Improved &amp;#x2018;THz Torch&amp;#x2019; technology for short-range wireless data transfer

Hu, Fangjing; Lucyszyn, S.

doi:10.1109/ieee-iws.2013.6616775

Cited by 8 publications

(11 citation statements)

References 9 publications

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“…14. As the bias current increases, the peak in spectral radiance increases in frequency, as dictated by (3). However, when compared to the secondary radiation mechanism, the output power from the primary radiation mechanism is more strongly coupled to changes in bias current.…”

Section: Calculated and Measured Band-limited Output Radiated Powermentioning

confidence: 98%

“…The spectral range for the first proof-ofconcept single-channel 'THz Torch' system was defined over the 25 to 50 THz (12 μm to 6 μm) octave bandwidth [1,3,4], while four non-overlapping spectral ranges for the 4-channel multiplexing systems are: 15 to 34 THz (20 μm to 8.8 μm) for Channel A; 42 to 57 THz (7.1 μm to 5.3 μm) for Channel B; 60 to 72 THz (5 μm to 4.2 μm) for Channel C; and 75 to 89 THz (4 μm to 3.4 μm) for Channel D [2,[4][5][6]. Fig.…”

Section: Band-limited Output Radiated Power To Input DC Power Conversmentioning

confidence: 99%

“…For the simple proof-of-concept demonstrator, the 'THz Torch' transmitter consists of five Eiko 8666-40984 miniature incandescent light bulbs, having a length of 6.3 mm and diameter 2.6 mm [1][2][3][4][5][6]. These bulbs are connected in series and assembled into a compact cylindrical package having an outer diameter of 8.2 mm, as shown in Fig.…”

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confidence: 99%

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Modelling Miniature Incandescent Light Bulbs for Thermal Infrared ‘THz Torch’ Applications

Lucyszyn

2015

J Infrared Milli Terahz Waves

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The 'THz Torch' concept is an emerging technology that was recently introduced by the authors for implementing secure wireless communications over short distances within the thermal infrared (20-100 THz, 15 μm to 3 μm). In order to predict the band-limited output radiated power from 'THz Torch' transmitters, for the first time, this paper reports on a detailed investigation into the radiation mechanisms associated with the basic thermal transducer. We demonstrate how both primary and secondary sources of radiation emitted from miniature incandescent light bulbs contribute to the total band-limited output power. The former is generated by the heated tungsten filament within the bulb, while the latter is due to the increased temperature of its glass envelope. Using analytical thermodynamic modelling, the band-limited output radiated power is calculated, showing good agreement with experimental results. Finally, the output radiated power to input DC power conversion efficiency for this transducer is determined, as a function of bias current and operation within different spectral ranges. This modelling approach can serve as an invaluable tool for engineering solutions that can achieve optimal performances with both single and multi-channel 'THz Torch' systems.

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Section: Calculated and Measured Band-limited Output Radiated Powermentioning

confidence: 98%

Section: Band-limited Output Radiated Power To Input DC Power Conversmentioning

confidence: 99%

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Modelling Miniature Incandescent Light Bulbs for Thermal Infrared ‘THz Torch’ Applications

Lucyszyn

2015

J Infrared Milli Terahz Waves

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“…This offers opportunities for developing wireless communications system within this largely unused part of the electromagnetic spectrum. The 'THz Torch' concept was recently introduced by the authors for providing secure wireless communications over short distances within the thermal infrared [1][2][3][4][5][6]. For example, an octave bandwidth (25-50 THz) single-channel wireless link with a data rate of 760 bps has been reported [3,4].…”

Section: Introductionmentioning

confidence: 99%

Multi-channel thermal infrared communications using engineered blackbody radiation for security applications

Liang

Lucyszyn

2014

SPIE Proceedings

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The thermal (emitted) infrared frequency bands, typically from 20-40 THz and 60-100 THz, are best known for applications in thermography, such as target acquisition, surveillance, night vision, and remote sensing. This unregulated part of the spectral range offers opportunities for the development of short-range secure communications. The 'THz Torch' concept was recently demonstrated by the authors. This technology fundamentally exploits engineered blackbody radiation, by partitioning thermally-generated spectral noise power into pre-defined frequency channels. The energy in each channel is then independently pulse-modulated, transmitted and detected, creating a robust form of short-range secure communications in the far/mid infrared. In this paper, recent progress for the 'THz Torch' technology will be presented; the physical level integrity for multichannel proof-of-concept working demonstrators will be evaluated. By exploring a diverse range of methods, significant enhancements to both data rate and distance can be expected. Our thermodynamics-based approach represents a new paradigm in the sense that 19 th century physics can be exploited with 20 th century multiplexing concepts for low-cost 21 st century ubiquitous security and defence applications in the thermal infrared range.

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“…The 'THz Torch' concept was recently presented as an ultra-low cost technology [2]- [6]. Single-channel links with a relatively low data rate of 380 bps has been reported [4]. Multi-channel 'THz Torch' systems using frequency division multiplexing (FDM) and frequencyhopping spread-spectrum (FHSS) schemes have been proposed [3].…”

Section: Introductionmentioning

confidence: 99%

Link budget analysis for secure thermal infrared communications using engineered blackbody radiation

Liang

Yan

et al. 2014

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)

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The 'THz Torch' concept was recently introduced as an ultra-low cost means of providing secure short-range wireless communications in the thermal infrared spectral range (10-100 THz). This technology exploits engineered blackbody radiation, by partitioning thermally-generated spectral noise power into pre-defined frequency channels; the energy in each channel is then independently pulsed modulated and transmitted. This technology can be further enhanced by multiplexing schemes, e.g. frequency division multiplexing (FDM) and frequency-hopping spread-spectrum (FHSS). In this paper, the end-to-end link budget analysis for a 4-channel 'THz Torch' working demonstrator, operating over a short transmission range of 1 cm, is given for the first time. Mathematical modelling of the end-to-end wireless link is presented. In the analysis, different bias points for the source are considered and the corresponding RMS output voltages at the receivers are calculated. The predicted results show the capability for each channel, and will serve as a guide for further improving the overall performance of this multi-channel 'THz Torch' system. Index Terms -THz Torch, wireless communications, thermal infrared, link budget, blackbody radiation.

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Improved ‘THz Torch’ technology for short-range wireless data transfer

Cited by 8 publications

References 9 publications

Modelling Miniature Incandescent Light Bulbs for Thermal Infrared ‘THz Torch’ Applications

Modelling Miniature Incandescent Light Bulbs for Thermal Infrared ‘THz Torch’ Applications

Multi-channel thermal infrared communications using engineered blackbody radiation for security applications

Link budget analysis for secure thermal infrared communications using engineered blackbody radiation

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