Masayoshi Kamiya

Analog data transmission through plastic optical fiber in robot with compensation of errors caused by optical fiber bending loss

A new type of analog data transmission system using a plastic fiber is proposed, where a direct intensity modulation scheme has been employed together with a differential amplifier to compensate for the transmission error caused by the optical fiber bending loss. This system was experimentally applied to transmit analog data of dimensions detected by the displacement sensor attached to the robot arm tip to the robot basement through the plastic optical fiber installed in the robot arm body.

Wavelength-division-multiplexed analog transmission through plastic optical fiber for use in factory communications

A simple inexpensive analog transmission system is realized using a dual-channel-color LED assembly, a plastic optical fiber, a dual-channel-color sensor assembly, and a crosstalk elimination circuit. The transmission system, covering DC to 10 kHz, has a distortion factor of less than 2% and a crosstalk of less than -40 dB, and is suitable for use in factory communications.

Data collection and transmission system for vibration test

This paper describes the vibration data collection and transmission system constructed using a pair of optical fiber signal transmission systems. One is a plastic optical fiber transmission system having a capability to correct error in transmitting vibration data through a movable plastic optical fiber. The transmission system was used to transmit vibration data from the noncontact vibration sensor attached to the robot arm to the robot basement through the plastic optical fiber installed in the robot arm. The other is a full duplex GI optical fiber transmission system, which was used to simultaneously transmit control data for shifting the position of the vibration sensor, a video signal for specifying the measuring position, and measured vibration data through a GI optical fiber. Since the scanning of the position of the vibration sensor was controlled by control data which was transmitted from the monitoring console room to the testing machine room during the scanning of the vibration sensor position, vibration of the components mounted on the device under test was satisfactorily read from the vibration sensor.

Transmission of Both Forced and Natural Vibration Data Using Optical WDM Signal Transmission System

Abstrect This paper describes the transmission system to transmit data of the frequency measurement obtained &om the forced and natural vibration using a simple optical wavelength-division-multiplexed (WDM) signal transmission system without the use of expensive optical couplers. This system consists of a dual channel LED assembly, a plastic optical fiber, a dual channel photosensor assembly, a crosstalk elimination circuit, and other electronic processing circuits. This system has such performance as a distortion factor of below 2 % and a crosstalk of below -40 dB at frequencies of DC to 10 kHz. Under strong electromagnetic field, this system was used to transmit data of the forced and natural vibrations, which are obtain from a printed circuit board, from a pair of vibration sensors in the testing room to the processing circuits to pick up specific vibration in the monitoring room. The experiment was successful. Both the forced and natural vibration data were simultaneously transmitted with reliability.

Full‐duplex analogue/digital data transmission using lasers coupled to GI fibre and its application

This paper describes a low-cost version of a full-duplex optical fibre analogue/digital data transmission link whose practical implementation is simplified by using a pair of laser diodes, each having a built-in photodiode for monitoring the laser output power, and its application to vibration test data transmission. The transmission link sends digital data of up to 9600 bps in one direction, and analogue data of DC to 100 kHz and image data specified by an NTSC colour video signal in the opposite direction, all at the same time through one GI optical fibre. Being simple in configuration and stable against noise, this type of link has a variety of applications within factory, home and offices. Copyright

Integrated data collection and transmission system for automatic environmental test data acquisition

This paper describes an improved integrated version of the data collection and transmission system, and its practical applications to automatic environmental test data acquisition. The new system, in which four optical data links are installed, integrates the measurement functions using PCs. The new system which characterizes automatic tests ensures simple and easy operation with reliability and safety against failures.

Proposal of Microjoining Method UsingShock Wave Generated by Femtosecond Laser Irradiation

Femtosecond laser is a type of ultrashort-pulse laser. Ultrashort-pulse laser irradiation generates high-pressure plasma and shock waves at the surface of the target. If the target is irradiated in water, the shock waves are enough to deform the target plastically. The authors proposed a new microjoining method using the shock waves accompanied by femtosecond laser irradiation. A thin wire was mounted in a fit bore drilled in a plate, and the laser was focused around the edge of the wire end face. The wire was deformed by shock waves generated by many laser pulses. After the laser irradiation, the deformed wire prevented the release of the plate, as well as the rivet connection. Some model tests were performed to examine forming properties and joining strength. Laser pulse energy, spot diameter and laser spot position influenced the deformed shape and joining strength. In the case of irradiation close to the wire edge, the deformed shape and joining strength varied. They were made stable by transferring the laser spot intermittently.