Instrumentation, Techniques, and Measurement

Saturation correction near the ground for pure rotational Raman lidar

[+] Author Affiliations
Zhongkun Wang

Beijing Institute of Technology, School of Optoelectronics, Laser Radar Laboratory, Beijing 100081, China

Yinchao Zhang

Beijing Institute of Technology, School of Optoelectronics, Laser Radar Laboratory, Beijing 100081, China

He Chen

Beijing Institute of Technology, School of Optoelectronics, Laser Radar Laboratory, Beijing 100081, China

Siying Chen

Beijing Institute of Technology, School of Optoelectronics, Laser Radar Laboratory, Beijing 100081, China

Pan Guo

Beijing Institute of Technology, School of Optoelectronics, Laser Radar Laboratory, Beijing 100081, China

Opt. Eng. 54(1), 014107 (Jan 23, 2015). doi:10.1117/1.OE.54.1.014107
History: Received August 14, 2014; Accepted December 17, 2014
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Abstract.  Saturation correction for photon counting near the Earth’s surface can improve the accuracy of temperature measurement in the troposphere by pure rotational Raman lidar (PRRL). The PRRL system uses a 532-nm band as a light source, and the echo signals of high-J and low-J channels separated by a double grating monochromator are used for temperature profile inversion. The pulse-height distribution and the discriminator level selection in the system, which comprise a photomultiplier and a photon counter, saturate photon counting near the ground and affect the echo signals from the higher layer for calibration. Given its nonlinear effect on the photomultiplier tubes, the correction method is applied to the echo signals of the calibration interval in troposphere temperature measurements. The method not only reduces the error in temperature measurement (the root-mean-square error of temperature reaches 1.5 K), but also accurately indicates the distribution of the inversion layer within the boundary layer. It can be applied to deal with the saturation phenomenon of a photomultiplier tube.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Zhongkun Wang ; Yinchao Zhang ; He Chen ; Siying Chen and Pan Guo
"Saturation correction near the ground for pure rotational Raman lidar", Opt. Eng. 54(1), 014107 (Jan 23, 2015). ; http://dx.doi.org/10.1117/1.OE.54.1.014107


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