Resources Contact Us Home
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
Flat panel display device and method of fabricating the same
Semiconductor device
Writing implement
Analog to digital converter with increased sub-range resolution
Wound dressings
Methods and system for providing drug pricing information from multiple pharmacy benefit managers (PBMs)
  Randomly Featured Patents
Cosmetic applicator
Hybrid draper belt splice
High efficiency ventilation system
Apparatus for containing toxic spills employing hybrid thermosyphons
Cooling system for a two component furnace roof
Oxyranyle-triazoline thiones and their use as microbicides
Method of manufacturing self-adhering footwear
Device for performing the purifying separation of crystals out of their suspension in a contaminated crystal melt
Semiconductor device, method of manufacturing the same, and method of forming multilayer semiconductor thin film
Vehicle air outlet with uniform precision feel to operator