US 2026/0086026 A1Published application

Breath sensor and breath measurement method

AssigneeAsahi Kasei Microdevices Corporation

InventorsYuta TAKAGI, Seiichi TOKUO

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Abstract

A potential difference between a first terminal and a second terminal of a light emitting element is maintained at a first value or more in a first measurement period, and is maintained at 0V or more and less than the first value in a third measurement period, a concentration of the measurement target gas is measured based on a second intensity of the light received by the light receiving element during a second measurement period which starts at a second timing that is later than a first timing at which the first measurement period starts and before a third timing at which the third measurement period starts and a fourth intensity of the light received by the light receiving element during a fourth measurement period which starts at a fourth timing that is later than the third timing and before a next occurrence of the first timing.

Claims20

Dependent claims

A breath sensor comprising:

a light source unit that has a light emitting element of a thermal radiation type including a filament and radiates light toward a measurement target gas related to breath;
and
a concentration measurement unit that has a light receiving element which receives at least a part of the light, and that measures a concentration of the measurement target gas, wherein
the light source unit has a first terminal and a second terminal,
the light emitting element is supplied, from the first terminal and the second terminal, with direct current power of which a polarity is switched based on a set condition,
in a first measurement period during which the direct current power is supplied to the light emitting element, the first measurement period being repeated for two or more times, an absolute value of a potential difference between the first terminal and the second terminal is maintained at a first value or more,
in a third measurement period that is different from the first measurement period, a third value, which is an absolute value of a potential difference between the first terminal and the second terminal is maintained to be 0V or more and less than the first value, and
the concentration measurement unit measures a concentration of the measurement target gas based on:
a second intensity of the light received by the light receiving element during a second measurement period which starts at a second timing which is later than a first timing at which the first measurement period starts and before a third timing at which the third measurement period starts;
and
a fourth intensity of the light received by the light receiving element during a fourth measurement period which starts at a fourth timing after the second measurement period has ended, and which is later than the third timing and before a next occurrence of the first timing at which the first measurement period starts again.

8 more elements

A measurement method of breath comprising:

supplying direct current power to a light source unit that includes a light emitting element of a thermal radiation type having a filament and has a first terminal and a second terminal, wherein the light emitting element emits light to be radiated to a measurement target gas related to breath;
and
measuring a concentration of the measurement target gas to which the light is radiated, by using a light receiving element that receives at least a part of the light;
wherein a direct current power of which a polarity is switched based on a set condition is supplied to the light emitting element from the first terminal and the second terminal,
in a first measurement period during which the direct current power is supplied to the light emitting element, the first measurement period being repeated for two or more times, an absolute value of a potential difference between the first terminal and the second terminal is maintained at a first value or more,
in a third measurement period that is different from the first measurement period, a third value, which is an absolute value of a potential difference between the first terminal and the second terminal is maintained to be 0V or more and less than the first value, and
a concentration of the measurement target gas is measured based on:
a second intensity of the light received by the light receiving element during a second measurement period which starts at a second timing that is later than a first timing at which the first measurement period starts and before a third timing at which the third measurement period starts;
and
a fourth intensity of the light received by the light receiving element during a fourth measurement period which starts at a fourth timing after the second measurement period has ended and which is later than the third timing and before a next occurrence of the first timing at which the first measurement period starts again.

7 more elements

Dependencies are inferred from the claim text.