2021年6月4日 · We proposed a new technique to obtain more accurate measurements of NO 2 using a three-wavelength DIAL technique based on an optical parametric oscillator (OPO) laser. This study derives the three-wavelength DIAL retrieval equations necessary to retrieve vertical profiles of NO 2 in the troposphere.

2024年10月1日 · In this work, a field deployable continuous-wave NO 2 -DIAL system based on the Scheimpflug principle, employing a high-power multimode 450-nm laser diode as the wavelength-tunable light source, has been designed and implemented for field monitoring of atmospheric NO 2.

2025年1月27日 · This study presents a CW-DIAL system for remote sensing of atmospheric NO 2 that employs a compact grating-based external cavity diode laser (ECDL) and Scheimpflug imaging. The laser in this system utilizes a piezoelectric transducer (PZT) for precise wavelength tuning, emitting at 448.1 nm and 449.7 nm with an output power of 2.97 W and a ...

2022年1月1日 · A differential absorption lidar (DIAL) for measurement of atmospheric nitrogen dioxide (NO 2) concentration is developed based on atmospheric backscattered signals. Two Nd:YAG lasers are used to pump into two dye lasers to produce two wavelengths λon (448.1 nm) and λoff (446.6 nm), respectively.

2017年9月12日 · In this work, a continuous-wave (CW) NO 2 DIAL system based on the Scheimpflug principle has been developed by employing a compact high-power CW multimode 450 nm laser diode as the light source. Laser emissions at the on-line and off-line wavelengths of the NO 2 absorption spectrum are implemented by tuning the injection current of the laser diode.

差分吸收激光雷达(DIAL)是探测大气NO2质量浓度廓线的一种有效手段,具有高探测灵敏度和高时空分辨率的特点,能够实时监测三维空间中的大气痕量气体(SO2、O3、NO2等)分布 ,在大气环境监测领域具有重要的应用价值[6-8]。 DIAL技术的基本原理是向大气交替发射两束波长相近的激光脉冲,其中一束激光脉冲的波长(λ. λoff的激光的差分吸收,可反演出待测气体的质量浓度信息。 基于差分吸收的原理,DIAL技术在探测痕量气体时不可避免地受到其他大气成分(大气分子、大气气溶胶 …

2021年10月19日 · 二氧化氮(NO2)是一种重要的大气污染物,严重危害人体健康以及生态系统,实现NO2浓度空间分布探测对大气环境监测与治理具有重要意义.作为一种主动式光学遥感探测技术,差分吸收激光雷达(DIAL)技术可实现大气痕量气体水平和垂直空间分布探测、高架源排放气体 ...

2017年10月2日 · In this work, a continuous-wave (CW) NO2 DIAL system based on the Scheimpflug principle has been developed by employing a compact high-power CW multimode 450 nm laser diode as the light source. Laser emissions at the on-line and off-line wavelengths of the NO2 absorption spectrum are implemented by tuning the injection current of the laser diode.

Evaluation of the DIAL technique for studies on NO2 using a mobile lidar system Kent A. Fredriksson and Hans M. Hertz The DIAL technique for remote monitoring of nitrogen dioxide is evaluated. A comprehensive field test and evaluation program was performed to determine the measuring capability for this pollutant.

2017年11月15日 · We present a novel lidar for measuring tropospheric NO2 vertical profiles. For improving the received powers, the emitter unit consists of two pulsed pump laser – dye laser combination, and use three wavelengths of 448.10nm, 447.20nm and 446.60 nm corresponding to the strong, medium and weak absorption of NO2 respectively.