Yokogawa Electric Corporation

Hosei University

Kabushiki Kaisha Toshiba

Ando Electric Company

Prospira Corporation

Yoshinori Matsumoto

Jun Katsuyama

Mitsuru Shinagawa

Akishige Ito

Takashi Tsubota

Hiroaki Tanaka

Masato Ishikawa

Takashi Fukuyama

Moritoshi Komamaki

Toyoaki Hamaguchi

Fumiaki Arie

Hiroyuki Sugimura

Kazuya Ichinowatari

A measurement device includes an electric field generator, an electric field detector, a thickness gauge, and a processor. The electric field generator generates an alternating current electric field. The electric field detector detects the alternating current electric field generated by the electric field generator. The thickness gauge measures a thickness of a measurement target in a non-contact manner. The processor derives a calibration curve representing a relationship between a specific dielectric constant and an intensity of an alternating current electric field. The measurement target is insertable between the electric field generator and the electric field detector. The electric field detector detects an intensity of the alternating current electric field attenuated by the measurement target. The processor calculates a specific dielectric constant of the measurement target based on the detected intensity of the alternating current electric field, the measured thickness, and the derived calibration curve.

Measurement device and measurement method

An electric field sensor includes a light source; an electro-optical crystal, a first separator, a first wavelength plate, first and second light receivers, a differential amplifier, and a controller. The electro-optical crystal has light from the light source incident thereon and receives an electric field generated by an object. The first separator separates light emitted from the electro-optical crystal into a P wave and an S wave. The first wavelength plate changes a phase of light at a pre-stage of the first separator. The first and second light receivers receive the P wave and S-wave light respectively, and convert the received light into first and second electrical signals, respectively. The differential amplifier generates a differential signal between the first and second electrical signals. The controller adjusts a wavelength of the light source such that an output value of a direct-current component of the differential amplifier is within a value range.

Electric field sensor

An electric field sensor which measures an electric field generated by a target utilizing an electro-optic effect, the electric field sensor including a light source, an electro-optic crystal on which light in a predetermined polarization state emitted from the light source is incident and which is subjected to the electric field generated by the target, a reference electric field applicator configured to apply an electric field based on a reference signal with a known signal level to the electro-optic crystal, a light receiver configured to receive light emitted from the electro-optic crystal and to convert the received light into an electric signal, and a separation corrector configured to separate the electric signal into a measurement signal based on the electric field generated by the target and the reference signal and to correct a signal level of the measurement signal on the basis of the signal level of the separated reference signal.

A vibration-damping device body () is provided that includes a first mounting member () mounted on one of a vibration-generating portion and a vibration-receiving portion via a bracket (), a second mounting member () mounted on the other of the vibration-generating portion and the vibration-receiving portion, and an elastic body () connecting the first mounting member () and the second mounting member (). The first mounting member () is fitted into a fitting hole () formed in the bracket (). A first guide portion () is formed on an outer circumferential surface of the first mounting member (). A second guide portion (is formed on an inner circumferential surface of the fitting hole (). The first guide portion () is fitted into the second guide portion (). The first mounting member () is formed of a synthetic resin material, and a metal fitting () having first engagement surfaces () coming into contact with the second guide portion () is arranged on the first guide portios ().

Vibration-damping device body and vibration-damping device

A photoelectric conversion element evaluation apparatus includes: a probe light source that irradiates a photoelectric conversion element as the object of measurement with probe light; a pump light source that irradiates the photoelectric conversion element being irradiated with the probe light with pulsed pump light; and a light receiving element that detects time dependency of a change in an amount of the probe light obtained from the photoelectric conversion element.

Photoelectric conversion element evaluation apparatus

A satellite communication system and a data transmission method in satellite communication capable of improving the reliability of a system in satellite communication are provided. The satellite communication system of an embodiment includes a first communication device, a second communication device, and a slave station. The first communication device receives emergency information about disaster and transmits gate closing control data for issuing a command for closing a gate related to the disaster via a satellite. The second communication device is installed in a place geographically separated from the first communication device and receives emergency information about disaster and transmits gate closing control data for issuing an commands for closing a gate related to the disaster via a satellite. The slave station controls opening-closing of the gate on the basis of the gate closing control data received from the first communication device or the second communication device.

Satellite communication system controlling gate in an emergency

An inspection apparatus using polarized lights according to one aspect of the present invention includes an irradiator configured to irradiate an inspection target with a first plurality of lights. The first plurality of lights have different polarization states and different wavelengths from each other. The inspection apparatus further includes a light receiver configured to perform a wavelength demultiplexing of a second plurality of lights obtained from the inspection target to generate a third plurality of lights, to separately receive the third plurality of lights, and to output at least one light-receiving signal associated with the third plurality of lights and a processor configured to calculate at least one of an ellipse azimuth, a degree of polarization, and a polarization component intensity using the light-receiving signal and to determine whether the inspection target is defective or non-defective.

Inspection apparatus using polarized lights

An optical pulse generator includes a light emitting element that emits an optical pulse, and a driver. The driver is configured to apply a pulse driving current to the light emitting element to allow the light emitting element to emit an optical pulse. The driver is also configured to apply a preliminary driving current to the light emitting element prior to starting the application of the pulse driving current. The preliminary driving current is lower than a minimum level that needs to cause a stimulated emission of light.

Growing community of inventors

Tokyo, Japan

Yoshinori Matsumoto