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A fiber white-light interference demodulator using two parallel reflection planes

A parallel reflective surface and white light interference technology, which is applied in the direction of transmitting sensing components, instruments, and converting sensor output with optical devices, can solve the problems of limited application, complex structure, and high price

Active Publication Date: 2016-08-10
DALIAN AITELONG OPTICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the demodulation hardware (spectrometer, scanning light source) used in these two technologies includes a large number of high-precision optical components, the structure is complex, and requires precise adjustment, so the price is relatively expensive
At the same time, the matching demodulation algorithm is quite complicated and time-consuming, which greatly limits the application of this technology in industry
In contrast, the hardware of the third method is relatively simple, and the demodulation algorithm is relatively intuitive, but a special high-precision optical wedge is still used in the hardware, the cost is still high, and there is a high cost for its assembly and calibration. requirements, so the overall price of the demodulator is still high, and it has not been widely used in the industry

Method used

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  • A fiber white-light interference demodulator using two parallel reflection planes
  • A fiber white-light interference demodulator using two parallel reflection planes
  • A fiber white-light interference demodulator using two parallel reflection planes

Examples

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specific Embodiment 1

[0023] Specific embodiment 1: Optical fiber F-P temperature / pressure sensing system

[0024] The system schematic diagram of this embodiment is attached image 3 . The entire system uses an all-fiber design. The broadband light source 1 used is a near-infrared SLED, and the optical coupler 3 is a 2×2 fiber optic coupler. The two sensors 5, the broadband light source 1 and the demodulator are incident on the optical fiber coupler. Fiber 7 connection. The measured interference sensors 5 are two F-P structure low-coherence optical fiber sensors, which are optical fiber F-P temperature sensors and optical fiber F-P pressure sensors. The optical path difference of the F-P sensor is respectively finely adjusted to ensure that the interference fringes within the dynamic range are all irradiated on the array detector 11 without overlapping. No lens is used in this system, the parallel optical reflective surfaces 9 are two surfaces of a transparent parallel quartz glass plate, and t...

specific Embodiment 2

[0026] Specific embodiment 2: Michelson displacement measurement system

[0027] The system schematic diagram of this embodiment is attached Figure 4 . The system uses a hybrid design of free space and fiber optics. The Michelson interferometer part is a free space light path, and the demodulator part is a fiber optic light path. Broad-spectrum light source 1 uses near-infrared LEDs. A cylindrical convex lens (as the incident lens 8) is placed between the incident optical fiber 4 and the parallel optical reflection surface 9, such as figure 2As shown, the cylindrical convex lens is placed perpendicular to the incident light, and the cylindrical centerline of the cylindrical lens is in the incident plane (the incident plane refers to the plane formed by the incident beam centerline and the normal line of the reflecting surface), and its focal point is located in the incident optical fiber 4 The end face of the exit end, in order to achieve the collimation of the exit beam ...

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Abstract

The invention discloses a fiber white-light interference demodulator using two parallel reflection planes. The fiber white-light interference demodulator is characterized in that the demodulator comprises a broadband light source. Light emitted by the broadband light source enters one ingoing end of an optical coupler; an outputting end of the optical coupler is connected with a detected optical interference sensor; the other ingoing end of the optical coupler is connected with an ingoing fiber; space light beams, having a certain divergence angle and emitted by the outgoing end of the ingoing fiber, are irradiated to a transparent parallel optical reflection plane pair, and the axis of the outgoing end of the ingoing fiber and the transparent parallel optical reflection plane pair form an included angle of 20-70 degrees; an array light detector is arranged in the refection direction of the transparent parallel optical reflection plane pair; the reflectivity of the two surfaces of the transparent parallel optical reflection plane pair ranges between 3%and 20%; the initial optical path difference of the detected interference sensor is L; and the optical thickness of the transparent parallel optical reflection plane pair is L+ / -0.5L.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber white light interference demodulator using two parallel reflection surfaces. Background technique [0002] Using the interference phenomenon of light to measure distance is a high-precision measurement method that has been widely recognized and used for a long time. In order to achieve this goal, people have designed interferometers with many structures and widely used them in various measurements of physics, biology and astronomy. With the development of optical fiber technology, various interferometers using optical fibers as optical waveguides have made optical interferometry technology find a place to use in various engineering applications. By designing interferometers and sensors with various structures, interferometric optical sensors can convert various physical quantities into lengths and measure them with extremely high precision, includi...

Claims

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Application Information

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IPC IPC(8): G01D5/26
CPCG01D5/266
Inventor 于志浩田志鹏
Owner DALIAN AITELONG OPTICS TECH CO LTD
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