US 9,810,580 B2
Process conduit anomaly detection using thermal imaging
Jason Harold Rud, Mayer, MN (US)
Assigned to Rosemount Inc., Chanhassen, MN (US)
Filed by Rosemount Inc., Chanhassen, MN (US)
Filed on Mar. 25, 2014, as Appl. No. 14/224,814.
Prior Publication US 2015/0276491 A1, Oct. 1, 2015
Int. Cl. G01J 5/10 (2006.01); G01N 25/72 (2006.01); G01J 5/00 (2006.01)
CPC G01J 5/10 (2013.01) [G01N 25/72 (2013.01); G01J 2005/0077 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A diagnostic field device for detecting a condition of a process conduit which carries a process fluid in an industrial process, comprising:
an infrared detector comprising a plurality of pixels configured to receive infrared radiation from the process conduit and responsively provide a plurality of pixel outputs, wherein a first pixel of the plurality of pixels is configured to receive infrared radiation from a first location on the process conduit, a second pixel of the plurality of pixels is configured to receive infrared radiation from a second location on the process conduit and a third pixel configured to receive infrared radiation from a third location on the process conduit and responsively provide an output;
a memory containing thermal profile information related to outputs from the first, second and third pixels during normal operation of the industrial process;
a microprocessor configured to normalize the outputs from the first, second and third pixels using the thermal profile information contained in the memory and further configured to identify a process anomaly related to the condition of the process conduit based upon a nonlinear relationship between normalized outputs from the first, second and third pixels; and
output circuitry configured to provide a diagnostic output indicative of the identified process anomaly.