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01 Jul, 2022 855 Views Author: Cherry Shen

SSL photometric measurement difference between goniophotometer and integrating sphere

What is solid-state lighting product (SSL) measuring
SSL includes LED and oled With the elimination of incandescent lamps and the gradual withdrawal of high-pressure mercury lamps, the scope of traditional lighting has narrowed. At present, it mainly includes tungsten halogen lamps, fluorescent lamps, high-pressure sodium lamps, metal halide lamps and other light sources and their supporting electrical appliances and lamps LED does not contain harmful luminous substances such as mercury, and its luminous efficiency, service life and luminous flux maintenance rate are all higher than those of traditional light sources. Therefore, its advantages in energy conservation and environmental protection have been recognized by everyone Therefore, LED lamps are widely used, and the demand for detecting LED lamps is also increasing. It has a professional integrating sphere for measuring luminous flux and chromaticity parameters of light sources and a distribution photometer for measuring angle related characteristics of LED and solid-state lighting products.

Working principle of Goniophotometer
The Goniophotometer is the main measuring equipment for testing the Photometric Performance of lamps. It can be used to measure the spatial light intensity distribution, total light flux, lamp efficiency and other parameters of lamps or light sources The Goniophotometer system consists of precision turntable and control system, spectral analysis system, standard lamp, alignment system, computer processing system, etc The Goniophotometer needs to be used with a large darkroom, Use low reflectivity materials in the room to avoid reflected light entering the probe Because the measuring system is susceptible to ambient temperature.

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Test method of Goniophotometer
1. Double column structure (b- β And a- α Plane coordinate system) is mainly used for measuring projection lamps, etc. When installing the lamp, make the luminous center of the lamp consistent with the rotating center of the rotating workbench. At B- β In the coordinate system, the lamp axis coincides with the horizontal axis of the rotating workbench. At a- α In the coordinate system, the lamp axis is perpendicular to the horizontal axis of the rotating workbench.
2. Single column structure (c- γ Plane coordinate system and conical coordinate system) are mainly used to measure down lights, grid lights and other lamps. When installing the lamp, make the luminous center of the lamp consistent with the rotating center of the rotating workbench. The optical axis of the lamp coincides with the horizontal axis of the rotating workbench.

The basic principle of the integrating sphere
The light is collected by the Integrating sphere through the sampling port, and is evenly scattered inside the Integrating sphere after multiple reflections When the Integrating sphere is used to measure luminous flux, the measurement results can be more reliable. The Integrating sphere can reduce and eliminate the measurement errors caused by the shape of the light, the divergence angle, and the difference in the responsiveness of different positions on the detector.

Measuring principle of integrating sphere
In the process of light source testing, the main function of Integrating sphere is to act as a light collector, which is an important component equipment of photometric measurement system. Integrating sphere is a hollow sphere. The shell is generally made of metal plate by piece welding or overall spinning, and the inner wall is sprayed with reflective paint Because the energy band gap of the coating material on the inner wall of the Integrating sphere is very high, it can hardly absorb the light energy, so there is no light loss When the measured light source is installed at the center of the Integrating sphere, the light is evenly distributed on the inner wall of the sphere after multiple reflections and diffuse reflections By measuring the light energy of a small area on the inner wall of the integrating sphere, the total light energy emitted by the light source can be calculated According to the different photometric measuring equipment, the Integrating sphere measuring system is divided into Integrating sphere photometer measuring system and Integrating sphere spectral analysis system The former uses the photometric probe as the detector and cooperates with the photometer to measure the optical parameters; The latter uses optical fiber to collect the light from the spherical wall, and cooperates with the spectrometer to measure the luminosity, chromaticity, radiance and other parameters.

Integrating sphere 4 π and integrating sphere 2 π two test methods
1. Integrating sphere 4 π measurement method: the tested light source is installed in the center of the Integrating sphere, so that the light is emitted to all sides With this measurement method, the sample installation is simple and the time for changing the sample is short, but the influence of self absorption effect should be considered
2. Integrating sphere 2 π measurement method: the measured light source is installed on the opening of the spherical wall at the side of the Integrating sphere, allowing the light to enter the Integrating sphere from the outside This measurement method does not need to consider the effect of self absorption, but needs to be equipped with an aperture reduction device to adapt to different sizes of samples.

The Photometric Performance Parameters of LED lighting products can be measured by Goniophotometer orIntegrating sphere system, or can be used together Which method to choose depends on the optical characteristics to be measured, product size and other requirements In general, the Integrating sphere system equipped with auxiliary lamps is suitable for measuring the optical characteristic parameters of integrated LED lamps and relatively small LED lamps The advantages of Integrating sphere system test are fast measurement and no darkroom is required The Goniophotometer provides a method for measuring light intensity distribution and total luminous flux. It can measure relatively large LED lighting products Pay attention to the requirements of test environment. Air flow may affect the measurement of LED lighting products that are sensitive to temperature Pay attention to correct clamping and positioning when using the Goniophotometer method High precision spectral radiation installed on a Goniophotometer is the spatial distribution of light intensity measured directly without mirror reflection Compared withIntegrating sphere, it takes more time to measure with distributed photometer On the premise of correct test methods, the Photometric Performance Parameters of LED lighting products can be accurately measured through reasonable selection of detection methods, providing data support for scientific evaluation of the performance quality status and development trend of LED lighting products.

Therefore, LISUN Launched LSG-6000 Moving Detector Goniophotometer (Mirror Type C) was manufactured by LISUN completely meets LM-79-19, IES LM-80-08COMMISSION DELEGATED REGULATION (EU) 2019/2015CIE-121, CIE S025, SASO 2902, IS16106 and EN13032-1 clause 6.1.1.3 type 4 requirements. LSG-6000 is the latest upgraded product of LSG-5000 and LSG-3000 in compliance with the requirements of the LM-79-19 standard Clause 7.3.1, its an automatic light distribution intensity 3D curve testing system for measuring light. The measuring distance is from 5m to 30m.

Measurement:
Luminous Intensity Data, Photometric Data, Luminous Intensity Distribution, Zonal Luminous Flux, Luminaries Efficiency, Luminance Distribution, Coefficient Of Utilization, Luminance Limitation Curves Glare, Maximum Ratio of Distance to Height, Equal Illuminance Diagrams, Curves of Luminaires VS Lighting Area, Isocandela Diagrams, Efficient Luminescence Angle, EEI, UGR, etc. 

LM-79 Moving Detector Goniophotometer (Mirror Type C)

LM-79 Moving Detector Goniophotometer (Mirror Type C)

LSG-1890B/LSG-1800A goniophotometer is automatic goniophotometric instrument for luminous intensity distribution measurements with facility for rotating the light source. The LSG-1890B/LSG-1800A uses a constant temperature detector, Japanese motor and German precision angle coder which keep the test results with high accuracy. It is for industrial laboratory photometric data measurement of all kinds of luminaries such as LED luminaries, HID lamps, fluorescent lamps and so on.

Luminous Intensity Data, Luminous Intensity Distribution, Zonal Luminous Flux, Luminaries Efficiency,Luminance Distribution,Coefficient Of Utilization, Luminance Limitation Curves Glare, Maximum Ratio of Distance to Height, Equal Illuminance Diagrams, Curves of Luminaires VS Lighting Area, Isocandela Diagrams, Efficient Luminescence Angle, EEI, UGR, etc.

SSL photometric measurement difference between goniophotometer and integrating sphere

High Precision Rotation Luminaire Goniospectroradiometer LSG-1890B

LPCE-2 Integrating Sphere Spectroradiometer LED Testing System is for single LEDs and LED lighting products light measurement. LED’s quality should be tested by checking its photometric, colorimetric and electrical parameters. According to CIE 177CIE84,  CIE-13.3IES LM-79-19Optical-Engineering-49-3-033602COMMISSION DELEGATED REGULATION (EU) 2019/2015IESNA LM-63-2 and ANSI-C78.377, it recommends to using an array spectroradiometer with an integrating sphere to test SSL products. The LPCE-2 system is applied with LMS-9000C High Precision CCD Spectroradiometer or LMS-9500C Scientific Grade CCD Spectroradiometer, and A molding integrating sphere with holder base. This sphere is more round and the test result is more accruacy than the traditional integrating sphere.

Measures:
• Colorimetric: Chromaticity coordinates, CCT, Color Ratio, Peak Wavelength, Half Bandwidth, Dominant Wavelength, Color Purity, CRI, CQS, TM-30 (Rf, Rg), Spectrum Test
• Photometric: Luminous Flux, Luminous Efficiency, Radiant Power, EEI, Energy Efficiency Class, Pupil Flux, Pupil Flux Efficiency, Pupil Factor, Cirtopic Flux, Plant Growth Lamp PAR and PPF
• Electrical: Voltage, Current, Power, Power Factor, Displacement Factor, Harmonic
• LED optical maintenance test: Flux VS time, CCT VS time, CRI VS time, Power VS time, Power Factor VS time, Current VS time and Flux Efficiency VS time.

LPCE-2(LMS-9000)High Precision Spectroradiometer Integrating Sphere System

LPCE-2(LMS-9000)High Precision Spectroradiometer Integrating Sphere System

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are GoniophotometerIntegrating SphereSpectroradiometerSurge GeneratorESD Simulator GunsEMI ReceiverEMC Test EquipmentElectrical Safety TesterEnvironmental ChamberTemperature ChamberClimate ChamberThermal ChamberSalt Spray TestDust Test ChamberWaterproof TestRoHS Test (EDXRF)Glow Wire Test and Needle Flame Test.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997

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