Optional Fiber Gas Sensor System Based on Virtual Instrument

This paper adopted wide band light source form ordinary light emitting diode to get narrow band light source through wavelength modulation by Bragg grating and piezoelectric ceramic.To increase the sensitivity of the optical fiber gas sensor,neural network method was used to adjust the voltage of the piezoelectric ceramic.A data acquisition and analysis system based on the virtual instrument technique was designed.With the powerful digital processing ability of the computer,the signal will be analyzed and displayed in user-friendly interface,and the saved history data can also be used in other related work.