Hitachi, Ltd.

Akira Fukuhara

Katsuhiro Kuroda

Seiji Yonezawa

Masuo Umemoto

Teruichi Tomura

Mitsuyo Nishikawa

Akira Tonomura

Nobuo Hamamoto

Tooru Kimura

Setsuo Nomura

Keizo Kato

Atsushi Momose

A tomograph makes use of phase information obtainable from a radiation beam having transmitted a to-be-inspected object. In one embodiment, the tomograph has an interferometer for producing interference infringes between a signal beam having transmitted through the object and a reference beam and eventually producing Moire fringes a detector for detecting the Moire fringes, and a signal processing unit for processing outputs of the detector.

Tomograph using phase information of a signal beam having transmitted

A monitor method for the combustion conditions in a furnace of a boiler having a plurality of burners is disclosed. The method includes the steps of detecting the flame intensity at a predetermined position of a flame, by using an optical fiber having as its view the predetermined position at the flame of each of the plurality of burners; judging if the combustion conditions of each burner are normal or not, based on if the flame intensity detected for each burner flame is within a predetermined normal level range; and displaying the judgement results. Preferably, an image fiber for obtaining a flame image indicating the combustion conditions is provided for at least one of the burners, and the normal level range is determined based on the flame image obtained by the image fiber.

Combustion monitor method for multi-burner boiler

The present invention provides an electron holography microscope producing an interference pattern having contour moire lines which is displayed on a cathode-ray tube. With the invention the three-dimensional structure of a specimen can be readily observed on the cathode-ray tube. The electron holography microscope of the present invention comprises a television camera which picks up the interference pattern a straight line fringe output means for delivering a straight line fringe pattern the direction and interval of which are selected at will. Outputs of the television camera and the means are added in a multiplier and the result is displayed on the cathode-ray tube.

Electron holography microscope

The apparatus for focus-deflecting a charged particle beam includes two electron lenses for focusing the charged particle beam and a single deflector for deflecting the charged particle beam to a desired position, wherein one of the electron lenses on the object point side and the deflector are arranged so that their magnetic fields overlap each other, and the aberration generated by them offsets that generated by the other of the electron lenses.

Apparatus for focus-deflecting a charged particle beam

In order to record information spirally on a disk and to reproduce the recorded information accurately without any contact, at the recording, an information signal and a predetermined signal for synchronous detection are added together, the resultant signal is subjected to frequency modulation and, while a laser beam intensity-modulated by the frequency-modulated signal is minutely swung in the radial direction of the rotating disk at the same frequency as that of the synchronous detection signal, it is caused to impinge on the disk to thereby record the information spirally on a recording medium of the disk without any contact. During the reproduction, as the disk is being rotated, a light spot is caused to impinge along an information groove formed on the disk, and reflected light or transmitted light from the disk is detected in the form of an electric signal. A synchronous detection signal is derived from the electric signal and an envelope signal of the electric signal is synchronously rectified by the use of the snychronous detection signal to thus detect the offset between the light spot and the information groove and, as the offset is being corrected, the information signal is reproduced.

Growing community of inventors

Hachioji, Japan

Akira Fukuhara