The invention discloses a
laser type remote PH (potential of
hydrogen) value monitoring device. The
laser type remote PH value monitoring device comprises a narrow-linewidth
laser device, a 3dB coupler, transmission optical fibers, a sensing head, a liquid carrying tank and an
optical power meter. The 3dB coupler comprises a port A, a port B, a port C and a port D, an output end of the narrow-linewidth laser device is connected with the port A of the 3dB coupler, the sensing head comprises a D-shaped
optical fiber and a
polarization maintaining optical fiber, the port B is connected with the D-shaped
optical fiber of the sensing head by the corresponding transmission
optical fiber, the port D is connected with the
polarization maintaining optical fiber by the corresponding transmission optical
fiber, and the port C is connected with the
optical power meter. The laser type remote PH value monitoring device has the
advantage that the technical problems of complicated structure of PH value monitoring equipment and incapability of remotely
monitoring PH values over long distances in real time can be solved by the aid of the laser type remote PH value monitoring device.