Broad-band light source signal detection method and its detector

Abstract

The method for detecting wideband light source signal includes the following steps: 1. laying the polarization-protecting optical fibre on the tested body; 2. one end of the polarization-protecting optical fibre is inputted into wideband detection light source; 3. using polarizing spectroscopic system to divide the wideband detection light source outputted by another end of the polarization-protecting optical fibre into linear polarized light, reflecting and transmission, feeding the linear polarized light into Michelson interferometer; and 4. making the interference light signal undergo the processes of collection, photoelectric conversion, A / D conversion, etc. to output the detection parameters of said tested body. Said invented detector is formed from detection light source system.

Description

technical field [0001] The invention belongs to the category of optical measuring instruments, in particular to an instrument for broadband light source transmission detection. Background technique [0002] At present, in the transmission of broadband light sources, when linearly polarized light is incident along a characteristic axis (fast axis or slow axis) of a polarization-maintaining fiber, the optical signal will propagate along this axis and will not be coupled to another characteristic axis. Due to the influence of environmental factors, such as pressure, tension, torsion, temperature and other factors, the optical signal will be coupled from one characteristic axis to another characteristic axis. Therefore, by detecting the relative intensity of the optical signal coupled at each point in the optical fiber, it can be used to detect the force on the point or the change of the ambient temperature. [0003] U.S. Patent No. US5555086...

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Problems solved by technology

[0003] U.S. Patent No. US5555086 discloses a separate optical fiber sensor using phase modulation technology to detect the relative strength of the optical signal coupled at each point when the broadband light source is transmitted in the optical fiber, but its structure is complex, modulation and demodulation and related Signal processing can significantly increase the cost of the sensor

[0004] U.S. Patent No. US5094534 also discloses a total reflection structure and a coherent selective optical fiber sensor to detect the relative intensity of the optical signal coupled at each point when the broadband light source is transmitted in the optical fiber, but it does not have the ability to detect the signal Distributed monitoring function

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