森林或荒地的火一旦已被扑灭,仍然有在还是温暖的地区再次爆发火灾的危险。而这些地区常常是不容易被探测到的。加拿大和瑞典所用的一种系统采用了直升飞机装载的红外探测仪器,所有热源在该仪器的萤光屏上显示为明亮区。飞行高度范围是在300到1000呎之间,飞机按纵和横两个方向飞行以探测隐藏在障碍物后面的热点。然后围绕可疑区上方飞行,逐渐缩小盘旋范围以进行更详细的研究。这 Once a forest or wasteland fire has been extinguished, there is still the danger of another fire outbreak in warmer or warmer areas. These areas are often not easily detected. One system used in Canada and Sweden uses a helicopter-mounted infrared detector, all of which are shown on the instrument’s bright screen as bright areas. The flight altitude ranged from 300 to 1000 feet. The aircraft flew in both vertical and horizontal directions to detect hot spots hidden behind obstacles. Then fly around the suspect area, gradually narrowing the hovering range for more detailed research. This