Asahi Kasei Microdevices Corporation

Shota Isshiki

Takaaki Furuya

Edson Gomes Camargo

Keiichiro Kuwata

Yuji Ikeda

A small-sized gas detection apparatus with high measurement accuracy is provided. The gas detection apparatus includes a light emitting portion (); a light receiving portion (); a first mirror () that has a quadric reflective surface and reflects light emitted from the light emitting portion; and a second mirror () that has a quadric reflective surface and reflects the light reflected by the first mirror to the first mirror. The quadric surfaces of the first mirror and the second mirror have convex portions facing in a same direction. The first mirror reflects the light reflected by the second mirror to the light receiving portion. When one surface of a substrate on which the light emitting portion and the light receiving portion are mounted is used as a reference plane, the first mirror and the second mirror are provided at positions higher than the reference plane and have different heights.

Gas detection apparatus

A gas sensor comprises first and second light emitting parts, first and second light receiving parts, and first and second optical path regions, wherein the optical path regions have a common region, a first light receiving part has a larger rate of change of an output signal with respect to a first gas than a second light receiving part, the second light receiving part has a larger rate of change of an output signal with respect to an second gas than the first light receiving part, the first light receiving part has a sensitivity peak wavelength closer to a first wavelength in an absorption wavelength band of the first gas than the second light receiving part, and the second light receiving part has a sensitivity peak wavelength closer to a second wavelength in an absorption wavelength band of the second gas than the first light receiving part.

Gas sensor

A gas detection devicecomprises: a light emitterconfigured to emit light of a wavelength band including a wavelength absorbed by a detection target gas; a light detectorhaving sensitivity to the wavelength band; a package; a light guideconfigured to guide the light to the light detector; a jointjoining the packageand the light guide; and a heat insulatorlocated in a gap between the packageand the light guide, wherein part of a surface of the packagefacing the light guidehas a proximity region D where a distance between the packageand the light guideis 500 μm or less, and at least part of the heat insulatorand at least part of the jointare located adjacent to each other in part of the proximity region D.

Gas detection device

An optical concentration measurement device includes an LED light source, alight receiving unit having a rectangular light receiving surface and outputting a detection signal representing intensity of received light, and light guiding units guiding light emitted by the LED light source to the light receiving unit, wherein a shape on the rectangular light receiving surface of light radiated on the light receiving surface is rectangular, the optical concentration measurement device measures concentration of an object to be measured existing in a light path formed by the light guiding units, based on the detection signal output from the light receiving unit, and the light guiding units guide light at a diffraction limit or greater in such a way that area of the light on the rectangular light receiving surface is ½ or less of area of the rectangular light receiving surface.

Optical concentration measurement device comprising light receiving unit with a rectangular light receiving surface

Provided is a gas sensor comprising first and second light emitting parts, first and second light receiving parts, a first optical path region and a second optical path region, wherein the optical path regions have a common region, an optical path length of the first optical path region is longer than that of the second optical path region, a rate of change of an output signal with respect to a gas to be measured of the first light receiving part is larger than that of the second light receiving part, a rate of change of an output signal with respect to an interference gas of the second light receiving part is larger than that of the first light receiving part, and a sensitivity peak wavelength of the second light receiving part overlaps with an absorption wavelength of water vapor.

The optical concentration measuring deviceincludes: a first optical filter; a second optical filter; and an operation part, wherein a difference between a peak wavelength of the first effective sensitivity spectrum based on the first transmission band in the first light receiving partand a peak wavelength of the second effective sensitivity spectrum based on the second transmission band in the second light receiving partis &#xb1;0.2 times or more and &#xb1;0.8 times or less the full width at half maximum of the first effective sensitivity spectrum, wherein the operation part removes an attenuation amount of the first intensity by the interference gas and an attenuation amount of the second intensity by the interference gas.

Optical concentration measuring device, module for optical concentration measuring device and optical concentration measuring method

A stable and highly accurate gas detections apparatus is provided. A gas detection apparatusincludes a light emitting elementprovided on a main surfaceof the substratefor emitting light from a light emitting surface; a light receiving elementprovided on the main surfaceof the substratefor receiving the light on a light receiving surface; and a light guide memberfor guiding the light emitted by the light emitting elementto the light receiving element. In plan view of the main surface of the substrate, the light emitting surfaceand the light receiving surfaceare shaped to have corners, and side of the light emitting surfaceafter being subjected to a magnification or reduction and a translation do not overlap sides of the light receiving surface

An optical concentration measurement device includes an LED light source, alight receiving unit having a rectangular light receiving surface and outputting a detection signal representing intensity of received light, and light guiding units guiding light emitted by the LED light source to the light receiving unit, wherein a shape on the rectangular light receiving surface of light radiated on the light receiving surface is rectangular, the optical concentration measurement device measures concentration of an object to be measured existing in a light path formed by the light guiding units, based on the detection signal output from the light receiving unit, and the light guiding units guide light at a diffraction limit or greater in such a way that area of the light on the rectangular light receiving surface is &#xbd; or less of area of the rectangular light receiving surface.

Growing community of inventors

Tokyo, Japan

Shota Isshiki