Gas sensor
First Claim
1. A gas sensor comprising:
- a first light source;
a first sensor unit and a second sensor unit disposed to receive light output from the first light source;
a first substrate having a first principal surface and a second principal surface opposite to the first principal surface, the first light source and the first sensor unit being provided on the first principal surface of the first substrate; and
a second substrate having a first principal surface and a second principal surface opposite to the first principal surface, the second sensor unit being provided on the first principal surface of the second substrate, whereinthe first sensor unit is disposed at a location where a first portion of light output from the first light source passes through the first substrate, is reflected off the second principal surface of the first substrate, and is returned through the first substrate to directly strike the first sensor unit,the second sensor unit is disposed at a location where a second portion of light output from the first light source radiates from the second principal surface of the first substrate, passes through the inside of the second substrate, and strikes the second sensor unit, andthe first substrate and the second substrate are two individual parts and physically separate from each other.
1 Assignment
0 Petitions
Accused Products
Abstract
A small-size reliable gas sensor that can reduce a measurement error can be provided. The gas sensor includes: a first light source (20); a first sensor unit (31) and a second sensor unit (32) disposed to receive light output from the first light source (20); a first substrate (41) having a first principal surface (411) on which the first light source (20) and the first sensor unit (31) are provided; and a second substrate (42) having a first principal surface (422) on which the second sensor unit (32) is provided. The first sensor unit (31) is disposed at a location where light output from the first light source (20) and reflected on the second principal surface (412) strikes the first principal surface (422) of the first substrate (41).
10 Citations
37 Claims
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1. A gas sensor comprising:
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a first light source; a first sensor unit and a second sensor unit disposed to receive light output from the first light source; a first substrate having a first principal surface and a second principal surface opposite to the first principal surface, the first light source and the first sensor unit being provided on the first principal surface of the first substrate; and a second substrate having a first principal surface and a second principal surface opposite to the first principal surface, the second sensor unit being provided on the first principal surface of the second substrate, wherein the first sensor unit is disposed at a location where a first portion of light output from the first light source passes through the first substrate, is reflected off the second principal surface of the first substrate, and is returned through the first substrate to directly strike the first sensor unit, the second sensor unit is disposed at a location where a second portion of light output from the first light source radiates from the second principal surface of the first substrate, passes through the inside of the second substrate, and strikes the second sensor unit, and the first substrate and the second substrate are two individual parts and physically separate from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31)
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27. A gas sensor comprising:
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a gas cell; a first light source; a first sensor unit and a second sensor unit disposed to receive light output from the first light source; a first substrate having a first principal surface and a second principal surface opposite to the first principal surface, the first light source and the first sensor unit being provided on the first principal surface of the first substrate; and a second substrate having a first principal surface and a second principal surface opposite to the first principal surface, the second sensor unit being provided on the first principal surface of the second substrate, wherein the first sensor unit is disposed at a location where a portion of light output from the first light source passes through the first substrate, is reflected off the second principal surface of the first substrate and is returned through the first substrate to directly strike the first sensor unit from the first substrate, and the second sensor unit is disposed at a location where light output from the first light source and then radiated from the second principal surface of the first substrate into the gas cell, passes through the inside of the second substrate, and strikes the second sensor unit, and the first substrate and the second substrate are two individual parts and physically separate from each other. - View Dependent Claims (35, 36, 37)
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32. A gas sensor comprising:
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a first light source; a first sensor unit and a second sensor unit disposed to receive light output from the first light source; a first substrate having a first principal surface and a second principal surface opposite to the first principal surface, the first light source and the first sensor unit being provided on the first principal surface of the first substrate; and a second substrate having a first principal surface and a second principal surface opposite to the first principal surface, the second sensor unit being provided on the first principal surface of the second substrate, wherein the first sensor unit is disposed at a location where a first portion of light output from the first light source passes through the first substrate, is reflected off the second principal surface of the first substrate, and is returned through the first substrate to directly strike the first sensor unit, and the second sensor unit is disposed at a location where a second portion of light output from the first light source radiates from the second principal surface of the first substrate, passes through the inside of the second substrate, and strikes the second sensor unit. - View Dependent Claims (33, 34)
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Specification