The working principle, characteristics and types of on-line tunable diode laser spectral analyzer are described. Its development prospect is discussed.

• 摘要介绍了可调谐激光二极管激光光谱分析器的工作原理、性能特点和结构形式，说明了该仪器在在线过程分析中的优势，对其发展远景作了讨论。