SENSOR BASED ON LASER

摘要

The present invention is suitable for the technical field of sensing, and provides an sensor based on laser, comprising a pump source, a common section, a reference section and a detection section, the common section is provided with a gain medium, and the detection section is provided with a sensing element capable of causing an optical path difference; the reference section and the detection section is connected to the common section though a first polarization splitting unit and a second polarization splitting unit; the common section is provided with an output unit or each of the reference section and the detection is provided with the output unit, the output unit is connected to a photoelectric detector through a light uniting unit; a polarization rotation unit is disposed between the light uniting unit and the output unit. In the present invention, a heterodyne interference is generated by the two lasers with different frequency, the amounts of physical quantities are determined by detecting the frequency difference; and because the frequencies of the laser oscillations are sensitive to the changes of the optical paths in the resonators, the sensitivity and accuracy of the sensor are high, and the two resonators of the sensor have common optical path, such that the sensor has good anti-jamming capacity and is suitable for measuring the small changes in a variety of physical quantities.

主权项

1. A sensor based on laser, comprising a pump source, a common section, and a reference section and a detection section which are connected to the two ends of the common section in parallel, wherein the common section is provided with a gain medium, and the detection section is provided with a sensing element capable of causing an optical path difference;
wherein one end of each of the reference section and the detection section is connected to the common section though a first polarization splitting unit, another end of each of the reference section and the detection section is connected to the common section though a second polarization splitting unit; the common section and the reference section constitute a first laser resonator transmitting a first linearly polarized light, and the common section and the detection section constitute a second laser resonator transmitting a second linearly polarized light; the common section is provided with an output unit or each of the reference section and the detection section is provided with the output unit, the output unit is connected to a photoelectric detector through a light uniting unit, lasers are output from the output unit, and are united and transmitted to the photoelectric detector; a polarization rotation unit configured for the consistency of the polarization states of the first linearly polarized light and the second linearly polarized light, is disposed between the light uniting unit and the output unit.