Electrode system for a parallel plate dielectric analyzer

• US 4,899,102 A
• Filed: 04/12/1989
• Issued: 02/06/1990
• Est. Priority Date: 06/13/1988
• Status: Expired due to Fees

• Current Assignee: TA Instruments, Inc. (Waters Corporation)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Reader, John R. Jr., Hendrick, Kendall B.
• Primary Examiner(s): EISENZOPF, REINHARD
• Assistant Examiner(s): Miele, Anthony L.
• Application Number:
  US07/337,131
• Time in Patent Office: 300 Days
• Field of Search: 324/57 R, 324/61 R, 324/61 P, 324/158 P, 324/104, 324/105, 324/106, 73/805, 73/790, 374/51, 374/143, 100/93 P
• US Class Current: 324/663
• CPC Class Codes: G01B 7/14 for measuring distance or clearance between spaced objects or spaced apertures G01B7/30 takes precedence
• CPC Class Codes: G01N 27/226 Construction of measuring vessels; Electrodes therefor
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24

Abstract

A parallel plate dielectric analyzer is disclosed including:

(a) a distance sensor for accurately measuring the varying distance between the electrodes, such as a linear voltage differential transformer (LVDT), and means responsive to the distance sensor for positioning the electrodes;

(b) a force transducer for measuring the applied force on the sample and means responsive to the force transducer to give a desired force by varying the electrode spacing;

(c) disposable electrodes made using thick film technology composed of a ceramic substrate with a conductor adhered to its surface; and

(d) a temperature sensor built into one of the electrodes such as a platinum ring adhered to the surface of one of the electrodes and means to measure the resistance across the platinum ring.

Claims

1. An electrode system comprising a support means, a response electrode which has a ceramic substrate and is detachably attached to said support means by mechanical means and an excitation electrode which has a ceramic substrate with a temperature sensor adhered to the surface of said ceramic substrate.

2. The excitation electrode of claim 1 wherein the temperature sensor is a metallic strip.

3. The excitation electrode of claim 2 wherein the metallic strip consists essentially of platinum.