Frank E Liebmann

US Patent:

7607309, Oct 27, 2009

Filed:

Jun 14, 2006

Appl. No.:

11/453713

Inventors:

Frank E. Liebmann - American Fork UT, US
David W. Farley - Orem UT, US
Richard W. Walker - Alpine UT, US
Michael W. Hirst - Lindon UT, US
Allen E. Sjogren - Park City UT, US

Assignee:

Fluke Corporation - Everett WA

International Classification:

F25B 21/02

US Classification:

62 33, 62 37

Abstract:

A temperature calibration device uses Peltier cells for heating and cooling. The Peltier cells are connected to a relay that connects the cells to each other in one configuration for heating and a different configuration for cooling. The Peltier cells also receive supply voltages having different magnitudes and polarities for heating and cooling. By changing the manner in which the Peltier cells are connected to each other and using different supply voltages for heating and cooling, the cells are able to operate closer to their specified maximum temperature differential without sacrificing the useful life of the cells.

US Patent:

7661876, Feb 16, 2010

Filed:

Nov 14, 2007

Appl. No.:

11/940277

Inventors:

Frank E. Liebmann - American Fork UT, US

Assignee:

Fluke Corporation - Everett WA

International Classification:

G01K 15/00
G01J 5/00
G01N 25/00

US Classification:

374 2, 374 1, 374121, 374129, 374126, 374 9, 374128

Abstract:

Infrared Ir Thermometer Calibration Systems and Methods are Disclosed in which the temperature of an IR thermometer calibration system is controlled such that radiation emitted by a target at a given input temperature is equal to the radiation emitted by a graybody heated to the input temperature and having an emissivity equal to an emissivity setting of an IR thermometer to be calibrated using the IR thermometer calibration system.

US Patent:

7669427, Mar 2, 2010

Filed:

Jun 14, 2006

Appl. No.:

11/453781

Inventors:

Richard W. Walker - Alpine UT, US
Frank E. Liebmann - American Fork UT, US

Assignee:

Fluke Corporation - Everett WA

International Classification:

F25B 21/02

US Classification:

62 37, 62 32, 622592

Abstract:

A temperature calibration device uses Peltier cells for heating and cooling. The Peltier cells are driven by a power controller that gradually changes the power applied to the Peltier cells from a starting power to a target power. However, during this transition, the power controller holds the power applied to the Peltier cells constant for a period to minimize the stress on the Peltier cells. This period of constant period may last until the temperature of an object reaches a predetermined temperature, or it may have a fixed or variable duration, which may be based on the difference between the starting power and the target power. By changing the power applied to the Peltier cells in this manner, the useful life of the Peltier cells is preserved.

US Patent:

8117848, Feb 21, 2012

Filed:

Oct 26, 2009

Appl. No.:

12/606023

Inventors:

Frank E. Liebmann - American Fork UT, US
David W. Farley - Orem UT, US
Richard W. Walker - Alpine UT, US
Michael W. Hirst - Lindon UT, US
Allen E. Sjogren - Park City UT, US

Assignee:

Fluke Corporation - Everett WA

International Classification:

F25B 21/02

US Classification:

62 33, 62 37

Abstract:

A temperature calibration device uses Peltier cells for heating and cooling. The Peltier cells are connected to a relay that connects the cells to each other in one configuration for heating and a different configuration for cooling. The Peltier cells also receive supply voltages having different magnitudes and polarities for heating and cooling. By changing the manner in which the Peltier cells are connected to each other and using different supply voltages for heating and cooling, the cells are able to operate closer to their specified maximum temperature differential without sacrificing the useful life of the cells.

US Patent:

8177421, May 15, 2012

Filed:

Jan 4, 2010

Appl. No.:

12/651906

Inventors:

Frank E. Liebmann - American Fork UT, US

Assignee:

Fluke Corporation - Everett WA

International Classification:

G01K 15/00
G01K 1/26
G01J 5/00

US Classification:

374 2, 374120, 374129

Abstract:

Infrared IR thermometer calibration systems and methods are disclosed in which the temperature of an IR thermometer calibration system is controlled such that radiation emitted by a target at a given input temperature is equal to the radiation emitted by a graybody heated to the input temperature and having an emissivity equal to an emissivity setting of an IR thermometer to be calibrated using the IR thermometer calibration system.

US Patent:

20070290871, Dec 20, 2007

Filed:

Jun 14, 2006

Appl. No.:

11/453782

Inventors:

David W. Farley - Orem UT, US
Frank E. Liebmann - American Fork UT, US
Allen E. Sjogren - Park City UT, US

International Classification:

G08B 21/00

US Classification:

340635, 340640

Abstract:

An externally powered temperature calibration device includes a system that provides a warning of high temperatures within the device after the device has been disconnected from the external power. The warning system includes a capacitor that provides power to a light-emitting diode (“LED”) after the calibration device has been disconnected from the external power. A temperature sensor monitors the temperature of an internal component. An output signal from the sensor is used to control a switch that connects the capacitor to one of several resistors having different resistances. The switch therefore controls the discharge rate of the capacitor based on the sensed temperature at the time the calibration device was disconnected from the external power. As a result, the period during which the capacitor powers the LED can be commensurate with the time required for the internal component to cool from its initial temperature.