SYSTEM AND METHOD FOR DISTRIBUTION OF SENSORS FOR EMERGENCY RESPONSE

• US 20150310731A1
• Filed: 02/12/2015
• Published: 10/29/2015
• Est. Priority Date: 04/25/2014
• Status: Active Grant

• Current Assignee: Industrial Scientific Corporation (Fortive Corp.)
• Original Assignee: SAFER Systems, LLC (Fortive Corp.)
• Inventors: Khajehnajafi, Shahryar, Shahraz, Azar
• Granted Patent: US 9,595,183 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G08B 21/12 responsive to undesired emission of substances, e.g. pollution alarms
• CPC Class Codes: G08B 29/18 Prevention or correction of operating errors G08B29/02, G08B29/12 take precedence

Abstract

A system and method for placement of sensors for sensing hazardous substances released from a plurality of hazard points. A processor identifies a location of a hazard point, a fence line of the plant-site, and a toxic level of concern (LOC) for the hazardous substance. The processor calculates a minimum amount of the hazardous substance (Q) for which a concentration at a centerline of a plume carrying the hazardous substance reaches the toxic LOC at the fenceline, and simulates a release of the hazardous substance in the calculated amount Q from the hazard point. The processor further calculates a pair of sensor locations where the concentration of the plume is equal to the minimum detectable concentration level of sensor based on the simulated release. The pair of sensor locations is then output by the processor.

Claims

1. A system for selecting placement of sensors for sensing a hazardous substance released from a plurality of hazard points, the system comprising:

a processor; and

a memory, wherein the memory has instructions stored therein that, when executed by the processor, cause the processor to;

identify a location of a hazard point;

identify a fenceline surrounding the hazard point;

identify a toxic level of concern (LOC) for the hazardous substance;

calculate a minimum amount of the hazardous substance (Q) for which a concentration at a centerline of a plume carrying the hazardous substance reaches the toxic LOC at the fenceline;

simulate a release of the hazardous substance in the calculated amount Q from the hazard point;

calculate locations of a pair of sensors where a minimum level of concentration of the hazardous substance is detected by the pair of sensors based on the simulated release; and

output the locations of the pair of sensors.

2. The system of claim 1, wherein the location is identified via two numbers in a Cartesian coordinate system, a first one of the two numbers corresponding to a downwind distance from the hazard point, and a second one of the two numbers corresponding to a crosswind distance from the centerline of the plume, at the downwind distance from the hazard point.

3. The system of claim 1, wherein the calculated locations are locations on the fenceline.

4. The system of claim 1, wherein the instructions that cause the processor to simulate the release include instructions that cause the processor to run a dispersion model.

5. The system of claim 1, wherein the instructions cause the processor to assume a wind direction in calculating the locations of the pair of sensors.

6. The system of claim 1, wherein the instructions cause the processor to calculate a degree of wind rotation in calculating the locations of the pair of sensors.

7. The system of claim 1, wherein the output locations of the pair of sensors is stored in the memory.

8. The system of claim 1, wherein the instructions further cause the processor to:

identify locations of other pairs of sensors associated with remaining hazard points in all calculated wind rotation angles;

identify the sensors with overlapping coverage of the hazard points;

find, from the identified sensors, sensors with maximum coverage of the hazard points; and

remove unnecessary sensors from the identified sensors.

9. The system of claim 8, wherein the finding of the sensors is based on a criterion that determines the sensor with maximum source coverage.

10. The system of claim 8, wherein the finding of the sensors is based on a criterion that identifies the sensor with a maximum number of wind directions for which the sensor is effective.

11. The system of claim 8, wherein the finding of the sensors is based on a criterion that determines the sensor with maximum coverage length of the fenceline.

12. A method for selecting placement of sensors for sensing a hazardous substance released from a plurality of hazard points, the method comprising:

identifying, by a processor, a location of a hazard point;

identifying, by a processor, a fenceline surrounding the hazard point;

identifying, by a processor, a toxic level of concern (LOC) for the hazardous substance;

calculating, by a processor, a minimum amount of the hazardous substance (Q) for which a concentration at a centerline of a plume carrying the hazardous substance reaches the toxic LOC at the fenceline;

simulating, by a processor, a release of the hazardous substance in the calculated amount Q from the hazard point;

calculating, by a processor, locations of a pair of sensors where concentration is equal to a minimum detectable level of concentration by the pairs of sensors based on the simulated release; and

outputting, by a processor, the locations of the pair of sensors.

13. The method of claim 12, wherein the location is identified wherein the location is identified via two numbers in a Cartesian coordinate system, a first one of the two numbers corresponding to a downwind distance from the hazard point, and a second one of the two numbers corresponding to a cross wind distance from the centerline of the plume, at the downwind distance from the hazard point.

14. The method of claim 12, wherein the calculated locations are locations on the fenceline.

15. The method of claim 12, wherein the release is simulated by running a dispersion model.

16. The method of claim 12, wherein the processor assumes a wind direction in calculating the locations of the pair of sensors.

17. The method of claim 12, wherein the processor calculates a degree of wind rotation in calculating the locations of the pair of sensors.

18. The method of claim 12, wherein the output location of the at least one sensor is stored in memory.

19. The method of claim 12 further comprising:

identifying, by the processor, locations of other pairs of sensors associated with remaining hazard points in all calculated wind rotation angles;

identifying, by the processor, the sensors with overlapping coverage of the hazard points;

finding, by the processor, from the identified sensors, sensors with maximum coverage of the hazard points; and

removing, by the processors, unnecessary sensors from the identified sensors.

20. The method of claim 12, wherein the finding of the sensor is based on a criterion that determines the sensor with maximum source coverage.

21. The method of claim 12, wherein the finding of the sensor is based on a criterion that identifies the sensor with a maximum number of wind directions for which the sensor is effective.

22. The system of claim 12, wherein the finding of the sensor is based on the criterion that determines the sensor with maximum coverage length of the fenceline.