fig1
Figure 1. Respiration sensor design and working mechanism. (A) Full design of the respiration sensor showing parts that can be taken apart; (B) Ring-type PHMR sensor (left) and neodymium magnet embedded within a 1 mm-thick PDMS membrane (right); (C) Breathing demonstration using the respiration sensor; (D) Schematic showing the positive and negative air pressure applied on the respiration sensor. PHMR: Planar Hall magnetoresistance; PDMS: polydimethylsiloxane.
