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
Pyrrolidine-1,2-dicarboxamide derivatives
Multi charged particle beam writing apparatus and multi charged particle beam writing method
Display window with level of service graphical user interface
Requirements model comparative analysis method for effort estimation in customizing a network monitoring and control system
Lighting fixture
Method and system for modularized configurable connector system for ethernet applications
Character input device and program for displaying next word candidates based on the candidates' usage history
  Randomly Featured Patents
Flexible splint
Machine tool with an active electrical generator for power generation
Cell jacket
Modular entertainment and gaming system configured to capture raw biometric data and responsive to directives from a remote server
Stabilization of lead bearing waste
Automatic releasing seat belt
Pneumatic method and device for diesel engine braking and restarting in the reverse direction
Rotating mechanism for a crystal ball
Fill-in light emitting apparatus and still video camera
Profile searching in nucleic acid sequences using the fast fourier transformation