit (also called a coupling), and the transmission unit may be connected to a second motor. The PLC in the control unit 2 may be connected to the second motor through a communication line. In this way, the control unit 2 may control the second motor to drive the transmission unit to adjust the adjustment component, thereby changing the size of the diaphragm aperture, and finally adjusting the luminous flux entering the integrating sphere.

[0046] The standard brightness meter can be inserted into the integrating sphere to measure the brightness value of the integrating sphere (actual output brightness) in real time and feed the data back to the control unit 2. Combining the transmission unit and the standard brightness meter can ensure that the light source unit 1 finally outputs light of the standard brightness value, ensuring the stability and accuracy of the output of the light source unit 1.

[0047] For example, the control unit 2 can start the light source through the power supply, and control the second motor to drive the transmission unit to adjust the aperture size of the diaphragm. The light emitted by the light source enters the integrating sphere through the diaphragm aperture, and the standard brightness meter can measure the brightness value of the integrating sphere. The computer in the control unit 2 can be connected to the standard brightness meter through a USB to obtain the brightness value of the integrating sphere in real time. When the brightness value of the integrating sphere is equal to the standard brightness value, the operation of the first motor can be stopped.

[0048] In this embodiment, the control unit controls the second motor, the transmission unit, the standard brightness meter and other components to cooperate with each other with high precision, thereby ensuring the accuracy of the light source unit 1, reducing errors in the calibration process, and further improving the calibration accuracy.

[0049] In an optional embodiment, the calibrated luminance meter 3 may include a light receiving surface, which can be adjusted to be perpendicular to the optical axis direction of the light output port, and the calibrated luminance meter as a whole can be adjusted to maintain a preset distance from the light output port to ensure that the light output port can be clearly imaged within the field of view of the calibrated luminance meter, and the center of the light output port is aligned with the center of the field of view.

[0050] In this embodiment, the installation position of the calibrated luminance meter is set based on the light output port, which can ensure the rationality of lighting, reduce measurement errors, and further improve calibration accuracy.

[0051] Combine the following Figure 1 The calibration device provided in the embodiment of the present application is described in general.

[0052] like Figure 1 As shown, the calibration device may include a light source unit 1, a control unit 2, and a calibration platform (not shown). The calibration platform is used to install the luminance meter to be calibrated.

[0053] The light source unit 1 may include a mounting bracket, an integrating sphere, a light source, an aperture, and a standard luminance meter. The integrating sphere may be fixed on the calibration platform by means of a mounting bracket. The light source may be placed on the integrating sphere, and an aperture may be provided between the light source and the integrating sphere. The light source may be connected to a power source, and the power source is used to supply power to the light source to emit light. The aperture may be provided with an aperture and an adjustment component, and the adjustment component may be connected to one end of a transmission unit (also called a coupling), and the other end of the transmission unit may be connected to a second motor. The second motor may be fixed to the mounting bracket, and is used to drive the transmission unit to adjust the adjustment unit, thereby adjusting the aperture of the aperture, and further adjusting the luminous flux entering the integrating sphere. The standard luminance meter may be inserted into the integrating sphere to measure the brightness value of the integrating sphere. The integrating sphere also has a light output port, and the light is received by the calibrated luminance meter after passing through the light output port.

[0054] The control unit 2 may include a computer and a PLC, wherein the computer is connected to the PLC via a network cable, connected to a power source via an RS232 serial port cable, connected to a standard brightness meter and a brightness meter to be calibrated via a USB, and the PLC is connected to the first motor and the second motor via a communication line.

[0055] The filter unit is movably placed at the light output port. It may include a rotating bracket and a plurality of standard transmission color plates corresponding to different chromaticity values. The plurality of standard transmission color plates are mounted on a plurality of terminals of the rotating bracket in a one-to-one correspondence. The rotating bracket is provided with a second motor, which is used to drive the rotating bracket. The rotating bracket can sequentially place different standard transmission color plates at the light output port by rotating to output different standard chromaticity values.

[0056] The luminance meter calibration device provided in the embodiment of the present application can achieve (10~30000) cd / m 2 The automatic calibration is simple to operate, highly accurate and low cost. Specifically, through a high-precision control unit and self-compiled algorithm software, the calibration device is automatically set and adjusted (the second motor is automatically controlled to make the transmission unit accurately control the aperture and the first motor is automatically controlled to make the rotating bracket rotate to move the specified standard transmission color plate to the light output port), so that it outputs standard brightness value and standard chromaticity value, realizes the automatic calibration of the calibrated brightness meter, and improves the calibration efficiency and accuracy.

[0057] The difference from the above embodiment is that the embodiment of the present application also provides a brightness meter calibration method based on the calibration device.

[0058] Before calibrating the luminance meter, the calibrated luminance meter may be installed on a calibration device, and the calibration device may be set. An exemplary solution is provided below.

[0059] In an optional embodiment, the calibrated luminance meter can be installed into the calibration device by following the steps below: Step S100: placing the calibrated luminance meter on the calibration platform.

[0060] Step S102, adjusting the light receiving surface of the calibrated luminance meter to be perpendicular to the optical axis direction of the light output port, and adjusting the horizontal distance between the calibrated luminance meter and the light output port to the preset distance, to complete the installation of the calibrated luminance meter. The image of the light output port is located within the field of view of the installed calibrated luminance meter, and the image clarity is higher than a preset threshold, and the center of the light output port is aligned with the center of the field of view.

[0061] For example, the calibrated luminance meter can be placed on the calibration platform, and then the light receiving surface can be adjusted to be perpendicular to the optical axis direction of the light output port, and the horizontal distance between the calibrated luminance meter and the light output port can be adjusted to keep a preset distance between the two, thus completing the installation of the calibrated luminance meter. Through the above installation steps, the light output port can be clearly imaged within the field of view of the calibrated luminance meter, and the center of the light output port is aligned with the center of the field of view.

[0062] In this embodiment, when installing the calibrated brightness meter, ensuring that it is accurately aligned with the light output port can improve measurement stability and calibration accuracy and reduce calibration failures caused by angle or distance deviations.

[0063] The computer in the control unit 2 may also provide a software interface, through which the operator may set the parameters required for calibration, such as the operating current value of the light source, the standard brightness value, the number of measurements, etc.

[0064] After the parameters of the control unit 2 are set, the control unit 2 can automatically start and execute the calibration process to perform brightness calibration and color calibration on the calibrated brightness meter 3. An exemplary solution is provided below.

[0065] In an optional embodiment, the brightness meter calibration method may include: Step S200: Control the light source unit to emit light of a standard brightness value through the control unit, and the light is received by the calibrated brightness meter through the light output port.

[0066] Step S202: obtaining the measured brightness value of the calibrated brightness meter through the control unit.

[0067] Step S204: performing brightness calibration for the calibrated brightness meter according to the difference between the measured brightness value and the standard brightness value by the control unit.

[0068] Among them, step S200 may include: controlling the second motor to drive the transmission unit through the control unit 2, and the transmission unit is used to adjust the aperture of the diaphragm; controlling the power supply to start the light source through the control unit 2, and the light emitted by the light source enters the integrating sphere through the aperture of the diaphragm; monitoring the brightness value of the integrating sphere measured by the standard brightness meter through the control unit 2 until the brightness value is the same as the standard brightness value.

[0069] Exemplarily, the control unit 2 can control the power supply to start the light source to emit light based on the set working current, and at the same time, can send instructions to the second motor to control the second motor to drive the transmission unit, adjust the adjustment component of the diaphragm through the transmission unit, thereby adjusting the aperture size of the diaphragm, and then adjusting the light entering the integrating sphere, that is, adjusting the light source unit 1 to output the light of the specified brightness value (standard brightness value). The control unit 2 collects the standard brightness value through the standard brightness meter, and collects the measured brightness value through the calibrated brightness meter 3. According to the difference between the two, if the error exceeds the preset brightness error range, a brightness calibration file for the calibrated brightness meter can be generated and brightness calibration can be performed. After completing the calibration of one of the specified brightness values, the above steps can be repeated by the control unit 2 to control the light source unit 1 to emit light of different standard brightness values ​​in turn according to the set brightness calibration points, thereby realizing the point-by-point calibration of the calibrated brightness meter. Of course, the control unit 2 can also first save the data collected at each brightness calibration point, and finally generate a brightness calibration file for the calibrated brightness meter based on the data collection and perform brightness calibration.

[0070] In this embodiment, automatic calibration is achieved through the control unit 2, which can accurately adjust the brightness of the light source unit, automatically collect standard brightness values ​​and measured brightness values, and generate a brightness calibration file, thereby efficiently and accurately completing the point-by-point calibration of the calibrated brightness meter, thereby improving the calibration efficiency and accuracy.

[0071] In an optional embodiment, the brightness meter calibration method may further include: Step S300: Control the first motor through the control unit to drive the filter unit to be placed at the light output port.

[0072] Step S302, the control unit controls the light source unit to emit light of a preset brightness value, the light passes through the light output port and enters the filter unit, and is filtered by the filter unit to obtain monochromatic light in a standard chromaticity value, and the monochromatic light is received by the calibrated luminance meter.

[0073] Step S304: obtaining the measured chromaticity value of the calibrated luminance meter through the control unit.

[0074] Step S306: The control unit performs chromaticity calibration for the calibrated luminance meter according to the difference between the measured chromaticity value and the standard chromaticity value.

[0075] Exemplarily, after completing the brightness calibration, the control unit 2 can send an instruction to the first motor, and the first motor can drive the filter unit to be placed at the light output port, filter the light passing through the light output port, and obtain monochromatic light of the specified chromaticity value (standard chromaticity value). At the same time, the control unit 2 can collect the measured chromaticity value through the calibrated brightness meter 3. According to the difference between the two, if the error exceeds the preset chromaticity error range, a chromaticity calibration file for the calibrated brightness meter can be generated and the chromaticity calibration can be performed. After completing the calibration of one of the specified chromaticity values, the above steps can be repeated by the control unit 2 to adjust the filter unit to output different standard chromaticity values, thereby realizing the chromaticity calibration of each chromaticity of the calibrated brightness meter. Of course, the control unit 2 can also first save the measurement data collected for each chromaticity value, and finally generate the chromaticity calibration file of the calibrated brightness meter based on the data collection and perform the chromaticity calibration.

[0076] In this embodiment, by controlling the filter unit through the control unit, monochromatic light with different standard chromaticity values ​​can be accurately generated, and a chromaticity calibration file is generated based on the difference between the standard chromaticity value and the measured chromaticity value, thereby achieving efficient and accurate chromaticity calibration and improving the chromaticity measurement accuracy and reliability of the luminance meter.

[0077] In an optional embodiment, step S300 may include: controlling the first motor through the control unit to drive the rotating bracket to rotate until the target standard transmittance color plate is aligned with the light output port; wherein the target standard transmittance color plate is a standard transmittance color plate having the same chromaticity value as the standard chromaticity value.

[0078] In this embodiment, the control unit 2 can send instructions to the first motor, and the first motor can drive the rotating bracket to rotate the standard transmission color plates of different colors to the light output port, and the computer software correspondingly collects the measured chromaticity value of the calibrated luminance meter.

[0079] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0080] For the convenience of description, the orientation or position relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0081] 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 a communication; 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 this application can be understood according to specific circumstances.

[0082] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0084] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0085] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0086] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A luminance meter calibration device, characterized in that: The device comprises: Calibration platform, used to install the calibrated luminance meter; A light source unit is disposed on the calibration platform, the light source unit has a light output port, the light output port is aligned with the calibrated brightness meter and is spaced a preset distance from the calibrated brightness meter; A control unit, connected to the light source unit and the calibrated brightness meter respectively; The control unit is used to control the light source unit to emit light of a standard brightness value, and the calibrated brightness meter is used to receive light passing through the light output port and obtain a measured brightness value; the control unit is also used to obtain the measured brightness value and perform brightness calibration for the calibrated brightness meter based on the difference between the measured brightness value and the standard brightness value.

2. The device according to claim 1, characterized in that The device further comprises a light filtering unit, which is movably placed at the light output port; the light filtering unit is connected to a first motor, which is connected to the control unit, and the control unit drives the light filtering unit to be placed at the light output port by controlling the first motor; When the filter unit is placed at the light output port, the filter unit is used to filter the light passing through the light output port to obtain monochromatic light with a standard chromaticity value, and the calibrated luminance meter is used to receive the monochromatic light and obtain a measured chromaticity value; the control unit is also used to obtain the measured chromaticity value, and perform chromaticity calibration for the calibrated luminance meter according to the difference between the measured chromaticity value and the standard chromaticity value.

3. The device according to claim 2, characterized in that The filter unit comprises a rotating bracket and a plurality of standard transmission color plates, the rotating bracket is provided with a plurality of terminals, the plurality of standard transmission color plates are mounted on the plurality of terminals in a one-to-one correspondence, and the plurality of standard transmission color plates correspond to different chromaticity values; Correspondingly, the control unit drives the filter unit to be placed at the light output port by controlling the first motor, including: The control unit drives the rotating bracket to rotate by controlling the first motor until the target standard transmission color plate is aligned with the light output port; Wherein, the target standard transmission color plate is a standard transmission color plate having the same chromaticity value as the standard chromaticity value.

4. The device according to claim 1, characterized in that The light source unit comprises a light source, an integrating sphere, an aperture and a standard brightness meter, wherein the aperture is arranged between the light source and the integrating sphere, and the standard brightness meter extends into the integrating sphere; The diaphragm is connected to one end of a transmission unit, the other end of the transmission unit is connected to a second motor, the second motor is connected to the control unit, the control unit is used to control the second motor to drive the transmission unit, and the transmission unit is used to adjust the aperture of the diaphragm; The light source is connected to a power source, the power source is connected to the control unit, the control unit starts the light source by controlling the power source, and the light emitted by the light source enters the integrating sphere through the aperture of the diaphragm; The standard brightness meter is connected to the control unit, and the control unit monitors the brightness value of the integrating sphere through the standard brightness meter until the brightness value is the same as the standard brightness value.

5. The device according to claim 1, characterized in that The calibrated brightness meter comprises a light receiving surface, the light receiving surface of the calibrated brightness meter is adjusted to be perpendicular to the optical axis direction of the light output port, and the horizontal distance between the calibrated brightness meter and the light output port is adjusted to the preset distance; The imaging of the light output port is located within the field of view of the calibrated luminance meter, and the imaging clarity is higher than a preset threshold, and the center of the light output port is aligned with the center of the field of view.

6. A luminance meter calibration method based on a calibration device, characterized in that: The calibration device is used to install the calibrated brightness meter, and the calibration device includes a light source unit and a control unit. The light source unit has a light output port, the light output port is aligned with the calibrated brightness meter and is separated from the calibrated brightness meter by a preset distance, and the control unit is respectively connected to the light source unit and the calibrated brightness meter; The brightness meter calibration method comprises: The control unit controls the light source unit to emit light of a standard brightness value, and the light is received by the calibrated brightness meter through the light output port; Acquiring the measured brightness value of the calibrated brightness meter through the control unit; The control unit performs brightness calibration for the calibrated brightness meter according to the difference between the measured brightness value and the standard brightness value.

7. The method according to claim 6, characterized in that The calibration device further comprises a filter unit, which is movably disposed at the light output port; the filter unit is connected to a first motor, which is connected to the control unit; Correspondingly, the brightness meter calibration method also includes: The control unit controls the first motor to drive the filter unit to be placed at the light output port; The control unit controls the light source unit to emit light of a preset brightness value, and the light enters the filter unit after passing through the light output port, and is filtered by the filter unit to obtain monochromatic light in a standard chromaticity value, and the monochromatic light is received by the calibrated brightness meter; Acquiring the measured chromaticity value of the calibrated luminance meter through the control unit; The control unit performs chromaticity calibration for the calibrated luminance meter according to the difference between the measured chromaticity value and the standard chromaticity value.

8. The method according to claim 7, characterized in that The filter unit comprises a rotating bracket and a plurality of standard transmission color plates, the rotating bracket is provided with a plurality of terminals, the plurality of standard transmission color plates are mounted on the plurality of terminals in a one-to-one correspondence, and the plurality of standard transmission color plates correspond to different chromaticity values; Correspondingly, the control unit controls the first motor to drive the filter unit to be placed at the light output port, including: The control unit controls the first motor to drive the rotating bracket to rotate until the target standard transmission color plate is aligned with the light output port; Wherein, the target standard transmission color plate is a standard transmission color plate having the same chromaticity value as the standard chromaticity value.

9. The method according to claim 6, characterized in that The light source unit comprises a light source, an integrating sphere, an aperture and a standard brightness meter, wherein the aperture is arranged between the light source and the integrating sphere, and the standard brightness meter extends into the integrating sphere; the light source is connected to a power source, which is connected to the control unit, the aperture is connected to a second motor via a transmission unit, and the second motor is connected to the control unit; Correspondingly, controlling the light source unit to emit light of a standard brightness value includes: Controlling the second motor to drive the transmission unit through the control unit, wherein the transmission unit is used to adjust the aperture of the diaphragm; The control unit controls the power supply to start the light source, and the light emitted by the light source enters the integrating sphere through the aperture of the diaphragm; The brightness value of the integrating sphere measured by the standard brightness meter is monitored by the control unit until the brightness value is the same as the standard brightness value.

10. The method according to claim 6, characterized in that The calibrated luminance meter includes a light receiving surface, the calibration device also includes a calibration platform, and the light source unit is arranged on the calibration platform; the calibrated luminance meter is installed in the calibration device through the following operations: Placing the calibrated luminance meter on the calibration platform; The light receiving surface of the calibrated brightness meter is adjusted to be perpendicular to the optical axis direction of the light output port, and the horizontal distance between the calibrated brightness meter and the light output port is adjusted to the preset distance, thereby completing the installation of the calibrated brightness meter; The imaging of the light output port is located within the field of view of the installed calibrated luminance meter, and the imaging clarity is higher than a preset threshold, and the center of the light output port is aligned with the center of the field of view.

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