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公开(公告)号：US20230375723A1
公开(公告)日：2023-11-23
申请号：US18027360
申请日：2021-09-21
Applicant: Airthings ASA
Inventor： Bjørn Magne SUNDAL
CPC classification number: G01T1/178 , G01N33/0055 , H05K1/183 , H05K2201/10106 , H05K2201/10545
Abstract: A sensor, comprising: a printed circuit board; a detector mounted on the printed circuit board; an inner dome that is electrically conductive and is mounted on the printed circuit board so as to form a diffusion chamber around the detector; and an outer dome that is electrically conductive and surrounding the inner dome. The dual dome construction allows a stronger electric field to be generated inside the inner dome. The strength of the electric field is determined by the voltage of the detector, the voltage of the inner dome and the distance between them. The detector has a maximum voltage that can safely be applied to it without damaging the detector. With the dual dome design, the inner dome can be biased to a higher potential, thereby increasing the strength of the electric field inside the inner dome, while still shielding that high voltage via the outer dome.
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公开(公告)号：US20230384463A1
公开(公告)日：2023-11-30
申请号：US18027362
申请日：2021-09-21
Applicant: Airthings ASA
Inventor： Bjørn Magne SUNDAL
Abstract: A radon gas sensor comprising: a diffusion chamber; a photodiode positioned inside the diffusion chamber; and a photomultiplier positioned inside the diffusion chamber; wherein a scintillating material is provided on at least a part of an inner surface of the diffusion chamber. The photomultiplier detects more alpha particles, but cannot distinguish the energies of different alpha particles. On the other hand, the photodiode can distinguish different decays because the magnitude of the signal generated by the photodiode is proportional to the kinetic energy of the alpha particle striking it. Thus, the photodiode produces spectral data. The spectral data is used to estimate the amount of Polonium that is adhering to aerosols. This is used to apply a correction factor to the data to provide a better estimate of the true Radon concentration in the chamber. This can be combined with the count data of the photomultiplier for overall improved data.
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公开(公告)号：US20230375724A1
公开(公告)日：2023-11-23
申请号：US18027361
申请日：2021-09-21
Applicant: Airthings ASA
Inventor： Bjørn Magne SUNDAL
CPC classification number: G01T1/178 , G01N33/0055 , H05K1/183 , H05K2201/10106 , H05K2201/10545
Abstract: A sensor comprising: a printed circuit board; a photosensor mounted on a first side of the printed circuit board; and a light source mounted on a second, opposite side; wherein the light source is arranged to transmit light through at least a portion of the printed circuit board, which is impermeable to air. Positioning of the light source on the opposite side of the printed circuit board from the photosensor means that the bulk of the printed circuit board lies between the light source and the photosensor, obstructing direct transmission of light from the light source to the photosensor. However, light can be transmitted through the printed circuit board itself without drilling a hole through the printed circuit board. In this way, the light source can be mounted on the opposite side of the printed circuit board from the photosensor while still transmitting light to the photosensor.
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