Method and apparatus for detection of LVDT core fallout condition

US8712710B2 · kind B2 · utility

Assignee

• HONEYWELL INTERNATIONAL INC. · US

Inventors

• Rakesh Damodaran Nair · Bengaluru, IN
• Arulvel Sellamuthu · Viralimalai, IN
• Nagaraja Sundaresh · Survanagiri, IN
• Manjunatha Kotreshi Alabur · Bengaluru, IN
• Amol Kinage · Bengaluru, IN
• Karthik Giritharan · Bengaluru, IN
• Ananda Huchappa Shastry · Bengaluru, IN

Key dates

• Filing date: May 13, 2011
• Grant date: Apr 29, 2014
• Expiry date: Oct 12, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/24457
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method includes measuring a first voltage (VA) across a first sensing coil of a linear variable differential transformer (LVDT) and measuring a second voltage (VB) across a second sensing coil of the LVDT. The method also includes signaling a core fallout condition in response to (i) determining that a ratio of VA and VB is within a specified range of a value of one and (ii) determining that a sum of VA and VB is less than a sum of VA0 and VB0 by more than a specified amount. VA0 and VB0 are minimum voltages across the first and second sensing coils of the LVDT, respectively, when a core of the LVDT is in the LVDT.