Trayとは 意味・読み方・使い方

語源

Initialism of t(erahertz) + ray, modelled after X-ray. The term was coined in Bell Labs in the United States in the mid-1990s.

発音

• (Received Pronunciation) IPA: /ˈtiːˌɹeɪ/
• (General American) IPA: /ˈtiˌɹeɪ/

名詞

T-ray (plural T-rays)

1. (electrical engineering, electromagnetism, also attributive, chiefly in the plural) An electromagnetic wave with a frequency intermediate between, and sharing the properties of, short radio waves and long infrared waves, generally in the 0.1 to 10 terahertz (THz) band of frequencies. [from mid 1990s]

   Synonym: T-wave

   Hypernyms: submillimeter wave radiation, terahertz radiation, tremendously high frequency

   • 1996 September, Daniel M. Mittleman, Rune H[ylsberg] Jacobsen, Martin C. Nuss, “T-ray Imaging”, in IEEE Journal of Selected Topics in Quantum Electronics‎, volume 2, number 3, New York, N.Y.: Institute of Electrical and Electronics Engineers, →DOI, →ISSN, →OCLC, archived from the original on 2023-03-13, page 679:

     This terahertz "T-ray" technology combines imaging, real-time acquisition of terahertz waveforms and advanced signal processing techniques to obtain far-infrared images of objects and materials. In many cases, T-Ray images can also distinguish chemical compositions of the object. These features of T-ray imaging have generated interest in commercial applications in diverse areas as moisture analysis, quality control of plastic parts, packaging inspection, and trace gas analysis and monitoring.

   • 2000 July 1, Robin McKie, “T-rays take over from X-rays”, in Alan Rusbridger, editor, The Guardian‎, London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 2014-05-09:

     Military officials believe T-rays could pinpoint the chemical constituents of anti-personnel mines, and spot terrorists carrying explosives into airports. Doctors are interested in T-rays because they are less damaging to living tissue than X-rays. Terahertz radiation is slightly more energetic than that of microwave ovens, and slightly less energetic than the infra-red light emitted by TV remote controls. […] Scientists are designing devices that can exploit the power of T-ray detection.

   • 2007 August, Derek Abbott, Xi-Cheng Zhang, “Scanning the Issue: T-Ray Imaging, Sensing, and Retection”, in Proceedings of the IEEE‎, volume 95, number 8, New York, N.Y.: Institute of Electrical and Electronics Engineers, →DOI, →ISSN, →OCLC, archived from the original on 2025-03-24, page 1511, column 1:

     A useful property of T-rays is that dry, nonpolar, and nonmetallic substances such as paper, cardboard, and plastics are transparent in these frequency band. As this includes many packaging materials, the implication is that T-rays have potential applications in quality control and security. The content of packages can be noninvasively probed and T-rays can produce a molecular fingerprint to identify the contents.

   • 2012 May 16, “Milestone for Wi-fi with ‘T-rays’”, in BBC News‎, archived from the original on 2023-10-14:

     Researchers in Japan have smashed the record for wireless data transmission in the terahertz band, an uncharted part of the electro-magnetic spectrum. The data rate is 20 times higher than the best commonly used wi-fi standard. […] The research, published in Electronics Letters, adds to the idea that this "T-ray" band could offer huge swathes of bandwidth for data transmission. The band lies between the microwave and far-infrared regions of the spectrum, and is currently completely unregulated by telecommunications agencies. […] Until recently, the technology required both to generate and detect these "T-rays" has been too bulky, costly or power-hungry to offer a plausible alternative to existing devices tucked within smartphones or wi-fi routers. That looks set to change; in November electronic component firm ROHM demonstrated a 1.5Gb/s (1.5 billion bits per second) transfer rate at a frequency of 300GHz.

使用する際の注意点

The International Telecommunication Union designates terahertz radiation to be in the 0.1 to 10 THz range, though some sources regard radiation up to 30 THz to be T-rays as well. In older works, the range was from 0.3 to 3 THz (now called decimillimetric waves).

参照

Further reading

• terahertz radiation on Wikipedia.Wikipedia

アナグラム

• Arty, arty