According to the bad conditions such as oil field,coal mine in which the instrument was used and the characteristics of NIRS,improved the traditional lock-in amplifier and designed a new one which was fit for gas detection.

• 由于仪器主要用于油田、煤矿等工作环境相对恶劣的地方,其工作电压不稳定,另外根据近红外光谱的特点,对传统的锁相放大器进行了改进,设计了一种适合瓦斯气体浓度检测中的锁相放大器。