Technology of LED Measurement and Spectrometer Analysis

LED is a highly competitive light source, having significantly advantages such as long life and high efficiency. Therefore, LED lighting has been increasingly used in the fields of lighting engineering. However, the different emitting mechanism of LEDs from conventional luminous devices results in the insufficiency of existing emission characterization and measurement methods, leading to higher requirements for LED measurement optical characteristics and the development of corresponding instruments. Consequently, systematic study of the measurements and data analysis of LED lighting devices is urgently needed.

LMS-6000 Portable CCD Spectroradiometer

Temperature sensitivity of LED emissive characteristics demands special instruments to measure the parameter to ensure the reliablity and consistence during LED operation. The best choice for this is to meet the manufacturer’s or standard set measurements at 25 ℃ or higher temperature with a unique discernment for LED spectral output. Tailored equipment to sample reliable output from multiple points of view and high measuring speed is required for LED measurements. As a consequence, special LED spectrophotometers with increased speed of measurements is necessary to sample on-time LED’s single-tone lighting. It becomes even more crucial because traditional optical spectrometers are insufficient to the needs of high measurements’ speed when pulse modulation gets utilized with LEDs. Hence, LED optical parameter testing correctly relies on having specialized LED spectrophotometer that meets the measurements requirements.

In addition, increased accuracy of LED measurements necessitates greater requisites for spectrophotometers, due to the wide spectrum bandgap between white LEDs and incandescent bulbs as well as the considerable divergence regarding colored LEDs. This calls for high spectral resolution, low stray light and highly linearity construction with spectrophotometers. Nevertheless, LED output’s color control sets even more rigorous expectations, most prominently through additional regulation of the incorporated R9 index, informed by international investigations to systematize colored difference values in assessment standards. The IES TM-24-13 established the equivalent luminance (EVE) concept supported by quantitative ratio (S/P) ascertains. This raises more numerous multivalue measurement prerequisites for the spectrophotometers to match these fresh regulations of color fidelity delivery.

Apps of LED measurement is based on spectrometer technology, which can be used for laboratory measurement, production line measurement, and scene measurement. The core requirement of the spectrometer is accuracy, compatibility, and speed. On average, laboratory bandwidth needs to be controlled at the range of 0.0-5nm or evenlower at a range of 10-3; the spectra Linear accuracy is at about 1%. Colorimetric and S/P values can be obtained by measurement. Industrial grade spectrometer must use integrating spheres and control terminals for quick and accurate operations. In addition, a hand-held spectrometer, with an LCD display unit, can be used for convenient irradiometry measurements in the field.

At present, spectrometer is revolutionizing in order to be more powerful and efficient; the two main objectives are to become smaller, lighter, with low electromagnetic interference and easy to use, meeting the needs in quality control, soil analysis, environmental monitoring, remote sensing geology, testing and etc. .; the second is to focus on the research and application of DIY spectroscopy and sample automatic analysis device. Currently, spectrrometers industry is also moving forward, trying to provide more practical, reliable and scientific techniques.

With the rapid development of modern economy, mechanical scan spectrometer technology was born, and its improvement and future path have attracted wide attention. Its advantages include fast scanning, more accurate measurement and less stray light. Currently, the development of the mechanical scan spectrometer is mainly focused on improving performance parameters, measurement accuracy, and working speed, as well as to force on enhancing bichromatic sprectometer accuracy for applications with detailed analysis and introducing low stray light properties.

As LED Lighting Technology’s relentlessly ascending,spectrometer is the cornerstone of its accurate measurement. Fast spectrometer devices can straddle quality inspection, development experiments, moreover, towards future, rapid spectrometer will become closer to portability and accuracy. At same time, applicable to increasing measurement areas, Shenzhou Digital Display Spectrometer grasping unique Stray Light Suppression Technology, Wide Dynamic Linearization technology and Precise Thermal Silde Array Detector, etc; it can still obtain low light source noise while achieving high accuracy: 0.3% full Dynamice Optical stableness;it is an optimum tester set of LED signal event.