Research On The Measurement System Of LED

LED was a new light source to express a lot of characteristics and advantages for possessing singly, the recent years acquired extensive application and huge development. More LED lighting was listed as "the economy energy reduces a row" particularly item topic.Hereat in the meantime. LED its function evaluation and diagraph problem is also gradually outstanding.This text examines a technique and combines a data to collect principle according to domestic and international LED and developed LED parameter test device, mainly did following several workses:1,Gave out light mechanism and characteristic parameter to do simple introduction to LED first.According to international lighting committee(CIE) in1997and recommend in2003of concerning LED intensity of light color degree characteristic diagraph and evaluation method, put forward the overall design way of thinking of test device.2.Studied the work mechanism of the Huo optoelectronics diode, analyzed its Zao the source of voice creation in detail, and as to it’s one by one processing, measures accuracy by exaltation, and depend on this photometer that developed according to the single slice of machine and the string correspondence.3,This text developed an instrument according to CPLD and in general use string of spectrum test that goes total line(USB) correspondence.This text studied CCD work principle in detail and made use of CPLD to have an achievement to consume low, quick speed, the Hang interference strong characteristics, can let up physical volume and exaltation of electric circuit to work the characteristics of frequency, put forward with CPLD produces CCD to drive the synchronous signal that signal and the whole spectrum measure system of method.4,Because USB connected to have to adopt to have higher deliver speed and support plug-and-play and heat’s putting to pull out, and host power supply etc. advantage, this selected works settles to use it as the top and bottom machine communication to connect, and pass the method of strict control power, attain usage USB the purpose of the power supply.5,This text with the VC++6.0wrote the place of honor machine test software of test system, carried out LED the optical parameter tests of each mold piece.This text emphasizes to elaborate test device in detail of science of electricity hardware the design and software design principle and realization and finally carried on a mark to the system settle, give test result.This text source item has already passed acceptance currently, the devotion uses.LED of this text research parameter test the device rely on national defense optics to calculate a class station, can promote LED function evaluation and diagraph of the norm turn. scientific.