Fuji Xerox Co., Ltd.

Wako Industrial Co., Ltd.

Yukio Adachi

Shin-ichi Hirasawa

Takeshi Yoshitome

A hydraulic oil filtration apparatuscomprises an actuation control valve V, a pump-pressure oil passage, a connection oil passage, a tank oil passage, a return filter, a drain oil passage, a drain filterand an aspirator structure. The actuation control valve V controls to charge and discharge a hydraulic actuator A such as a boom cylinderand travel motors with hydraulic oil from a hydraulic pump P, which is connected through the pump-pressure oil passageto the actuation control valve V The hydraulic actuator A is connected with the actuation control valve V by the connection oil passage, and the actuation control valve V is connected to a tank T by the tank oil passage, in which the return filteris provided. The part of the tank oil passagedownstream with respect to the return filteris connected to the hydraulic pump P by the drain oil passage, in which the drain filteris provided. The aspirator structureis positioned at the junction between the tank oil passageand the drain oil passage, so that leakage oil in the drain oil passageis drawn by the flow of the discharged oil through the tank oil passageand led to the drain filter

Hydraulic oil filtration apparatus

An excitation wavelength sweeping type Raman spectroscopic apparatus including a wavelength variable laser source, a laser beam converging unit for irradiating a laser beam from the laser source onto a specimen, a bandpass filter for selecting a beam of a predetermined wavelength out of Raman scattered light beams emitted from the specimen, and a photodetecting unit for detecting the beam selected by the bandpass filter. In the apparatus, a Raman spectrum of the specimen is measured by sweeping the wavelength of the laser beam.

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Kanagawa, Japan

Yukio Adachi