Remote measurement of ethylene using a CO_2 differential-absorption lidar

Murray, E. R.; Laan, Jan E. van der

doi:10.1364/ao.17.000814

Cited by 46 publications

(7 citation statements)

References 6 publications

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“…In the past, IPDA applications have used either separate pyroelectric detectors [28][29][30] or photodiodes to normalize the pulse intensities [31]. Also, in more recent developments, separate photodetectors are usually used as the transmitter monitor [4,6,32].…”

Section: Detector Issuesmentioning

confidence: 99%

Energy calibration of integrated path differential absorption lidars

et al. 2018

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The stringent requirements for energy reference measurement represent a challenging task for integrated path differential absorption lidars to measure greenhouse gas columns from satellite or aircraft. The coherence of the lidar transmitter gives rise to speckle effects that have to be considered for accurate monitoring of the energy ratio of outgoing on-and off-line pulses. Detailed investigations have been performed on various measurement concepts potentially suited for deployment within future satellite missions.

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Section: Detector Issuesmentioning

confidence: 99%

Energy calibration of integrated path differential absorption lidars

et al. 2018

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“…The ramp voltage is turned off at a later time, tm, and the mirror motion stops. For a laser pulse length much less than it = tm4mjn, the range interval is c (2) LR=-Lt 2 The time-dependent return signal is the result of a convolution of the pulse shape with the scattering distribution within the gated range, but generally, a long pulse is selected to provide the maximum return signal strength. For a rectangular pulse equal to the gated range window and fixed molecular density, the receiver sees a triangular shaped pulse oflength Ltt.…”

Section: Description Of the Techniquementioning

confidence: 99%

Fourier transform Raman lidar for trace gas detection and quantification

Sentell

1994

SPIE Proceedings

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The Raman technique, while a valuable tool in chemical and combustion research, is limited in many remote sensing applications because of the low Raman scattering cross-section, which may be three to five orders of magnitude below the Rayleigh (elastic) values.Two concepts for increasing the signal level are discussed. First, use a range-gated Fourier transform spectrometer to increase the system throughput and allow multiplexing advantages. The spectrum is obtained by performing a FFT on the resulting interferogram. Second, since the cross section goes as the fourth power of the optical frequency, use ultra-violet laser illumination, and separate the resulting florescence radiation by placing a known dispersion on the transmitted waveform. The techniques for achieving this function, and the mathematical formulation for the phase-modulated auto-correlation which result, are not evaluated in this paper. However, the approach does not appreciably lower the available resolution because the limits are imposed by the sampling function inherent to the finite-duration Michelson minor scan.A conceptual design using a long-pulse, flashlamp-pumped dye laser is shown, and typical performance equations in the detection of Freon 12, CC12F2, are presented. For a one joule laser and a thirty (30) cm aperture operating in darkness, a concentration of 1023 molecules/rn3 can be detected in a 60 km visibility at a range of 3.4 km.

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“…The boundary layer height (BLH) determines the volume available for pollution dispersion and transport in the atmosphere. Low BLH and weak turbulence strengthen the accumulation of air pollutants (Miao et al, 2018;Petaja et al, 2016). Hence, the BLH is one of the fundamental parameters in dispersion models.…”

Section: Introductionmentioning

confidence: 99%

Relationship analysis of PM<sub>2.5</sub> and boundary layer height using an aerosol and turbulence detection lidar

Wang

Jia²,

Xia

et al. 2019

Atmos. Meas. Tech.

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Abstract. The atmospheric boundary layer height (BLH) is a key parameter in weather forecasting and air quality prediction. To investigate the relationship between BLH and air pollution under different conditions, a compact micro-pulse lidar integrating both direct-detection lidar (DDL) and coherent Doppler wind lidar (CDWL) has been built. This hybrid lidar is operated at 1.5 µm, which is eye-safe and made of all-fibre components. The BLH can be determined from aerosol density and vertical wind independently. During a 45 h continuous observation in June 2018, the stable boundary layer, residual layer and convective boundary layer are identified. The fine structure of the aerosol layers, drizzles and vertical wind near the cloud base are also detected. In comparison, the standard deviation between BLH values derived from DDL and CDWL is 0.06 km, indicating the accuracy of this work. The retrieved convective BLH is a little higher than that from ERA5 reanalysis due to different retrieval methods. Correlation between different BLH and PM2.5 is strongly negative before a precipitation event and becomes much weaker after the precipitation. Different relationships between PM2.5 and BLH may result from different BLH retrieval methods, pollutant sources and meteorological conditions.

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Remote measurement of ethylene using a CO_2 differential-absorption lidar

Cited by 46 publications

References 6 publications

Energy calibration of integrated path differential absorption lidars

Energy calibration of integrated path differential absorption lidars

Fourier transform Raman lidar for trace gas detection and quantification

Relationship analysis of PM<sub>2.5</sub> and boundary layer height using an aerosol and turbulence detection lidar

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Remote measurement of ethylene using a CO_2 differential-absorption lidar

Cited by 46 publications

References 6 publications

Energy calibration of integrated path differential absorption lidars

Energy calibration of integrated path differential absorption lidars

Fourier transform Raman lidar for trace gas detection and quantification

Relationship analysis of PM&lt;sub&gt;2.5&lt;/sub&gt; and boundary layer height using an aerosol and turbulence detection lidar

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Relationship analysis of PM<sub>2.5</sub> and boundary layer height using an aerosol and turbulence detection lidar