Double-sided diaphragm micro gas-preconcentrator
US8969976B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2012 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Apr 13, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A double-sided diaphragm micro gas-preconcentrator has a micro-gas chamber which is formed by bonding an upper silicon substrate with a lower silicon substrate. One or more suspended membranes are provided on every silicon substrate. The silicon where the suspended membrane is provided is completely removed for forming a cavity. A thin-film heater is deposited on every suspended membrane. A sorptive film is coated on an inner wall of every suspended membrane. Thus, the upper and lower sides of the preconcentrator in the present invention are suspended membranes, which improve the area of the sorptive film on the diaphragm. As a result, the preconcentrating factor is improved while keeping the small heat capacity, fast heating rate, and low power consumption features of the planar diaphragm preconcentrator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.