Measurement of small-signal gain on solid propellant combustion driven CO2 gasdynamic laser

An introduction is given to the principle, method and experiment system of measurement of small-signal gain on solid propellant combustion driven CO2 gasdynamic laser. Measure optical path design of small-signal gain, operating principle of thermistor infrared detector, design of filter and amplifier circuit of gain output signal and hardware configuration as well as rules and methods of software development of data acquisiti on system are mainly presented. The typical experimental results are also given, which show that the amplification method can measure the smallsignal gain accurately.