Open field testing of mid IR DIAL for remote detection of thiodiglycol vapor plumes in the topographic target configuration

Veerabuthiran, S.; Razdan, A. K.; Jindal, Mukesh Kumar; Prasad, G. Bhanu

doi:10.1016/j.snb.2019.126833

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…The LIDAR backscattered signal from the free space is estimated by the standard LIDAR equation [10][11]which is written as Eq. 1.…”

Section: Differential Absorption Lidar (Dial) Systemmentioning

confidence: 99%

Differential absorption LIDAR signal denoising using empirical mode decomposition technique

Jindal,

Mainuddin,

Veerabuthiran

et al. 2023

Opt Quant Electron

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Differential Absorption Lidar (DIAL) technique is a potential method for the remote detection of hazardous chemicals in the atmosphere. These hazardous chemicals can be due to industrial pollution or may be intentionally released by the terrorist groups or military forces of the enemy country to endanger both the military's personnel and the civilian population's lives. DIAL technique may be used for probing such chemicals from far-off distances of several km ranges and generating an early warning for the response teams. The output of the DIAL system normally consists of three parameters viz. name/class of hazardous chemical detected; its location in terms of distance and the concentration. The maximum standoff distance capability for any Lidar system depends on the signal to noise ratio which is governed by the parameters like atmospheric conditions, Lidar subsystem speci cations, noises, etc. SNR is often limited by several noises embedded in the signal from various sources. Due to the presence of noises in the signal, the errors are introduced in the concentration estimation of chemicals from Lidar signal. The methods for improvement of SNR of lidar signal has been often limited by application of conventional denoising techniques like multi-pulse temporal averaging and spatial averaging and further requires nonlinear techniques for noise reduction due to nonlinear behavior of lidar signals. In the present work, Empirical Mode Decomposition (EMD) technique has been implemented on the Lidar signal from Differential Absorption Lidar system. The signal has been denoised and improved SNR is compared with that achieved from temporal averaging and spatial averaging. It was observed that the EMD technique is a better technique as compared to other conventional techniques like multi-pulse temporal averaging and spatial averaging for denoising the signal and increasing Lidar SNR. It is seen that SNR can be improved 4-5 times the original SNR using EMD technique.

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“…The LIDAR backscattered signal from the free space is estimated by the standard LIDAR equation [10][11]which is written as Eq. 1.…”

Section: Differential Absorption Lidar (Dial) Systemmentioning

confidence: 99%

Differential absorption LIDAR signal denoising using empirical mode decomposition technique

Jindal,

Mainuddin,

Veerabuthiran

et al. 2023

Opt Quant Electron

Self Cite

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“…The sensitivity of the DIAL method is characterized by the minimum measurable concentration of the gas molecule that can be detected with the minimum errors in optical signal. The expression for the minimum detectable content is given below [12]:…”

Section: Dial Theorymentioning

confidence: 99%

“…In recent years, a series of achievements have been made in the research of gas detection in the mid-infrared band. S. Veerabuthiran et al [12] developed a 3.0-3.45 µm DIAL system with a laser energy of 5 mJ, line width less than 7 cm −1 and frequency of 10 Hz. The designed system could be used to measure the concentration of thiodiglycol (TDG) vapor plumes in open state.…”

Section: Introductionmentioning

confidence: 99%

High Repetition Rate Mid-Infrared Differential Absorption Lidar for Atmospheric Pollution Detection

Gong

Yang³

et al. 2020

Sensors

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Developments in mid-infrared Differential Absorption Lidar (DIAL), for gas remote sensing, have received a significant amount of research in recent years. In this paper, a high repetition rate tunable mid-infrared DIAL, mounted on a mobile platform, has been built for long range remote detection of gas plumes. The lidar uses a solid-state tunable optical parametric oscillator laser, which can emit laser pulse with repetition rate of 500 Hz and between the band from 2.5 μm to 4 μm. A monitoring channel has been used to record the laser energy in real-time and correct signals. Convolution correction technology has also been incorporated to choose the laser wavelengths. Taking NO2 and SO2 as examples, lidar system calibration experiment and open field observation experiment have been carried out. The observation results show that the minimum detection sensitivity of NO2 and SO2 can reach 0.07 mg/m3, and 0.31 mg/m3, respectively. The effective temporal resolution can reach second level for the high repetition rate of the laser, which demonstrates that the system can be used for the real-time remote sensing of atmospheric pollution gas.

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Simultaneous detection of multiple gaseous pollutants using multi-wavelength differential absorption LIDAR

Yang

Zhang²,

Chen³

et al. 2022

Optics Communications

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Open field testing of mid IR DIAL for remote detection of thiodiglycol vapor plumes in the topographic target configuration

Cited by 13 publications

References 18 publications

Differential absorption LIDAR signal denoising using empirical mode decomposition technique

Differential absorption LIDAR signal denoising using empirical mode decomposition technique

High Repetition Rate Mid-Infrared Differential Absorption Lidar for Atmospheric Pollution Detection

Simultaneous detection of multiple gaseous pollutants using multi-wavelength differential absorption LIDAR

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