Patent ID: 9513242
Filing Date: 2016-12-06
CPC Classification: G01N

Claim Text:
1. A humidity sensor comprising: a first substrate having a recess formed in a first side; a second substrate; an insulating layer supported by the second substrate; the second substrate and the insulating layer supported by the first side of the first substrate and extending over the recess to form a diaphragm, with the insulating layer facing the recess; a trench in the second substrate extending around or substantially around the diaphragm, the trench at least partially filled with an oxide to thermally insulate the diaphragm from a remainder of the second substrate; a resistive heater element supported by the diaphragm; a pair of sensing electrodes electrically separated from each other and supported by the diaphragm; and a sensing material disposed over the pair of sensing electrodes, wherein an electrical property of the sensing material is configured to change in response to a change in moisture content of the sensing material.