Constant temperature trough in the distributed optical fiber temperature sensor system application, the system by a laser diode (
LD)
And drive (
司机)
, photoelectric detector (
APD)
And the amplifier components (
AMP)
, optical fiber sensing circuit (
OFL)
And the signal processing circuit, computer, etc.
in order to ensure the stability of laser diode power and peak wavelength, the semiconductor work in cold thermostatic bath at low temperature cooling.
Laser pulse through the coupler incident to the optical fiber sensing circuit, and the optical fiber sensing circuit of backscattering echo back, by wavelength identify module into stokes channel and antistokes channel;
Photoelectric detector components for high sensitivity, low noise silicon avalanche diode components (
APD)
, in order to ensure the stability of APD work, make its work in low temperature constant temperature tank cooling.
The signal processing circuit is composed of high speed transient averager and accumulator, computer is mainly used for temperature signal demodulation and signal processing, display.
According to the needs of users, design software and interface.
