摘要
光电高温计的非线性是复现和传递国际温标的主要不确定度贡献项之一。基于光通量倍增原理,采用中心波长645nm的高亮度发光二极管(LED)光源,建立了新的光电高温计非线性测量系统。利用LED开关供电方式,取消光闸门设计,避免了光路多次反射引入的非理想性。实验研究了阶跃电流供电条件下LED光源的光谱辐射亮度漂移特性,确定了不同供电电流下的初始非线性漂移的结束时间。设计了具有固定相位差的双LED脉冲供电电流和半透半反双光源亮度叠加方案。选择LED线性漂移阶段测量光电高温计的非线性,利用测量序列互换模型消除两LED线性漂移差异的影响,并进行了实验验证。实验测量了用于温标传递的光电高温计RT9032的非线性特性。
Nonlinearity of photoelectric pyrometer is one of the main uncertainty sources for realization of international temperature scale.A novel nonlinearity measurement system based on light-emitting diode（LED）light sources and flux addition method is established.A high-brightness LED with nominal 645 nm peak wavelength is utilized as light source to substitute conventional tungsten lamp.The switch of power supply for LED can realize flux addition,and the abandonment of optical strobe can avoid the nonideal result from repeated reflection.The experimental research on the spectral radiation drift of LED under step-mode power supply is carried out to validate the end time of nonlinear drift stage.The pulse-mode power supply of fixed phase shift for double LEDs and beam splitter are combined to attain flux addition.The linear drift stage of LED is chosen to measure the nonlinearity of pyrometer.The linear drift effect on the nonlinearity measurement is eliminated by exchange the measurement turn and experiments are carried out to validate the method.The nonlinearity of the standard radiation thermometer（model RT9032）is experimentally studied.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第8期2412-2416,共5页
Acta Optica Sinica
基金
国家科技支撑计划(2006BAF06B03)资助课题
关键词
光学测量
国际温标
光通量倍增
非线性
光电高温计
optical measurement
international temperature scale
flux addition
nonlinearity
radiation thermometer
作者简介
董伟（1981-），男，硕士，助理研究员，主要从事辐射测温和材料热物性等方面的研究。E—mail：dongw@nim．ac．cn
