With the development of laser and photoelectric technology, narrowband sodium (Na) Doppler lidars which can measure temperature and wind in the mesosphere and lower thermosphere (MLT) region were established in several observation sites in China. In this paper, the observation of temperature and wind in both nighttime and daytime by a Na lidar recently established in Lanzhou, China (35.95°N, 104.13°E) was reported. The multichannel data acquisition system based on MCS8 was introduced, and the preliminary observational results obtained on January 2022 was presented. The temperature profile measured by lidar was compared with the result from satellite, showing basically consistent trend between 80 and 110 km.
KEYWORDS: Temperature metrology, Quantum cascade lasers, Combustion, Sensors, Absorption, Spectroscopy, Laser spectroscopy, Optical engineering, Absorption spectroscopy, Signal to noise ratio
The development of temperature sensors with ultra-fast response, high sensitivity, and wide range of temperature is of important academic value for the study of flame structure and combustion characteristics under extreme conditions. Recently, tunable diode laser absorption spectroscopy (TDLAS) is developed rapidly as an important means of combustion diagnostics due to its outstanding characteristics, such as non-invasiveness, rapid response, and high realizability. The absorption lines of TDLAS are extended to the mid-infrared region. Two spectral lines of H2O at center wavelength of 2136.14 and 1874.31 cm − 1 are used as candidate pair, which provides a wide measuring range (800 to 4000 K) and high-temperature sensitivity (4.55 at 1000 K) sensor for temperature measurement. We used two quantum cascade lasers with wavelength of 4.68 and 5.34 μm to scan the selected line pair of H2O rapidly in the combustion environment and obtained the temperature information of the combustion field. Our work provides a good solution for the temperature measurement of extreme combustion environment with ultra-fast response, high sensitivity, and wide temperature range.
The development of imaging equipments for pollutant gases monitoring is concerned not only to efficient resource utilization but also to environment protection. CO is extremely harmful although its concentration is relatively low among industrial waste gases, which leads to a challenge for traditional spectral remote sensing methods. The infrared imaging molecular filter show great advantage in extracting target gas infrared spectrum signal and restraining radiation interference from environmental background and other gases due to its characteristics of the comb like transmission spectrum with ultra narrow band. In this paper, remote sensing and monitoring of industrial CO emissions based on infrared imaging molecular filter technology is carried out. real-time images of CO gas are also obtained. The experimental results show that this scheme provides a good solution for remote sensing and monitoring of industrial waste gas by using an imaging method.
A multipurpose Lidar was built at Wuhan Institute of Physics & Mathematics, Chinese Academy of Science. The Lidar
consists of an YAG laser pumped dye laser system, two receiving telescopes and several detection channels. During the
past few years, we conducted some lidar observation in various altitudes of the atmosphere at our location. In this paper,
we describe the technical aspects of this multipurpose lidar, and summarize some of the atmosphere observation results
obtained by the lidar over Wuhan, China (31 deg N,114 deg E) with the emphasis on the sodium layer detections.
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