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  1. No Access

    Article

    Microwave-Dimensional Measurements of Cylindrical Resonators for Primary Acoustic Thermometry

    Acoustic gas thermometry relies on the fundamental relationship between the speed of sound in a monatomic gas and its thermodynamic temperature. The speed of sound is calculated from the resonance frequencies ...

    R. J. Underwood, G. J. Edwards in International Journal of Thermophysics (2014)

  2. No Access

    Article

    A Novel Comparative Photothermal Method for Measuring Thermal Diffusivity

    A novel comparative method has been developed at the National Physical Laboratory (NPL) to measure the thermal diffusivity of semi-infinite samples without a priori knowledge of the boundary conditions. It is bas...

    M. Broussely, A. P. Levick, G. J. Edwards in International Journal of Thermophysics (2005)

  3. No Access

    Article

    Measurement of the Thermal Diffusivity of Solids with an Improved Accuracy

    A photothermal radiometry technique is being developed at the NPL with the goal of improving the accuracy of thermal diffusivity measurements. The principle is to perform a laser-induced thermal experiment whi...

    C. D. Martinsons, A. P. Levick, G. J. Edwards in International Journal of Thermophysics (2003)

  4. No Access

    Article

    A temperature-dependent dispersion equation for congruently grown lithium niobate

    G. J. Edwards, M. Lawrence in Optical and Quantum Electronics (1984)

  5. No Access

    Chapter and Conference Paper

    Progress with a Determination of the Speed of Light

    The scheme for measuring the CO2 laser frequency (shown in the Introduction) consists of three separate frequency-mixing experiments using two lower-frequency lasers as transfer oscillators. If an accurate measur...

    T. G. Blaney, C. C. Bradley, G. J. Edwards… in Atomic Masses and Fundamental Constants 4 (1972)

  6. No Access

    Chapter and Conference Paper

    Progress with a Determination of the Speed of Light

    Until recently the direct measurement of frequencies in the infra-red spectral region has not been possible because of the lack of suitable detectors and mixers with response times of the order of 10−13 to 10−14 ...

    C. C. Bradley, G. J. Edwards, D. J. E. Knight in Atomic Masses and Fundamental Constants 4 (1972)