Patent · US Expired

Method and apparatus for determining internal temperature of an object

US4137769A · kind A · utility

30Cited by
3References
14Claims
0Family size

Inventor

Key dates

Filing dateFeb 6, 1978
Grant dateFeb 6, 1979
Priority date—
Expiry dateFeb 6, 1998

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01K3/04
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A material visually changeable with changing temperature is incorporated internally in a transparent solid body having physical dimensions and thermal conductivity and diffusivity characteristics selected to provide a thermal analog of an object. The object and its analog are exposed to equivalent ambient conditions, concurrently, resulting in a visible change in the thermal analog corresponding to the internal temperature change in the object. The temperature indicating material may include a single transition temperature or multiple temperature indicating materials may be incorporated to display a plurality of transition temperatures and may be reversible or irreversible.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.