Horiba, Ltd.

Masahiko Ishida

Toshikazu Ohnishi

Syuji Takada

Shigeyuki Akiyama

Masahiko Fujiwara

Kimio Miyatake

Kennosuke Kojima

Shuji Takada

Satoshi Inoue

Hiroshi Fujii

Ryosuke Fukushima

Tatsuhide Tsutsui

Shuzi Takada

An optical detector wherein detection elements and are provided in a sealed case whose opening portion is blocked with a window material for transmitting light such as an infrared and an ultraviolet ray therethrough, the detection elements being formed opposite to the window material; and optical filters and are disposed between the window material and the detection elements and and used for selecting and causing only light composed of a predetermined band of wavelengths to be transmitted by thin optical films in connection with the detection elements and . The optical detector includes a shielding body having housing portions and for containing the optical filters and and used for preventing any light composed of other than the predetermined band of wavelength selected by the thin optical films and preventing light producing an interference effect during measurement from being transmitted through the optical filters and

Optical detector

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.

Infrared oil-concentration meter

A gas analyzer capable of simultaneously detecting two or more components in a single-cell mode and a gas-analyzing mechanism suitable for simultaneously detecting two or more components in a cross-flow modulation single-cell mode are provided. A gas analyzer unit includes two measuring cells, light sources provided on one end side of each of the measuring cells, gas filter cells with interferential gaseous components hindering a detection of components to be measured enclosed provided on the other end side of each of the measuring cells, beam splitters included in two gas filter cells, first- and fourth and second- and third detectors provided on the side of transmitting position and the side of reflecting position, respectively, of each of the beam splitters and a sampling device connected with a rotary valve.

Gas analyzer and gas-analyzing mechanism

A measuring instrument that must transmit predetermined wavelengths of optical radiation has an optical filter assembly that can be conveniently manufactured. The optical filter assembly can be coated to provide optical coatings on either side of the substrate, and a masking layer can be deposited to encompass the peripheral edges of the optical coatings and exposed portions of the substrate to eliminate the problem of optical noise resulting from optical radiation contact with the edges of the coating layers.

Optical filter for measurement of combustion gases and method of

An infrared ray detector assembly for detecting a plurality of components such as hydrocarbons, CO.sub.2 and CO gases includes a housing member having a hollow interior and a portion transmissible to infrared rays and a holder member mounted within the hollow interior and having a plurality of separate compartments. An infrared detector is mounted in each compartment, and an optical filter is mounted over each compartment, abutting adjacent filters to respectively limit the wavelength band to each infrared detector, each optical filter having a substrate of approximately the same material and thickness.

Infrared ray detector with multiple optical filters

Three stacks composed of high refractive index substance layers and low refractive index substance layers, which are alternately arranged, are formed on one side of a substrate. Of the three stacks, the central stack has a number of layers which are about half the number of all the layers and each individual layer is set so as to be a desired optical quarter-wave thickness. Two stacks are arranged on opposite sides of said central stack, which stacks each have a number of layers of about 1/4 times the number of all the layers and which are set so as to be different in optical thickness from each other and different from the desired quarter wave optical thickness of the central stack layers, said stack combination being capable of easily producing a multi-layer interference filter having good spectrometic characteristics.

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Kyoto, Japan

Masahiko Ishida