Optical fibre Sagnac loop dynamic weighing sensor

Abstract

The invention relates to a fiber Sagner loop dynamic weighing sensor. In the sensor, a tail fiber of a light source module is connected with a first port of a fiber circulator; a second port of the fiber circulator is connected with a first port of a fiber coupler; a third port and a fourth port of the fiber coupler are connected to form a loop circuit by fibers; a fiber polarization controller, a fiber protection and enhancement sensing head and a piezoceramics actuator are connected in series to the loop circuit; a third port of the fiber circulator is connected with an input terminal of a first photodetection unit; a second port of the fiber coupler is connected with an input terminal of a second photodetection unit; an output terminal of the first photodetection unit is connected with a data acquisition card; an output terminal of the second photodetection unit is connected with the data acquisition card; the data acquisition card is connected with an input terminal of the piezoceramics actuator to form a feedback loop and connected with a signal processing and displaying system. The fiber Sagner loop dynamic weighing sensor has the characteristics of strong environmental intrusion resisting capacity, high measuring precision and accuracy and wide measuring scope.

Description

technical field [0001] The invention relates to an optical fiber dynamic weighing sensor, in particular to an optical fiber Sagnac ring (hereinafter referred to as Sagnac ring) dynamic weighing sensor. Background technique [0002] In recent years, the phenomenon of over-limit and overloading of road transport vehicles in our country is very common. In severe areas, almost all freight vehicles have over-limit and overloading behaviors to varying degrees. The over-limit and overloaded transportation of vehicles has caused great harm to traffic safety, transportation market, vehicle production order and road and bridge infrastructure. [0003] At present, there are two main types of road vehicle weighing: static weighing and dynamic weighing. Static weighing means that road management personnel let suspected overweight vehicles enter a fixed weighing station for weighing. This is the most accurate method for vehicle weighing, but this method is inefficient and easy to cause t...

AI Technical Summary

Problems solved by technology

my country’s dynamic weighing of vehicles started relatively late, starting in the early 1980s, and the research institute was earlier in Chongqing Highway Research Institute. At present, there are more than 20 related units in China engaged in research in this area. Since the systems developed in China are all Traditional dynamic weighing technology is adopted, so there are inherent defects: slow test response, low test accuracy and huge sensing mechanism, etc.

The disadvantage of this technology is that it needs a good wavelength demodulation technology, the system cost is high, and it is necessary to minimize the influence of the temperature-sensitive characteristics of the fiber Bragg grating on the dynamic pressure measurement.

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