KR101656702B1 - Apparatus and method for evaluating integrating sphere system - Google Patents

Apparatus and method for evaluating integrating sphere system Download PDF

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KR101656702B1
KR101656702B1 KR1020150071083A KR20150071083A KR101656702B1 KR 101656702 B1 KR101656702 B1 KR 101656702B1 KR 1020150071083 A KR1020150071083 A KR 1020150071083A KR 20150071083 A KR20150071083 A KR 20150071083A KR 101656702 B1 KR101656702 B1 KR 101656702B1
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South Korea
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optical sensor
photometer
light source
output
temperature
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KR1020150071083A
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Korean (ko)
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임홍우
윤양기
형재필
이창훈
이영주
정의효
이민혁
한우석
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재단법인 한국기계전기전자시험연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • G01J1/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values

Abstract

An integral sphere system reliability evaluation apparatus and an integral sphere system reliability evaluation method are disclosed. The disclosed invention includes: an integrating sphere for diffusing and reflecting light emitted from a light source; an optical sensor for receiving light reflected and diffused by the integrating sphere; a photometer for measuring the intensity of light using the current value output from the optical sensor; An integrated sphere system reliability evaluation apparatus for verifying reliability of an integrating sphere system including a cable for transmitting a current outputted from an optical sensor to a photometer, comprising: a power supply unit for supplying power to a light source; An optical sensor measuring unit for measuring a current value output from the optical sensor; And a verification module for controlling the operation of the power supply to adjust the output value of the light source and verifying the reliability of the integrating sphere system using the output value of the light source and the measured values measured by the optical sensor measuring unit and the photometer, do.

Figure R1020150071083

Description

TECHNICAL FIELD [0001] The present invention relates to an integral sphere system reliability evaluation apparatus and an integration sphere system reliability evaluation method,

The present invention relates to an integrated sphere system reliability evaluating apparatus and an integrating sphere system reliability evaluating method. More particularly, the present invention relates to an integrating sphere system reliability evaluating apparatus for evaluating the reliability of an integrating sphere system used for analyzing characteristics of a light source, And an old system reliability evaluation method.

Recently, the development of new light sources such as LED (Light Emitting Diode) and EL (Electro Luminescence) is rapidly proceeding.

As an indicator for evaluating such a light source, an indicator such as a total luminous flux (light flux) of a light source or a light color is used.

Particularly, the total flux of the light source is an important index for obtaining the lamp efficiency as well as the output of the light source.

As such a method of measuring the total flux of the light source, an integrating sphere obtained by applying a diffusion material such as barium sulfate to the inner wall of a hollow sphere is generally used.

The integrating sphere is a device for measuring the light emission characteristics of the light source in the integrating sphere by providing a light source inside the sphere. The integrating sphere uniformizes the light emitted from the light source illuminated at the center of the integrating sphere and calculates the total light flux based on the illuminance of the uniformized light can do.

That is, when light is emitted radially from a light source provided in the integrating sphere, the emitted light is multiply diffused and reflected by the diffusion material applied to the integrating sphere. When the diffused and reflected light is incident on the photodetector, Can be guided to the light intensity meter to measure the total flux of the emitted light.

In this way, the output of the light source, the lamp efficiency, etc. can be obtained through the total flux of the light source calculated using the integrating sphere system using the integrating sphere. However, when the reliability of the value measured by the integrating sphere system is low, It is required to develop an evaluation apparatus and an evaluation method for verifying the measurement reliability of the integral sphere system.

The background art of the present invention is disclosed in Korean Registered Patent No. 10-1287311 (Registered Jul. 1, 2013, entitled "Light Emitting Device Inspection Apparatus").

An object of the present invention is to provide an integral sphere system reliability evaluation apparatus and an integral sphere system reliability evaluation method which can effectively verify the measurement reliability of the integral sphere system and can provide highly reliable verification results.

According to an aspect of the present invention, there is provided an apparatus for evaluating the accuracy of an integrating sphere system, comprising: an integrating sphere for diffusing and reflecting light emitted from a light source; an optical sensor for receiving light diffused and reflected from the integrating sphere; 1. An integrated sphere reliability evaluation apparatus for verifying the reliability of an integrating sphere system including a photometer for measuring the intensity of light using a current value and a cable for transmitting a current outputted from the optical sensor to the photometer, A power supply unit for supplying power to the light source; An optical sensor measuring unit measuring a current value output from the optical sensor; And controlling the operation of the power supply unit so that the output value of the light source is controlled. The reliability of the integrating sphere system is measured using the output value of the light source, the measured value measured by the optical sensor measuring unit, and the measured value output from the photometer, And a verification module for verifying.

The verification module may further include: a control unit for controlling an operation of the power supply unit so that an output value of the light source is adjusted; A calculating unit for calculating the intensity of light incident on the optical sensor using the current value measured by the optical sensor measuring unit; And a verifying unit for calculating a difference value between the calculated value calculated by the calculating unit and the measured value output from the photometer and verifying the reliability of the measured value output from the photometer.

Further, the present invention may further comprise a temperature measuring unit for measuring a temperature around the integrating sphere system, a temperature of the light source, a temperature of the integrating sphere, and a temperature of the optical sensor; Wherein the verifying unit corrects the calculated value calculated by the calculating unit and the measured value output from the photometer using the information about the temperature measured by the temperature measuring unit, It is preferable to verify the reliability of the measurement value output from the measurement apparatus.

The apparatus may further include a storage unit that stores information about the output value of the light source, the temperature measured by the temperature measuring unit, the calculated value calculated by the calculating unit, and the measured values output from the photometer, in a time series.

The optical sensor measuring unit may be connected to the optical sensor through the cable, and may be connected to the optical sensor in parallel.

According to another aspect of the present invention, there is provided a reliability evaluation method of an integral sphere system, including: an integrating sphere for diffusing and reflecting light emitted from a light source; an optical sensor for receiving light diffused and reflected from the integrating sphere; And a cable for transmitting the current outputted from the photosensor to the photometer, the reliability of the integral sphere system being verified with the reliability of the integral sphere system, Adjusting an output of the light source; Measuring a current value output from the optical sensor; Calculating the intensity of light incident on the optical sensor using the measured current value; And verifying the reliability of the measured value output from the photometer by calculating a difference between the calculated value of the intensity of the light incident on the optical sensor and the measured value output from the photometer.

Measuring a temperature of the integrating sphere system, a temperature of the light source, a temperature of the integrating sphere, and a temperature of the optical sensor; And correcting the measured value output from the photometer and the calculated value incident on the optical sensor using information on the measured temperature.

The method may further include storing information about the output value of the light source, the temperature measured by the temperature measuring unit, the calculated value calculated by the calculating unit, and the measured value output from the photometer, in a time series.

According to the integral sphere system reliability evaluation apparatus and the integral sphere system reliability evaluation method of the present invention, it is possible to construct an automatic evaluation system that can effectively verify the measurement reliability of the integral sphere system, However, it has the effect of storing and outputting general information about the reliability evaluation of the integral spherical system so that the user can grasp it.

1 is a block diagram showing the configuration of an integral sphere system reliability evaluation apparatus according to an embodiment of the present invention.
2 is a block diagram showing a control flow of an integral sphere system reliability evaluation apparatus according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating an integral sphere system reliability evaluation process according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an integrating sphere system reliability evaluating apparatus and an integrating sphere system reliability evaluating method according to the present invention will be described with reference to the accompanying drawings. For convenience of explanation, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram showing the configuration of an integral sphere system reliability evaluation apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus 10 for evaluating reliability of an integrating sphere system 100 according to an embodiment of the present invention is provided to verify the reliability of an integrating sphere system, and is connected to an integrating sphere system.

The integrating sphere system may be provided in a form including the integrating sphere 11, the optical sensor 13, the photometer 15 and the cable 17.

The integrating sphere 11 is formed in a spherical shape in which two hemispheres with an empty interior are combined, and a diffusion material having high reflectance such as barium sulfate is applied to the interior.

A light source 11 such as an LED is provided in the integrating sphere 11. When the light is emitted radially from the light source 1 provided in the integrating sphere 11 as described above, And can be uniformly distributed on the surface of the integrating sphere 11.

Thus, when the light uniformly distributed by the integrating sphere 11 is incident on the optical sensor 13, the optical sensor 13 outputs the current of the corresponding value according to the front speed of the incident light, 13 are transmitted to the photometer 15 through the cable 17. [

The photometer 15 can measure physical quantities such as the total speed, intensity, luminance, and illumination of the light emitted from the light source 1 based on the current transmitted from the photosensor 13, The analog signal of the measured physical quantity can be converted into a digital signal through the precision analog-to-digital converter (ADC) 19 and output from the photometer 15.

The integrated spherical system reliability evaluation apparatus 100 of this embodiment is installed to be connected to the reliability of the integral spherical system thus constructed and includes a power supply unit 110, an optical sensor measurement unit 120, a temperature measurement unit 130, And a verification module (140).

The power supply unit 110 is provided to supply power to the light source 1. The power supply unit 110 may be controlled by a control unit 141 to control a voltage supplied to the light source 1 so that the output of the light source 1 may be adjusted.

The optical sensor measuring unit 120 is provided to measure the value of the current outputted from the optical sensor 13, that is, the current value.

The optical sensor measuring unit 120 is connected to the optical sensor 13 through a cable 17 and measures a current value outputted from the optical sensor 13. In this embodiment, 17, and is connected in parallel with the photometer 15, for example.

The optical sensor measuring unit 120 can directly obtain the current value output from the optical sensor 13 by directly measuring the current value output from the optical sensor measuring unit 120 .

The temperature measuring unit 130 is provided to measure the temperatures of a plurality of channels including the temperature of the integrating sphere system and its surroundings, that is, the integrating sphere 11 and its surroundings.

In this embodiment, the temperature measuring unit 130 measures the temperature around the four channels, i.e., the integrating sphere system, the temperature of the light source 1, the temperature of the integrating sphere 11, and the temperature of the optical sensor 13 For example.

The temperature measuring unit 130 measures the temperature of the integrating sphere system, the light source 1, the integrating sphere 11 and the optical sensor 13 to measure the output of the light source 1, It is possible to obtain information on the temperature which may affect the measurement.

The verification module 140 controls the operation of the power supply unit 110 to adjust the output value of the light source 1 and verifies the reliability of the integrating sphere system using the output value of the light source 1 and the measured value output from the photometer do. The verification module 140 includes a control unit 141, a calculation unit 143, and a verification unit 145.

The control unit 141 controls the operation of the power supply unit 110 so that the output value of the light source 1 is adjusted. That is, the control unit 141 adjusts the operation of the power supply unit 110 so that the power supply time, voltage, etc. of the power supply supplied from the power supply unit 110 to the light source 1 are controlled, So that the operating time and output of the light source 1 can be adjusted according to the voltage value.

The control of the operation of the controller 141 may be performed according to a pre-input operating program, or may be performed by manual input of a measurer.

The control section 141 also controls the operations of the temperature measuring section 130, the calculating section 143, the verifying section 145 and the storing section 147, which will be described later, So that the process of evaluating the integral sphere system reliability of the system 100 can be performed automatically.

The calculating unit 143 calculates the intensity of the light incident on the optical sensor 13 using the current value measured by the optical sensor measuring unit 120. [ The calculating unit 143 calculates the calculated value of the same dimension as the measured value output from the photometer 15 by using the current value measured by the optical sensor measuring unit 120, A comparison between the numerical value of the measured result and the numerical value of the result outputted from the photometer 15 and a difference value calculation are made possible.

The verifying unit 145 calculates the difference between the calculated value calculated by the calculating unit 143 and the measured value output from the photometer 15 and verifies the reliability of the measured value output from the photometer 15.

That is, the verifying unit 145 compares the calculated value calculated by the calculating unit 143 with the measured value output from the photometer 15 to determine the degree of the difference between the two values, and through the photometer 15 The reliability of the measured value output from the sensor is verified.

On the other hand, the verification unit 145 corrects the measured value output from the photometer 15 and the calculated value calculated by the calculating unit 143 using the information about the temperature measured by the temperature measuring unit 130, The corrected measured value can be used to verify the reliability of the measured value output from the photometer 15.

That is, the verification unit 145 acquires information about the temperature collected through the temperature measurement unit 130, that is, information about the temperature around the integrating sphere system, the light source 1, the integrating sphere 11, The temperature of the light source 1, the integrating sphere 11 and the light sensor 13 is measured to determine the temperature of the light source 1 and the output of the light source 1 and the measurement characteristics of the light sensor 13 And how much influence has been applied.

The verification unit 145 then corrects the calculated correction value using the calculated value calculated by the calculation unit 143 and the measured value output from the photometer 15 and outputs the corrected value to the photometer 15 ) Can verify the reliability of the output measured value.

The verifying unit 145 can also grasp the degree of the supply time of the power supplied to the light source 1 and the output value of the light source 1 with respect to the voltage. The operation reliability of the light source 1 can be grasped by comparing it with a theoretical output value to be outputted in comparison with the supply time and voltage of the power source.

The verifying unit 145 compares the current value measured by the optical sensor measuring unit 120 with pre-stored information, that is, a theoretical current value to be output from the optical sensor 13 to the output value of the light source 1, The operation reliability of the sensor 13 can be grasped.

In addition, the verification module 140 of the present embodiment may further include a storage unit 147. [ The storage unit 147 stores information about the output value of the light source 1, the temperature measured by the temperature measurement unit 130, the calculated value calculated by the calculation unit 143, and the measured value output from the photometer 15 The sorted values can be stored in a CSV (Comma Separated Value) file format, so that the user can grasp the overall reliability of the integral sphere system.

FIG. 2 is a block diagram showing a control flow of an integral sphere system reliability evaluation apparatus according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating an integration sphere system reliability evaluation process according to an embodiment of the present invention.

Hereinafter, an integral sphere system reliability evaluation method according to the present embodiment will be described with reference to Figs. 2 and 3. Fig.

In order to evaluate the reliability of the integral sphere system using the integral sphere system reliability evaluation apparatus 100 according to the present embodiment, the output of the light source 1 is first adjusted (S10).

The output of the light source 1 may be controlled by controlling the operation of the power supply unit 110 that supplies power to the light source 1. The operation of the power supply unit 110 may be controlled by controlling the operation of the control unit 141 have.

The operation of the control unit 141 is controlled by controlling the operation of the power supply unit 110 so that the power supply time and voltage of the power supply supplied from the power supply unit 110 to the light source 1 are controlled, The operation time and the output of the light source 1 can be adjusted according to the value of the supplied voltage.

When light is emitted from the light source 1 by controlling the output of the light source 1 and light is measured in the integrating sphere system, the current value output from the light sensor 13 is measured (S20).

The measurement of the current value output from the optical sensor 13 is performed by the optical sensor measuring unit 120. The optical sensor measuring unit 120 is connected to the optical sensor 13 via the cable 17, The current value output from the light sensor 13 can be directly measured to acquire information on the current output value of the optical sensor 13.

The information on the current value measured by the optical sensor measuring unit 120 is transmitted to the calculating unit 143 and the calculating unit 143 calculates the current value measured by the optical sensor measuring unit 120 using the current value measured by the optical sensor measuring unit 120 (Step S30).

The calculating unit 143 calculates the calculated value of the same dimension as the measured value output from the photometer 15 by using the current value measured by the optical sensor measuring unit 120, So that a comparison between the numerical value of the result and the numerical value of the result outputted from the photometer 15 and the calculation of the difference value are made possible.

The temperature of the integrating sphere system, the temperature of the light source 1, the temperature of the integrating sphere 11, and the temperature of the integrating sphere during the process of measurement by the optical sensor measuring unit 120 and measurement by the photometer 15, The temperature of the optical sensor 13 is measured (S40).

The verifying unit 145 corrects the calculated value calculated by the calculating unit 143 and the measured value output from the photometer 15 using the information about the temperature acquired as described above (S50) The measured value can be used to verify the reliability of the output measurement output from the photometer 15.

That is, the verification unit 145 acquires information about the temperature collected through the temperature measurement unit 130, that is, information about the temperature around the integrating sphere system, the light source 1, the integrating sphere 11, The temperature of the light source 1, the integrating sphere 11 and the light sensor 13 is measured to determine the temperature of the light source 1 and the output of the light source 1 and the measurement characteristics of the light sensor 13 And how much influence has been applied.

The verification unit 145 then corrects the calculated correction value using the calculated value calculated by the calculation unit 143 and the measured value output from the photometer 15 and outputs the corrected value to the photometer 15 ) Can verify the reliability of the output measured value.

The verification unit 145 that has calibrated the output value calculated by the calculation unit 143 and the measurement value output from the photometer 15 as described above calculates the correction value using the calibrated calculated value and the measured value to the optical sensor 13 The reliability value of the output value outputted from the photometer 15 is verified by calculating the difference between the calculated value obtained by calculating the intensity of the incident light and the measured value output from the photometer 15 (S60).

That is, the verifying unit 145 compares the calculated value calculated by the calculating unit 143 with the measured value output from the photometer 15 to determine the degree of the difference between the two values, and through the photometer 15 The reliability of the measured value output from the sensor is verified.

For example, when the difference between the two values detected by the verification unit 145 is calculated as about 10% of the calculated value calculated by the calculation unit 143, It can be shown that the reliability of the value is about 90%.

The verifying unit 145 can also grasp the degree of the supply time of the power supplied to the light source 1 and the output value of the light source 1 with respect to the voltage. The operation reliability of the light source 1 can be grasped by comparing it with a theoretical output value to be outputted in comparison with the supply time and voltage of the power source.

The verifying unit 145 compares the current value measured by the optical sensor measuring unit 120 with pre-stored information, that is, a theoretical current value to be output from the optical sensor 13 to the output value of the light source 1, The operation reliability of the sensor 13 can be grasped.

The output value of the light source 1, the information about the temperature measured by the temperature measuring unit 130, the calculated value calculated by the calculating unit 143, the output value from the photometer 15, The measured values are stored in the storage unit 147 in a time series and information about the operational reliability of the light source 1, the optical sensor 13, and the photometer 15 can be stored.

The information thus stored can be provided to the measurement person to grasp the overall evaluation of the integral sphere system reliability evaluation.

According to the integral sphere system reliability evaluation apparatus and integral sphere system reliability evaluation method of the present embodiment as described above, it is possible to construct an automatic evaluation system that can effectively verify the measurement reliability of the integral sphere system, and to provide a reliable verification result In addition, it is possible to store and output the overall information about the reliability evaluation of the integral spherical system so that the user can grasp the result.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

1: Light source 11: Integral sphere
13: optical sensor 15: photometer
17: Cable 19: ADC
100: Integral sphere system reliability evaluation apparatus 110: Power supply unit
120: optical sensor measuring unit 130: temperature measuring unit
140: verification module 141:
143: Calculator 145: Verifier
147:

Claims (8)

delete An optical integrator for diffusing and reflecting the light emitted from the light source, an optical sensor for receiving the light diffused and reflected by the integrating sphere, a photometer for measuring the intensity of light using the current value output from the optical sensor, 1. An integrated sphere reliability evaluating apparatus for verifying the reliability of an integrating sphere system including a cable for transmitting a current outputted from a sensor to the photometer,
A power supply unit for supplying power to the light source;
An optical sensor measuring unit measuring a current value output from the optical sensor; And
The operation of the power supply unit is controlled so that the output value of the light source is controlled and the reliability of the integrating sphere system is verified by using the output value of the light source and the measured value measured by the optical sensor measuring unit and the measured value output from the photometer A verification module,
Wherein the verification module comprises:
A control unit for controlling the operation of the power supply unit so that an output value of the light source is adjusted;
A calculating unit for calculating the intensity of light incident on the optical sensor using the current value measured by the optical sensor measuring unit; And
And a verifying unit for calculating a difference value between the calculated value calculated by the calculating unit and the measured value output from the photometer and verifying the reliability of the measured value output from the photometer, .
3. The method of claim 2,
Further comprising: a temperature measuring unit for measuring a temperature around the integrating sphere system, a temperature of the light source, a temperature of the integrating sphere, and a temperature of the optical sensor;
Wherein the verifying unit corrects the calculated value calculated by the calculating unit and the measured value output from the photometer using the information about the temperature measured by the temperature measuring unit, And the reliability of the measured value output from the integrator is verified.
The method of claim 3,
Further comprising a storage unit for storing information on the output value of the light source, the temperature measured by the temperature measuring unit, the calculated value calculated by the calculating unit, and the measured values output from the photometer, in time series. Reliability evaluation device.
5. The method according to any one of claims 2 to 4,
Wherein the optical sensor measuring unit is connected to the optical sensor through the cable, and is connected in parallel with the photometer.
delete An optical integrator for diffusing and reflecting the light emitted from the light source, an optical sensor for receiving the light diffused and reflected by the integrating sphere, a photometer for measuring the intensity of light using the current value output from the optical sensor, And a cable for transmitting a current outputted from the sensor to the photometer, the reliability evaluation method for an integral spherical system for verifying the reliability of an integrating spherical system,
Adjusting an output of the light source;
Measuring a current value output from the optical sensor;
Calculating the intensity of light incident on the optical sensor using the measured current value;
Measuring a temperature around the integrating sphere system, a temperature of the light source, a temperature of the integrating sphere, and a temperature of the optical sensor;
Correcting the measured value input from the photosensor and the measured value output from the photometer using information about the measured temperature; And
And calculating a difference value between a calculated value obtained by calculating the intensity of light incident on the optical sensor and a measured value output from the photometer, and verifying the reliability of the measured value output from the photometer. A system reliability evaluation method.
8. The method of claim 7,
An optical sensor measuring unit for measuring an output value of the light source, a temperature around the integrating sphere system, a temperature of the light source, a temperature of the integrating sphere, a temperature of the optical sensor, and a current value output from the optical sensor Further comprising the step of storing the calculated value obtained by calculating the intensity of the light incident on the optical sensor using the measured current value and the measured value output from the photometer in a time series.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990045696A (en) * 1997-11-28 1999-06-25 모리시타 요이찌 Optical sensor device and signal processing circuit used therein
KR100497813B1 (en) * 2002-04-06 2005-07-01 (주)아텔스 A temperature compensated LED Traffic Signal Module Controller maintaining constant luminous intensity
KR101182822B1 (en) * 2011-03-29 2012-09-13 삼성전자주식회사 Inspection apparatus and method of light emitting device
KR101192263B1 (en) * 2010-12-03 2012-10-17 (주) 넥스트칩 Illumination sensing device and error detecting/correcting method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990045696A (en) * 1997-11-28 1999-06-25 모리시타 요이찌 Optical sensor device and signal processing circuit used therein
KR100497813B1 (en) * 2002-04-06 2005-07-01 (주)아텔스 A temperature compensated LED Traffic Signal Module Controller maintaining constant luminous intensity
KR101192263B1 (en) * 2010-12-03 2012-10-17 (주) 넥스트칩 Illumination sensing device and error detecting/correcting method thereof
KR101182822B1 (en) * 2011-03-29 2012-09-13 삼성전자주식회사 Inspection apparatus and method of light emitting device

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