CN111366238B - ALS calibration device based on light intensity adjustable module and calibration method thereof - Google Patents
ALS calibration device based on light intensity adjustable module and calibration method thereof Download PDFInfo
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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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
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Abstract
The invention discloses an ALS calibrating device based on a light intensity adjustable module, which comprises: the rotary platform is provided with a first through hole and a second through hole; the fixed seat is positioned below the rotating platform and used for placing the ALS; the driving device is fixedly connected with the rotating platform and used for driving the rotating platform to rotate; a light source located above the rotating platform; an illuminometer located below the first through hole; and the light intensity adjustable module is fixedly arranged in the second through hole. According to the invention, the light intensity adjustable module is used for adjusting the light intensity values of different through holes, so that the automatic calibration of the tool uniformity is realized, and the workload of manual point inspection of production line operators is saved; the uniformity failure of the tool caused by equipment aging can be avoided, and the accuracy of the ALS calibration result of the product to be calibrated is ensured; meanwhile, the calibration error among different through holes of a plurality of devices is less than 5 percent, namely the uniformity of the device reaches more than 95 percent.
Description
Technical Field
The invention relates to the field of calibration devices, in particular to an ALS calibration device based on a light intensity adjustable module and a calibration method thereof.
Background
With the development of science and technology, the intelligent experience requirements on electronic products are higher and higher. The brightness of the screen of the products with the luminous screens, such as mobile phones, computers and intelligent sound equipment, needs to be adjusted in background light environments with different brightness so as to protect the eyes of users. The security probe can automatically switch between a daylight mode and a night scene mode when in daytime and at night. Based on this demand, an Ambient Light Sensor (ALS) has come into existence. ALS is installed in a mobile phone, a computer, an intelligent sound system and a security probe, and the purpose of adjusting the brightness of a product screen or switching a working mode is achieved according to the brightness of environment light detected by the ALS. However, due to the difference of the chips or the addition of a glass cover plate after packaging, the difference between the photosensitive capability of ALS and the photosensitive capability of human eyes is large. It is therefore desirable to calibrate ALS to a sensitivity that is close to that of human vision.
The mainstream scheme that adopts at present adopts one to one, and a set of tool can only test one product once, and such scheme adopts panel light as the light source usually, uses the illuminometer as calibration reference instrument. By adopting the scheme, the test fixture can be miniaturized, but only one product can be tested at one time, the test efficiency is low, and the comprehensive manufacturing cost is high. The scheme that the one drags many that improves the type adopts is to take the test scheme that drags four as an example, makes four fixing bases of placing the product in the frock, guarantees that the ALS on four products is on same ring after the product is placed, also places the probe of illuminometer on above-mentioned ring simultaneously. The light source is placed in the center of the circle. However, the requirement on the uniformity of the light source is high by adopting the scheme, the light intensity values of the plurality of test ports are close to the light intensity value of the position of the illuminometer, and the uniformity is controlled within 95 percent as much as possible. In order to ensure the uniformity of the light intensity values at different positions, a diffusion plate is additionally arranged below the light source, and the aim of achieving the uniformity of the light intensity values on the same circular ring is achieved through scattering. However, the light transmittance of the diffusion plate is affected due to aging or dirt of the diffusion plate, and the diffusion plate needs to be checked every day, so that the normal function of the diffusion plate is ensured, and the workload of point checking is increased.
Aiming at the defects in the existing ALS calibration test scheme, the invention provides an ALS calibration test solution based on a light intensity adjustable module, and simultaneously, the ALS calibration test solution can realize one-drive-more test.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the ALS calibration device based on the light intensity adjustable module and the calibration method thereof, which can avoid the failure of the uniformity of a tool caused by the aging of equipment and ensure the accuracy of the ALS calibration result of a product to be calibrated.
In order to achieve the purpose, the invention adopts the following technical scheme:
an ALS calibrating device based on adjustable module of light intensity includes:
the rotary platform is provided with a first through hole and a second through hole;
the fixed seat is positioned below the rotating platform and used for placing the ALS;
the driving device is connected with the rotating platform and is used for driving the rotating platform to rotate;
a light source located above the rotating platform;
the illuminometer is positioned below the first through hole;
and the light intensity adjustable module is fixedly arranged in the second through hole.
In some embodiments of the invention, the center of the first through hole and the center of the second through hole are located on the same circumference.
In some embodiments of the present invention, the light source is located above the center of the circle, and the irradiation surface of the light source covers the first through hole and the second through hole.
In some embodiments of the invention, the holder is configured to position the ALS, wherein the ALS is located at the same horizontal position and on the same circumference as the probe of the illuminometer.
In some embodiments of the present invention, the light intensity adjustable module and the second through hole are provided in plurality.
An ALS calibration method based on a light intensity adjustable module comprises the following steps:
s1, calibrating the light intensity adjustable module, and adjusting the light transmittance of the light intensity adjustable module by calculating the uniformity alpha of the light intensity adjustable module;
and S2, calibrating the ALS, calculating a compensation value by switching the brightness value of the light source, and writing the compensation value into the ALS.
In some embodiments of the present invention, the step S1 is specifically implemented by the following steps:
s11, lighting a light source, and obtaining a light intensity value L captured by a probe of the illuminometer through the first through hole;
s12, driving the rotary platform to rotate through the driving device, enabling the second through hole to reach the position right above the probe, and capturing the light intensity value L by the probe n Wherein n represents the nth module with adjustable light intensity;
s13, first judging the light intensity value L in the step S11 and the light intensity value L in the step S12 n Whether the formula one is satisfied
(ii) a Then setting the work of the light intensity adjustable moduleA voltage;
and S14, repeating the step S13, and resetting the rotary platform after the working voltage of the plurality of light intensity adjustable modules is set, so as to finish the calibration of the light intensity adjustable modules.
In some embodiments of the present invention, the step S11 further includes first setting a functional relationship between the transmittance T and the voltage V of the light intensity adjustable module.
In some embodiments of the present invention, the determining of step S13 includes: if so, the light transmittance T of the light intensity adjustable module is currently determined n Corresponding voltage V n Namely the working voltage; if not, adjusting the voltage of the light intensity adjustable module to V n ', such that at this voltage V n ' Next, the light intensity value L in step S11 and the light intensity value L in step S12 n The working voltage of the light intensity adjustable module is V when the formula I is satisfied n ', where n denotes the nth said adjustable light intensity module.
In some embodiments of the present invention, the step S2 is specifically implemented by the following steps:
s21, lighting a light source to obtain light intensity L ' captured by a probe of the illuminometer, light intensity D1' and light intensity D2' detected by the ALS, wherein D1' is the light intensity measured by a first photoelectric converter sensitive to visible light in the ALS, and D2' is the light intensity measured by a second photoelectric converter sensitive to infrared light in the ALS;
s22, switching the brightness value of the light source to obtain the light intensity L ' captured by the probe, the light intensities D1' and D2' detected by the ALS, wherein D1' is the light intensity detected by a first photoelectric converter sensitive to visible light in the ALS, and D2' is the light intensity detected by a second photoelectric converter sensitive to infrared light in the ALS;
s23, substituting L ', D1', D2' in step S21 and L ' ', D1' ' and D2' ' in step S22 into formula II:
obtaining a and b, wherein a and b are compensation values;
and S24, writing the a and the b in the step S23 into the ALS, and finishing the calibration of the ALS.
In some embodiments of the invention, the ALS is first placed directly below the second through hole in steps S1 and S2, with the probe of the illuminometer aligned with the center of the first through hole.
In some embodiments of the present invention, the manner of switching the brightness value of the light source in step S22 includes: the brightness value of the light source is changed by a dimmer or a plurality of light sources with different brightness values are switched by an air cylinder to move to the position right above the circumference.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the invention, the light intensity adjustable module is used for adjusting the light intensity values of different through holes, so that the automatic calibration of the tool uniformity is realized, and the manual point inspection workload of production line operators is saved. Before the test is started every day, firstly, a tool consistency calibration program is operated once, and the uniformity of the tool is ensured. The problem that the uniformity of the tool fails due to equipment aging can be avoided, and the accuracy of the ALS calibration result of the product to be calibrated is guaranteed. Through applying the scheme, the ALS calibration test scheme can be realized more conveniently, and the calibration error among different through holes of a plurality of devices is ensured to be less than 5%, namely the uniformity of the ALS calibration test scheme reaches more than 95%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a calibration device according to embodiment 1 of the present invention.
Fig. 2 is a schematic front view of a calibration device according to embodiment 1 of the present invention.
Fig. 3 is a schematic top view of a calibration device according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural diagram of the light intensity adjustable module according to embodiment 1 of the present invention.
Fig. 5 is a schematic structural diagram of a rotating platform according to embodiment 1 of the present invention.
Fig. 6 is a schematic position diagram of a rectangular through hole and a circular through hole in embodiment 1 of the present invention.
Reference numerals: 1-a light source; 2-a light intensity adjustable module; 21-a housing; 22-a communication line; 23-a body; 3-ALS to be calibrated; 4-fixing the base; 5, a motor; 6-support column; 7-illuminometer probe; 8-a rotating platform; 9-rectangular through holes; 10-circular through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
Example 1
As shown in fig. 1, the ALS calibration device based on the light intensity adjustable module of the present embodiment sequentially includes from top to bottom: the device comprises a light source 1, a rotating platform 8, a fixed seat 4, a support column 6 and a motor 5, wherein one end of the support column 6 penetrates through the fixed seat 4 and then abuts against the rotating platform 8, the other end of the support column 6 is fixed with the motor 5, a rotating shaft (not shown in the figure) is arranged in the support column 6, the motor 5 can drive the rotating platform 8 to rotate through the rotating shaft, and the support column 6, the motor 5 and the rotating shaft form a driving device in the embodiment; the fixed seat 4 is fixedly connected with the supporting column 6 and does not rotate relative to the supporting column 6.
As shown in fig. 5, with respect to the rotary platform 8, in this embodiment, the rotary platform 8 is cylindrical, and is provided with four second through holes and one first through hole; as shown in fig. 6, the second through hole in this embodiment is a rectangular through hole 9, and the first through hole is a circular through hole 10; the centers of the rectangular through holes 9 and the centers of the circular through holes 10 are located on the same circumference, wherein the circular through holes 10 are arranged at the center positions of circular arcs between two adjacent rectangular through holes 9. The connecting lines of the four rectangular through holes 9 are a rectangle, and the diagonal lines of the rectangle pass through the circle center position of the circumference. And a light intensity adjustable module 2 is fixedly arranged in each rectangular through hole 9. The conventional optically tunable module 2 generally includes a housing 21, a communication cable 22 and a main body 23, wherein the main body 23 is fixed inside the housing 21, and the communication cable 22 is connected to the main body 23 for transmitting control signals. Wherein the simple structure of the body 23 is: a layer of liquid crystal is packaged in the upper glass substrate and the lower glass substrate to form a liquid crystal box, polaroids with vertical light transmission axes are attached to the upper glass substrate and the lower glass substrate, corresponding electrode patterns are etched on the two glass substrates, and the liquid crystal is driven to rotate by applying voltages with different sizes in the electrodes, so that the light transmittance is changed.
The optically adjustable module 2 can be installed above the rectangular through hole 9, and can be glued or fixed by screws and thread strips. The working voltage of the light intensity adjustable module 2 can be set by the controller, so that the penetration rate T of the light intensity adjustable module 2 is changed, and the light intensity value required in the test process is realized.
As shown in fig. 2, the fixing seat 4 is placed with the ALS3 to be calibrated; as shown in fig. 3, an ALS3 to be calibrated is arranged below each rectangular through hole 9, and a light meter is arranged below each circular through hole 10; the center of the ALS3 to be calibrated is aligned with the center of the rectangular through hole 9, and the center of the illuminometer probe 7 is aligned with the center of the circular through hole 10, namely, each ALS3 to be calibrated and the illuminometer probe 7 fall on the circumference; meanwhile, each ALS3 to be calibrated and the illuminometer probe 7 are required to be positioned at the same horizontal position and on the same circumference so as to improve the uniformity of light source irradiation and ensure the accuracy of calibration; the installation mode of the illuminometer is not specifically limited, and the illuminometer can be placed on the fixed seat 4 and also can be fixed on the supporting column 6. The light source 1 is positioned above the rotating platform 8; particularly right above the center of a circle; the light source 1 has an irradiation surface larger than the circumference and can completely cover each of the rectangular through holes 9 and the circular through holes 10.
The calibration method of the ALS calibration device based on the light intensity adjustable module generally comprises the following two steps:
s1, calibrating the light intensity adjustable module:
because a one-to-many test scheme is adopted, the light intensity values of a plurality of rectangular through holes 9 are ensured to be consistent, and the light intensity values of different rectangular through holes 9 are close to the light intensity value captured by the illuminometer probe 7 (the uniformity alpha is defined to be more than or equal to 95%); the method is realized by the following steps:
s11, firstly setting a functional relation between the light transmittance T and the voltage V of the light intensity adjustable module 2; the functional relationship includes, but is not limited to, a linear relationship, a power functional relationship, etc.; the light source is lightened to obtain a light intensity value L captured by the illuminometer probe 7;
s12, the rotating platform 8 is driven to rotate by controlling the motor 5 and the rotating shaft, so that the rectangular through hole 9 reaches the position right above the illuminometer probe 7, and the probe captures the light intensity value L 1 ；
S13, first judging the light intensity value L in the step S11 and the light intensity value L in the step S12 1 Whether the formula one is satisfied
(ii) a If so, the light transmittance T of the light intensity adjustable module 2 is currently determined 1 Corresponding voltage V 1 Namely the working voltage; if not, adjusting the voltage of the light intensity adjustable module 2 to V according to the functional relation between the light transmittance T and the voltage V 1 ', such that at this voltage V 1 ' Next, the light intensity value L in step S11 and the light intensity value L in step S12 1 The working voltage of the light intensity adjustable module is V when the formula I is satisfied 1 ', wherein L 1 、V 1 And V 1 ' both represent the relevant data of the first adjustable light intensity module.
And S14, repeating the step S13, resetting the rotating platform 8 after setting the working voltages of the other three light intensity adjustable modules 2, and aligning the illuminometer probe 7 to the circle center position of the circular through hole 10 to finish the calibration of the light intensity adjustable module 2.
S2, calibrating the ALS3 to be calibrated: the ALS3 to be calibrated is provided with a first photoelectric converter and a second photoelectric converter, and the first photoelectric converter is sensitive to visible light and the second photoelectric converter is sensitive to infrared light by packaging optical filters with different wavelengths on the first photoelectric converter and the second photoelectric converter; meanwhile, the conversion relation between the light intensity value detected by the first photoelectric converter and the second photoelectric converter and the actual light intensity value is linear, and the formula II is satisfied:
where L is the actual light intensity unit, where the light intensity value captured using the illuminometer probe 7 is used, D1 is the light intensity value detected by the first photoelectric converter, D2 is the light intensity value detected by the second photoelectric converter, and a and b are compensation values. The method is realized by the following steps:
s21, lighting the light source to obtain the light intensity L ' captured by the illuminometer probe 7, the light intensity D1' detected by the first photoelectric converter and the light intensity D2' detected by the second photoelectric converter;
s22, switching the brightness value of the light source to obtain the light intensity L ' captured by the illuminometer probe 7, the light intensity D1' detected by the first photoelectric converter and the light intensity D2' detected by the second photoelectric converter;
s23, substituting L ', D1', D2' in step S21 and L ' ', D1' ' and D2' ' in step S22 into formula II:
establishing an equation set, and calculating to obtain a and b;
and S24, writing the a and b in the step S23 into the ALS3 to be calibrated, and completing the calibration of the ALS3 to be calibrated.
It is to be noted that ALS3 to be calibrated is first placed directly below each rectangular through hole 9 in steps S11 and S21, aligning the illuminometer probe 7 with the center of the circular through hole 10.
The manner for switching the luminance value of the light source in step S22 includes: the brightness value of the light source 1 is changed by a dimmer or a plurality of light sources 1 with different brightness values are switched by an air cylinder to move above the circle center.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The ALS calibration method based on the light intensity adjustable module adopts an ALS calibration device based on the light intensity adjustable module, and the calibration device comprises the following steps:
the rotary platform is provided with a first through hole and a second through hole;
the fixed seat is positioned below the rotating platform and used for placing the ALS;
the driving device is connected with the rotating platform and is used for driving the rotating platform to rotate;
a light source located above the rotating platform;
the illuminometer is positioned below the first through hole;
the light intensity adjustable module is fixedly arranged in the second through hole;
the method is characterized by comprising the following steps:
s1, calibrating the light intensity adjustable module, and adjusting the light transmittance of the light intensity adjustable module by calculating the uniformity alpha of the light intensity adjustable module;
and S2, calibrating the ALS, calculating a compensation value by switching the brightness value of the light source, and writing the compensation value into the ALS.
2. The ALS calibration method based on a light intensity adjustable module of claim 1, wherein a center of the first through hole and a center of the second through hole are located on a same circumference.
3. The ALS calibration method based on the module with adjustable light intensity of claim 2, wherein the light source is located above the center of the circle, and the illuminating surface of the light source covers the first through hole and the second through hole.
4. The ALS calibration method based on the light intensity adjustable module according to claim 1, wherein the ALS and the probe of the illuminometer are located at the same horizontal position and on the same circumference.
5. The method of any one of claims 1 to 4, wherein a plurality of the adjustable light intensity modules and the second through hole are provided.
6. The ALS calibration method based on the light intensity adjustable module according to claim 5, wherein the step S1 is specifically implemented by the following steps:
s11, lighting a light source, and obtaining a light intensity value L captured by a probe of the illuminometer through the first through hole;
s12, driving the rotary platform to rotate through the driving device, enabling the second through hole to reach the position right above the probe, and capturing the light intensity value L by the probe n Wherein n represents the nth module with adjustable light intensity;
s13, first judging the light intensity value L in the step S11 and the light intensity value L in the step S12 n Whether the formula one is satisfied
(ii) a Setting the working voltage of the light intensity adjustable module according to the transmittance of the light intensity adjustable module;
and S14, repeating the step S13, and resetting the rotary platform after the working voltage of the plurality of light intensity adjustable modules is set, so as to finish the calibration of the light intensity adjustable modules.
7. The ALS calibration method based on the module with adjustable light intensity of claim 6, wherein the determination process of step S13 comprises: if so, the light transmittance T of the light intensity adjustable module is currently determined n Corresponding voltage V n Namely the working voltage; if not, adjusting the voltage of the light intensity adjustable module to V n ', such that at this voltage V n ' Next, the light intensity value L in step S11 and the light intensity value L in step S12 n The working voltage of the light intensity adjustable module is V when the formula I is satisfied n ', where n denotes the nth said adjustable light intensity module.
8. The ALS calibration method based on the module with adjustable light intensity as claimed in claim 5, wherein the step S2 is implemented by the steps of:
s21, lighting a light source to obtain light intensity L ' captured by a probe of the illuminometer, light intensity D1' and light intensity D2' detected by the ALS, wherein D1' is the light intensity measured by a first photoelectric converter sensitive to visible light in the ALS, and D2' is the light intensity measured by a second photoelectric converter sensitive to infrared light in the ALS;
s22, switching the brightness value of the light source to obtain the light intensity L ' captured by the probe, the light intensities D1' and D2' detected by the ALS, wherein D1' is the light intensity measured by a first photoelectric converter sensitive to visible light in the ALS, and D2' is the light intensity measured by a second photoelectric converter sensitive to infrared light in the ALS;
s23, substituting L ', D1', D2' in step S21 and L ' ', D1' ' and D2' ' in step S22 into formula II:
obtaining a and b, wherein a and b are compensation values;
and S24, writing the a and the b in the step S23 into the ALS, and finishing the calibration of the ALS.
9. The ALS calibration method based on the light intensity adjustable module according to claim 5, wherein in the steps S1 and S2, the ALS is firstly placed right below the second through hole, and a probe of a illuminometer is aligned with the center of the first through hole.
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| TWI630420B (en) * | 2016-10-14 | 2018-07-21 | 國立中央大學 | System for calibrating optoelectronic device employing optical attenuator, and method thereof |
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