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Volume 11, Issue 2
Displaying 1-8 of 8 articles from this issue
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Tadahiro SEKIMOTO1983 Volume 11 Issue 2 Pages 119-120
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
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Kenichi YOSHIDA1983 Volume 11 Issue 2 Pages 121-128
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
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Totaro IMASAKA, Nobuhiko ISHIBASHI1983 Volume 11 Issue 2 Pages 129-137
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
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Yoshiro SUEMOTO1983 Volume 11 Issue 2 Pages 138-144
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA calibration method for the laser heterodyne vibration measurement is described that includes generation of phase modulated signals simulating vibrations of various frequencies and amplitudes and construction of a calibration curve by making use of the measured relationship between the amplitude of the simulating signals and the output of the phase demodulator. The calibration curve for a general vibration that has its frequency components within the range from 100Hz to 30kHz, was obtained in the present experimental equipment. Validity of the calibration method was assured by the scanning laser heterodyne technique.View full abstractDownload PDF (705K) -
Toshio SAKURAI, Nobuhiko ITO, Jun ISHIKAWA1983 Volume 11 Issue 2 Pages 145-152
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA scanning Fabry-Perot interferometer with capacitive aluminium mesh mirrors, which can roughly estimate the oscillation frequency of far-infrared (FIR) laser for its direct frequency measurement, has been developed. The mesh-mirror separation is measured by using a visible laser interferometer (He-Ne 633nm) of frings counting type which is associated with the FIR interferometer. Using the Fabry-Perot interferometer, wavelengths of three FIR oscillation lines have been measured for evaluating its measurement error. It has been found that uncertainties in the wavelength measurements are estimated to be less than ± 0.1μm. This vale is small enough to carry out the direct frequency measurement.View full abstractDownload PDF (866K) -
Toyohiko YATAGAI, Masahide ITOH, Makoto HINO, Ichirou TAKAHASHI, Hiroy ...1983 Volume 11 Issue 2 Pages 153-161
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe have performed photoacoustic micro-imaging using a microphone detection technique. A microcomputer controlled photoacoustic imaging system is developed. A sample on a sensitive photoacoustic cell is scanned mechanically and photoacoustic signals generated by a focused laser beam are detected with a condenser microphone and a lock-in amplifier. The magnitude and the phase images of photoacoustic signal are displayed on a TV monitor. To obtain a clearer sub-surface image, digital image enhancement techniques are employed. Spatial resolution of the present photoacoustic microscope is 15μm. Some subsurface images and a power transistor image are presented.View full abstractDownload PDF (1389K) -
Atsushi YOKOTANI, Hiroshi KOIDE, Kozo YAMAMURO, Takatomo SASAKI, Tatsu ...1983 Volume 11 Issue 2 Pages 162-171
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSLarge single crystals of potassium dihydrogen phosphate (KDP) have been grown by temperature decrease method for the purpose of a frequency converter in laser fusion. The article describes how large and transparent KDP crystals (about 5cm×5cm×9cm) have been obtained and discusses how to grow much morelarge crystals.View full abstractDownload PDF (1231K) -
Tadashi SUETA1983 Volume 11 Issue 2 Pages 172-175
Published: February 28, 1983
Released on J-STAGE: February 26, 2010
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