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Organic chemical sensor    
United States Patent5482678   
Link to this pagehttp://www.wikipatents.com/5482678.html
Inventor(s)Sittler; Fred C. (Victoria, MN)
AbstractIn this invention, a first sensor senses an organic gas, liquid or vapor and includes a first support having a first support surface with a layer of material fastened to it. In the presence of liquid, gas or vapor, the material swells and expands so as to vary at least one of its dimensions. Such expansion develops a stress at an interface between the first support surface and the material, and strain sensitive resistors detect the stress and produce an output which varies as a function of the stress at the interface. One of a pair of piezoresistors is located where there is increased stress and the other piezoresistor is disposed where there is reduced stress. If desired, a second sensor similar in structure to the first but exposed only to a reference organic liquid, gas or vapor temperature compensates the first. In another embodiment of the invention, an organic chemical responsive sensor includes a first support having a first support surface and a first capacitor plate fastened to the first support. A second support coupled to the first support spaces a second capacitor plate a distance away from the first plate. A material which expands in the presence of organic liquid, gas or vapor is applied to the first support surface so that upon expansion, the first support deflects and changes the distance between the two capacitor plates, thereby changing an electrical capacity between the plates. Another sensor of similar structure may optionally temperature compensate the first.
   














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Drawing from US Patent 5482678
Organic chemical sensor - US Patent 5482678 Drawing
Organic chemical sensor
Inventor     Sittler; Fred C. (Victoria, MN)
Owner/Assignee     Rosemount Inc. (Eden Prairie, MN)
Patent assignment
All assignments
Publication Date     January 9, 1996
Application Number     08/337,135
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     November 10, 1994
US Classification     422/90 73/24.06 422/68.1 422/82.01 422/82.02 422/94 422/98 436/72 436/139 436/149 436/151
Int'l Classification     G01N 019/10 G01B 007/16 G01M 003/04
Examiner     Housel; James C.
Assistant Examiner     Soderquist; Arlen
Attorney/Law Firm     Westman, Champlin & Kelly
Address
Parent Case     This is a Continuation of application Ser. No. 08/066,980, filed May 25, 1993, now abandoned.
Priority Data    
USPTO Field of Search     73/24.06 73/31.05 73/31.06 73/775 73/776 73/778 73/579 338/2 338/3 338/4 338/5 338/2 338/3 338/4 338/5 422/68.1 422/82.01 422/82.02 422/83 422/90 422/94 422/98 436/72 436/139 436/149 436/151
Patent Tags     organic chemical sensor
   
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What is claimed is:

1. An organic chemical sensor for sensing at least one of an organic gas, liquid and vapor, comprising:

a container having a deflectable portion;

an electrically non-conductive material disposed in the container, the material exposed to at least one of the organic gas, liquid and vapor and formed of a substance varying a first of its dimensions in the presence of at least one of the organic gas, liquid and vapor so as to deflect the deflectable portion; and

a sensor operably coupled at the deflectable portion for detecting deflection and having an output varying as a function of the deflection.

2. The organic chemical sensor of claim 1 wherein the electrically nonconductive material varies a first of its dimensions in the presence of the at least one of the organic gas, liquid and vapor selected from the group consisting of hydrocarbons, chlorohydrocarbons, fluorocarbons and silicarbons.

3. The organic chemical sensor of claim 1 wherein the material is formed of a substance reversibly varying a first of its dimensions in the presence of at least one of the organic gas, liquid and vapor.

4. The organic chemical sensor of claim 1 wherein the container includes a hole