Yokogawa Electric Corporation

Masayoshi Honma

Shin-Ichirou Tezuka

Satoshi Matsuura

Yoshihiro Kumagai

Akihiko Ito

Takashi Tsuneoka

Shin-ichirou Tezuka

An optical fiber characteristic measurement device () includes a light detector () configured to detect Brillouin scattered light (LS) obtained by causing light to be incident on an optical fiber (FUT); a signal processor () configured to obtain, on the basis of a detection signal (S) which is output from the light detector, a first Brillouin gain spectrum (B) which is a spectrum of the Brillouin scattered light obtained in a case where a spectral width of the light incident on the optical fiber is a first width and a second Brillouin gain spectrum (B) which is a spectrum of the Brillouin scattered light obtained in a case where the spectral width of the light incident on the optical fiber is a second width larger than the first width; and a measurer () configured to measure characteristics of the optical fiber on the basis of the first Brillouin gain spectrum and the second Brillouin gain spectrum.

Optical fiber characteristic measurement device, optical fiber characteristic measurement program, and optical fiber characteristic measurement method for measuring characteristics of optical fiber based on Brillouin gain spectrum

An optical fiber characteristic measurement device () includes a photodetector (A) which detects Brillouin scattered light (LS) obtained by causing light to be incident on an optical fiber (FUT), an intensity acquisitor (A) which acquires a signal intensity at a prescribed reference frequency (f, f) from a detection signal (S, S, S) output from the photodetector, and a measurer (A,B) which measures characteristics of the optical fiber by obtaining a peak frequency of a Brillouin gain spectrum, which is a spectrum of the Brillouin scattered light, from the signal intensity at the reference frequency acquired by the intensity acquisitor.

Optical fiber characteristic measurement device and optical fiber characteristic measurement method

A signal detecting device includes a multiplier that multiplies a measurement signal by a reference signal, a filter that filters a multiplication result from the multiplier, a first storage that stores an internal state of the filter; and a second storage that stores a filtering result from the filter. The filter filters the multiplication result using the internal state stored in the first storage. The first storage switches an area in or from which the filter writes or reads the internal state in accordance with an index signal representing a type of amplitude of a time-divisional signal in the measurement signal. The second storage switches an area in which the filtering result is stored in accordance with the index signal.

Signal detecting device and optical fiber characteristics measuring device

A battery characteristic simulating apparatus is provided for supplying electric power for simulating a battery characteristic of a battery to a battery-driven type electronic appliance. The battery characteristic simulating apparatus includes a voltage/current generating unit; a voltage/current measuring unit; a characteristic data acquiring unit; a storage unit; and a simulation signal producing unit that are provided within the same housing of the battery characteristic simulating apparatus.

Battery characteristic simulating apparatus

A data control apparatus has a user interface section, an operation control section which operates based on an instruction from the user interface section, a USB device interface section which is connected to an external equipment, and controls USB communications with the external equipment, a file system control section which transfers data to and from the operation control section, and controls a file, an internal storage which stores data from the file system control section and data from the external equipment, and a USB mass storage class control section which controls a USB mass storage class, wherein the USB device interface section controls so that the external equipment identifies the data control apparatus as an external storage, and transfers to and from the external equipment.

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Musashino, Japan

Masayoshi Honma