Jiri Pribil, B. Zatko, Ivan Frollo, F. Dubecký, Pawel Grybos
PORTABLE X–RAY CT MINI SYSTEM BASED ON MONOLITHITIC SEMI-INSULATING GAAS DETECTORS USING PERSPECTIVE IMAGING RECONSTRUCTION TECHNIQUES

The work describes the present status of development of the portable X–ray CT mini system. The system is capable to operate also as a quantum digital X–ray scanner. Detection unit is constructed from double line of 2 × 1024 SI GaAs pixel detectors with pitch of 250 µm. The system allows operation in the single photon counting regime and the energy separation (one energy window) with estimated spatial resolution higher than 125 µm. Developed modification of the X–ray image reconstruction based on perspective imaging techniques has been experimentally verified on testing phantoms and practically implemented for processing images of real test objects.

Ichirou Ishimaru, Takashi Takuma, Shinji Yabushita, Takeshi Kawajiri, Kana Yanogawa, Takaki Harada, Kazuya Yamamoto
PROPOSAL OF IMAGING-TYPE 2-DIMENSINAL FOURIER SPECTROSCOPY

We proposed the imaging-type 2-D Fourier spectroscopy that is the phase-shift interferometry between the objective lights. The proposed method can measure the 2D spectral image at the limited depth. Because of the imaging optical system, the 2D spectral images can be measured in high spatial resolution. And in the depth direction, we can get the spectral distribution only in the focal plane. In this report, we mention about the principle of the proposed imaging-type 2-D Fourier spectroscopy.

Gerd Wübbeler, Rolf Judaschke, Clemens Elster
ESTIMATION OF RESIDUAL ERROR PARAMETERS FOR VECTOR NETWORK ANALYZERS

Recently, a novel approach for the estimation of the residual error parameters of a calibrated vector network analyzer has been proposed. The method is based on a reflection measurement employing a high precision airline terminated by a short. From this measurement the complex valued residual error parameters are calculated utilizing a sophisticated data analysis scheme. In this work the uncertainty associated with the obtained residual error parameters is evaluated. The uncertainty evaluation is performed by applying the GUM S1 approach employing a Monte-Carlo method. Resulting uncertainties arising due to imperfections of the dimensional parameters of the airline are presented.

Yoshito Isei, Tatsuro Honda, Kenichi Akahane, Hideyuki Takahashi
DEVELOPMENT OF REFRACTORY THICKNESS METER FOR TORPEDO LADLE CAR

To inspect the refractory of torpedo ladle car at high temperature is effective in expanding its service life and reducing its maintenance cost, preventing metal break out. As to metal impact area, the refractory thickness could not be inspected by thermal analysis of outer steel shell. The refractory thickness meter was installed at torpedo repair shop for evaluating its measurement stability and refractory thickness measurement accuracy. It has two surface profile maters using laser rangefinder equipped with two tilt stages, facing each other. It measures the inner refractory profile and the outer steel shell profile at one time to calculate the accurate refractory thickness without influence of the outer shell deformation. After 90 minutes from discharging molten iron, it could achieve stable measurement without the influence of fume and heat haze, and could measure the refractory thickness with a good accuracy of 7.3mm (1 sigma).

Clemens Elster, Sascha Eichstädt, Alfred Link, Thomas Bruns
REAL-TIME DYNAMIC ERROR COMPENSATION OF ACCELEROMETERS BY DIGITAL FILTERING

The output signal of an accelerometer typically contains dynamic errors when a broadband acceleration is applied. In order to retrieve the applied acceleration, post-processing of the accelerometer's output signal is required. To this end, we propose the application of a digital filter. We describe the construction of an appropriate filter and consider the uncertainty associated with the filtered output signal. Explicit formulae can be employed to calculate both, the filtered output signal and its associated uncertainty, in real-time. We illustrate the need and benefit of the proposed approach in terms of an example.