© The Institution of Engineering and Technology
A method is presented to improve the determination of the rotational velocity of an on-axis spinning object. It uses the Orbital Angular Momentum (OAM) of an electromagnetic wave at 2.47 GHz, and measures the rotational Doppler frequency shift of a reflected wave. From this shift, the rotational velocity and the direction of rotation can be directly estimated with very good accuracy.
References
-
-
1)
-
4. Zheng, J., Zheng, S., Shao, Z., et al: ‘Rotational Doppler effect based on the radio orbital angular momentum wave’. Proc. of 2017 Asia Pacific Microwave Conf., Malaysia, November 2017.
-
2)
-
16. Wei, W.L., Mahdjoubi, K., Brousseau, C., et al: ‘Generation of OAM waves with circular phase shifter and array of patch antennas’, IET Electron. Lett., 2015, 51, (6), pp. 442–443 (doi: 10.1049/el.2014.4425).
-
3)
-
3. Jackson, J.D.: ‘Classical electrodynamics’ (Wiley, New York, NY, USA, 1998, 3rd edn.).
-
4)
-
5. Gong, T., Cheng, Y., Li, X., et al: ‘Micromotion detection of moving and spinning object on rotational Doppler shift’, Microw. Wirel. Compon. Lett., 2018, 28, (9), pp. 843–845 (doi: 10.1109/LMWC.2018.2858552).
-
5)
-
1. Courtial, J., Robertson, D.A., Dholakia, K., et al: ‘Rotational frequency shift of a light beam’, Phys. Rev. Lett., 1998, 81, (22), pp. 4828–4830 (doi: 10.1103/PhysRevLett.81.4828).
-
6)
-
2. Lavery, M.P.J., Speirits, F.C., Barnett, S.M., et al: ‘Detection of a spinning object using light's orbital angular momentum’, Science, 2013, 341, (6145), pp. 537–540 (doi: 10.1126/science.1239936).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2019.0942
Related content
content/journals/10.1049/el.2019.0942
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Correspondence
This article has following corresponding article(s):
interview