公开(公告)号：US20180306680A1

公开(公告)日：2018-10-25

申请号：US15769458

申请日：2016-10-24

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Jia Hu ,  Daniel A. Temple

IPC: G01N1/22 ,  G01N33/00

CPC classification number: G01N1/22 ,  G01N33/0014

Abstract: A gas sensor assembly having a chamber that can be open to allow a sensor to sample and monitor the air for gases and can be passively closed to protect the sensor from water and contaminants. The assembly includes a tube having one end coupled to the chamber with an air passage and an opposite open end. When a level of water in the tube rises through the open end, air with positive pressure in the chamber and tube prevents the water from reaching the gas sensor. Instead of using positive air pressure, the tube can include a sealing member such as a float to close the air passage and protect the gas sensor.

公开(公告)号：US20190137450A1

公开(公告)日：2019-05-09

申请号：US16074121

申请日：2017-01-23

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Stephen J. Willett ,  Erik A. Aho ,  Eric J. Alfuth ,  Benjamin P. Heppner ,  Richard L. Rylander ,  Benjamin K. Stein ,  Daniel A. Temple

IPC: G01N29/036 ,  G01N29/34 ,  G01N29/42

Abstract: Resonant acoustic gas sensors and methods for operating acoustic gas sensors that improve detection and reduce power consumption through the use of dynamic thresholds for identifying resonance peaks and optimizing searching for subsequent resonance peaks. The resonant acoustic gas sensors may use one or two separate transducers to produce the electronic signal that is filtered and used to identify the resonance peaks, using either voltage or impedance values to identify resonance peaks and use the resonance peaks to determine the composition of the gas mixture being measured.