| 摘要 |
A safety for a marine vessel provides an infrared sensor with a tube having a central cavity in order to define a viewing angle which is more narrow than the inherent viewing angle of the infrared sensor. The central cavity of the tube also defines a line of sight that can be directed toward a particular region near a marine vessel that is to be monitored for the presence of a heat generating object, such as a human being. An alarm circuit is responsive to signals from the infrared sensor and deactivates the marine propulsion system when a heat generating object is near the marine propulsion system. The length and diameter of the tube are selected to provide a desired viewing angle for the infrared sensor. An audible alarm output is provided if an attempt is made to manipulate a joystick that controls the marine propulsion system when a heat generating object is sensed by the infrared sensor.
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