Spectral bands

Physics

Geology

Meteorology

Infrared

Organic chemistry

Lidar

Laser

Atmosphere (unit)

Optics

Absorption (acoustics)

Astronomy

Spectral resolution

Radiation

Atmosphere of Earth

Composite material

Acoustics

Chemistry

Materials science

Range (aeronautics)

Dial

Near-infrared spectroscopy

Spectral line

Atmospheric optics

Environmental science

Optoelectronics

Methane

Wavelength

Remote sensing

Atmosphere

A differential absorption lidar (DIAL) system designed on the basis of optical parametric oscillators (OPO) with nonlinear KTiOAsO4 (KTA) and KTiOPO4 (KTP) crystals is described. The crystals allow laser radiation tuning in the infrared region (IR) wavelength region. The measurements in the 3.30–3.50 μm spectral range, which includes a strong absorption band of methane, are carried out. Lidar backscattered signals in the spectral band 3.30–3.50 μm has been measured and analyzed along the horizontal path in the atmosphere. Based on the experimental results, CH4 concentrations ~2.085 ppm along a 800 m surface path are retrieved in the spectral range under study with a spatial resolution of 100 m.

Remote Sensing of Atmospheric Methane with IR OPO Lidar System