Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method of and system for real time differential pulse detection










Image Number 10 for United States Patent #4500391.

An electrochemical detection cell which includes, in the order named, a stack of components constituted by a first membrane, an electrode carrier having reference and counter electrodes thereon, a membrane support, an electrode carrier having a sensing electrode thereon, and a permselective membrane. Whatman filter papers are positioned between the sensing electrode and both the counter electrode and reference electrode, these being positionable in a central rectangular opening of the membrane support. The cell allows air or gas ambient to address the membranes and effects application of an electrolyte to space between the electrodes by, for example, a wick which extends between an electrolyte-containing reservoir and the Whatman filter papers. A system for detecting a gaseous agent uses the aforementioned detection cell coupled with circuitry capable of applying a fixed DC voltage bias to the reference electrode and superimposing a train of DC voltage pulses on the fixed bias. Further circuitry is coupled to and responsive to signals from the sensing electrode. This circuitry determines the difference between the sensing electrode signal at the end of each pulse minus that just before each pulse. The difference is proportional to the concentration of the test gas in the atmosphere adjacent to the sensor, and is a more specific and sensitive indication of the test gas concentration than prior art sensors.








 
 
  Recently Added Patents
Display apparatus
(4944
Ion implantation method and ion implantation apparatus
Embedded package and method for manufacturing the same
Viewing stand
Hedge shear
Animation control apparatus, animation control method, and non-transitory computer readable recording medium
  Randomly Featured Patents
Automatic slurry strainer
Purse
Golf club head
Photochemical isotope separation
Matching engine for comparing data feeds with user profile criteria
Waste stopper arrangement
Computational structure having multiple stages wherein each stage includes a pair of adders and a multiplexing circuit capable of operating in parallel
Force applying device for scoring wheels
Method of making a tube using a cylinder air cooled heat welder
Photographic film containing direct positive dyes made from 3-indolizine carboxaldehyde