Английская Википедия:Bioradiolocation

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Bio-radiolocation is a technology[1] for remote detection and diagnostics of biological objects by means of radar,[2] even behind optically opaque obstacles.[3][4] Devices based on this method are called bio-radars.

Theoretical basis

This technology is based on the reflected signal modulation caused by movements of the human body and internal organs. While the examinee maintains a calm state (e.g. is sleeping or sitting in a fixed pose) modulation of bio-radar signal is caused mainly by respiratory movements (0.2-0.5 Hz) and heart and superficial arteries pulsations (0.5–20 Hz).[5] The amplitude of thorax surface displacement caused by respiratory muscles contractions is about 1 cm, while the same parameter for heart beating is only 1 mm. Recently, researchers showed that heart sounds (20–80 Hz) with an amplitude in the micrometer range can be detected, too.[6][7][8] The order of registered parameters determines the usage of microwave frequency band. Impulse,[9] linearly[10] or step-frequency [11] modulated and monochromatic[12] signals can be used as probing ones.

Applications

The main advantage of bio-radiolocation is its remote and contactless nature.[13] At present, commercially available bio-radars are aimed at the detection of people and at tracking them behind buildings or other obstacles (e.g. during antiterrorist operations[14][15]). There are also bio-radars, used by rescuers for finding people under building debris.[16] However, such devices have not found widespread application in disaster rescue operations due to fundamental limitations of the method related to noises and background reflections.

The most promising area in which bio-radiolocation method may be applied is medicine.[17] Bio-radar can be used in sleep medicine[18] for sleep apnea syndrome monitoring[19] in adults and newborns. Furthermore, it can be used for the measurement of heart sounds[6] and to extract heart rate variability.[20] In addition, they can be applied in a host of other fields, such as professional selection,[21] pharmacology, and zoo-psychology,[22] etc.[23]

References

Шаблон:Reflist

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  1. ↑ Шаблон:Cite journal
  2. ↑ Шаблон:Cite journal
  3. ↑ Шаблон:Cite journal
  4. ↑ Шаблон:Cite book
  5. ↑ Шаблон:Cite journal
  6. ↑ 6,0 6,1 Шаблон:Cite journal
  7. ↑ Шаблон:Cite journal
  8. ↑ Шаблон:Cite journal
  9. ↑ Шаблон:Cite journal
  10. ↑ Шаблон:Cite journal
  11. ↑ Шаблон:Cite book
  12. ↑ S.I. Ivashov, V.V. Razevig, A.P. Sheyko, I.A. Vasilyev, "Detection of Human Breathing and Heartbeat by Remote Radar", Progress in Electromagnetics Research Symposium (PIERS 2004), March 28–31, 2004, Pisa, Italy, pp. 663-666.
  13. ↑ Шаблон:Cite journal
  14. ↑ Шаблон:Cite web
  15. ↑ Шаблон:Cite book
  16. ↑ M. Pieraccini, G. Grazzini, D. Dei, C. Atzeni, GPR system to locate survivors of natural disasters // Proc. Of 12th International Conference on ground penetrating radar, June 16–19, 2008, Birmingham, UK.
  17. ↑ Шаблон:Cite journal
  18. ↑ Шаблон:Cite journal
  19. ↑ Шаблон:Cite journal
  20. ↑ Шаблон:Cite journal
  21. ↑ Шаблон:Cite book
  22. ↑ Application of Bioradiolocation for Estimation of the Laboratory Animals' Movement Activity /L.N. Anishchenko, A.S. Bugaev, S.I. Ivashov, I.A. Vasiliev //PIERS Online. 2009. Vol. 5, No. 6. P.551 – 554.
  23. ↑ Шаблон:Cite news
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