Patent · US Expired

Gas thermometer

US5123750A · kind A · utility

2Cited by

6References

20Claims

0Family size

Assignee

Heraeus Sensor GmbH · DE

Inventors

Horst Ziegler · Berlin, DE
Horst Behlen · Paderborn, DE

Key dates

Filing date	May 7, 1990
Grant date	Jun 23, 1992
Priority date	—
Expiry date	May 7, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG01K11/24
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A gas thermometer has a case with a case end section (10) made of metal of good thermal conductivity and a main case section (14) made of material of poor thermal conductivity. By means of separating walls (46, 48, 62, 64, 70) and reflector walls (66, 68), two sound paths are created in the interior of the thermometer case, which differ by twice the distance between the reflector walls (66, 68). The phase difference of partial sound wave fields which are obtained by splitting a sound wave field produced by a common sound generator (40) between the two paths is converted to an electrical signal corresponding to the temperature in the case end section (10) by using microphones (26, 28) and an analyzing circuit (92) connected with them.

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