Method for detecting a source of heat near a marine vessel

• US 20080174455A1
• Filed: 01/22/2007
• Published: 07/24/2008
• Est. Priority Date: 01/22/2007
• Status: Active Grant

• Current Assignee: Brunswick Corporation
• Original Assignee: Brunswick Corporation
• Inventors: Staerzl, Richard E.
• Granted Patent: US 7,476,862 B2
• Time in Patent Office: Days
• US Class Current: 340/984
• CPC Class Codes: G08B 21/086 by monitoring a perimeter outside the body of the water

Abstract

Two sensor units are mounted on opposite sides of a transom of a boat and directed to a common location behind the boat. The field of view of the two sensors overlaps behind the marine propulsion unit of the boat to detect the presence of a heat emitting object, such as a mammal. Housing structures contain infrared sensing elements, lenses, and light shields. Signals from four infrared sensing elements are received by a controller which reacts, with an alarm signal, when at least two of the four sensors detect a heat emitting object within their individual fields of view. False triggering can be reduced by not providing an alarm signal if only the two most inboard sensors detect the heat emitting object.

Claims

1. A method for detecting a heat source proximate a marine vessel, comprising the steps of:

monitoring a first field of view in a first direction from a first sensing device;

providing a first signal when a heat source is within said first field of view;

monitoring a second field of view in a second direction from a second sensing device;

providing a second signal when a heat source is within said second field of view;

receiving said first and second signals; and

determining the presence or absence of a heat source within a detection zone as a function of both of said first and second signals.

2. The method of claim 1, wherein:

said first sensing device contains a first infrared device; and

said second sensing device contains a second infrared device.

3. The method of claim 1, wherein:

said first and second sensing devices are attached to said marine vessel with said first and second fields of view directed in a rearward direction, said detection zone being defined by an intersection of said first and second fields of view which is located a preselected distance behind said marine vessel.

4. The method of claim 1, wherein:

said first sensing device is attached to a starboard side of a rearward portion of said marine vessel; and

said second sensing device is attached to a port side of said rearward portion of said marine vessel.

5. The method of claim 1, wherein:

said first sensing device comprises a first sensor and a second sensor, said second sensor being disposed closer to a centerline of said marine vessel than said first sensor; and

said second sensing device comprises a third sensor and a fourth sensor, said third sensor being disposed closer to said centerline of said marine vessel than said fourth sensor.

6. The method of claim 5, wherein:

said first, second, third, and fourth sensors are each configured to provide an individual signal representing the detection of said heat source within its individual field of view.

7. The method of claim 6, further comprising:

providing an alarm signal in response to receipt of individual signals from at least two of said first, second, third, and fourth sensors.

8. The method of claim 6, further comprising:

providing an alarm signal in response to receipt of individual signals from said first and second sensors, said first and third sensors, said first and fourth sensors, said second and fourth sensors, or said third and fourth sensors.

9. The method of claim 6, wherein:

refraining from providing said alarm signal in response to receipt of individual signals from only said second and third sensors.

18. The method of claim 1, wherein:

said first sensing device is attached to said marine vessel with said first field of view directed in a rearward direction toward said region below said deck of said pontoon boat.

10. A method for detecting a heat source proximate a marine vessel, comprising the steps of:

monitoring a first field of view in a first direction from a first sensing device;

providing a first signal when a heat source is within said first field of view;

monitoring a second field of view in a second direction from a second sensing device, said first and second sensing devices being attached to said marine vessel with said first and second fields of view directed in a rearward direction, said first and second fields of view intersecting at a detection zone behind said marine vessel, said first sensing device comprising a first sensor and a second sensor, said second sensing device comprising a third sensor and a fourth sensor;

providing a second signal when a heat source is within said second field of view;

receiving said first and second signals; and

determining the presence or absence of a heat source within said detection zone as a function of both of said first and second signals.

11. The method of claim 10, wherein:

said second sensor is disposed closer to a centerline of said marine vessel than said first sensor and said third sensor being disposed closer to said centerline of said marine vessel than said fourth sensor; and

said first, second, third, and fourth sensors are each configured to provide individual signals representing the detection of said heat source within its individual field of view.

12. The method of claim 11, further comprising:

providing an alarm signal in response to receipt of individual signals from two or more of said first, second, thirds, and fourth sensors.

13. The method of claim 11, further comprising:

providing an alarm signal in response to receipt of individual signals from said first and second sensors, said first and third sensors, said first and fourth sensors, said second and fourth sensors, or said third and fourth sensors.

14. The method of claim 11, wherein:

refraining from providing said alarm signal in response to receipt of individual signals from only said second and third sensors.

15. A method for detecting a heat source proximate a marine vessel, comprising the steps of:

monitoring a first field of view in a first direction from a first sensing device;

providing a first signal when a heat source is within said first field of view, said first field of view being directed toward a region below a deck of a pontoon boat;

receiving said first signal; and

determining the presence or absence of a heat source within a detection zone as a function of said first signal.

16. The method of claim 15, further comprising:

monitoring a second field of view in a second direction from a second sensing device;

providing a second signal when a heat source is within said second field of view, said second field of view being directed toward said region below said deck of said pontoon boat;

receiving said second signal; and

determining the presence or absence of said heat source within said detection zone as a function of both of said first and second signals.

17. The method of claim 15, wherein:

said first sensing device contains a first infrared device.

19. The method of claim 16, further comprising:

providing an alarm signal upon the concurrent occurrence of said first and second signals.

20. The method of claim 16, further comprising:

providing an alarm signal upon the occurrence of either of said first and second signals.