采用食人鱼系列的发光二极管(light em itting d iodes,简称LED)作光源,进行枕型透镜与反射腔的设计,在结构软件Catia中建立了一款后位灯的三维模型,并利用光学软件T raceP ro进行光学效果的仿真,开发出了一款LED后位灯。样品经汽车灯...采用食人鱼系列的发光二极管(light em itting d iodes,简称LED)作光源,进行枕型透镜与反射腔的设计,在结构软件Catia中建立了一款后位灯的三维模型,并利用光学软件T raceP ro进行光学效果的仿真,开发出了一款LED后位灯。样品经汽车灯具测试中心检测,性能满足国家标准要求。展开更多
Light emitting diode(LED)lighting is becoming more and more popular,as incandescent lamps are being phased out globally.LEDs have several advantages over incandescent lamps,including energy efficiency,robustness,long ...Light emitting diode(LED)lighting is becoming more and more popular,as incandescent lamps are being phased out globally.LEDs have several advantages over incandescent lamps,including energy efficiency,robustness,long lifetime,and good temporal stability.The three latter features make LEDs attractive candidates as new photometric standards.Because the spectra of white LEDs are limited to the visible wavelength range,a novel method for the realization of photometric units based on the predictable quantum efficient detector(PQED)can be utilized.The method eliminates the need of photometric filters that are traditionally used in photometry,and instead relies on carrying out the photometric weighting numerically based on the measured relative spectrum of the source.The PQED-based realization simplifies the traceability chain of photometric measurements significantly as compared with the traditional filter-based method.The measured illuminance values of a white LED deviate by only 0.03%when determined by the new and the traditional methods.The new PQED method has significantly lower expanded uncertainty of 0.26%(k=52)as compared with that of the traditional filter-based method of 0.42%(k=52).Furthermore,when filtered photometers that measure LED lighting are calibrated using LED lamps as calibration sources instead of incandescent lamps,a significant decrease in the uncertainty related to the spectral mismatch correction can be obtained.The maximum spectral mismatch errors of LED measurements decreased on average by a factor of 3 when switching from an incandescent lamp to an LED calibration source.展开更多
文摘采用食人鱼系列的发光二极管(light em itting d iodes,简称LED)作光源,进行枕型透镜与反射腔的设计,在结构软件Catia中建立了一款后位灯的三维模型,并利用光学软件T raceP ro进行光学效果的仿真,开发出了一款LED后位灯。样品经汽车灯具测试中心检测,性能满足国家标准要求。
基金The research leading to these results has received partial funding from the European Metrology Research Programme(EMRP)project SIB57‘New Primary Standards and Traceability for Radiometry’The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.
文摘Light emitting diode(LED)lighting is becoming more and more popular,as incandescent lamps are being phased out globally.LEDs have several advantages over incandescent lamps,including energy efficiency,robustness,long lifetime,and good temporal stability.The three latter features make LEDs attractive candidates as new photometric standards.Because the spectra of white LEDs are limited to the visible wavelength range,a novel method for the realization of photometric units based on the predictable quantum efficient detector(PQED)can be utilized.The method eliminates the need of photometric filters that are traditionally used in photometry,and instead relies on carrying out the photometric weighting numerically based on the measured relative spectrum of the source.The PQED-based realization simplifies the traceability chain of photometric measurements significantly as compared with the traditional filter-based method.The measured illuminance values of a white LED deviate by only 0.03%when determined by the new and the traditional methods.The new PQED method has significantly lower expanded uncertainty of 0.26%(k=52)as compared with that of the traditional filter-based method of 0.42%(k=52).Furthermore,when filtered photometers that measure LED lighting are calibrated using LED lamps as calibration sources instead of incandescent lamps,a significant decrease in the uncertainty related to the spectral mismatch correction can be obtained.The maximum spectral mismatch errors of LED measurements decreased on average by a factor of 3 when switching from an incandescent lamp to an LED calibration source.
