As an OP-FTIR(Open Path FTIR) technology,passive OP-FTIR not only has the advantages of OP-FTIR,but also has the ability to collect data from any direction without prior background information.

• 被动式OP-FTIR是一种开路FTIR技术,它具有OP-FTIR的所有优点,而且在缺乏背景信息的情况下,有对准任意方向收集数据的能力,是一种可移动、快速的遥测手段。