光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2010年
1期
283-286
,共4页
光纤光栅%传感器%钢筋%监测%腐蚀
光纖光柵%傳感器%鋼觔%鑑測%腐蝕
광섬광책%전감기%강근%감측%부식
Optical fiber grating%Sensor%Reinforcing steel%Monitoring%Corrosion
钢筋腐蚀是导致钢筋混凝土结构耐久性劣化的最重要因素之一.钢筋腐蚀将导致钢筋体积大大增加,混凝土保护层开裂、剥落,结构承载力下降,甚至倒塌.基于光纤布拉格光栅应变传感器的原理,根据钢筋腐蚀体积膨胀,提出了一种新的钢筋腐蚀光纤光栅传感器及温度补偿方法.传感器构造是在两根紧靠的钢筋中心附近粘贴光纤光栅,由于钢筋腐蚀体积膨胀,钢筋直径增加将转变成布拉格光纤光栅的应变,从而实现对钢筋腐蚀程度及速率的监测.传感器的监测原理是设置一个钢筋腐蚀光纤光栅传感器来监测由于钢筋腐蚀和温度变化引起的光栅应变,同时单独设置一个不锈钢光纤光栅传感器来测量温度引起的光栅应变.这两个光纤光栅传感器的应变监测,可分离出钢筋由于腐蚀所引起的体积变化.在混凝土结构中埋入封装的传感器,通过监测光纤光栅波长的漂移可以直接测量钢筋腐蚀程度,而且不受腐蚀因素的影响,可用于混凝土结构中钢筋腐蚀的早期监测.最后通过实验标定了钢筋腐蚀率与光栅波长位移的关系.
鋼觔腐蝕是導緻鋼觔混凝土結構耐久性劣化的最重要因素之一.鋼觔腐蝕將導緻鋼觔體積大大增加,混凝土保護層開裂、剝落,結構承載力下降,甚至倒塌.基于光纖佈拉格光柵應變傳感器的原理,根據鋼觔腐蝕體積膨脹,提齣瞭一種新的鋼觔腐蝕光纖光柵傳感器及溫度補償方法.傳感器構造是在兩根緊靠的鋼觔中心附近粘貼光纖光柵,由于鋼觔腐蝕體積膨脹,鋼觔直徑增加將轉變成佈拉格光纖光柵的應變,從而實現對鋼觔腐蝕程度及速率的鑑測.傳感器的鑑測原理是設置一箇鋼觔腐蝕光纖光柵傳感器來鑑測由于鋼觔腐蝕和溫度變化引起的光柵應變,同時單獨設置一箇不鏽鋼光纖光柵傳感器來測量溫度引起的光柵應變.這兩箇光纖光柵傳感器的應變鑑測,可分離齣鋼觔由于腐蝕所引起的體積變化.在混凝土結構中埋入封裝的傳感器,通過鑑測光纖光柵波長的漂移可以直接測量鋼觔腐蝕程度,而且不受腐蝕因素的影響,可用于混凝土結構中鋼觔腐蝕的早期鑑測.最後通過實驗標定瞭鋼觔腐蝕率與光柵波長位移的關繫.
강근부식시도치강근혼응토결구내구성열화적최중요인소지일.강근부식장도치강근체적대대증가,혼응토보호층개렬、박락,결구승재력하강,심지도탑.기우광섬포랍격광책응변전감기적원리,근거강근부식체적팽창,제출료일충신적강근부식광섬광책전감기급온도보상방법.전감기구조시재량근긴고적강근중심부근점첩광섬광책,유우강근부식체적팽창,강근직경증가장전변성포랍격광섬광책적응변,종이실현대강근부식정도급속솔적감측.전감기적감측원리시설치일개강근부식광섬광책전감기래감측유우강근부식화온도변화인기적광책응변,동시단독설치일개불수강광섬광책전감기래측량온도인기적광책응변.저량개광섬광책전감기적응변감측,가분리출강근유우부식소인기적체적변화.재혼응토결구중매입봉장적전감기,통과감측광섬광책파장적표이가이직접측량강근부식정도,이차불수부식인소적영향,가용우혼응토결구중강근부식적조기감측.최후통과실험표정료강근부식솔여광책파장위이적관계.
Based on the principle of the fiber Bragg grating strain sensor as well as the volume expansion of the reinforcing steel due to corrosion, an optical fiber grating sensor for monitoring corrosion of reinforcing steel and the method of temperature compensation were studied in the present paper. The sensor construction is that one Bragg grating is stuck on the inner center of two bars against each other, and the reinforcement volume as well as the diameter will expand due to corrosion. Based upon sensing mechanism, monitoring will be carried out by transforming the diameter increase to the fiber strain, and as a result the degree and rate of reinforcement corrosion can be obtained. The principle of corrosion monitoring is that the strain induced by corrosion and temperature fluctuation is measured by a reinforcing steel fiber grating sensor. At the same time, the strain induced by temperature fluctuation is also measured by an individual stainless fiber grating sensor. Therefore by two independent fiber grating sensors, the volume changed by corrosion can be separated. By the concrete encapsulating and embedding method of FBG corrosion sensor, the degree of corrosion of reinforcing reinforcement will be measured directly, which is not affected by corrosion factors and can be used in the early corrosion monitoring of reinforcement in concrete structures. Finally the relationship between corrosion rate and shift in center wavelength was calibrated by experiment