光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
7期
1774-1779
,共6页
邵杰%韩叶星%郭杰%王理明%韩影%应朝福%王尧
邵傑%韓葉星%郭傑%王理明%韓影%應朝福%王堯
소걸%한협성%곽걸%왕리명%한영%응조복%왕요
TDLAS%波长调制%SG-DBR%二次谐波检测
TDLAS%波長調製%SG-DBR%二次諧波檢測
TDLAS%파장조제%SG-DBR%이차해파검측
TDLAS%Wavelength modulation%SG-DBR%Second-harmonic detection
可调谐半导体激光吸收光谱作为一种高灵敏度、高选择性、非侵入的痕量气体实时检测技术,已在大气监测、工业控制等方面得到广泛应用。采用一种新型宽带可调谐的SG-DBR半导体激光器(可调谐范围1520~1570 nm )作光源,并通过自编程序对该激光器设定了18个通道,输出波长分别对应CO ,CO2以及H2 O的吸收谱线中心位置,设计和构建了一个基于近红外可调谐半导体激光吸收光谱的多组分气体光谱测量系统,描述了相关的光学系统设置,结合波长调制(w m )的二次谐波技术测量其中14个通道(分别对应CO和CO2的吸收谱线)的吸收光谱,系统获得的CO和CO2峰值吸收探测极限能够达到10-5。实验结果验证了SG-DBR激光器在波长调制吸收光谱多组分气体检测领域的可行性。在实际应用过程中使用单个SG-DBR激光器可以实现多组分气体的同时测量,有效降低设备成本和系统复杂性。
可調諧半導體激光吸收光譜作為一種高靈敏度、高選擇性、非侵入的痕量氣體實時檢測技術,已在大氣鑑測、工業控製等方麵得到廣汎應用。採用一種新型寬帶可調諧的SG-DBR半導體激光器(可調諧範圍1520~1570 nm )作光源,併通過自編程序對該激光器設定瞭18箇通道,輸齣波長分彆對應CO ,CO2以及H2 O的吸收譜線中心位置,設計和構建瞭一箇基于近紅外可調諧半導體激光吸收光譜的多組分氣體光譜測量繫統,描述瞭相關的光學繫統設置,結閤波長調製(w m )的二次諧波技術測量其中14箇通道(分彆對應CO和CO2的吸收譜線)的吸收光譜,繫統穫得的CO和CO2峰值吸收探測極限能夠達到10-5。實驗結果驗證瞭SG-DBR激光器在波長調製吸收光譜多組分氣體檢測領域的可行性。在實際應用過程中使用單箇SG-DBR激光器可以實現多組分氣體的同時測量,有效降低設備成本和繫統複雜性。
가조해반도체격광흡수광보작위일충고령민도、고선택성、비침입적흔량기체실시검측기술,이재대기감측、공업공제등방면득도엄범응용。채용일충신형관대가조해적SG-DBR반도체격광기(가조해범위1520~1570 nm )작광원,병통과자편정서대해격광기설정료18개통도,수출파장분별대응CO ,CO2이급H2 O적흡수보선중심위치,설계화구건료일개기우근홍외가조해반도체격광흡수광보적다조분기체광보측량계통,묘술료상관적광학계통설치,결합파장조제(w m )적이차해파기술측량기중14개통도(분별대응CO화CO2적흡수보선)적흡수광보,계통획득적CO화CO2봉치흡수탐측겁한능구체도10-5。실험결과험증료SG-DBR격광기재파장조제흡수광보다조분기체검측영역적가행성。재실제응용과정중사용단개SG-DBR격광기가이실현다조분기체적동시측량,유효강저설비성본화계통복잡성。
Tunable diode laser absorption spectroscopy (TDLAS) is a highly sensitive ,highly selective ,noninvasive and real-time trace gas detection technique ,which has been widely used in atmospheric monitoring and industrial control .In the present research ,a new type of widely tunable SG-DBR diode laser (WTDL) with a tunable range of about 1 520~1 570 nm was use as the light source for tunable diode laser absorption spectroscopy combined with the wavelength modulation (wm) to measure the spectrum of multi-gases .Also the structure ,performance and other characteristics of WTDL were introduced .There were 18 channels compiled to the SG-DBR laser ,which emitted central wavelength at the optimum absorption transitions of CO ,CO2 and H2O by homemade program ,of which 14 channels (corresponding to absorption lines of CO and CO2 ) were investigated by sec-ond harmonic detection technique .Meanwhile ,the detectabilities in these channel were analyzed which are about 10-5 at the peak absorbance .The experiment results validate the feasibility of SG-DBR laser used as light source in multi-gases detection using wavelength modulation absorption spectroscopy technique in practical application .That could effectively reduce the cost and com-plexity of system in the field of TDLAS technique .