Electronic devices with breath sensing systems

Abstract

An electronic device may include sensors such as a breath sensor. The breath sensor may be aligned with a sensor window in the housing and may be configured to gather breath measurements through the sensor window without the use of a mouthpiece. The breath sensor may be a non-dispersive infrared breath sensor having an infrared light source and an infrared light detector. The infrared light source may emit infrared light through the sensor window and the infrared light detector may detect the infrared light after it passes through a volume of breath containing a target gas molecule that serves as a biomarker for a given health condition. Control circuitry in the electronic device may analyze the breath measurements to determine a concentration of the target gas molecule and may compare the concentration with database information to determine whether a user has the given health condition.

Dependencies are inferred from the claim text.