Precise measurement of pressure broadening parameters for water vapor with a terahertz time-domain spectrometer

Hoshina, Hiromichi; Seta, Takahiro; Iwamoto, Toshiyuki; Hosako, Iwao; Otani, Chiko; Kasai, Yasuko

doi:10.1016/j.jqsrt.2008.03.005

Cited by 48 publications

(24 citation statements)

References 15 publications

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“…G. Read, personal communication, 2011). The air-broadening coefficients, γ air and n air , were taken from the HITRAN 2008 catalog and the laboratory measurements (Drouin and Gamache, 2008;Hoshina et al, 2008;Sato et al, 2010;Drouin, 2007;Markov and Krupnov, 1995;Mizoguchi et al, 2012;Perrin et al, 2005, e.g. W. G. Read, personal communication, 2011.…”

Section: Calculation Of Radiative Transfermentioning

confidence: 99%

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

et al. 2012

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Abstract. Chlorine monoxide (ClO) is the key species for anthropogenic ozone losses in the middle atmosphere. We observed ClO diurnal variations using the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on the International Space Station, which has a non-sunsynchronous orbit. This includes the first global observations of the ClO diurnal variation from the stratosphere up to the mesosphere. The observation of mesospheric ClO was possible due to 10-20 times better signal-to-noise (S/N) ratio of the spectra than those of past or ongoing microwave/submillimeter-wave limb-emission sounders. We performed a quantitative error analysis for the strato-and mesospheric ClO from the Level-2 research (L2r) product version 2.1.5 taking into account all possible contributions of errors, i.e. errors due to spectrum noise, smoothing, and uncertainties in radiative transfer model and instrument functions. The SMILES L2r v2.1.5 ClO data are useful over the range from 0.01 and 100 hPa with a total error estimate of 10-30 pptv (about 10 %) with averaging 100 profiles. The SMILES ClO vertical resolution is 3-5 km and 5-8 km for the stratosphere and mesosphere, respectively. The SMILES observations reproduced the diurnal variation of stratospheric ClO, with peak values at mid-

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Section: Calculation Of Radiative Transfermentioning

confidence: 99%

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

et al. 2012

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“…The broad bandwidth of the terahertz radio meets the demands, and it is possible to provide a high-speed link >10 Gb/s when the available bandwidth is greater than 10 GHz. However, as the atmospheric attenuation coefficient in the band is estimated to be 3 dB/km under standard atmospheric conditions without any rain, the possible transmission distance could be shorter than the radio link by conventional microwave-and millimeterwave radio [16], [17]. In addition, the seamless convergence between the optical and radio networks is demanded to enhance the network functions such as virtualization and optimization of the network resources in future network configurations ( Fig.…”

Section: Introductionmentioning

confidence: 99%

High-Speed Coherent Transmission Using Advanced Photonics in Terahertz Bands

Kanno

Dat

Sekine

et al. 2015

IEICE Trans. Electron.

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SUMMARYA terahertz-wave communication system directly connected to an optical fiber network is promising for application to future mobile backhaul and fronthaul links. The possible broad bandwidth in the terahertz band is useful for high-speed signal transmission as well as radio-space encapsulation to the high-frequency carrier. In both cases, the low-latency feature becomes important to enhance the throughput in mobile communication and is realized by waveform transport technology without any digital-signal-processing-based media conversion. A highly precise optical frequency comb signal generated by optical modulation and the vector signal demodulation technology adopted from advanced optical fiber communication technologies help perform modulation and demodulation with impairment compensation at just the edges of the link. Terahertz wave, radio over fiber, waveform transport, coherent detection, multilevel modulation, radio on radio. key words: terahertz wave, radio over fiber, waveform transport, coherent detection, multi-level modulation, radio on radio

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“…It is noteworthy that THz time-domain spectroscopy (THz-TDS) has been pioneered as a basic measurement tool for characterizing optical and electrical properties of materials [2,3]. THz-TDS also provides a potentially attractive method for probing fundamental physical interactions as well as practical applications [4,5]. However, conventional THz-TDS using a single mode-locked femtosecond laser and a mechanical delay line has an inherent tradeoff between frequency resolution and measurement time since the frequency resolution is inversely proportional to an overall time delay window.…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, vibrating mirrors can give a scan rate of up to 100 Hz but the measured time delay window is limited to less than 100 ps. Different types of optical delay line have also been devised for rapid data acquisition or high spectral resolution [5,6].…”

Section: Introductionmentioning

confidence: 99%

Wavelet Power Spectrum Estimation for High-resolution Terahertz Time-domain Spectroscopy

Kim¹,

Jin²,

Ye³

et al. 2011

Journal of the Optical Society of Korea

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Recently reported asynchronous-optical-sampling terahertz (THz) time-domain spectroscopy enables high-resolution spectroscopy due to a long time-delay window. However, a long-lasting tail signal following the main pulse is often measured in a time-domain waveform, resulting in spectral fluctuation above a background noise level on a high-resolution THz amplitude spectrum. Here, we adopt the wavelet power spectrum estimation technique (WPSET) to effectively remove the spectral fluctuation without sacrificing spectral features. Effectiveness of the WPSET is verified by investigating a transmission spectrum of water vapor.

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Precise measurement of pressure broadening parameters for water vapor with a terahertz time-domain spectrometer

Cited by 48 publications

References 15 publications

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

High-Speed Coherent Transmission Using Advanced Photonics in Terahertz Bands

Wavelet Power Spectrum Estimation for High-resolution Terahertz Time-domain Spectroscopy

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