Thermal Imagers In Rural and Urban Rescue

On Dec. 30, 2007, shortly before 6 P.M., Bonner Springs Police were dispatched on a report of a suicidal man who had cut himself with a knife and left the residence. When officers arrived on the scene, they discovered blood on the floor in the residence...


On Dec. 30, 2007, shortly before 6 P.M., Bonner Springs Police were dispatched on a report of a suicidal man who had cut himself with a knife and left the residence. When officers arrived on the scene, they discovered blood on the floor in the residence and a note the man had left stating he was...


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On Dec. 30, 2007, shortly before 6 P.M., Bonner Springs Police were dispatched on a report of a suicidal man who had cut himself with a knife and left the residence. When officers arrived on the scene, they discovered blood on the floor in the residence and a note the man had left stating he was going to kill himself. It was after dark and below freezing outside. Concerned for the man's safety, the officers used their flashlights to search a wooded park near the residence. After an unsuccessful search by flashlight, the officers requested a thermal imager (TI). Once the thermal imager was on-scene, the officers started searching again. Within five minutes of searching, officers had located a heat source within the park about 200 yards away. As the officers walked closer to the heat source, they discovered it was the suicidal man they had been looking for. The victim was lying in a thicket of grass at the base of a tree. His right wrist was deeply cut and bleeding severely. Officers assisted the man out of the park where he was treated by an ambulance crew.

Given the severity of the bleeding and the cold temperatures, the thermal imager was likely the difference between life and death for the victim, who went on to recover from his wounds. The officers involved in the search agree that the victim would not have been located if they had been forced to use only flashlights.

Lost or Missing Persons

Two major benefits of TIs in this type of situation are that the technology offers first responders the ability to see in otherwise poor visibility and it allows them to see signs hidden from regular human sight. Although this case involved a police department, many fire departments encounter rescue situations that can be positively impacted by the timely and effective use of a TI.

Both urban and rural rescuers can be called upon to locate lost or missing persons. The two most common missing person searches are based on the lost/runaway child or the walked-away senior citizen who may be afflicted by Alzheimer's, dementia or other organic brain syndrome. Disoriented hikers, hunters and other outdoors enthusiasts are also at risk of becoming lost and in need of rescue.

Whether lost in a park or in a cornfield, a person's heat signature can travel a greater distance than a rescuer's light. In areas with dense growth near the ground, rescuers will benefit from an elevated viewing position, accomplished with an aerial ladder or a nearby structure. Rain and snow can interfere with a person's heat signature. As rain cools the person's clothing or as snow builds up on the exterior, less of the person's body heat will emit toward the TI. This will reduce the range and effectiveness of the TI.

Alzheimer's patients can be a frequent urban search issue. While an adult search-and-rescue scenario may be similar to that of a child, adults are more likely to take protective measures, perhaps covering themselves to retain heat or seek protection from rain. As a result, they will unintentionally block more of their heat signature from reaching the rescuer's TI.

Rescuers should be looking for the obvious as well as the subtle heat signatures that seem out of place. Obvious heat sources are usually easy to spot and stand out against the background. As indicated in the story out of Bonner Springs, what the officers originally noticed was a heat signature that did not seem to fit in with the surroundings. They could not readily identify it from their position, but they investigated and located their victim.

More subtle heat sources may require a more discerning eye. This can involve a rock or log with a visible heat pattern or anomaly. Such an anomaly could indicate where your victim sat to rest indicating that you are heading in the right direction.

Law Enforcement Imagers

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