Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios

Abstract

The invention provides a quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios. The quasi-distributed white light interference strain sensing system comprises a wide-spectrum light source, an optical fiber circulator, a connection optical fiber, a 2*2 optical fiber coupler, a fixed-length optical fiber part and an adjustable-length optical fiber part of a fixed reference arm, the optical fiber full-spectrum reflectors with adjustable splitting ratios, an adjustable reference arm, a self-focusing optical fiber collimating mirror, a movable mirror, a stepper motor, a photoelectric detector, a data acquiring card and a computer, wherein a guide optical fiber is an optical fiber for connecting a main part with a sensor; the length difference from the guide optical fiber to a sensing optical fiber is over certain centimeters; the sensor consists of the two optical fiber full-spectrum reflectors withadjustable splitting ratios and the sensing optical fiber; and a plurality of sensors can be cascaded to form a distributed sensor, so that multi-point distributed measurement can be realized. The quasi-distributed white light interference strain sensing system has a stable structure, high environmental suitability and high portability and is suitable for engineering; and good control over the splitting ratios of transmitted light and reflected light is realized.

Description

technical field [0001] The invention relates to a micron deformation measurement sensor, which is a quasi-distribution white light interference strain sensor based on an optical fiber full-spectrum reflector with an adjustable split ratio and a measurement system thereof. Background technique [0002] The traditional optical fiber full-spectrum reflector is a kind of chrome film or aluminum film on the front end of the cut flat optical fiber, and then it is tightly matched with another flat optical fiber end face in the same glass sleeve. The air gap formed between them is used to adjust the splitting ratio of reflected light and transmitted light, also known as splitting ratio. Although the full-spectrum reflector constructed in this way can divide the incident light into reflected light and transmitted light according to a certain ratio, it is difficult to achieve fine control of the splitting ratio. Because the air gap is easily affected by ambient temperature, humidity,...

AI Technical Summary

Problems solved by technology

Although the full-spectrum reflector constructed in this way can divide the incident light into reflected light and transmitted light according to a certain ratio, it is difficult to achieve fine control of the splitting ratio.

Because the air gap is easily affected by ambient temperature, humidity, etc., which in turn affects its splitting ratio

The fiber optic full-spectrum reflector produced by this method has the disadvantages of complex fabrication, unstable performance, and difficult engineering use, so it has not been able to be applied in practice.

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