• Title/Summary/Keyword: 함수 현상

Search Result 3, Processing Time 0.059 seconds

Phenomenology of the concept of functions (함수 개념의 현상학)

  • Yoo, Yoon-Jae
    • Journal for History of Mathematics
    • /
    • v.23 no.3
    • /
    • pp.75-90
    • /
    • 2010
  • In this paper function concept is classified in the phenomenological aspect. According to the study, function concept is classified as causality, designation, operation, change, figure, morhism, variables, functional, and operator. This classifications are categorized as pre-level function, basic level function, and upper level function.

Temperature measurements using optical retarder (광 위상지연기를 이용한 온도측정)

  • 전상민;김용평
    • Korean Journal of Optics and Photonics
    • /
    • v.13 no.3
    • /
    • pp.240-244
    • /
    • 2002
  • We proposed a novel temperature sensor based on the phenomena that the phase difference between principal polarization states in an optical retarder is a function of temperature. The polarization state of an optical beam is changed as it passes through the optical retarder, with the change dependent on the temperature. The temperature of the optical retarder is determined by comparison of the power difference between principal polarization states. A temperature sensor was successfully implemented using a polarization maintaining fiber of length 100 mm as the optical retarder. The change rate of phase difference on temperature was 0.236$^{\circ}C$$_{-1}$ and the measurement error was $\pm$0.038$^{\circ}C$ over the temperature region of -2.6$^{\circ}C$~3.4$^{\circ}C$.

Measurements of optical wavelength using WDM coupler (WDM 결합기를 이용한 광파장 측정)

  • 이현우;김용평
    • Korean Journal of Optics and Photonics
    • /
    • v.12 no.5
    • /
    • pp.389-393
    • /
    • 2001
  • A wavemeter is realized using the fact that the coupling coefficient of a WDM coupler is a function of wavelength. Prototype devices with 1500 nm/1600 nm and 1510 nm/1550 nm WDM couplers are successfully fabricated and tested in the laboratory. The measurement resolutions are $\pm$0.27 nm over a wavelength range of 1515 nm~1576 nm for the device with 1500 nm/1600 nm WDM coupler and $\pm$0.103 nm over a wavelength range of 1520 nm~1543 nm for th4e device with 1510 nm/1550 nm WDM coupler. The dependence of operating characteristics on the input signal power is insignificant. However the temperature dependence is ~0.06 nm/$^{\circ}C$.

  • PDF