MULTICOMPONENT FIBEROPTIC GAS SENSOR-BASED ON MIR TUNABLE DIODE-LASERS

The presented multichannel system is intended for simultaneous analysi s of several components of a gas mixture by using a set of tunable dio de lasers (TDL). The design and schematic solution of the sensor is ba sed on the integration of MIR fibers with TDLs and photodetectors kept cold at temperatures from 80 to 120 K. Optical fibers are used in the system for transmitting radiation from the lasers to the multipass an alytical cell and then to the IR detectors. The key components of the system are: MBE lead salt heterolasers for the spectral range 3 to 16 mu m, A3B5 heterolasers for the spectral range 0.75 to 3.6 mu m, polyc rystalline fibers from silver halides for the spectral range 4 to 16 m u m, chalcogenide glass fibers for the spectral range 1 to 7 mu m, and super dry silica fibers for the near IR region 0.75 to 2.5 mu m The p resented solution gives a set of new advantages and capabilities: simp licity and dependability of cryogenic systems; ability of using IR las er radiation in areas difficult to access; ability to remote measureme nts in extreme sterile and clean conditions; correcting for adsorption signal of atmospheric air as a contaminant in analysis; smaller in si ze and lighter multichannel TDL systems.