CAJ | 학술논문

为了实时检测空气中 NO2的浓度，采用差分检测与内调制技术相结合的方法设计了一套激光 NO2检测系统。该系统采用波长为450 nm 的蓝光激光器作为光源，这是根据 NO2吸收峰特点选取的。采用光源内调制技术，通过 TTL 调制驱动电流实现对输出光强及其频率的调制。在常温常压下，对 NO2浓度进行了测量，并用最小二乘法对实验数据进行了处理。结果表明，实验系统的最低浓度检测极限是6 ppm，拟合系数 R2为0．9996。
위료실시검측공기중 NO2적농도，채용차분검측여내조제기술상결합적방법설계료일투격광 NO2검측계통。해계통채용파장위450 nm 적람광격광기작위광원，저시근거 NO2흡수봉특점선취적。채용광원내조제기술，통과 TTL 조제구동전류실현대수출광강급기빈솔적조제。재상온상압하，대 NO2농도진행료측량，병용최소이승법대실험수거진행료처리。결과표명，실험계통적최저농도검측겁한시6 ppm，의합계수 R2위0．9996。
A nitrogen dioxide (NO2 )detecting system based on laser internal modulation and differential detection was designed in order to real-time monitor NO2 concentration in the air.According to the characteristics of NO2 ab-sorption peak,the blue laser operating at 450nm was selected as the light source.The internal modulation technology was used,and the output light intensity and frequency were controlled through modulating the drive current by TTL (Transistor-Transistor Logic).The NO2 concentration was measured at room temperature and atmospheric pressure, and experimental data were processed with the least square method.The results show that the detection limit of the system is 6ppm and a fitting coefficient is 0.9996.