Investigating Suppression of Cloud Return with a Novel Optical Configuration of a Doppler Lidar.
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| Title: | Investigating Suppression of Cloud Return with a Novel Optical Configuration of a Doppler Lidar. |
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| Authors: | Jin, Liqin1 (AUTHOR) jmsq@dtu.dk, Mann, Jakob1 (AUTHOR), Sjöholm, Mikael1 (AUTHOR) |
| Source: | Remote Sensing. Aug2022, Vol. 14 Issue 15, p3576-3576. 19p. |
| Subjects: | Lorentzian function, Electronic equipment, Spatial resolution, Laser beams, Doppler lidar, LIDAR, Ice clouds |
| Abstract: | The full-width at half-maximum or probe length of the Lorentzian weighting function of continuous-wave Doppler lidars increases quadratically with the focus distance, which results in a deterioration in the spatial resolution of measurements. What is worse, a Doppler lidar is susceptible to moving objects that are far away from the intended measurement point. Therefore, we suggest a novel configuration to mitigate these problems by deploying two co-planar quarter-wave plates with orthogonal fast axes in the conventional continuous-wave lidar system, without any change to the other optical or electronic components. If the vertically polarized laser beam that we emit goes out and its backscattered beam returns back through the same quarter-wave plate, the returned beam will become horizontally polarized. The horizontally polarized backscattered beam cannot beat with the vertically polarized local oscillator to generate a Doppler signal. However, the polarization of the returned beam will remain unchanged if the emitted beam travels out through one plate and returns through the other. In this way, the influence of a moving backscattering particle far away from the focus point can be reduced. Both theoretical and experimental results show that, in a proper configuration, the probe length of the continuous-wave lidar can be reduced by 10 % , compared with that of the conventional lidar. In addition, the fat tails of the Lorentzian weighting function can be suppressed by up to 80 % to reduce the return from a cloud, albeit with a large reduction (perhaps 90 % ) in the signal power. This investigation provides a potential method to increase the spatial resolution of Doppler wind lidars and suppress the low-hanging cloud return. [ABSTRACT FROM AUTHOR] |
| Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 158523635 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Investigating Suppression of Cloud Return with a Novel Optical Configuration of a Doppler Lidar. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jin%2C+Liqin%22">Jin, Liqin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jmsq@dtu.dk</i><br /><searchLink fieldCode="AR" term="%22Mann%2C+Jakob%22">Mann, Jakob</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sjöholm%2C+Mikael%22">Sjöholm, Mikael</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Remote+Sensing%22">Remote Sensing</searchLink>. Aug2022, Vol. 14 Issue 15, p3576-3576. 19p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lorentzian+function%22">Lorentzian function</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+equipment%22">Electronic equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+resolution%22">Spatial resolution</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+beams%22">Laser beams</searchLink><br /><searchLink fieldCode="DE" term="%22Doppler+lidar%22">Doppler lidar</searchLink><br /><searchLink fieldCode="DE" term="%22LIDAR%22">LIDAR</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+clouds%22">Ice clouds</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The full-width at half-maximum or probe length of the Lorentzian weighting function of continuous-wave Doppler lidars increases quadratically with the focus distance, which results in a deterioration in the spatial resolution of measurements. What is worse, a Doppler lidar is susceptible to moving objects that are far away from the intended measurement point. Therefore, we suggest a novel configuration to mitigate these problems by deploying two co-planar quarter-wave plates with orthogonal fast axes in the conventional continuous-wave lidar system, without any change to the other optical or electronic components. If the vertically polarized laser beam that we emit goes out and its backscattered beam returns back through the same quarter-wave plate, the returned beam will become horizontally polarized. The horizontally polarized backscattered beam cannot beat with the vertically polarized local oscillator to generate a Doppler signal. However, the polarization of the returned beam will remain unchanged if the emitted beam travels out through one plate and returns through the other. In this way, the influence of a moving backscattering particle far away from the focus point can be reduced. Both theoretical and experimental results show that, in a proper configuration, the probe length of the continuous-wave lidar can be reduced by 10 % , compared with that of the conventional lidar. In addition, the fat tails of the Lorentzian weighting function can be suppressed by up to 80 % to reduce the return from a cloud, albeit with a large reduction (perhaps 90 % ) in the signal power. This investigation provides a potential method to increase the spatial resolution of Doppler wind lidars and suppress the low-hanging cloud return. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=158523635 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/rs14153576 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 3576 Subjects: – SubjectFull: Lorentzian function Type: general – SubjectFull: Electronic equipment Type: general – SubjectFull: Spatial resolution Type: general – SubjectFull: Laser beams Type: general – SubjectFull: Doppler lidar Type: general – SubjectFull: LIDAR Type: general – SubjectFull: Ice clouds Type: general Titles: – TitleFull: Investigating Suppression of Cloud Return with a Novel Optical Configuration of a Doppler Lidar. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jin, Liqin – PersonEntity: Name: NameFull: Mann, Jakob – PersonEntity: Name: NameFull: Sjöholm, Mikael IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 20724292 Numbering: – Type: volume Value: 14 – Type: issue Value: 15 Titles: – TitleFull: Remote Sensing Type: main |
| ResultId | 1 |
