Synchronous detection system for NH3 and NO at SCR denitration outlet

The utility model discloses a system for synchronously detecting NH3 and NO at an SCR (Selective Catalytic Reduction) denitration outlet. The system comprises an on-site measuring device, the field measurement device comprises a laser emitting and receiving unit, an absorption cell unit and a data acquisition and processing unit, the laser transmitting and receiving unit comprises a first laser controller, a DFB laser, a second laser controller, a QCL laser, a collimator, a first detector and a second detector; the absorption cell unit comprises an absorption cell, a thermocouple, a temperature recorder, a flow display and a vacuum pump; the data acquisition and processing unit comprises a data acquisition card and an upper computer. According to the utility model, the laser sources with different wavelengths are combined with the absorption cell shared by the long and short optical paths, so that the rapid, accurate and synchronous detection of NH3 and NO is realized. The SCR denitration device can be widely