Optical fiber distributed physical quantity measurement method, device and system based on laser tuning control
An optical fiber distribution and tuning control technology, which is applied to measurement devices and uses optical devices to transmit sensing components, instruments, etc., can solve the problem of easy mode hopping, high cost, and inability to meet the spatial resolution requirements of distributed physical quantity measurement systems. and other problems, to achieve the effect of low cost, small size, improved spatial resolution and measurement range
Active Publication Date: 2022-07-01
HARBIN INST OF TECH
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Problems solved by technology
In existing technologies or devices, external cavity tuned lasers or semiconductor lasers are usually used as light sources, but external cavity tuned lasers are expensive and prone to mode hopping
However, semiconductor lasers usually have a sweep frequency range of only tens of GHz (less than 1nm), which cannot meet the spatial resolution requirements of distributed physical quantity measurement systems.
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[0024] figure 1It is a schematic diagram of a typical distributed feedback array laser structure. Usually, the distributed feedback array laser is composed of a piece of integrated multiple laser diodes 38 with different wavelengths and a multi-mode interference coupler 33 for beam combining. At the same time, the substrate 37 of the distributed feedback array laser has a A thermoelectric cooler 35 for heating or cooling controlled by current and a thermistor 36 whose resistance varies with temperature. Take Japan's FITEL company's D66 distributed feedback array laser as an example, 12 laser diodes with a wavelength interval of 3.5nm are integrated on a single chip (https: / / www.furukawa.co.jp / fitel / english / active / pdf / signal / ODC-7AH001H_FRL15TCWx-D66-xxxxx-D.pdf). The output wavelength of the distributed feedback array laser responds to both temperature and current. The usual usage is to use the thermoelectric cooler 35 to adjust the temperature of the laser array to achiev...
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The present application discloses an optical fiber distributed physical quantity measurement method based on laser tuning control, which is used to measure the physical quantity change of the object to be measured through a fiber optic sensor coupled to the object to be measured. The change of the physical quantity is calculated by the main path interference optical signal in the measurement state after the band splicing and the main path interference optical signal in the reference state after the splicing. The present application applies the distributed feedback array laser to the distributed physical quantity measurement device based on the optical frequency domain reflection technology. The method realizes a large-scale wavelength tuning range without mode hopping, and improves the spatial resolution and performance of the distributed measurement method and device. Measurement range. The present application also discloses corresponding devices and systems.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a high-resolution distributed physical quantity measurement method, device and system. Background technique [0002] The distributed physical quantity measurement based on the principle of optical frequency domain reflectometry is a technical means that can realize the distributed measurement of physical quantities. The related earlier documents include: [0003] Distributed measurement of static strain in an optical fiber with multiple Bragg gratings at nominally equal wavelengths[J].Applied Optics,1998,37(10):1741-1746. [0004] High-spatial-resolution distributed strain measurement in opticalfiber with Rayleigh scatter[J].Applied Optics,1998,37(10):1735-1740. [0005] In the distributed physical quantity measurement system based on the principle of optical frequency domain reflectance, tunable laser is used as the system light source, and the spatial...
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IPC IPC(8): G01D5/353
CPCG01D5/35325G01D5/35329G01D5/35393
Inventor 崔继文赵士元谭久彬
Owner HARBIN INST OF TECH