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US 11,913,879 B2Granted
Non-dispersive infrared sensor
AssigneeFocus Universal Inc.
InventorDesheng Wang
Life of this patent
Estimating the term…
Abstract
Disclosed is a sensor and method for detecting one or more gasses in a sample. The sensor includes two sample tube sections, which allow for a larger sample, and correspondingly, more accurate measurement. Having two sample tube sections increases the total length of the sample path. However, placing the sample tube sections in parallel allows for the performance of the sensor to be enhanced, but the footprint of the sensor to remain unchanged. Light pipe material may be used to transport the light between sample tube sections. Further, light pipe material may be used to move the IR lamp away from the first filter tube section, reducing problems in the thermopile by dissipating heat from the IR lamp away from the sample tube section.
Claims20
A sensor for detecting the presence of one or more gasses, comprising:
- an IR lamp which generates light in the IR spectrum;
- a first light pipe section having a first end portion and a second end portion, the first end portion abutting the IR lamp and the first light pipe section passing the light through from the first end portion to the second end portion;
- a first sample tube section receiving light from the first light pipe section, the first sample tube section having a first interior containing a first sample, the first sample including a mix of gases from the local atmosphere, the IR spectrum light passing through the interior of the first sample tube section to a second end portion of the first sample tube section;
- a second light pipe section having an arcuate shape so that a first end and a second end of the second light pipe section face the same direction, the first end portion of the second light pipe section located adjacent to a second end portion of the first sample tube section, the second light pipe section receiving the light at the second end portion of the first sample tube section and transmitting the light from the first end portion to a second end portion;
- a second sample tube section with a first end portion and a second end portion, the first end portion of the second sample tube section located adjacent to the second end portion of the second light pipe section, the first end portion of the second sample tube section receiving the light from the second end of the second light pipe section, the second sample tube section having a second interior containing a second sample, the second sample including the mix of gases from the local atmosphere, the light passing through the interior of the second sample tube section to a second end portion of the second sample tube section;
- a first filter located at the second end portion of the second sample tube section, the first filter bandpassing only a band of IR spectrum light centered on a wavelength indicative of the presence of a gas in the mix of gases from the local atmosphere;
- and
- a first detector located behind to the first filter, the detector detecting the amount of IR spectrum light in the band of IR spectrum light.
5 more elements
A method for detecting the presence of a gas in a sample, comprising:
- providing an IR lamp, the IR lamp generating light in the IR spectrum;
- directing the IR spectrum light in to a first interior of a first sample tube section, the first sample tube section including a second end portion, the first interior of the first sample tube section containing a first sample of a mix of gasses from the local atmosphere;
- transporting the IR spectrum light through a light pipe material;
- directing the IR spectrum light in to a second sample tube section placed in parallel with the first, the second sample tube section having a second interior, the second interior containing a second sample of a mix of gasses from the local atmosphere;
- and
- detecting a filtered band of the IR spectrum light, the filtered band being centered on a detection wavelength, a reduced amount of filtered IR spectrum light at the detection wavelength being indicative of the presence of a gas which absorbs IR spectrum light at the detection wavelength.
3 more elements
A sensor for detecting the presence of one or more gasses, comprising:
- an IR lamp which generates light in the IR spectrum;
- a first sample tube section receiving light from the IR lamp, the first sample tube section having a first interior containing a first sample, the first sample including a mix of gases from the local atmosphere, the IR spectrum light passing through the interior of the first sample tube section to a second end portion of the first sample tube section;
- a flexible light pipe section including a first end portion and a second end portion, and having an arcuate shape so that a first end portion and a second end portion of the flexible light pipe section face the same direction, the first end portion of the flexible light pipe section located adjacent to a second end portion of the first sample tube section, the second light pipe section receiving the light at the second end portion of the first sample tube section and transmitting the light from the first end portion to the second end portion;
- a second sample tube section including a first end portion and a second end portion, the first end portion of the second sample tube section located adjacent to the second end portion of the second light pipe section, the first end portion of the second sample tube section receiving the light from the second end portion of the second light pipe section, the second sample tube section having a second interior containing a second sample, the second sample including the mix of gases from the local atmosphere, the light passing through the interior of the second sample tube section to a second end portion of the second sample tube section;
- a filter located at the second end portion of the second sample tube section, the filter bandpassing a band of IR spectrum light centered on a detection wavelength, the detection wavelength indicative of the presence of a gas in the mix of gases from the local atmosphere;
- and
- a detector located next to the filter, the detector detecting the amount of IR spectrum light at the detection wavelength.
4 more elements
Dependencies are inferred from the claim text.