Integrating Sphere: Introduction & Cost Effective Solutions

Principle of Integrating Sphere Spectroradiometer System:
The light emitted by the lamp is ejected on the inner wall of the integrating sphere. After multiple reflection of the surface of the inner wall with a manifestation of a mansion, it is used to form a uniformly illuminated light and then enters the spectrum radiation meter to form test data. Therefore, there may be several reasons that affect the test data when using the integrating sphere testing light flux:
• Different distribution of standard lights and measuring sources will cause deviations. The larger the angle is, the greater the deviation.
• Standard lamps are different from the size of the lamp.
• The adsorption of the appearance color of the tested lamp will reduce the reflection light, and cause deviation.
• Reflex after a long period of use of the integrating sphere.

Test Method of integrating sphere spectroradiometer system:
1. spectral lighting method
The metering source measured by the metering source using the optical flux and the spectral method measured by the metering source.

In short, the optical flux measurement of optical method is to compare the standard lamps (quantitative values traced back to the Chinese measurement institute) in the integrating sphere in the integrating sphere).

The basic principle of optical flux measurement is to place the test lamp in the integrating sphere, and apply a white man -in reflector on the inner wall of the integrating sphere (the spectrum reflectance is ≥0.98 or more). The illuminance on the wall is evenly distributed, and then the light flux projected to the optoelectronics detector through the holes on the sphere wall should be proportional to the total optical flux emitted by the light source. In order to make the relative spectral sensitivity of the optoelectronics detector on the sphere wall conforms to the spectral light vision of the human eye, the method of adding a filter set is generally used to modify. By calculating the spread and conditions of the lighting glass group, according to the typical transmission ratio characteristic curve of the type of colorful glass types, select the color glass group with a suitable match curve, and then calculate the various glass required for the matching curve based on the formula. Appropriate thickness, finally modify the optical value.

2. Full spectral method
In terms of measurement, the full spectral method requires that the absolute spectrum power distribution corresponding to the absolute spectrum power corresponding to the wavelength of 5nm. Distribution, at the same time, calibrate the optical flux. After the corresponding absolute spectrum power distribution of each wavelength, the absolute spectrum power distribution list is made into a software readable standard lamp absolute spectrum power distribution data, which can remove the optoelectronic detection on the sphere port. The measuring device is directly connected to the inner port of the sphere wall from the fiber, and the other end of the fiber is connected to the incident slit of the spectral analyzer. The light guide into the grating monochrome can be tested to the ratio of the light power corresponding to the standard lights in each wavelength. The absolute spectral power distribution of the lamp. According to the conversion formula of the radiation volume and light weight, the optical flux of the standard light and to be tested is calculated by the absolute spectral power distribution. Pole differences, related color temperature, color rendering index and other photoelectric parameters.

LISUN Test Solution:
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 177, CIE84,  CIE-13.3, IES LM-79-19, Optical-Engineering-49-3-033602, COMMISSION DELEGATED REGULATION (EU) 2019/2015, IESNA LM-63-2, IES-LM-80 and ANSI-C78.377, it recommends to using an array spectroradiometer with an integrating sphere to test SSL products.

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 Light Decay Test according to LM-80: Flux VS time, CCT VS time, CRI VS time, Power VS time, Power Factor VS time, Current VS time and Flux Efficiency VS time.

First of all, you need to do the following steps before the test:
1. Check the connection of all equipment and confirm that all the connection is correct and safe (the connection here includes the connection between the equipment and the equipment and the power supply supply);
2. Open the computer software and set related parameters (such as fixed data and parameters needed);
3. Install the standard lamp in the correct position in the integrating sphere. Please follow the laboratory operation standards;
4. After installing the standard lamp, turn on the DC power supply, and enter the software in the setting of the standard lamp calibration report one by one. After confirming, click to start the preheating standard lamp. After the calibration process is successful, turn off the DC power supply and remove the standard lamp, and switch the power to AC power supply;
5. Install the lamp (please note that the type of lamps. If the lamp is tested, it is a lamp that shines around, such as LED sphere bubble lamps, CFL energy -saving lamps, etc. The lamp measurement is directed, such as street lights, LED panel lights, etc., it is best to install the lamp on the position of the integrating sphere opening to do 2π test), install it after being installed, turn on the AC power supply and set it in the test software. The lighting time of the lamp is usually stabilized for the LED light source output for about 10 minutes;
6. After the preheating, the software will automatically analyze and calculate the corresponding data. At this time, the software interface will display the test results and print out the test report;
7. After completing the above actions, you need to turn off the power and total control power switch of each instrument;

Tags：LPCE-2 (LMS-9000)