| 摘要 |
A modular apparatus provides a multipoint optical gas sensing network. The apparatus comprises a tunable laser diode 220 as optical source, a control unit 210 for generating a control signal for modulating a drive signal for the laser, at least one optical beam splitter 230 for receiving the laser beam and splitting it into a plurality of output beams, a gas sensor interface having a plurality of output ports to direct the beams to a plurality of gas sensor cells 250 via respective waveguides, at least one photo-receiver module 240 with at least one photodetector 241 and a signal processor 245, the gas sensor interface having a plurality of input ports to direct beams from the cells to the corresponding photodetectors, wherein the processor 245 for each receiver module 240 determines the concentration of target gas in each cell from the input beam detected at each photodetector. |
