Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation

Shirvani-Mahdavi, Hamidreza; Narges, Yaghoubi

doi:10.1007/s40094-016-0231-y

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…When an object is placed in a closed duct, the total pressure difference (∆p) gives how much loss is generated by the flow: ∆p = p inlet − p outlet (10) Nevertheless, this pressure difference could be different at various flowrates, which is why it is advisable to divide this pressure difference by the dynamic pressure which will give the head loss coefficient (C H ) [18]:…”

Section: Head Loss Coefficientmentioning

confidence: 99%

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Heat Sink Shape and Topology Optimization with Pareto-Vector Length Optimization for Air Cooling

Szodrai

2020

Energies

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Localized air cooling can be used for various purposes, e.g.: electronic equipment cooling, and air conditioning. The paper emphasizes that the connection between the air-flow and cooling has to fulfill a contradictory requirement (low pressure loss and effective cooling). The cooling and the pressure loss are dependent on the moisture content of the air flow. In the study, heat sink geometries were examined at various fresh air relative humidity, temperature and flowrates with commercially available simulation software (Ansys Fluent). The most favorable option was chosen by Pareto-vector length optimization. For optimization, head loss coefficient and temperature coefficient were used. Firstly, 108 cases were made to evaluate the sensitivity of the optimization parameters. Secondly, on 40 finned heat sinks with different fin width and quantity optimization were made. Thirdly, a prototype was made from the favorite solution where the performance was evaluated. For the measurement two type: TEC1-12706 thermoelectric cooling devices (TEC) were used for cooling. The difference between the measured and the modelled cooled air temperatures was 3%.

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Section: Head Loss Coefficientmentioning

confidence: 99%

“…Small-independently-localized cooling systems could also reduce the energy demands. For example, when it is applied in a personal ventilation system in a commercial environment [6,7] or in automobiles or for electric devices [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Heat Sink Shape and Topology Optimization with Pareto-Vector Length Optimization for Air Cooling

Szodrai

2020

Energies

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Design and characteristics of a cavity-enhanced Fourier-transform spectrometer based on a supercontinuum source

Libert

Urbain

Fabre

et al. 2020

Review of Scientific Instruments

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We report the in-house fabrication of a high-resolution Fourier-transform spectrometer (FTS) for the spectroscopy of molecules in the gas phase at resolutions down to 0.002 cm−1 working in the spectral range from 5880 cm−1 (1.7 μm) to 15 380 cm−1 (650 nm). The FTS employs a supercontinuum as a broadband light source and a He:Ne laser with a homemade frequency-stabilization scheme as the spatial reference for the sampling of the interferogram on a constant optical path difference (OPD) grid. The sampling of the two lasers is performed at constant time intervals, and the resampling process is performed at the software level. The resampling of the interferogram on a constant OPD grid relies on cubic approximations of the He:Ne interference pattern to determine its zero-crossings. The use of an invariant in the sampling process allows us to perform on-the-fly data treatment. Both the hardware aspect and the data processing are described with, in each case, an original approach. We also report the successful coupling of the FTS with a high finesse optical cavity with effective mirror reflectivities of 99.76%, allowing us to reach sensitivities down to 6.5 × 10−8 cm−1 with a root-mean-square accuracy of 0.0017 cm−1 on the position of the Doppler-broadened transitions with a mean transition width of 0.046 cm−1 for spectra recorded at a spectral resolution of 0.015 cm−1. The sensitivity of the instrument per spectral element, once normalized, represents the best sensitivity reported in the literature for Fourier-transform incoherent broadband cavity-enhanced absorption spectroscopy with a supercontinuum light source.

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Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation

Cited by 2 publications

References 23 publications

Heat Sink Shape and Topology Optimization with Pareto-Vector Length Optimization for Air Cooling

Heat Sink Shape and Topology Optimization with Pareto-Vector Length Optimization for Air Cooling

Design and characteristics of a cavity-enhanced Fourier-transform spectrometer based on a supercontinuum source

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