Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect
The rotational Doppler effect (RDE), as a counterpart of the conventional well-known linear Doppler effect in the rotating frame, has attracted increasing attention in recent years for rotating object detection. However, the effect of the beam size on the RDE is still an open question. In this artic...
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| Format: | Article |
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MDPI AG
2022-07-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/8/517 |
| _version_ | 1827625876883243008 |
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| author | Song Qiu Ruoyu Tang Xiangyang Zhu Tong Liu Yuan Ren |
| author_facet | Song Qiu Ruoyu Tang Xiangyang Zhu Tong Liu Yuan Ren |
| author_sort | Song Qiu |
| collection | DOAJ |
| description | The rotational Doppler effect (RDE), as a counterpart of the conventional well-known linear Doppler effect in the rotating frame, has attracted increasing attention in recent years for rotating object detection. However, the effect of the beam size on the RDE is still an open question. In this article, we investigated the influence of the size of the probe light; i.e., the size of the ring-shaped orbital angular momentum (OAM)-carrying optical vortex (OV), on the RDE. Both the light coaxial and noncoaxial incident conditions were considered in our work. We analyzed the mechanism of the influence on the RDE under the light coaxial, lateral misalignment, and oblique incidence conditions based on the small-scatterer model. A proof-of-concept experiment was performed to verify the theoretical predictions. It was shown that both the signal-to-noise ratio and the frequency spectrum width were related to the OV size. The larger the beam size, the stronger the RDE signal observed in the practical detection. Especially in the lateral misalignment condition, the large OV size effectively reduced the signal spreading and enhanced the signal strength. These findings may be useful for practical application of the optical RDE in remote sensing and metrology. |
| first_indexed | 2024-03-09T12:44:49Z |
| format | Article |
| id | doaj.art-5b49cdf876f14a49abd3ba52ddaba33a |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T12:44:49Z |
| publishDate | 2022-07-01 |
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| series | Photonics |
| spelling | doaj.art-5b49cdf876f14a49abd3ba52ddaba33a2023-11-30T22:12:58ZengMDPI AGPhotonics2304-67322022-07-019851710.3390/photonics9080517Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler EffectSong Qiu0Ruoyu Tang1Xiangyang Zhu2Tong Liu3Yuan Ren4Department of Aerospace Science and Technology, Space Engineering University, Beijing 101416, ChinaDepartment of Aerospace Science and Technology, Space Engineering University, Beijing 101416, ChinaDepartment of Aerospace Science and Technology, Space Engineering University, Beijing 101416, ChinaDepartment of Aerospace Science and Technology, Space Engineering University, Beijing 101416, ChinaLab of Quantum Detection & Awareness, Space Engineering University, Beijing 101416, ChinaThe rotational Doppler effect (RDE), as a counterpart of the conventional well-known linear Doppler effect in the rotating frame, has attracted increasing attention in recent years for rotating object detection. However, the effect of the beam size on the RDE is still an open question. In this article, we investigated the influence of the size of the probe light; i.e., the size of the ring-shaped orbital angular momentum (OAM)-carrying optical vortex (OV), on the RDE. Both the light coaxial and noncoaxial incident conditions were considered in our work. We analyzed the mechanism of the influence on the RDE under the light coaxial, lateral misalignment, and oblique incidence conditions based on the small-scatterer model. A proof-of-concept experiment was performed to verify the theoretical predictions. It was shown that both the signal-to-noise ratio and the frequency spectrum width were related to the OV size. The larger the beam size, the stronger the RDE signal observed in the practical detection. Especially in the lateral misalignment condition, the large OV size effectively reduced the signal spreading and enhanced the signal strength. These findings may be useful for practical application of the optical RDE in remote sensing and metrology.https://www.mdpi.com/2304-6732/9/8/517optical vortexrotational Doppler effectorbital angular momentumremote sensingtopological charge |
| spellingShingle | Song Qiu Ruoyu Tang Xiangyang Zhu Tong Liu Yuan Ren Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect Photonics optical vortex rotational Doppler effect orbital angular momentum remote sensing topological charge |
| title | Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect |
| title_full | Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect |
| title_fullStr | Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect |
| title_full_unstemmed | Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect |
| title_short | Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect |
| title_sort | detection of a spinning object at different beam sizes based on the optical rotational doppler effect |
| topic | optical vortex rotational Doppler effect orbital angular momentum remote sensing topological charge |
| url | https://www.mdpi.com/2304-6732/9/8/517 |
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