WO2020114001A1 - 用于检测发光模组的光功率的检测系统及检测方法 - Google Patents

用于检测发光模组的光功率的检测系统及检测方法 Download PDF

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Publication number
WO2020114001A1
WO2020114001A1 PCT/CN2019/101546 CN2019101546W WO2020114001A1 WO 2020114001 A1 WO2020114001 A1 WO 2020114001A1 CN 2019101546 W CN2019101546 W CN 2019101546W WO 2020114001 A1 WO2020114001 A1 WO 2020114001A1
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WIPO (PCT)
Prior art keywords
light
area
emitting module
light emitting
detection
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PCT/CN2019/101546
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English (en)
French (fr)
Inventor
雷文超
Original Assignee
南昌欧菲生物识别技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from CN201822060043.5U external-priority patent/CN209310920U/zh
Priority claimed from CN201811494872.2A external-priority patent/CN111289102A/zh
Application filed by 南昌欧菲生物识别技术有限公司 filed Critical 南昌欧菲生物识别技术有限公司
Publication of WO2020114001A1 publication Critical patent/WO2020114001A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors

Definitions

  • the present application relates to the technical field of detecting the optical power of a light emitting module, and in particular to a detection system for detecting the optical power of a light emitting module and a method for detecting the maximum optical power of a light emitting module.
  • the maximum optical power of the light emitting module is generally detected by rotating and tilting the light emitting module by a predetermined angle, and each rotation or tilt of the predetermined angle causes a light emitting area of the light emitting module to be aligned with the light detector to obtain an optical power value
  • each rotation or tilt of the predetermined angle causes a light emitting area of the light emitting module to be aligned with the light detector to obtain an optical power value
  • the maximum optical power value is obtained by comparison to determine whether the excitation light module is harmful to human eyes, and the detection efficiency is low.
  • the present application provides a detection system for detecting the optical power of a light-emitting module and a method for detecting the maximum optical power of a light-emitting module.
  • the detection system of the embodiment of the present application includes a light-transmitting film, an image capturing device, and a light detection module, and the light-transmitting film and the image capturing device are sequentially disposed on the light emitting optical path of the light emitting module.
  • the imaging device is used to shoot the light-transmitting film to form a captured image.
  • the brightest area in the captured image and the light-emitting module The area to be detected corresponds.
  • the light detection module aligns with the area to be detected to obtain a maximum optical power of the light-emitting module.
  • the detection system of the embodiment of the present application illuminates the light-transmitting film through the light-emitting module, and the imaging device shoots the light-transmitting film to form a captured image.
  • the area to be detected of the light-emitting module corresponds to the brightest area in the captured image.
  • the maximum optical power of the light-emitting module can be obtained by detecting the area to be detected, so that the maximum optical power of the light-emitting module can be quickly detected, and the detection efficiency is higher and the detection result is more accurate.
  • the area to be detected includes a maximum area, and the brightest area in the captured image corresponds to the maximum area of the light emitting module; the light detection module is used to align the maximum The value area is detected to use the detected optical power value as the maximum optical power value of the light emitting module.
  • the brightest area corresponds to the maximum area, and the optical detection module can quickly obtain the maximum optical power of the light emitting module by detecting the optical power of the maximum area, and the detection efficiency is high.
  • the area to be detected includes a maximum area and a calibration area, the brightest area in the captured image corresponds to the maximum area of the light emitting module, and the calibration area is based on the maximum value A plurality of peripheral areas centered on the area; the light detection module is used to sequentially align the maximum area for detection and the calibration area for detection to compare the optical power of the maximum area with the calibration The larger of the optical power of the area is used as the maximum optical power value of the light emitting module.
  • the optical detection module detects the maximum value area and the surrounding calibration area.
  • the processor compares the optical power value of the maximum value area and the calibration area and uses the larger optical power value as the maximum optical power of the light emitting module. Fast, and the test results are more accurate.
  • the detection system further includes a mobile device for moving the light emitting module after acquiring the captured image so that the light detection module is aligned with the position of the light emitting module Describe the area to be detected.
  • the detection system moves the light-emitting module through the mobile device, which can quickly and accurately move the light-emitting module under the light detection module and align the area to be detected with the light-emitting module to detect the optical power of the area to be detected , Without manual operation, is conducive to automation.
  • the detection system further includes a mobile device for moving the light emitting module after acquiring the captured image so that the light detection module is aligned with the light emitting module A maximum value area and rotating the light emitting module after detecting the optical power of the maximum value area so that the light detecting module is aligned with the calibration area of the light emitting module.
  • the detection system moves the light emitting module through the mobile device so that the maximum area and the calibration area are sequentially aligned with the light detection module, which can quickly detect the optical power of the maximum area and the calibration area, thereby improving the detection efficiency.
  • the detection system further includes a track, and the light emitting module is placed on the track and can move along the track under the drive of the mobile device.
  • the mobile device moves on the track, and the movement is relatively stable.
  • the moving direction of the mobile device can be accurately controlled, which is beneficial to the alignment of the light emitting module and the light detection module, and improves the detection accuracy.
  • the detection system further includes a dark box capable of isolating visible light, and the light-transmitting film, imaging device, and light detector are all disposed in the dark box.
  • the dark box can isolate the light outside the dark box, thereby preventing the light outside the dark box from entering the dark box and affecting the quality of the captured image obtained by the imaging device.
  • the optical axis of the imaging device is parallel to or coincides with the central axis of the light emitting module.
  • the vertical distance of each area of the light emitting module from the imaging device is the same, thereby ensuring that when the imaging device acquires the captured image, the optical path of the light in each area is basically The same, the energy loss of light is basically the same, which can improve the detection accuracy.
  • the central axis of the light emitting module coincides with the optical axis of the imaging device.
  • the vertical distance of each area of the light emitting module from the image capturing device is the same, so that when the image capturing device acquires the captured image, the optical path of the light in each area is basically the same, and the energy loss of the light is also basically the same, which can improve the detection accuracy;
  • the field of view of the image capturing device only needs to cover the light emitting field of view of the light emitting module, and it is possible to accurately obtain almost all the light of the light emitting module without the need to provide a image capturing device with a larger field of view.
  • the detection system further includes a reflecting mirror, and the light emitted by the light emitting module is reflected by the reflecting mirror and directed toward the imaging device.
  • the detection system changes the light path of the light-emitting module by setting a reflecting mirror, so as to design the light-emitting light path of the light-emitting module more flexibly, and can adapt to dark boxes of different shapes.
  • the detection method of the maximum optical power of the light-emitting module is applied to a detection system.
  • the detection system includes a light-transmitting film, an image capturing device, and a light detection module.
  • the light-transmitting film and the image capturing device are sequentially arranged
  • the detection method includes controlling the light emitting module to emit light toward the light-transmitting film; controlling the imaging device to shoot toward the light-transmitting film to form a captured image; processing The captured image to obtain the brightest area of the captured image; the area to be detected of the light emitting module according to the brightest area; and the optical power of the area to be detected to obtain the light emitting module Maximum optical power.
  • the light-transmitting module irradiates the light-transmitting film, and the imaging device shoots the light-transmitting film to form a captured image.
  • the area to be detected of the light-emitting module corresponds to the brightest area in the captured image.
  • the maximum optical power of the light-emitting module can be obtained by detecting the area to be detected, so that the maximum optical power of the light-emitting module can be quickly detected, and the detection efficiency is higher and the detection result is more accurate.
  • FIG. 1 is a schematic structural diagram of a detection system according to some embodiments of the present application.
  • FIG. 2 is a schematic diagram of the principle of a detection system in some embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of another state of a detection system according to some embodiments of the present application.
  • FIG. 4 is a schematic structural diagram of a detection system according to some embodiments of the present application.
  • 5 and 6 are schematic structural diagrams of regions to be detected in some embodiments of the present application.
  • FIG. 7 is a schematic flowchart of a detection method according to some embodiments of the present application.
  • FIG. 8 is a schematic diagram of the detection system of some embodiments of the present application.
  • the detection system 100 for detecting the optical power of the light emitting module 200 includes a light-transmitting film 20, an imaging device 30 and a light detection module 40.
  • the light-transmitting film 20 and the imaging device 30 are sequentially arranged on the light-emitting optical path of the light-emitting module 200.
  • the light emitting module 200 is used to emit light.
  • the imaging device 30 is used to capture the transparent film 20 to form a captured image.
  • the brightest area in the captured image and the light emitting module 200 corresponds to the area to be detected 210; the light detection module 40 aligns with the area to be detected 210 to detect to obtain the maximum optical power of the light emitting module 200.
  • the light emitting module 200 emits light toward the light-transmitting film 20, and the light transmittance of the light-transmitting film 20 is within a predetermined light transmittance range (for example, 30% to 70%), so that the imaging device 30 photographs the light-transmitting film 20 In order to form a captured image, it will not cause overexposure due to excessive light, which will affect the quality of the captured image.
  • a predetermined light transmittance range for example, 30% to 70%
  • the stronger the light in a single area the higher the brightness of the illuminated area corresponding to the light-transmitting film 20, and the imaging device 30 acquires
  • the corresponding area of the captured image is also brighter, so the optical power of the area to be detected 210 corresponding to the brightest area in the captured image is generally the maximum optical power of the entire light-emitting module 200.
  • the light detection module 40 aligns the area to be detected 210 to obtain the optical power of the area to be detected 210 (that is, the maximum optical power of the light emitting module 200).
  • the detection system 100 of the embodiment of the present application irradiates the light-transmitting film 20 through the light-emitting module 200, and the imaging device 30 shoots the light-transmitting film 20 to form a captured image.
  • the area 210 to be detected of the light-emitting module 200 and the brightest area in the captured image corresponds to the light detection module 40 to detect the maximum light power of the light emitting module 200 by aligning the area to be detected 210, so that the maximum light power of the light emitting module 200 can be quickly detected, and the detection efficiency is higher and the detection result is more accurate .
  • the detection system 100 for detecting the optical power of the light emitting module 200 includes a dark box 10, a light-transmitting film 20, an imaging device 30, a light detection module 40, and a mobile device 50, and track 60.
  • the light emitting module 200, the light-transmitting film 20, the imaging device 30, the light detection module 40, the moving device 50, and the rail 60 are all provided in the dark box 10.
  • the light emitting module 200 may be an infrared light emitting module, for example, a vertical cavity surface emitter (Vertical-Cavity Surface-Emitting Laser, VCSEL), or a visible light emitting module (such as an array light emitting module 200 composed of light emitting diodes) , No restrictions here.
  • the light-emitting module 200 which is an infrared light-emitting module, has been widely used as a part of a structured light depth camera or a time-of-flight depth camera, which is used in mobile phones, tablet computers, automobiles, drones, smart wearable devices and other products Depth detection, however, in the process of depth detection, if the optical power is too large, it will cause harm to the human body.
  • the structured light depth camera or time-of-flight depth camera in the mobile phone will use the light-emitting module when the face is unlocked and paid. 200 to conduct in-depth inspection. If the optical power is too large, the human eye will be injured.
  • the dark box 10 is a closed box body, which can isolate the light outside the dark box 10, thereby preventing the light outside the dark box 10 from entering the dark box 10 and affecting the quality of the captured image acquired by the imaging device 30.
  • the imaging device 30 Since there is no influence of stray light outside the dark box 10, when the imaging device 30 photographs the light-transmitting film 20, the light only comes from the light emitting module 200.
  • the brightness of different areas of the captured image acquired by the imaging device 30 and the various areas of the light emitting module 200 The corresponding relationship of the brightness is good, which is helpful to improve the detection accuracy.
  • the dark box 10 may be a rectangular body, a trapezoidal body, etc., which can be determined according to the size and arrangement of the light-transmitting film 20, the imaging device 30, the light detection module 40, the moving device 50, and the track 60, and will not be done here limit.
  • the light transmittance of the light-transmitting film 20 is within a predetermined light transmittance range, and the predetermined light transmittance range is a light transmittance range of a corresponding range set based on light transmission requirements, for example, the predetermined light transmittance range is 30% to 70%
  • the predetermined light transmittance is 30%, 40%, 55%, 60%, 70%, etc.
  • the predetermined light transmittance range may also be 30% to 50%, for example, the predetermined light transmittance is 30%, 35%, 40%, 45%, 50%, etc.
  • the light-transmitting film 20 with appropriate light transmittance can be selected according to the light-emitting brightness of the light-emitting module 200, so that the captured image acquired by the imaging device 30 will not be overexposed or too dark, resulting in a relatively different brightness value in different areas. It is small to prevent errors in the determination of the brightest area and affect the detection accuracy.
  • the light-transmitting film 20 covers the light-emitting field of view of the light-emitting module 200 so that light in all areas of the light-emitting module 200 (that is, all light in the light-emitting field of view) can pass through the light-transmitting film 20.
  • the field of view of the image capturing device 30 covers the light emitting field of view of the light emitting module 200, so that light in all areas of the light emitting module 200 (ie, all light in the light emitting field of view) can be acquired by the image capturing device 30.
  • the imaging module 30 may be an infrared camera module or a visible light camera module, and only needs to correspond to the light emitting module 200 (infrared light emitting module and visible light emitting module), that is, when the light emitting module 200 emits infrared light In the case of a module, the imaging device 30 is an infrared camera module; when the light emitting module 200 is a visible light emitting module, the imaging device 30 is a visible light camera module.
  • the light emitting module 200 emits infrared light of a predetermined wavelength band
  • the image capturing device 30 only acquires infrared light of the predetermined wavelength band, so that the image capturing device 30 only acquires infrared light of the predetermined wavelength band emitted by the light emitting module 200.
  • the influence of light in other wave bands on the acquisition of the captured image by the imaging device 30 is further reduced to ensure detection accuracy.
  • the light-transmitting film 20 and the imaging device 30 are sequentially located on the light-emitting optical path of the light-emitting module 200.
  • the central axis of the light emitting module 200 coincides with the optical axis of the imaging device 30.
  • each area of the light emitting module 200 have the same vertical distance from the imaging device 30, so as to ensure that when the imaging device 30 acquires a captured image, the optical path of the light in each area is basically the same, and the energy loss of the light is also basically the same.
  • the central axis of the light emitting module 200 is parallel to the optical axis of the imaging device 30. In this way, the vertical distance of each area of the light emitting module 200 from the imaging device 30 is the same, thereby ensuring that when the imaging device 30 acquires a captured image, the optical path of the light in each area is basically the same, and the energy loss of the light is also basically the same. Improve detection accuracy.
  • the light detection module 40 is used to detect the optical power of the light emitting module 200.
  • the light detection module 40 includes an integrating sphere 42 and a light detector 44.
  • the light detector 44 is disposed on the integrating sphere 42.
  • the integrating sphere 42 is provided with a detection port 46 and a light entrance port 48, and a photodetector 44 is provided at the detection port 46 for detecting light from the detection port 46 to obtain optical power.
  • the integrating sphere 42 can evenly distribute the light entering from the light inlet 48 in the integrating sphere 42 so that the optical power of any part in the integrating sphere 42 is basically the same, thereby ensuring higher detection accuracy.
  • the size of the light inlet 48 is 7 millimeters (mm), which is basically the same as the aperture of the light received by the human eye.
  • the light emitting module 200 emits light toward the light detection module 40, the light inlet 48 is located in the integrating sphere Directly below 42, the distance between the light entrance 48 and the light emitting module 200 is 10 centimeters (cm), which is basically the same as the distance between the human eye and the electronic device when the user normally watches an electronic device such as a mobile phone, thereby playing a role in simulating the human eye
  • the human eye receives the light emitted by the light emitting module 200.
  • the maximum light detected can be determined by a processor, such as a computer Whether the power is greater than a predetermined optical power, wherein the predetermined optical power is the maximum optical power that does not pose a safety risk to human eyes, and when the maximum optical power is greater than the predetermined optical power, it can be determined that the detected light-emitting module 200 has human eye safety risks.
  • a processor such as a computer
  • judging whether the detected maximum optical power is greater than the predetermined optical power can also be a human judgment, for example, the user can know by comparing the maximum optical power with the predetermined optical power, and the specific judgment method is not limited to these two forms.
  • the mobile device 50 is installed on the rail 60 and can move along the rail 60.
  • the mobile device 50 is used to move the light emitting module 200, and the movement includes translation and rotation.
  • the mobile device 50 is provided with a light outlet 52 corresponding to the field of view of the light emitting module 200.
  • the light emitting module 200 is disposed in the mobile device 50, and the light emitted by the light emitting module 200 is emitted from the light outlet 52.
  • the light-transmitting film 20, the imaging device 30, and the light detection module 40 are all disposed directly above the rail 60. In the initial state, the mobile device 50 is located directly under the imaging device 30.
  • the mobile device 50 After determining the area 210 to be detected by the brightest area of the captured image, the mobile device 50 translates the light emitting module 200 to the light detection module along the track 60 Directly below 40, and aligning the area to be detected 210 with the light entrance 48, because during the movement, the mobile device 50 always travels along the track 60.
  • the movement process is smoother, and can emit light more accurately
  • the module 200 moves directly under the light detection module 40.
  • the movement efficiency is improved, which further improves the detection efficiency of the maximum optical power.
  • the moving device 50 can also rotate to drive the light emitting module 200 to rotate (can rotate around the center axis of the light emitting module 200 and deflect relative to the center axis), Finally, the area to be detected 210 is directly facing the light entrance 48 to detect the optical power of the area to be detected 210.
  • the detection system 100 of the embodiment of the present application irradiates the light-transmitting film 20 through the light-emitting module 200, and the imaging device 30 shoots the light-transmitting film 20 to form a captured image.
  • the light detection module 40 can detect the maximum light power of the light emitting module 200 by aligning the area to be detected 210, so that the maximum light power of the light emitting module 200 can be quickly detected, and the detection efficiency is higher and the detection result is more accurate .
  • the light-transmitting film 20, the imaging device 30, the light detection module 40, the moving device 50, and the track 60 are all provided in the dark box 10.
  • the dark box 10 is a closed box, which can isolate the light outside the dark box 10, thereby preventing the dark box
  • the light outside 10 enters the dark box 10 and affects the quality of the captured image acquired by the imaging device 30.
  • the size of the light inlet 48 is 7 millimeters (mm) (that is, the aperture of the light inlet 48 is 7 mm), which is basically the same as the aperture of the human eye receiving light, and the distance of the light inlet 48 from the light emitting module 200 It is 10 centimeters (cm), the distance is basically the same as the distance between the human eye and the electronic device when the user normally watches the mobile phone and other electronic devices. Therefore, it can accurately detect whether the light emitting module 200 exceeds the safety standard.
  • the detection system 100 further includes a reflecting mirror 80.
  • the light emitted by the light emitting module 200 is reflected by the reflecting mirror 80 and then is directed to the imaging device 30, that is, the light emitting module
  • the central axis of 200 is not parallel to the optical axis of the imaging device 30.
  • the detection system 100 can change the optical path of the light-emitting module 200 by providing the reflecting mirror 80, so as to flexibly design the light-emitting optical path of the light-emitting module 200, and can adapt to different shapes of dark boxes.
  • the area to be detected 210 is the maximum area 220.
  • the brightest area in the captured image corresponds to the maximum area 220.
  • the light detection module 40 is aligned with the maximum area 220 to detect The detected optical power value is used as the maximum optical power value of the light emitting module 200.
  • the maximum area 220 may be any position of the light emitting module 200.
  • the maximum area 220 may be a central area, an edge area, and the like of the light emitting module 200.
  • the brightest region corresponds to the maximum region 220.
  • the light detection module 200 can quickly obtain the maximum optical power of the light emitting module 200 by detecting the optical power of the maximum region 210, and the detection efficiency is high.
  • the area to be detected 210 includes a maximum area 220 and a calibration area 230
  • the brightest area in the captured image corresponds to the maximum area 220 of the light emitting module 200
  • the calibration area 230 is the maximum value A plurality of peripheral areas centered on the area 220.
  • the light detection module 40 is used to sequentially detect the maximum area 220 and the calibration area 230 for detection, and then the processor uses the larger of the optical power of the maximum area 220 and the optical power of the calibration area 230 as the light emitting mode The maximum optical power value of group 200.
  • the light power of the brightest area of the detected captured image may not be the maximum value, correspondingly, the light of the maximum area 220
  • the power may not be the maximum, so in order to further ensure that the detected optical power is the maximum optical power of the light emitting module 200, not only the maximum area 220 of the area to be detected 210 but also multiple calibrations around the maximum area 220 Area 230.
  • the size of the calibration area 230 and the size of the maximum area 220 may be the same or different.
  • the calibration regions 230 may be 2, 3, 4, etc. In this embodiment, as shown in FIG.
  • each calibration region 230 is the same as the size of the maximum region 220, and are located respectively
  • the maximum area 220 is adjacent to and directly adjacent to the front area 232, the rear area 234, the left area 236, and the right area 238.
  • the mobile device 50 rotates the light emitting module 200 at a predetermined deflection angle.
  • the predetermined deflection angle includes a predetermined rotation angle and a predetermined tilt angle.
  • the predetermined deflection angle may be based on the maximum area 220 or the calibration area 230
  • the size is determined, for example, the larger the maximum value area 220 or the calibration area 230, the larger the predetermined deflection angle; the smaller the maximum value area 220 or the calibration area 230, the smaller the predetermined deflection angle.
  • tilting the predetermined inclination angle to the front can align the rear area 234 with the light entrance 48, and tilting the predetermined inclination angle to the rear can make the positive
  • the front area 232 is aligned with the light entrance 48, and a predetermined inclination angle to the left area 236 can align the right area 238 with the light entrance 48, and a right angle 238 can be aligned with the light entrance 48 to the left area 236 .
  • the light detection module 40 can quickly detect the optical power of the maximum area 220 and the multiple calibration areas 230.
  • the processor uses the maximum optical power value of the two as the maximum optical power value of the light emitting module 200, so as to determine the light emitting module 200 more accurately Maximum optical power.
  • the detection method of the embodiment of the present application includes:
  • 030 Process the captured image to obtain the brightest area of the captured image
  • 050 Detect the optical power of the area to be detected 210 to obtain the maximum optical power of the light emitting module 200.
  • the light emitting module 200 emits light toward the transparent film 20.
  • the imaging device 30 is used to photograph the light-transmitting film 20 to form a photographed image; the processor is used to process the photographed image to acquire the brightest area of the photographed image, and acquire the area to be detected 210 of the light emitting module 200 according to the brightest area.
  • the light detection module 40 is used to detect the optical power of the area to be detected 210 to obtain the maximum optical power of the light emitting module 200.
  • step 010, step 020, step 030 and step 040 may be executed by the processor.
  • Step 050 can be performed by the light detection module 40.
  • the processor controls the light emitting module 200 directly under the imaging device 30 and directly opposite the imaging device 30.
  • the light emitting module 200 emits light toward the transparent film 20
  • the processor controls the imaging device 30 to shoot toward the light-transmitting film 20 to obtain a captured image, and the captured image corresponds to the light emitting module 200.
  • the processor can process the captured image, for example, convert the captured image into a grayscale image, and quickly determine the brightest area according to the area with the largest average grayscale value in the grayscale image.
  • the processor can quickly determine the area to be detected 210 of the light emitting module 200 corresponding to the brightest area of the captured image.
  • the mobile device 50 translates the light emitting module 200 to directly under the light detection module 40.
  • the processor determines the brightest area on the transparent film 20 corresponding to the brightest area of the captured image according to the correspondence between the captured image and the light-transmitting film 20.
  • the brightest area of the image corresponds to the area to be detected 210, so the brightest area of the transparent film 20 also corresponds to the area to be detected 210, that is to say, the light emitted by the area to be detected 210 is just the brightest of the transparent film 20 Cover the area, and then use the center of the light-transmitting film 20 as the origin O(0,0,0) to establish a three-dimensional coordinate system as shown in FIG.
  • the center of the to-be-detected area 210 is originally aligned with the center of the brightest area of the light-transmitting film 20.
  • P2O coincides with the X axis
  • the light-emitting module 200 is inclined by 45 degrees in the negative direction of the X axis.
  • P1P2 coincides with the Y axis, as shown in FIG. 8, at this time, the center of the area to be detected 210 is aligned with the center of the light-transmitting film 20.
  • the processor can calculate the coordinates of the center of the brightest area of the transparent film 20 in the three-dimensional coordinate system and the coordinates of the center of the light emitting surface of the light emitting module 200 in the three-dimensional coordinate system so that the center of the area to be detected 210 is aligned with the transparent The deflection angle (including rotation angle and tilt angle) of the center of the optical film 20.
  • the mobile device 50 moves the light-emitting module 200 to directly under the light detection module 40, the mobile device 50 rotates the light-emitting module 200 at a deflection angle (that is, rotates 30 degrees clockwise and then tilts 45 degrees in the negative direction of the X axis)
  • the center of the area to be detected 210 can be aligned with the center of the light inlet 48 (corresponding to the center of the light-transmitting film 20 ), that is, the area to be detected 210 can be aligned with the light inlet 48.
  • the light from the area to be inspected 210 enters the integrating sphere 42 from the light inlet 48 and is evenly distributed in the integrating sphere 42. A portion of the light is directed to the light located at the detection opening 46 The detector 44 is detected to obtain the maximum optical power of the light emitting module 200.
  • the light-transmitting film 20 is irradiated by the light-emitting module 200, the light-transmitting film 20 is photographed by the imaging device 30 to form a captured image, and the area 210 to be detected of the light-emitting module 200 corresponds to the brightest area in the captured image
  • the maximum optical power of the light emitting module 200 can be obtained, so that the maximum optical power of the light emitting module 200 can be quickly detected.
  • the detection efficiency is higher and the detection result is more accurate.
  • first and second are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
  • the features defined with “first” and “second” may include at least one of the features either explicitly or implicitly.
  • the meaning of “plurality” is at least two, such as two, three, etc., unless otherwise specifically limited.
  • Any process or method description in a flowchart or otherwise described herein may be understood as representing a module, segment, or portion of code that includes one or more executable instructions for implementing specific logical functions or steps of a process , And the scope of the preferred embodiment of the present application includes additional implementations, in which the functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present application belong.
  • a "computer-readable medium” may be any device that can contain, store, communicate, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.
  • computer-readable media include the following: electrical connections (electronic devices) with one or more wires, portable computer cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable and editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer-readable medium may even be paper or other suitable medium on which the program can be printed, because, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or other appropriate if necessary Process to obtain the program electronically and then store it in computer memory. It should be understood that each part of the present application may be implemented by hardware, software, firmware, or a combination thereof.
  • multiple steps or methods may be implemented with software or firmware stored in memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if it is implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: a logic gate circuit for implementing a logic function on a data signal Discrete logic circuits, dedicated integrated circuits with appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.
  • PGA programmable gate arrays
  • FPGA field programmable gate arrays
  • each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module.
  • the above integrated modules may be implemented in the form of hardware or software function modules. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.
  • the storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk.

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Abstract

一种用于检测发光模组（200）的光功率的检测系统（100），包括透光膜（20）、取像装置（30）和光检测模组（40），透光膜（20）及取像装置（30）依次设置在发光模组（200）的发光光路上；在发光模组（200）朝透光膜（20）发射光线时，取像装置（30）用于拍摄透光膜（20）以形成拍摄图像，拍摄图像中的最亮区域与发光模组（40）的待检测区域（210）具有对应关系；光检测模组（40）用于对准待检测区域（210）进行检测以获取发光模组（200）的最大光功率。

Description

用于检测发光模组的光功率的检测系统及检测方法
优先权信息
本申请请求2018年12月07日向中国国家知识产权局提交的专利申请号为201811494872.2、及专利申请号为201822060043.5的专利申请的优先权和权益，并且通过参照将其全文并入此处。
技术领域
本申请涉及发光模组的光功率的检测技术领域，特别涉及一种检测发光模组的光功率的检测系统及发光模组的最大光功率的检测方法。
背景技术
目前，发光模组的最大光功率的检测一般通过对发光模组旋转和倾斜预定角度，每次旋转或倾斜预定角度都使得发光模组的一个发光区域对准光检测器以获取一个光功率值，通过累计旋转360度和倾斜90度，将对应的发光模组所有发光区域均进行检测，然后比较获取最大光功率值以判断激发光模组是否对人眼有伤害，检测效率较低。
发明内容
本申请提供一种检测发光模组的光功率的检测系统和一种发光模组的最大光功率的检测方法。
本申请实施方式的检测系统包括透光膜、取像装置和光检测模组，所述透光膜及所述取像装置依次设置在发光模组的发光光路上。在所述发光模组朝所述透光膜发射光线时，所述取像装置用于拍摄所述透光膜以形成拍摄图像，所述拍摄图像中的最亮区域与所述发光模组的待检测区域对应。所述光检测模组对准所述待检测区域进行检测以获取所述发光模组的最大光功率。
本申请实施方式的检测系统通过发光模组照射透光膜，取像装置拍摄透光膜以形成拍摄图像，发光模组的待检测区域与拍摄图像中的最亮区域对应，光检测模组对准待检测区域进行检测就能获取发光模组的最大光功率，从而能够快速检测出发光模组的最大光功率，检测效率较高且检测结果较为准确。
在某些实施方式中，所述待检测区域包括最大值区域，所述拍摄图像中的最亮区域对应所述发光模组的最大值区域；所述光检测模组用于对准所述最大值区域进行检测以将检测到的光功率值作为所述发光模组的最大光功率值。
最亮区域与最大值区域对应，光检测模组通过检测最大值区域的光功率即可快速得到发光模组的最大光功率，检测效率高。
在某些实施方式中，所述待检测区域包括最大值区域及校准区域，所述拍摄图像中的最亮区域对应所述发光模组的最大值区域，所述校准区域为以所述最大值区域为中心的多个周边区域；所述光检测模组用于依次对准所述最大值区域进行检测及对准所述校准区域进行检测以将所述最大值区域的光功率与所述校准区域的光功率中较大者作为所述发光模组的最大光功率值。
光检测模组通过检测最大值区域及周边的校准区域，处理器通过比较最大值区域和校准区域的光功率值将其中较大的光功率值作为发光模组的最大光功率，不仅检测速度较快，而且检测结果较为精确。
在某些实施方式中，所述检测系统还包括移动装置，所述移动装置用于在获取拍摄图像之后移动所述发光模组以使得所述光检测模组对准所述发光模组的所述待检测区域。
在获取到拍摄图像后，检测系统通过移动装置移动发光模组，可快速准确地将发光模组移动到光检测模组下方并将待检测区域对准发光模组以检测待检测区域的光功率，无需人工操作，有利于实现自动化。
在某些实施方式中，所述检测系统还包括移动装置，所述移动装置用于在获取拍摄图像之后移动所述发光模组使得所述光检测模组对准所述发光模组的所述最大值区域、及在检测完所述最大值区域的光功率后转动所述发光模组使得所述光检测模组对准所述发光模组的所述校准区域。
检测系统通过移动装置移动发光模组以使得最大值区域和校准区域依次对准光检测模组，可快速地检测最大值区域和校准区域的光功率，从而提高检测效率。
在某些实施方式中，所述检测系统还包括轨道，所述发光模组放置在所述轨道上并能够在所述移动装置的驱动下沿着所述轨道移动。
移动装置在轨道上移动，移动较为平稳，且通过设计轨道的延伸方向可准确控制移动装置的移动方向，有利于发光模组与光检测模组的对准，提升检测精度。
在某些实施方式中，所述检测系统还包括能够隔绝可见光的暗箱，所述透光膜、取像装置、和光检测器均设置在所述暗箱内。
暗箱可隔绝暗箱外的光线，从而防止暗箱外的光线进入暗箱影响取像装置获取的拍摄图像的质量。
在某些实施方式中，所述取像装置的光轴与所述发光模组的中心轴平行或重合。
当发光模组的中心轴与取像装置的光轴平行，发光模组的各个区域离取像装置的 垂直距离均相同，从而保证取像装置获取拍摄图像时，各个区域的光线的光程基本相同，光线的能量损耗也基本相同，可提升检测精度。
当发光模组的中心轴与取像装置的光轴重合。不仅发光模组的各个区域离取像装置的垂直距离均相同，从而保证取像装置获取拍摄图像时，各个区域的光线的光程基本相同，光线的能量损耗也基本相同，可提升检测精度；而且取像装置的视场范围只需覆盖发光模组的发光视场范围，而无需设置较大视场范围的取像装置即可准确的获取到发光模组的几乎所有光线。
在某些实施方式中，所述检测系统还包括反射镜，所述发光模组发射的光线经所述反射镜反射后射向所述取像装置。
检测系统通过设置反射镜改变发光模组的光路，从而较为灵活的设计发光模组的发光光路，可适应不同形状的暗箱。
本申请实施方式的发光模组的最大光功率的检测方法应用于检测系统，所述检测系统包括透光膜、取像装置和光检测模组，所述透光膜及所述取像装置依次设置在所述发光模组的发光光路上，所述检测方法包括控制所述发光模组朝所述透光膜发射光线；控制所述取像装置朝所述透光膜拍摄以形成拍摄图像；处理所述拍摄图像以获取所述拍摄图像的最亮区域；根据所述最亮区域获取所述发光模组的待检测区域；及检测所述待检测区域的光功率以得到所述发光模组的最大光功率。
本申请实施方式的检测方法通过发光模组照射透光膜，取像装置拍摄透光膜以形成拍摄图像，发光模组的待检测区域与拍摄图像中的最亮区域对应，光检测模组对准待检测区域进行检测就能获取发光模组的最大光功率，从而能够快速检测出发光模组的最大光功率，检测效率较高且检测结果较为准确。
本申请的实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实施方式的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本申请某些实施方式的检测系统的结构示意图。
图2是本申请某些实施方式的检测系统的原理示意图。
图3是本申请某些实施方式的检测系统的另一状态的结构示意图。
图4是本申请某些实施方式的检测系统的结构示意图。
图5和图6是本申请某些实施方式的待检测区域的结构示意图。
图7本申请某些实施方式的检测方法的流程示意图。
图8是本申请某些实施方式的检测系统的原理示意图。
具体实施方式
以下结合附图对本申请的实施方式作进一步说明。附图中相同或类似的标号自始至终表示相同或类似的元件或具有相同或类似功能的元件。另外，下面结合附图描述的本申请的实施方式是示例性的，仅用于解释本申请的实施方式，而不能理解为对本申请的限制。
请一并参阅图1和图2，本申请实施方式的用于检测发光模组200的光功率的检测系统100包括透光膜20、取像装置30和光检测模组40。透光膜20及取像装置30依次设置在发光模组200的发光光路上。发光模组200用于发射光线，在发光模组200朝透光膜20发射光线时，取像装置30用于拍摄透光膜20以形成拍摄图像，拍摄图像中的最亮区域与发光模组200的待检测区域210对应；光检测模组40对准待检测区域210进行检测以获取发光模组200的最大光功率。
具体地，发光模组200朝透光膜20发射光线，透光膜20的透光率位于预定透光率范围(例如30％至70％)内，以使得取像装置30拍摄透光膜20以形成拍摄图像时不会因光线过强导致过曝，从而影响拍摄图像的质量，可以理解，单个区域的光线越强，透光膜20对应的被照射区域亮度越高，取像装置30获取到的拍摄图像的对应区域也越亮，所以拍摄图像中的最亮区域对应的待检测区域210的光功率一般为整个发光模组200的最大光功率，在根据拍摄图像的最亮区域确定待检测区域210后，光检测模组40对准待检测区域210以获取待检测区域210的光功率(即发光模组200的最大光功率)。
本申请实施方式的检测系统100通过发光模组200照射透光膜20，取像装置30拍摄透光膜20以形成拍摄图像，发光模组200的待检测区域210与拍摄图像中的最亮区域对应，光检测模组40对准待检测区域210进行检测就能获取发光模组200的最大光功率，从而能够快速检测出发光模组200的最大光功率，检测效率较高且检测结果较为准确。
请继续参阅图1和图2，本申请实施方式的用于检测发光模组200的光功率的检测系统100包括暗箱10、透光膜20、取像装置30、光检测模组40、移动装置50、和轨道60。发光模组200、透光膜20、取像装置30、光检测模组40、移动装置50和轨道60均设置在暗箱10内。
发光模组200可以是红外光发光模组，例如，垂直腔面发射器(Vertical-Cavity  Surface-Emitting Laser，VCSEL)，也可以是可见光发光模组(如发光二极管组成的阵列发光模组200)，在此不做限制。目前，为红外光发光模组的发光模组200，已经广泛作为结构光深度相机或飞行时间深度相机中的一个零件，应用于手机、平板电脑、汽车、无人机、智能穿戴设备等产品中进行深度检测，然而在深度检测的过程中，若光功率过大变会对人体造成伤害，例如手机中的结构光深度相机或飞行时间深度相机在人脸解锁、支付时，会利用发光模组200来进行深度检测，若光功率过大，人眼就会受到伤害。暗箱10为密闭的箱体，可隔绝暗箱10外的光线，从而防止暗箱10外的光线进入暗箱10影响取像装置30获取的拍摄图像的质量。
由于没有暗箱10外的杂光的影响，取像装置30拍摄透光膜20时，光线仅来自于发光模组200，取像装置30获取的拍摄图像不同区域的亮度与发光模组200各个区域的亮度的对应关系较好，有利于提升检测精度。
暗箱10可以是矩形体，也可以是梯形体等等，可根据透光膜20、取像装置30、光检测模组40、移动装置50和轨道60的大小以及排布确定，在此不做限制。
透光膜20的透光率位于预定透光率范围内，预定透光率范围为基于透光需求而设定的相应范围的透光率范围，例如预定透光率范围为30％至70％，例如预定透光率为30％、40％、55％、60％、70％等。优选地，预定透光率范围也可以是30％至50％，例如，预定透光率为30％、35％、40％、45％、50％等。可根据发光模组200的发光亮度选择合适的透光率的透光膜20，从而使得取像装置30获取的拍摄图像既不会过曝，也不会过暗导致不同区域的亮度值差异较小，从而防止最亮区域的确定出现误差，影响检测精度。
透光膜20覆盖发光模组200的发光视场范围，使得发光模组200所有区域的光线(即，发光视场内的所有光线)均可以穿过透光膜20。
取像装置30的视场范围覆盖发光模组200的发光视场范围，使得发光模组200所有区域的光线(即，发光视场内的所有光线)均能被取像装置30获取。取像模组30可以是红外摄像模组或可见光摄像模组，只需与发光模组200(红外发光模组和可见光发光模组)对应即可，即，当发光模组200为红外光发光模组时，取像装置30为红外摄像模组；当发光模组200为可见光发光模组时，取像装置30为可见光摄像模组。在其他实施方式中，发光模组200发射预定波段的红外光，取像装置30仅获取预定波段的红外光，从而使得取像装置30仅获取发光模组200发出的预定波段的红外光，可进一步降低其他波段的光线对取像装置30获取拍摄图像的影响，保证检测精度。
透光膜20和取像装置30依次位于发光模组200的发光光路上。本实施例中，发光模组200的中心轴与取像装置30的光轴重合。不仅使得发光模组200的各个区域离 取像装置30的垂直距离均相同，从而保证取像装置30获取拍摄图像时，各个区域的光线的光程基本相同，光线的能量损耗也基本相同，可提升检测精度；而且，取像装置30的视场范围只需覆盖发光模组200的发光视场范围，而无需设置较大视场范围的取像装置30即可准确的获取到发光模组200的几乎所有光线。在其他实施方式中，发光模组200的中心轴与取像装置30的光轴平行。如此，发光模组200的各个区域离取像装置30的垂直距离均相同，从而保证取像装置30获取拍摄图像时，各个区域的光线的光程基本相同，光线的能量损耗也基本相同，可提升检测精度。
光检测模组40用于检测发光模组200的光功率。光检测模组40包括积分球42和光检测器44，光检测器44设置在积分球42上。具体地，积分球42开设有检测口46和入光口48，光检测器44设置在检测口46，用以检测从检测口46出来的光线以获取光功率。积分球42可以将从入光口48进入的光线均匀分布在积分球42内，使得积分球42内任意部分的光功率基本一致，从而保证较高的检测精度。本实施例中，入光口48的大小为7毫米(mm)，和人眼接收光的孔径基本一致，在发光模组200朝光检测模组40发射光线时，入光口48位于积分球42的正下方，入光口48离发光模组200的距离为10厘米(cm)，该距离与用户正常观看手机等电子装置时人眼离电子装置的距离基本相同，从而起到模拟人眼正常观看手机等电子装置时人眼接收发光模组200发射的光线的作用，待光检测器44检测出发光模组200的最大光功率后，可通过处理器，例如计算机判断检测出来的最大光功率是否大于预定光功率，其中，预定光功率为对人眼无安全风险的最大光功率，在最大光功率大于预定光功率时即可判断被检测的发光模组200存在人眼安全风险。当然，判断检测出来的最大光功率是否大于预定光功率也可以是人为判断，例如用户比较最大光功率与预定光功率即可知道，具体的判断方式并不局限于此两种形式。
请参阅图2和图3，移动装置50安装在轨道60上并可以沿着轨道60进行移动。移动装置50用于移动发光模组200，移动包括平移以及转动。移动装置50开设有与发光模组200视场范围对应的出光口52，发光模组200设置在移动装置50内，发光模组200发射的光线从出光口52射出。本实施例中，透光膜20、取像装置30和光检测模组40均设置在轨道60的正上方。在初始状态下，移动装置50位于取像装置30的正下方，在通过拍摄图像的最亮区域确定待检测区域210后，移动装置50沿着轨道60将发光模组200平移到光检测模组40的正下方，并使得待检测区域210与入光口48对准，由于在移动过程中，移动装置50始终是沿着轨道60行进，一方面，移动过程较为平稳，可较为准确地将发光模组200移动到光检测模组40的正下方，另一方面，移动效率提高，进一步提升了最大光功率的检测效率。若仅仅依靠移动不能使得待检 测区域210与入光口48对准，移动装置50还能转动以带动发光模组200转动(可绕着发光模组200的中心轴自转及相对中心轴偏转)，最终使得待检测区域210正对入光口48以检测待检测区域210的光功率。
本申请实施方式的检测系统100通过发光模组200照射透光膜20，取像装置30拍摄透光膜20以形成拍摄图像，发光模组200的待检测区域210与拍摄图像中的最亮区域对应，光检测模组40对准待检测区域210进行检测就能获取发光模组200的最大光功率，从而能够快速检测出发光模组200的最大光功率，检测效率较高且检测结果较为准确。另外，透光膜20、取像装置30、光检测模组40、移动装置50和轨道60均设置在暗箱10内，暗箱10为密闭的箱体，可隔绝暗箱10外的光线，从而防止暗箱10外的光线进入暗箱10影响取像装置30获取的拍摄图像的质量。进一步地，入光口48的大小为7毫米(mm)(即，入光口48的孔径为7毫米)，和人眼接收光的孔径基本一致，入光口48离发光模组200的距离为10厘米(cm)，该距离与用户正常观看手机等电子装置时人眼离电子装置的距离基本相同，起到模拟人眼正常观看手机等电子装置时人眼接收发光模组200发射的光线的作用，从而可以准确地检测发光模组200是否超出安全标准。
请结合图4，在某些实施方式中，检测系统100还包括反射镜80，发光模组200发射的光线经过反射镜80反射后射射向取像装置30，也即是说，发光模组200的中心轴与取像装置30的光轴不平行。如此，检测系统100可通过设置反射镜80改变发光模组200的光路，从而灵活的设计发光模组200的发光光路，可适应不同形状的暗箱。
请结合图5，某些实施方式中，待检测区域210为最大值区域220，拍摄图像中的最亮区域与最大值区域220对应，光检测模组40对准最大值区域220进行检测以将检测到的光功率值作为发光模组200的最大光功率值。本实施例中，最大值区域220可以是发光模组200的任意位置，例如，最大值区域220可以是发光模组200的中心区域、边缘区域等。最亮区域与最大值区域220对应，光检测模组200通过检测最大值区域210的光功率即可快速得到发光模组200的最大光功率，检测效率高。
在其他实施方式中，请参阅图6，待检测区域210包括最大值区域220和校准区域230，拍摄图像中的最亮区域对应发光模组200的最大值区域220，校准区域230为以最大值区域220为中心的多个周边区域。光检测模组40用于依次对准最大值区域220进行检测及对准校准区域230进行检测，然后处理器将最大值区域220的光功率与校准区域230的光功率中较大者作为发光模组200的最大光功率值。
具体的，由于在取像装置30摄取拍摄图像时受环境因素或人为因素的影响，可能使得检测出的拍摄图像的最亮区域的光功率并非为最大值，对应地，最大值区域220 的光功率可能不是最大的，所以为了进一步保证检测出来的光功率为发光模组200的最大光功率，不仅要检测待检测区域210的最大值区域220，还要检测最大值区域220周边的多个校准区域230。校准区域230的大小与最大值区域220的大小可以相同，也可以不同。校准区域230可以是2个、3个、4个等，本实施例中，如图6，校准区域230为4个，每个校准区域230的大小与最大值区域220的大小相同，并分别位于最大值区域220相邻并相接的正前方区域232、正后方区域234、左边区域236和右边区域238。在检测完最大值区域220的光功率后，移动装置50以预定偏转角度转动发光模组200，预定偏转角度包括预定旋转角度和预定倾斜角度，预定偏转角度可根据最大值区域220或校准区域230的大小确定，例如，最大值区域220或校准区域230越大，预定偏转角度就越大；最大值区域220或校准区域230越小，预定偏转角度就越小。以最大值区域220位于发光模组200的发光面的中心为例，向正前方倾斜预定倾斜角度即可使得正后方区域234对准入光口48，向正后方倾斜预定倾斜角度即可使得正前方区域232对准入光口48，向左边区域236倾斜预定倾斜角度即可使得右边区域238对准入光口48，向右边区域238倾斜预定角度即可使得左边区域236对准入光口48。如此，光检测模组40可以快速检测最大值区域220及多个校准区域230的光功率。最后，处理器比较最大值区域220和多个校准区域230的光功率值后，将二者中最大的光功率值作为发光模组200的最大光功率值，从而较为准确地确定发光模组200的最大光功率。
请参阅图1和图7，本申请实施方式的检测方法包括：
010：控制发光模组200朝透光膜20发射光线；
020：控制取像装置朝透光膜20拍摄以形成拍摄图像；
030：处理拍摄图像以获取拍摄图像的最亮区域；
040：根据最亮区域获取发光模组200的待检测区域210；及
050：检测待检测区域210的光功率以得到发光模组200的最大光功率。
发光模组200朝透光膜20发射光线。取像装置30用于拍摄透光膜20以形成拍摄图像；处理器用于处理拍摄图像以获取拍摄图像的最亮区域、及根据最亮区域获取发光模组200的待检测区域210。光检测模组40用于检测待检测区域210的光功率以得到发光模组200的最大光功率。
也即是说，步骤010、步骤020、步骤030和步骤040可以由处理器执行。步骤050可以由光检测模组40执行。
具体地，请参阅图3和图8，初始状态下，处理器控制发光模组200在取像装置30的正下方并与取像装置30正对，发光模组200向透光膜20发射光线后，处理器控 制取像装置30朝透光膜20拍摄以获取拍摄图像，拍摄图像与发光模组200对应。处理器可对拍摄图像进行处理，例如将拍摄图像转化为灰度图像，根据灰度图像中平均灰度值最大的区域快速确定最亮区域。在确定最亮区域后，根据拍摄图像和发光模组200的对应关系，例如发光模组200右上角区域与拍摄图像的右上角区域对应，发光模组200中心区域与拍摄图像的中心区域对应。如此，处理器可以快速确定与拍摄图像的最亮区域对应的发光模组200的待检测区域210。接着，移动装置50平移发光模组200到光检测模组40的正下方，此时，为了将待检测区域210与光检测模组40的入光口48对准以使得待检测区域210发出的光线刚好被入光口48接收，进行如下处理：首先，处理器根据拍摄图像和透光膜20的对应关系，确定与拍摄图像的最亮区域对应的透明膜20上的最亮区域，由于拍摄图像的最亮区域与待检测区域210对应，所以透光膜20的最亮区域也与待检测区域210对应，也即是说，待检测区域210发出的光线刚好被透光膜20的最亮区域覆盖，然后以透光膜20中心为原点O(0，0，0)建立如图2所示的三维坐标系(单位均为厘米(cm))，发光模组200中心坐标P1为(0，0，10)(即发光模组200离透光膜20的距离为10cm)，透光膜20上最亮区域的中心P2的坐标为
Figure PCTCN2019101546-appb-000001
在XOY坐标平面，P2O与X轴的夹角为
Figure PCTCN2019101546-appb-000002
对应的角度为30度，P2O的长度为
Figure PCTCN2019101546-appb-000003
所以在P2、O、和P1组成的三角形中，P2P1与Z轴的夹角为tan10/10＝tan1，对应的角度为45度，也即是说，偏转角度为顺时针旋转30度、向X轴的负方向倾斜45度。待检测区域210中心本来对准透光膜20的最亮区域中心，发光模组200顺时针旋转30度后P2O与X轴重合，然后在发光模组200向X轴的负方向倾斜45度后P1P2与Y轴重合，如图8所示，此时，待检测区域210中心对准透光膜20的中心。如此，处理器根据透光膜20的最亮区域的中心在三维坐标系中的坐标及发光模组200的发光面中心在三维坐标系中的坐标可以计算出使得待检测区域210中心对准透光膜20的中心的偏转角度(包括旋转角度和倾斜角度)。
本实施例中，由于光检测模组40的入光口48与透光膜20在同一水平面(即XOY坐标平面上)，而且，入光口48的中心位于发光模组200的中心轴上，在移动装置50移动发光模组200到光检测模组40正下方后，移动装置50按偏转角度(即顺时针旋转30度，然后向X轴的负方向倾斜45度)转动发光模组200即可使得待检测区域210的中心对准入光口48的中心(对应透光膜20中心)，也即是说，待检测区域210对准入光口48。
最后，在待检测区域210对准入光口48后，待检测区域210的光线从入光口48进入积分球42后被均匀分布在积分球42内，一部分光线射向位于检测口46的光检测 器44被检测从而得到发光模组200的最大光功率。
本申请实施方式的检测方法通过发光模组200照射透光膜20，取像装置30拍摄透光膜20以形成拍摄图像，发光模组200的待检测区域210与拍摄图像中的最亮区域对应，光检测模组40对准待检测区域210进行检测就能获取发光模组200的最大光功率，从而能够快速检测出发光模组200的最大光功率，检测效率较高且检测结果较为准确。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本申请的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本申请的实施例所属技术领域的技术人员所理解。
在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的定序列表，可以具体实现在任何计算机可读介质中，以供指令执行系统、装置或设备(如基于计算机的系统、包括处理器40的系统或其他可以从指令执行系统、装置或设备取指令并执行指令的系统)使用，或结合这些指令执行系统、装置或设备而使用。就本说明书而言，"计算机可读介质"可以是任何可以包含、存储、通信、传播或传输程序以供指令执行系统、装置或设备或结合这些指令执行系统、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电连接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通 过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。应当理解，本申请的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。此外，在本申请各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。上述提到的存储介质可以是只读存储器，磁盘或光盘等。尽管上面已经示出和描述了本申请的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本申请的限制，本领域的普通技术人员在本申请的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (20)

  1. 一种用于检测发光模组的光功率的检测系统，其特征在于，所述检测系统包括透光膜、取像装置和光检测模组，所述透光膜及所述取像装置依次设置在所述发光模组的发光光路上；
    在所述发光模组朝所述透光膜发射光线时，所述取像装置用于拍摄所述透光膜以形成拍摄图像，所述拍摄图像中的最亮区域与所述发光模组的待检测区域具有对应关系；所述光检测模组用于对准所述待检测区域进行检测以获取所述发光模组的最大光功率。
  2. 根据权利要求1所述的检测系统，其特征在于，所述待检测区域包括最大值区域，所述拍摄图像中的最亮区域对应所述发光模组的最大值区域；所述光检测模组用于对准所述最大值区域进行检测以将检测到的光功率值作为所述发光模组的最大光功率值。
  3. 根据权利要求1所述的检测系统，其特征在于，所述待检测区域包括最大值区域及校准区域，所述拍摄图像中的最亮区域对应所述发光模组的最大值区域，所述校准区域为以所述最大值区域为中心的多个周边区域；所述光检测模组用于依次对准所述最大值区域进行检测及对准所述校准区域进行检测以将所述最大值区域的光功率与所述校准区域的光功率中较大者作为所述发光模组的最大光功率值。
  4. 根据权利要求1至3任意一项所述的检测系统，其特征在于，所述检测系统还包括：
    移动装置，所述移动装置用于在获取拍摄图像之后移动所述发光模组以使得所述光检测模组对准所述发光模组的所述待检测区域。
  5. 根据权利要求3所述的检测系统，其特征在于，所述检测系统还包括移动装置，所述移动装置用于在获取拍摄图像之后移动所述发光模组使得所述光检测模组对准所述发光模组的所述最大值区域、及在检测完所述最大值区域的光功率后转动所述发光模组使得所述光检测模组对准所述发光模组的所述校准区域。
  6. 根据权利要求5所述的检测系统，其特征在于，所述检测系统还包括：
    轨道，所述发光模组放置在所述轨道上并能够在所述移动装置的驱动下沿着所述轨道移动。
  7. 根据权利要求1所述的检测系统，其特征在于，所述检测系统还包括能够隔绝可见光的暗箱，所述透光膜、取像装置、和光检测器均设置在所述暗箱内。
  8. 根据权利要求1所述的检测系统，其特征在于，所述取像装置的光轴与所述发光模组的中心轴平行或重合。
  9. 根据权利要求1所述的检测系统，其特征在于，所述检测系统还包括反射镜，所述发光模组发射的光线经所述反射镜反射后射向所述取像装置。
  10. 根据权利要求1所述的检测系统，其特征在于，所述透光膜覆盖所述发光模组的发光视场范围，所述取像装置的视场范围覆盖所述发光模组的发光视场范围。
  11. 根据权利要求1所述的检测系统，其特征在于，所述透光膜的透光率位于30％至70％范围内。
  12. 根据权利要求1所述的检测系统，其特征在于，所述发光模组发射预定波段的红外光，所述取像装置仅接收所述预定波段的红外光。
  13. 根据权利要求1所述的检测系统，其特征在于，所述光检测模组包括积分球和光检测器，所述积分球开设有检测口和入光口，所述积分球用于将从所述入光口进入的光线均匀分布在所述积分球内，所述光检测器设置在所述检测口，以检测从所述检测口出来的光线。
  14. 根据权利要求13所述的检测系统，其特征在于，所述入光口的大小为7毫米，在所述发光模组朝所述光检测模组发射光线时，所述入光口位于所述积分球的正下方，所述入光口离所述发光模组的距离为10厘米。
  15. 一种发光模组的最大光功率的检测方法，应用于检测系统，其特征在于，所述检测系统包括透光膜、取像装置和光检测模组，所述透光膜及所述取像装置依次设置 在所述发光模组的发光光路上，所述检测方法包括：
    控制所述发光模组朝所述透光膜发射光线；
    控制所述取像装置朝所述透光膜拍摄以形成拍摄图像；
    处理所述拍摄图像以获取所述拍摄图像的最亮区域；
    根据所述最亮区域获取所述发光模组的待检测区域；及
    检测所述待检测区域的光功率以得到所述发光模组的最大光功率。
  16. 根据权利要求15所述的检测方法，其特征在于，所述处理所述拍摄图像以获取所述拍摄图像的最亮区域，包括：
    确定所述拍摄图像中平均灰度值最大的区域为所述最亮区域。
  17. 根据权利要求15所述的检测方法，其特征在于，所述根据所述最亮区域获取所述发光模组的待检测区域，包括：
    根据所述拍摄图像和所述发光模组的对应关系，确定所述最亮区域对应的所述待检测区域。
  18. 根据权利要求15所述的检测方法，其特征在于，所述检测所述待检测区域的光功率以得到所述发光模组的最大光功率，包括：
    根据所述最亮区域的位置和所述发光模组的发光面中心的位置确定偏转角度；及
    根据所述偏转角度偏转所述发光模组以使得所述待检测区域对准所述光检测模组。
  19. 根据权利要求15所述的检测方法，其特征在于，所述检测方法还包括：
    判断所述最大光功率是否大于预定光功率；及
    在所述光功率大于所述预定光功率时，确定所述发光模组存在人眼安全风险。
  20. 根据权利要求15所述的检测方法，其特征在于，所述待检测区域包括最大值区域及校准区域，所述拍摄图像中的最亮区域对应所述发光模组的最大值区域，所述校准区域为以所述最大值区域为中心的多个周边区域；所述检测方法还包括：
    对准所述最大值区域和所述光检测模组以检测所述最大值区域的光功率；
    依次对准多个所述校准区域和所述光检测模组以检测多个所述校准区域的光功率；及
    将所述最大值区域和多个所述校准区域的光功率中的最大值作为所述最大光功率。
PCT/CN2019/101546 2018-12-07 2019-08-20 用于检测发光模组的光功率的检测系统及检测方法 WO2020114001A1 (zh)

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