David M Quinn

US Patent:

8447385, May 21, 2013

Filed:

Jul 28, 2010

Appl. No.:

12/845447

Inventors:

Fred Sterzer - Princeton NJ, US
Daniel D. Mawhinney - Livingston NJ, US
Laleh Rabieirad - Ithaca NY, US
David E. Quinn - Auburn NY, US
John A. Lane - Weedsport NY, US
Matthew D. Mullin - Memphis NY, US
Charles N. Stewart - Skaneateles NY, US

Assignee:

Welch Allyn, Inc. - Skaneateles Falls NY

International Classification:

A61B 5/055
A61B 5/00
G01J 5/00

US Classification:

600430, 600549, 374122

Abstract:

A microwave handheld radiometer for measuring subsurface tissue temperature of a subject includes a microwave antenna disposed relative to a handheld radiometer housing and adapted to electromagnetically couple to a skin surface of a subject, a circulator having a first circulator input and a second circulator input, wherein the first circulator input is electrically coupled to said antenna via a microwave feedline. A switch is electrically disposed between the antenna and an microwave feedline, said switch having a calibrate state and a measure state. A noise source, electrically coupled to the circulator, is being configured to provide a first source of thermal noise at a first temperature and a second source of thermal noise at a second temperature, wherein the noise source is switched between the first source and second source upon external command wherein a detector provides an output wherein surface temperature effects are corrected for the sub-surface measurement.