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  • 1
    Language: English
    In: Applied Optics, Feb 10, 2018, Vol.57(5), p.1247(7)
    Description: A precise 3D surface measurement method for large stepped structures without height ambiguity is proposed based on optical-frequency-comb-referenced frequency-sweeping interferometry and Fourier-transformed fractional phase retrieval. Unlike other interferometry that depends on the absolute phase value for several certain wavelengths, this method obtains results from the phase change during frequency sweeping and thus remains free from the confined non-ambiguity range. By reference to an optical frequency comb, the relative uncertainty from the tunable laser frequency was reduced by three orders of magnitude, and the sweeping frequency range can be precisely determined. Besides, the fractional phase can be rapidly retrieved in only one step using a Fourier transform method, with advantages of high accuracy and immunity to light intensity fluctuation and mechanical vibration noise. Samples of step heights from 1 ?m to 1 mm were measured, and the standard uncertainty was 45 nm. This permits applications such as quality assurance in microelectronics production and micro-electro-mechanical system (MEMS) manufacture.
    Keywords: Interferometry – Usage ; Wavelength – Research
    ISSN: 1559-128X
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: IEEE Transactions on Magnetics, 2015, Vol.51(11)
    Keywords: Ferromagnetism – Analysis ; Magnesium Compounds – Magnetic Properties ; Thin Films – Magnetic Properties
    ISSN: 0018-9464
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of Advanced Ceramics, 2018, Vol.7(2), p.169(9)
    Description: Continuous silicon carbide fiber reinforced silicon carbide matrix (Si[C.sub.f]/SiC) composites are attractive candidate materials for aerospace engine system and nuclear reactor system. In this paper, Si[C.sub.f]/SiC composites were fabricated by polymer infiltration and pyrolysis (PIP) process using KD-S fiber as the reinforcement and the LPVCS as the precursor, while the BN interface layer was introduced by chemical vapor deposition (CVD) process using borazine as the single precursor. The effect of the BN interface layer on the structure and properties of the Si[C.sub.f]/SiC composites was comprehensively investigated. The results showed that the BN interface layer significantly improved the mechanical properties of the KD-S Si[C.sub.f]/SiC composites. The flexure strength and fracture toughness of the KD-S Si[C.sub.f]/SiC composites were evidently improved from 314 [+ or -] 44.8 to 818 [+ or -] 39.6 MPa and 8.6 [+ or -] 0.5 to 23.0 [+ or -] 2.2 Mpa*[m.sup.1/2], respectively. The observation of TEM analysis displayed a turbostratic structure of the CVD-BN interface layer that facilitated the improvement of the fracture toughness of the Si[C.sub.f]/SiC composites. The thermal conductivity of KD-S Si[C.sub.f]/SiC composites with BN interface layer was lower than that of KD-S Si[C.sub.f]/SiC composites without BN interface layer, which could be attributed to the relative low thermal conductivity of BN interface layer with low crystallinity. Keywords: silicon carbide (SiC); composites; interface layer; polymer infiltration and pyrolysis (PIP); boron nitride (BN)
    Keywords: Composite Materials – Production Processes ; Composite Materials – Properties ; Boron Nitride – Usage ; Silicon Carbides – Usage
    ISSN: 2226-4108
    Source: Cengage Learning, Inc.
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