Horiba, Ltd.

Shuzi Takada

Masahiko Ishida

Hiroshi Fujii

Ryosuke Fukushima

Tatsuhide Tsutsui

An oil concentration meter includes a sample cell for receiving an oil sample that can be irradiated with infrared rays from a light source. A first interference filter having a design wavelength of 3.4 .mu.m is positioned before a measuring detector, while a second interference filter transmitting a band range between 1 .mu.m and 5 .mu.m is positioned in front of a reference detector. A logarithm of the ratio of the reference detector output to the measuring detector output is used for determining the oil concentration in a sample.

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Kyoto, Japan

Shuzi Takada