Method and system for mobile steam leak detection

• US 8,643,716 B1
• Filed: 02/13/2009
• Issued: 02/04/2014
• Est. Priority Date: 02/13/2008
• Status: Active Grant

• Current Assignee: Osmose Utilities Services Incorporated (Osmose Holdings Incorporated)
• Original Assignee: Power Survey LLC
• Inventors: Kalokitis, David, Chang, Peng, Schepps, Jonathan Lloyd
• Primary Examiner(s): Doan, Duyen
• Application Number:
  US12/371,362
• Time in Patent Office: 1,817 Days
• Field of Search: 348/84, 348/125, 340588- 59, 340/622, 340/625
• US Class Current: 348/125
• CPC Class Codes: G01M 3/002 by using thermal means

Abstract

A method and system for steam leak detection. The method comprises obtaining real-time temperature data representing a heat dissipation of a steam pipe along a steam pipe route, processing the real-time temperature data in real-time to determine at least one indication of a potential steam leak based on the real-time temperature data and to generate a processed image for display, and displaying the processed image to depict the heat dissipation of the steam pipe.

Claims

1. A method for steam leak detection, comprising:

obtaining real-time temperature data representing a heat dissipation of a steam pipe along a steam pipe route;

processing the real-time temperature data in real-time to determine at least one indication of a potential steam leak based on the real-time temperature data and to generate a processed image for display, wherein processing the real-time temperature data comprises comparing the real-time temperature data to geo-registered baseline data; and

displaying the processed image to depict the heat dissipation of the steam pipe.

2. The method of claim 1, wherein the processed image comprises at least one of an indication of at least one relevant structure or at least one difference indicia indicating at least one difference between the real-time temperature data and the geo-registered baseline data.

3. The method of claim 2, wherein the at least one difference indicia is determined by:

detecting the at least one relevant structure represented in the real-time temperature data;

extracting relevant temperature data pertaining to the at least one relevant structure from the real-time temperature data;

geo-registering the relevant temperature data to a fixed reference to generate geo-registered relevant temperature data;

selecting the geo-registered baseline data; and

detecting at least one difference between the geo-registered relevant temperature data and the geo-registered baseline data.

4. The method of claim 3, wherein the detecting the at least one relevant structure comprises:

generating a binary image from the real-time temperature data;

filtering the binary image utilizing a plurality of geometric filters to generate a plurality of filtered binary images;

selecting a best match from the plurality of filtered binary images; and

evaluating the best match for at least one of hot pixel density, temporal smoothness, or size.

5. The method of claim 4, wherein the generating a binary image utilizes an adaptively selected temperature threshold, the adaptively selected temperature threshold determined based on at least one of a temperature distribution of the real-time temperature data, historical temperature data of the steam pipe route, or ambient conditions of the steam pipe route.

6. The method of claim 3 wherein the extracting comprises filtering data from the real-time temperature data that exceeds a desired spatial range around the at least one relevant structure.

7. The method of claim 3, wherein the geo-registering comprises:

utilizing at least one known calibration parameter of an infrared (IR) sensor performing the obtaining real-time temperature data to obtain mobile unit referenced coordinates for the relevant temperature data; and

utilizing at least one geographical reference tool to project the mobile unit referenced coordinates onto geographical coordinates.

8. The method of claim 3, wherein the geo-registering comprises utilizing at least one of (i) global positioning system (GPS) coordinates or (ii) at least one of the at least one relevant structures represented in the real-time temperature data and at least one relevant structure represented in the geo-registered baseline data.

9. The method of claim 3, wherein the detecting at least one difference utilizes at least one of a video comparison of pixels or a processing method for comparing data sets comprising x-axis and y-axis temperature-related data points.

10. The method of claim 2, wherein the geo-registered baseline data is obtained by:

detecting the at least one relevant structure represented in previously obtained temperature data along the steam pipe route;

extracting relevant baseline data pertaining to the at least one relevant structure from the previously obtained temperature data;

geo-registering the relevant baseline data to a fixed reference to generate geo-registered relevant baseline data; and

processing the geo-registered relevant baseline data.

11. The method of claim 10, wherein the processing the geo-registered relevant baseline data comprises at least one of filtering the geo-registered relevant baseline data or reducing the geo-registered relevant baseline data to a data set comprising temperature-related parameters associated with geographical coordinates.

12. The method of claim 2, wherein the geo-registered baseline data is comprised of a data set of temperature-related parameters associated with geographical coordinates.

13. A system for steam leak detection comprising:

an infrared (IR) sensor for obtaining real-time temperature data representing a heat dissipation of a steam pipe along a steam pipe route;

a temperature data processing system for processing the real-time temperature data in real-time to determine at least one indication of a potential steam leak based on the real-time temperature data and to generate a processed image for display, wherein processing the real-time temperature data comprises comparing the real-time temperature data to geo-registered baseline data; and

an image display system for displaying the processed image in real-time to depict the heat dissipation of the steam pipe.

14. The system of claim 13 wherein the temperature data processing system comprises:

a temperature data capture subsystem for capturing the real-time temperature data from the IR sensor; and

a temperature data analysis subsystem for performing the processing and storing at least one of the geo-registered baseline data, at least a portion of the real-time temperature data, or temperature-related parameters derived from the real-time temperature data.

15. The system of claim 13, wherein the processed image comprises at least one of an indication of at least one relevant structure or at least one difference indicia indicating at least one difference between the real-time temperature data and the geo-registered baseline data.

16. The system of claim 13, wherein the image display system comprises a real-time image display for displaying at least one of the real-time temperature data or the processed image.

17. The system of claim 13, wherein the IR sensor is a forward looking infrared (FLIR) A40M IR camera.

18. The system of claim 13, wherein the temperature data processing system is a commercially available laptop computer.

19. The system of claim 13, wherein the temperature data processing system further comprises a global positioning system (GPS) unit for providing geographical coordinate information.

20. The system of claim 15, wherein the geo-registered baseline data is comprised of a data set of temperature-related parameters associated with geographical coordinates.