CAJ | 학술논문

可调谐二极管激光吸收光谱技术（TDLAS）具有高分辨率、高灵敏度和快速测量等特点，是气体探测中的主流技术。使用多模二极管激光器作为光源，将多模二极管激光吸收光谱技术与关联光谱技术相结合有助于提高测试可靠性和稳定性，同时还可有效解决单模二极管激光器长时间工作时中心波长随外界温度或机械特性的变化而发生偏移的问题。以1570 nm多模二极管激光器为光源，利用多模二极管激光关联光谱和波长调制的气体测量技术（TMDL-COSPEC-WMS），通过计算待测气体和参考池气体之间二次谐波信号峰值高度之间的关系，实现了对二氧化碳浓度的测量。实验中二氧化碳浓度测量范围在0.6％～30％之间，计算结果表明，二氧化碳浓度与真实浓度值之间具有良好的线性关系，其线性度为0.9987，线性拟合的斜率为1.061±0.0168。对二氧化碳与氮气混合气体的连续测量结果表明，系统的探测极限达到335 ppm · m ，对同一样品在20 min内的20次连续测量的标准偏差为0.0367％，表明了系统良好的稳定性，所有测量结果都显示了系统用于二氧化碳气体监测的有效性。
가조해이겁관격광흡수광보기술（TDLAS）구유고분변솔、고령민도화쾌속측량등특점，시기체탐측중적주류기술。사용다모이겁관격광기작위광원，장다모이겁관격광흡수광보기술여관련광보기술상결합유조우제고측시가고성화은정성，동시환가유효해결단모이겁관격광기장시간공작시중심파장수외계온도혹궤계특성적변화이발생편이적문제。이1570 nm다모이겁관격광기위광원，이용다모이겁관격광관련광보화파장조제적기체측량기술（TMDL-COSPEC-WMS），통과계산대측기체화삼고지기체지간이차해파신호봉치고도지간적관계，실현료대이양화탄농도적측량。실험중이양화탄농도측량범위재0.6％～30％지간，계산결과표명，이양화탄농도여진실농도치지간구유량호적선성관계，기선성도위0.9987，선성의합적사솔위1.061±0.0168。대이양화탄여담기혼합기체적련속측량결과표명，계통적탐측겁한체도335 ppm · m ，대동일양품재20 min내적20차련속측량적표준편차위0.0367％，표명료계통량호적은정성，소유측량결과도현시료계통용우이양화탄기체감측적유효성。
Tunable diode laser absorption spectroscopy (TDLAS) technology is a kind of fast time response ,large-range ,contin-uous on-line monitoring gas detection technique .It is the mainstream technology of gas detection .In this paper the multimode la-ser diode was used as light source .Multi-mode laser combined with correlation spectroscopy can improve the test reliability and stability .It can also conquer the problem of the central wavelength change of the single mode diode laser due to thermal or me-chanical fluctuations in durable working process .A FP laser was used as the light source in this research .A multi-mode diode la-ser system based on correlation spectroscopy and wavelength modulation spectroscopy (TMDL-COSPEC-WMS) was used to measure carbon dioxide in ambient air around 1 570 nm .The carbon dioxide concentrations were derived from the relationship be-tween the normalized WMS-2f signal peak heights of the measurement and reference signals which selected based on high signal to noise ratio and correlation coefficient .All measurements were performed with controlled carbon dioxide and nitrogen mixtures in which carbon dioxide concentrations range from 0.6% to 30% .The calculation results showed that there was a high linear re-lationship between the measured and actual carbon dioxide concentration ,the linearity was 0.998 7 and the fitted slope was 1.061 ± 0.016 8 respectively over the tested range .A detection limit of 335 ppm · m was achieved .The standard deviation of 0.036 7% was achieved using 20 successive measurements with each measurement time taking ~10 s during 20 minutes ,which demonstrated good stability of the system .Good agreements between the measurements of the system and actual values confirm the accuracy and potential utility of the system for carbon dioxide detection .