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Reflection-type interference optical fiber sensor system

An optical fiber sensor and interference type technology, which is applied in the direction of using optical devices to transmit sensing components, and can solve problems such as service life impact and poor sensing accuracy.

Inactive Publication Date: 2012-07-25
扬州永扬科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Especially for phase modulation fiber optic sensors, the optoelectronic modules in phase modulation fiber optic sensors are easily disturbed by external factors such as temperature, vibration, pressure, etc., resulting in poor sensing accuracy and affected service life

Method used

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  • Reflection-type interference optical fiber sensor system
  • Reflection-type interference optical fiber sensor system
  • Reflection-type interference optical fiber sensor system

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Embodiment Construction

[0026] figure 1 It is a schematic diagram of an embodiment of the reflective phase modulation optical fiber sensor involved in the present invention. According to this embodiment, the optical fiber sensor includes a light source, a first light splitting and combining device (i.e. figure 1 The light-splitting and combining device 1), the Y-type optical phase modulator, the second light-splitting and combining device (ie figure 1 Light-splitting and synthesizing devices 2), optical retarder, photodetector, amplification filter unit, analog-to-digital conversion unit, digital demodulation unit, integral unit, digital accumulation unit, digital-to-analog conversion and drive unit, numerical filter unit, interface conversion unit.

[0027] Since the sensor designed in the present invention can be used as a general sensor, the probe therein is used to detect the measurement to be measured, and the composition of the probe can be determined according to the specific type of measure...

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PUM

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Abstract

The invention provides a general scheme of a reflection-type interference optical fiber sensor system. The reflection-type interference optical fiber sensor system comprises a light source, a photoelectric detector, an optical element integrated component, a probe and a digital closed ring signal processing unit based on relevant modulation-demodulation, wherein the optical element integrated component consists of a first light-splitting and light-integrating element, a Y-type optical phase modulator, a second light-splitting and light-integrating element and an optical delayer, and the functions of the optical element integrated component comprises light splitting, light integrating, light polarizing, polarized light decomposing and optical phase modulating. The general scheme of the optical fiber sensor adopts a reciprocity light path, so that the anti-interference capability of the sensor to environmental factors of temperature, vibration and the like is improved. The general scheme adopts a digital closed ring weak signal detection method by combining square wave bias modulation with step wave feedback modulation, so that the sensor can detect a physical quantity to be detected in a high-linearity and high-accuracy way.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to a reflective interference type optical fiber sensor. Background technique [0002] In the past 30 years, fiber optic sensor technology has developed rapidly, and now it is an important field of sensing technology, and its development directly affects the progress of many industries. Compared with traditional sensors, the characteristics of optical fiber sensors mainly include: (1) anti-electromagnetic interference, electrical insulation, corrosion resistance, and intrinsic safety; (2) high sensitivity; (3) light weight, small size, and variable shape; ( 4) Wide range of measurement objects; (5) Little impact on the measured medium; (6) Easy to reuse and easy to form a network; (7) Low cost and so on. [0003] Due to the above advantages, optical fiber sensor technology has a wide range of applications or application prospects in many fields such as electric power, petrochemical, biomed...

Claims

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Application Information

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IPC IPC(8): G01D5/353
Inventor 石金华
Owner 扬州永扬科技有限公司
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