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公开(公告)号：US20190257803A1
公开(公告)日：2019-08-22
申请号：US16259915
申请日：2019-01-28
Applicant: Apple Inc.
Inventor： Michael K. BROWN , Roham SOLASI , Miaolei YAN
Abstract: A portable communication device includes a first gas sensor, one or more second gas sensors, at least one port and a calibration module. The first gas sensor is disposed on a first hotplate and is enclosed in an enclosure. The one or more second gas sensors are disposed on one or more second hotplates and are also enclosed in the enclosure. The ports can allow flow of air into and out of the enclosure. The second gas sensors are stable gas sensors, which are used by the calibration module to calibrate the first gas sensor.
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