激光杂志
激光雜誌
격광잡지
LASER JOURNAL
2014年
7期
84-86
,共3页
TDLAS%ARM7%激光器驱动
TDLAS%ARM7%激光器驅動
TDLAS%ARM7%격광기구동
TDLAS%ARM7%Laser driver
可调谐激光二极管吸收光谱技术(TDLAS)是一种利用激光二极管的波长扫描和电流调谐特性对气体进行测量的技术,具有高选择性、高分辨率、高反应速度、高灵敏度等优点。TDLAS检测系统通常基于谐波检测的原理,通过高频调制某个依赖于频率的信号,使其扫过待测气体的吸收峰,再以调制频率的倍频作为参考信号进行信号处理。为了满足TDLAS检测系统对激光器驱动的需要,本文以ARM7系列的LPC2138为主控器,通过将DAC8830产生的锯齿波扫描信号和AD9958产生的一路正弦调制信号进行叠加,来实现TDLAS检测系统激光器的驱动。
可調諧激光二極管吸收光譜技術(TDLAS)是一種利用激光二極管的波長掃描和電流調諧特性對氣體進行測量的技術,具有高選擇性、高分辨率、高反應速度、高靈敏度等優點。TDLAS檢測繫統通常基于諧波檢測的原理,通過高頻調製某箇依賴于頻率的信號,使其掃過待測氣體的吸收峰,再以調製頻率的倍頻作為參攷信號進行信號處理。為瞭滿足TDLAS檢測繫統對激光器驅動的需要,本文以ARM7繫列的LPC2138為主控器,通過將DAC8830產生的鋸齒波掃描信號和AD9958產生的一路正絃調製信號進行疊加,來實現TDLAS檢測繫統激光器的驅動。
가조해격광이겁관흡수광보기술(TDLAS)시일충이용격광이겁관적파장소묘화전류조해특성대기체진행측량적기술,구유고선택성、고분변솔、고반응속도、고령민도등우점。TDLAS검측계통통상기우해파검측적원리,통과고빈조제모개의뢰우빈솔적신호,사기소과대측기체적흡수봉,재이조제빈솔적배빈작위삼고신호진행신호처리。위료만족TDLAS검측계통대격광기구동적수요,본문이ARM7계렬적LPC2138위주공기,통과장DAC8830산생적거치파소묘신호화AD9958산생적일로정현조제신호진행첩가,래실현TDLAS검측계통격광기적구동。
Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a technique used in gas detection based on the laser’s characteristics of wavelength scanning and current tuning. It has high selectivity, high resolution, high sensitivity and fast reaction speed. The TDLAS detection system is based on the principle of the harmonic detection. The principle is a technique making a signal modulated by a high frequency one scanning for the absorption peak of the gas to be detected, and then processing the detected signal using double frequency of the modulation signal as the reference. In this paper, we designed a laser driver circuit for the TDLAS detection system using the LPC2138 micro-controller as the main controller, using the DAC8830 to produce a sawtooth signal, and using the AD9958 to produce a sine-wave modulation signal.